Skocz do pozycji: 1.

Tytuł:

Structure of AlSi20 Alloy in Heat Treated Die Casting

Autorzy:

Władysiak, R.
Kozuń, A.

Powiązania:

https://bibliotekanauki.pl/articles/382310.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

innovative foundry technology
innovative foundry material
die casting
water mist cooling
hypereutectic silumin
microstructure
innowacyjna technologia odlewnicza
innowacyjny materiał odlewniczy
odlewanie ciśnieniowe
chłodzenie mgłą wodną
silumin nadeutektyczny
mikrostruktura

Opis:

The work is a continuation of research on the use of water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation on crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled a with water mist stream. The study was conducted for unmodified AlSi20 alloy and a modified one with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream and solution heat treatment allows in wide range for the formation of the microstructure of hypereutectic silumins. It leads to the growth of microstructure refinement and spheroidizing of phases in the casting.

Źródło:

Archives of Foundry Engineering; 2015, 15, 1; 113-118
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Primary Structure and Mechanical Properties of AlSi2 Alloy Continuous Ingots

Autorzy:

Wróbel, T.
Szajnar, J.
Bartocha, D.
Stawarz, M.

Powiązania:

https://bibliotekanauki.pl/articles/381796.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

continuous casting
aluminum
silicon
inoculation
electromagnetic stirring
odlewanie ciągłe
aluminium
krzem
wszczepianie

Opis:

The paper presents the research results of horizontal continuous casting of ingots of aluminium alloy containing 2% wt. silicon (AlSi2). Together with the casting velocity (velocity of ingot movement) we considered the influence of electromagnetic stirring in the area of the continuous casting mould on refinement of the ingot’s primary structure and their selected mechanical properties, i.e. tensile strength, yield strength, hardness and elongation. The effect of primary structure refinement and mechanical properties obtained by electromagnetic stirring was compared with refinement obtained by using traditional inoculation, which consists in introducing additives, i.e. Ti, B and Sr, to the metal bath. On the basis of the obtained results we confirmed that inoculation done by electromagnetic stirring in the range of the continuous casting mould guarantees improved mechanical properties and also decreases the negative influence of casting velocity, thus increasing the structure of AlSi2 continuous ingots.

Źródło:

Archives of Foundry Engineering; 2017, 17, 2; 145-150
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

SEM/TEM Investigation of Degradation of Bi-Layer (Cr,Al)N/Cr2N3 Duplex Coatings Exposed to AlSi Alloy High Pressure Die Casting Cycles

Autorzy:

Wilczek, A.
Morgiel, Jerzy
Sypień, Anna
Pomorska, Małgorzata
Rogal, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/2174589.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

duplex coatings
CrN/Cr2N/(CrN/CrAIN)/CrAlN
SEM
TEM
HPDC

Opis:

High pressure die casting (HDPC) allows to produce aluminum parts for car industry of complicated shapes in long series. Dies used in this process must be robust enough to withstand long term injection cycling with liquid aluminum alloys, as otherwise their defects are imprinted on the product making them unacceptable. It is expected that nitriding followed by coating deposition (duplex treatment) should protect them in best way and increase intervals between the cleaning/repairing operations. The present experiment covered investigations of the microstructure of the as nitride and deposited with CrAlN coating as well as its shape after foundry tests. The observations were performed with the scanning and transmission electron microscopy (SEM/TEM) method. They showed that the bottom part of this bi-layer is formed by roughly equi-axed Cr2N crystallites, while the upper one with the fine columnar (CrAl)N crystallites. This bi-layers were matched with a set of 7x nano-layers of CrN/(CrAl)N, while at the coating bottom a CrN buffer layer was placed. The foundry run for up to 19 500 cycles denuded most of coated area exposed to fast liquid flow (40 m/s) but left most of bottom part of the coating in the areas exposed to slower flow (7 m/s). The acquired data indicated that the main weakness of this coating was in its porosity present both at the columnar grain boundaries (upper layer) as well as at the bottom of droplets imbedded in it (both layers). They nucleate cracks propagating perpendicularly and the latter at an angle or even parallel to the substrate. The most crack resistant part of the coating turned-out the bottom layer built of roughly equiaxed fine Cr2N crystallites. Even application of this relatively simple duplex protection in the form of CrAlN coating deposited on the nitride substrate helped to extend the die run in the foundry by more than three times.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 4; 1341--1348
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Evaluating the Attenuation in Ultrasonic Testing of Castings

Autorzy:

Boháčik, M.
Mičian, M.
Sládek, A.

Powiązania:

https://bibliotekanauki.pl/articles/383170.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

AlSi alloy
cast iron
technological casting parameters
ultrasound attenuation
stop AlSi
żeliwo
parametry technologiczne
tłumienie fal ultradźwiękowych

Opis:

This paper considers the assessment of attenuation in aluminium alloys castings and in cast iron prepared by gravity casting method and by casting under pressure. The issue of ultrasound attenuation is important in setting the conditions of non-destructive (NDT) testing, especially in casted materials. The characteristics of the ultrasonic technique and ultrasonic attenuation and the calculation of the attenuation and the velocity of ultrasound are presented in the theoretical part of this paper. For experimental measurements, cylindrical castings from AlSi alloy (a hypoeutectic alloy with a silicon content of about 7% - AlSi7 and a eutectic alloy with a silicon content of about 12% - AlSi12) and from grey and ductile cast iron were made. The ultrasonic records of the casting control, the calculation of ultrasound attenuation for individual samples are listed and described in the experimental part. The evaluation of measurements and comparison of calculated ultrasound attenuation is at the end of this article.

Źródło:

Archives of Foundry Engineering; 2018, 18, 2; 151-156
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Statistical analysis using multiple regression of stereological parameters for skeleton castings microstructure

Autorzy:

Cholewa, M.
Dziuba-Kałuża, M.

Powiązania:

https://bibliotekanauki.pl/articles/382076.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

AlSi alloy
microstructural analysis
statistical analysis
skeleton casting
stop Al-Si
analiza mikrostrukturalna
analiza statystyczna
odlew szkieletowy

Opis:

In this article authors showed influence of technological parameters and modification treatment on structural properties for closed skeleton castings. Approach obtained maximal refinement of structure and minimal structure diversification. Skeleton castings were manufactured in accordance with elaborated production technology. Experimental castings were manufactured in variables technological conditions: range of pouring temperature 953÷1013 K , temperature of mould 293÷373 K and height of gating system above casting level 105÷175 mm. Analysis of metallographic specimens and quantitative analysis of silicon crystals and secondary dendrite-arm spacing analysis of solution α were performed. Average values of stereological parameters for all castings were determined. (B/L) and (P/A) factors were determined. On basis results of microstructural analysis authors compares research of samples. The aim of analysis was selected samples on least diversification of refinement degree of structure and least silicon crystals. On basis microstructural analysis authors state that samples 5 (AlSi11, T_pour 1013K, T_mould 333K, h – 265 mm) has the best structural properties (least diversification of refinement degree of structure and the least refinement of silicon crystals). Then statistical analysis results of structural analysis was obtained. On basis statistical analysis autors state that the best structural properties for technological parameters: T_pour = 1013 K, T_mould = 373 K and h = 230 mm [4]. The results of statistical analysis are the prerequisite for optimization studies.

Źródło:

Archives of Foundry Engineering; 2011, 11, 3 spec.; 43-48
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Influence of Iron in AlSi10MgMn Alloy

Autorzy:

Žihalová, M.
Bolibruchová, D.

Powiązania:

https://bibliotekanauki.pl/articles/382235.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

alloy AlSi10MgMn
intermetallic phase
bronze
stop AlSi10MgMn
faza międzymetaliczna
brąz

Opis:

Presence of iron in Al-Si cast alloys is common problem mainly in secondary (recycled) aluminium alloys. Better understanding of iron influence in this kind of alloys can lead to reduction of final castings cost. Presented article deals with examination of detrimental iron effect in AlSi10MgMn cast alloy. Microstructural analysis and ultimate tensile strength testing were used to consider influence of iron to microstructure and mechanical properties of selected alloy.

Źródło:

Archives of Foundry Engineering; 2014, 14, 4; 109-112
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Effect of Technological Parameters on the AlSi12 Alloy Microstructure During Crystallization Under Pressure

Autorzy:

Pastirčák, R.

Powiązania:

https://bibliotekanauki.pl/articles/380406.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

squeeze casting
heat transfer
pressure
aluminium alloy
wyciskanie
wymiana ciepła
nacisk
stop aluminium

Opis:

The paper deals with the impact of technological parameters on the heat transfer coefficient and microstructure in AlSi12 alloy using squeeze casting technology. The casting with crystallization under pressure was used, specifically direct squeeze casting method. The goal was to affect crystallization by pressure with a value 100 and 150 MPa. The pressure applied to the melt causes a significant increase of the coefficient of heat transfer between the melt and the mold. There is an increase in heat flow by approximately 50% and the heat transfer coefficient of up to 100 fold, depending on the casting conditions. The change in cooling rate influences the morphology of the silicon particles and intermetallic phases. A change of excluded needles to a rod-shaped geometries with significantly shorter length occurs when used gravity casting method. By using the pressure of 150 MPa during the crystallization process, in the structure can be observed an irregular silica particles, but the size does not exceed 25 microns.

Źródło:

Archives of Foundry Engineering; 2017, 17, 2; 75-78
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

The Effects of Pressure During the Crystallization on Properties of the AlSi12 Alloy

Autorzy:

Pastirčák, R.
Ščury, J.
Moravec, J.

Powiązania:

https://bibliotekanauki.pl/articles/380626.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

squeeze casting
pressure
aluminium alloy
mechanical properties
microstructure
metoda prasowania stopu
nacisk
stop aluminium
właściwości mechaniczne
mikrostruktura

Opis:

The paper deals with the impact of technological parameters on the mechanical properties and microstructure in AlSi12 alloy using squeeze casting technology. The casting with crystallization under pressure was used, specifically direct squeeze casting method. The goal was to affect crystallization by pressure with a value 100 and 150 MPa. From the experiments we can conclude that operating pressure of 100 MPa is sufficient to influence the structural characteristics of the alloy AlSi12. The change in cooling rate influences the morphology of the silicon particles and intermetallic phases. A change of excluded needles to a rod-shaped geometries with significantly shorter length occurs when used gravity casting method. At a pressure of 100 MPa was increased of tensile strength on average of 20%. At a pressure of 150 MPa was increased of tensile strength on average of 30%. During the experiment it was also observed, that increasing difference between the casting temperature and the mold temperature leads to increase of mechanical properties.

Źródło:

Archives of Foundry Engineering; 2017, 17, 3; 103-106
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:

Influence of Casting Wall Thickness on Crystallisation Under Pressure

Autorzy:

Pastirčák, R.
Ščury, J.
Brůna, M.
Bolibruchová, D.
Jakubski, J.

Powiązania:

https://bibliotekanauki.pl/articles/353947.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

squeeze casting
AlSi7Mg0.3 alloy
AlSi12 alloy
pressure
wall thickness

Opis:

The paper deals with squeeze casting technology. For this research a direct squeeze casting method has been chosen. The influence of process parameters variation (casting temperature, mold temperature, pressure) on mechanical properties and structure will be observed. The thicknesses of the individual walls were selected based on the use of preferred numbers and series of preferred numbers (STN ISO 17) with the sequence of 3.15, 4.00, 5.00, 6.00 and 8.00 mm. The width of each wall was 22 mm with a length of 100 mm. As an experimental material was chosen the AlSi12 and AlSi7Mg0.3 alloys. The mechanical properties (UTS, E) for individual casting parameters and their individual areas of different thicknesses were evaluated. In the structure the influence of pressure on the change of the eutectic morphology, the change of the volume of eutectic and the primary alpha phase, the effect of the pressure on the more fine-grain and the regularization of the structure were evaluated.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1889-1893
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

The influence of material of mould and modification on the structure of AlSi11 alloy

Autorzy:

Łągiewka, M.
Konopka, Z.

Powiązania:

https://bibliotekanauki.pl/articles/382435.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metalografia
stop aluminium
modyfikacja
struktura stopu
forma odlewnicza
metallography
aluminum alloy
modification
structure
foundry mould

Opis:

The presented work discusses the influence of material of foundry mould on the effect of modification of AlSi11 alloy. For this purpose castings were produced in moulds made of four various materials. Castings of the first type were cast in a metal die, the second ones in the conventional mould of bentonite-bound sand, those of the third type in the sand mould with oil binder, the last ones in a shell mould where phenol-formaldehyde resin was applied as a binder. All the castings were made of AlSi11 alloy modified with strontium. For a purpose of comparison also castings made of the non-modified alloy were produced. The castings were examined with regard to their microstructures. The performed investigations point out that the addition of strontium master alloy results in refining of the alloy structure, particularly of the \alfa-phase, causes some morphological changes in the alloy and the refinement of eutectics. The advantageous influence of modifier on the structure of the examined silumin was observed particularly in the case of alloy cast either in the conventional oil-bound sand mould or in the shell mould. The non-modified alloy cast into a metal die exhibits a structure similar to those of modified alloy solidifying in the other moulds. The improvement in both tensile strength and unit elongation suggests that the modification was carried out correctly. The best mechanical properties were found for the alloy cast in a metal die, both with and without modification treatment.

Źródło:

Archives of Foundry Engineering; 2012, 12, 1; 67-70
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:

Fatigue Properties of AlSi7Mg Alloy with Diversified Microstructure

Autorzy:

Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, A.

Powiązania:

https://bibliotekanauki.pl/articles/380962.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

AlSi7Mg03 alloy
alloy refining
alloy modification
cooling rate
microstructure parameter
fatigue strength
stop AlSi7Mg03
rafinacja stopu
modyfikacja stopu
szybkość chłodzenia
parametr mikrostrukturalny
wytrzymałość zmęczeniowa

Opis:

The paper discusses the effect of microstructure on the fatigue strength of AlSi7Mg casting alloy refined conventionally with hexachloroethane without modifying and modified with TiB and Na. Castings made of both alloy variants were subjected to T6 heat treatment. It turned out that the applied refining secured satisfactory compactness of the material. In view of absence of gas and shrinkage porosity in the castings, short cracks nucleated on largest silicon precipitates and largest intermetallic phase precipitations as these were the locations where stress concentrations reached their highest values. Comprehensive modification of the alloy resulted in reduction of the value of SDAS parameter characterizing α(Al) phase dendrites, a decrease of the distance between silicone precipitates in the eutectic λ_E, and a decrease of the maximum size of silicone precipitates l_maxSi. The ultimate effect of these changes was an increase of the fatigue strength.

Źródło:

Archives of Foundry Engineering; 2015, 15, 3 spec.; 87-90
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:

Influence of vibrations during crystallization on mechanical properties and porosity of EN AC-AlSi17 alloy

Autorzy:

Ciućka, T.

Powiązania:

https://bibliotekanauki.pl/articles/382352.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

fundamentals of foundry processes
crystallization
structural constituent
porosity
ATD
proces odlewniczy
krystalizacja
składnik strukturalny
porowatość
metoda ATD

Opis:

Today’s industry aims at such situation, where number of defective products, so called defects shall approach to zero. Therefore, one introduces a various changes in technology of production, introduces improvements which would help in accomplishment of this objective. Another important factor is introduction of different type of testing, which shall help in assessment which factor has significant effect on quantity of rejects, and which one could be neglected. Existence of casting rejects is unavoidable; therefore a new ideas, technologies and innovations are necessary in the entire widely understood foundry branch, in order to minimize such adverse effect. Performance of tests aimed at unequivocal determination of an effect of vibrations during crystallization on mechanical properties and porosity of the EN AC-AlSi17 alloy was the objective of the present work. To do this, there were produced 36 castings from EN AC-AlSi17 alloy. All the castings underwent machining operations. Half of the casting was destined to strength tests, the other half served to determination of an effect of vibrations on porosity of the alloy. The specimens were divided into 12 groups, depending on amplitude of vibrations and tilt angle of metal mould during pouring operation.

Źródło:

Archives of Foundry Engineering; 2013, 13, 1; 5-8
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Analyses of calcium influence on the AlSi9CuMnNi alloy

Autorzy:

Náprstková, Nataša
Kraus, Pavel
Cais, Jaromír
Stančeková, Dana
Miturska, Izabela

Powiązania:

https://bibliotekanauki.pl/articles/957898.pdf

Data publikacji:

2018

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

alloy
modification
calcium
machining
chip
stop
modyfikacja
wapń
obróbka
żeton

Opis:

Treatment of metal alloys is one of the ways to affect the properties of the material. The article describes an experiment realized at FPTM UJEP when was experimentally studied the influence of alloys AlSi9CuMnNi calcium modification on some of its properties. The alloy was modified with various amounts of calcium and subsequently machining. Also hardness was measured in the resulting alloys. Machining was performed under certain cutting conditions. After machining the obtained chip was evaluated. Chip was evaluated for its shape, length and amount of chips per 100 g. Devices in FPTM laboratories were used to prepare experimental casts and to evaluate hardness and chips, like the melting furnace LAC K70/13, hardness tester Ernst AT 250X or microscope Olympus SZX 10. Experimental quantities of calcium was 0.05, 0.1 and 0.15 wt. %. Presented experiments are part of the extensive research undertaken at Faculty of Production Technologies and Management at Jan Evangelista Purkyně University in Ústí nad Labem.

Źródło:

Advances in Science and Technology. Research Journal; 2018, 12, 3; 32-38
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Effect of Soft Annealing Treatment on Impact Strength and Hardness of the EN AC-AlSi11 Alloy

Autorzy:

Jarko, A.

Powiązania:

https://bibliotekanauki.pl/articles/380988.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

heat treatment
aluminium alloys
alpax alloy
silumins
soft annealing
obróbka cieplna
stopy aluminium
stop alpax
siluminy
wygrzewanie

Opis:

The paper presents research on the effects of soft annealing parameters on a change of the impact strength KC and Brinell hardness (HB) of the EN AC-AlSi11 alloy. The research has been performed according to the trivalent testing plan for two input parameters – temperature in the range between 280°C and 370°C and time in the range between 2 and 8 hours. The application of such heat treatment improves the plasticity of the investigated alloy. The improvement of the impact strength KC by 71% and the decrease of the hardness HB by 20% was achieved for the soft annealing treatment conducted at a temperature 370°C for 8 hours, compared to the alloy without the heat treatment. A change of the form of eutectic silicon precipitations which underwent refinement, coagulation and partial rounding, had a direct effect on the hardness HB and impact strength KC. The results obtained were used to prepare space plots enabling the temperature and time for soft annealing treatment to be selected with reference to the obtained impact strength KC and hardness HB of the alloy with the heat treatment.

Źródło:

Archives of Foundry Engineering; 2017, 17, 3; 55-58
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:

Effect of Intensive Cooling of Alloy AC-AlSi7Mg with Alloy Additions on Microstructure and Mechanical Properties

Autorzy:

Pisarek, B.
Rapiejko, C.
Pacyniak, T.

Powiązania:

https://bibliotekanauki.pl/articles/356173.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

solidification process
aluminum alloy
alloy additions
intensive cooling
mechanical properties

Opis:

The work presents results of the investigations of effect of intensive cooling of alloy AC-AlSi7Mg with alloy additions on microstructure and mechanical properties of the obtained casts. The experimental casts were made in ceramic molds preliminarily heated to 180°C, into which AC-AlSi7Mg with alloy additions was poured. Within implementation of the research, a comparison was made of the microstructure and mechanical properties of the casts obtained in ceramic molds cooled at ambient temperature and the ones intensively cooled in a cooling liquid. Kinetics and dynamics thermal effects recorded by the TDA method were compared. Metallographic tests were performed with the use of optical microscope and strength properties of the obtained casts were examined: UTS, Elongation and HB hardness.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 677-681
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Examples of new models applied in selected simulation systems with respect to database

Autorzy:

Ignaszak, Z.
Hajkowski, J.
Popielarski, P.

Powiązania:

https://bibliotekanauki.pl/articles/379975.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

information technology
foundry industry
porosity prediction
structure prediction
database
thermophysical parameters
simulation codes
AlSi alloy
technologia informacyjna
przemysł odlewniczy
przewidywanie struktury
baza danych
parametr termofizyczny
stop Al-Si

Opis:

The tolerance of damage rule progressively meets the approval in the design casting parts procedures. Therefore, there were appeared the new challenges and expectations for permanent development of process virtualization in the mechanical engineering industry. Virtualization is increasingly developed on the stage of product design and materials technologies optimization. Increasing expectations of design and process engineers regarding the practical effectiveness of applied simulation systems with new proposed up-grades modules is observed. The purpose is to obtain simulation tools allowing the most possible realistic prognosis of the casting structure, including indication, with the highest possible probability, places in the casting that are endangered with the possibility of shrinkage– and gas porosity formation. This 3D map of discontinuities and structure transformed in local mechanical characteristics are used to calculate the local stresses and safety factors. The needs of tolerance of damage and new approach to evaluate the quality of such prognosis must be defined. These problems of validation of new models/modules used to predict the shrinkage– and gas porosity including the chosen structure parameters in the example of AlSi7 alloy are discussed in the paper.

Źródło:

Archives of Foundry Engineering; 2013, 13, 1; 45-50
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

The Crystallization of the AlSi9 Alloy Designed for the Alfin Processing of Ring Supports in Engine Pistons

Autorzy:

Piatkowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/947636.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Al-Si cast alloy
alfin processing
crystallization
microstructure alloys

Opis:

This article presents a study of the crystallization and microstructure of the AlSi9 alloy (EN AC-AlSi9) used for the alfin processing of iron ring supports in castings of silumin pistons. Alfin processing in brief is based on submerging an iron casting in an Al-Si bath, maintaining it there for a defined time period, placing it in a chill mould casting machine and immersing it in the alloy. This technology is used for iron ring supports in the pistons of internal combustion engines, among others. Thermal analysis shows that when the AlSi9 alloy contains a minimal content of iron, nucleation and increase in the triple α (Al)+Fe+(Si) eutectic containing the α -Al₈Fe₂Si phase takes place at the end of the crystallization of the double α (Al)+ß(Si) eutectic. Due to the morphology of the ”Chinese script” the -Al8Fe2Si phase is beneficial and does not reduce the alloy’s brittleness. After approx. 5 hours of alfin processing, the -Al₅FeSi phase crystallizes as a component of the α+Al₅FeSi+(Si) eutectic. Its disadvantageous morphology is ”platelike” with sharp corners, and in a microsection of the surface, ”needles” with pointed corners are visible, with increases the fragility of the AlSi9 alloys.

Źródło:

Archives of Foundry Engineering; 2020, 20, 2; 65-70
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Optimization of squeeze parameters and modification of AlSi7Mg alloy

Autorzy:

Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.

Powiązania:

https://bibliotekanauki.pl/articles/381007.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

mechanical properties
Al alloy
squeeze casting technology
modification
właściwości mechaniczne
stop Al
technologia prasowania
modyfikacja

Opis:

The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 2³ factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A₅) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.

Źródło:

Archives of Foundry Engineering; 2013, 13, 2; 113-116
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Effect of Pressure on the Crystallisation of AlSi7Mg Alloy

Autorzy:

Pastirčák, R.
Ščury, J.

Powiązania:

https://bibliotekanauki.pl/articles/355560.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

squeeze casting
heat transfer coefficient
heat flux
Al alloys
mechanical properties

Opis:

This paper deals with influencing the crystallisation of Al alloys by a direct squeeze casting method. The effects of changed cooling rates of the casting is evaluated using a heat transfer coefficient at different casting conditions. The experimental results obtained by temperature measurement of the casting and the mould were used to predict the casting and mould surface temperatures using regression curves. The measured temperatures in the sub-surface layers were used to determine the amount of heat transferred from the casting to the mould. The amount of transferred heat increased 20-fold due to the effect of pressure. We also evaluated the effect of the acting pressure on the mechanical properties and microstructure of the alloy used. The process parameters were varied in the experiment.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 4; 2193-2198
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Analysis of Crystallization Process of Intensive Cooled AlSi20CuNiCoMg Alloy

Autorzy:

Władysiak, R.
Kozuń, A.
Dębowska, K.
Pacyniak, T.

Powiązania:

https://bibliotekanauki.pl/articles/379541.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

innovative foundry technologies
innovative foundry materials
casting die cooling
water mist
silumin
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
odlewanie kokilowe
mgła wodna

Opis:

The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of multicomponent synthetic hypereutectic alloy AlSi20CuNiCoMg. The study was conducted for unmodified silumin on the research station allowing the cooling of the special permanent sampler using a program of computer control. Furthermore the study used a thermal imaging camera to analyze the solidification process of multicomponent alloy. The study demonstrated that the use of mold cooled with water mist stream allows in wide range to form the microstructure of hypereutectic multicomponent silumin. It leads to higher homogeneity of microstructure and refinement of crystallizing phases of casting.

Źródło:

Archives of Foundry Engineering; 2017, 17, 2; 137-144
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

The Effect of Water Mist Cooling of Casting Die on the Solidification, Microstructure and Properties of AlSi20 Alloy

Autorzy:

Władysiak, R.
Kozuń, A.
Pacyniak, T.

Powiązania:

https://bibliotekanauki.pl/articles/353825.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

silicon dendrites
casting die cooling
water mist
hypereutectic Al-Si alloy

Opis:

Unmodified AlSi20 alloy were casted at the research station, allowing for sequential multipoint cooling using a dedicated computer- controlled program. This method allows for the formation of the microstructure of hypereutectic AlSi20 alloy and also increases hardness. Primary silicon dendrites were found in the microstructure of cooled samples. Based on these dendrites, the formation of primary silicon particles is explained. Cooling of casting die with a water mist stream causes changes in solidification, which leads to expansion of the boundary layer with columnar crystals and shrinkage of the core zone with equiaxed crystals. It also causes more regular hardness distribution around pre-eutectic Si crystals, which can lead to tensile strength and machinability improvement.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 187-194
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Usable Properties of AlSi7Mg Alloy after Sodium or Strontium Modification

Autorzy:

Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, M.
Markowska, O.

Powiązania:

https://bibliotekanauki.pl/articles/381773.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

alloy AlSi7Mg
refining
modification
cooling rate
microstructural parameters
usable properties
stop AlSi7Mg
rafinacja
modyfikacja
szybkość chłodzenia
parametry mikrostruktury
właściwości użytkowe

Opis:

The paper deals with the effect of microstructure diversified by means of variable cooling rate on service properties of AlSi7Mg cast alloy refined traditionally with Dursalit EG 281, grain refining with titanium-boron and modified with sodium and a variant of the same alloy barbotage-refined with argon and simultaneously grain refining with titanium-boron and modified with strontium. For both alloy variants, the castings were subject to T6 thermal treatment (solution heat treatment and artificial aging). It turned out that AlSi7Mg alloy after simultaneous barbotage refining with argon and grain refining with titanium-boron and modified with strontium was characterised with lower values of representative microstructure parameters (SDAS – secondary dendrite arm spacing, λE, lmax) and lower value of the porosity ratio compared to the alloy refined traditionally with Dursalit EG 281 and grain refining with titanium-boron and modified with sodium. The higher values of mechanical properties and fatigue strength parameters were obtained for the alloy simultaneously barbotage-refined with argon and grain refining with titanium-boron and modified with strontium.

Źródło:

Archives of Foundry Engineering; 2016, 16, 3; 129-132
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Impact of Zirconium on the Structural and Mechanical Properties of Commercial AlSi10MgCu Alloys

Autorzy:

Hajduch, P.
Djurdjevic, M. B.
Bolibruchová, D.
Simicevic, Z.

Powiązania:

https://bibliotekanauki.pl/articles/356527.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

zirconium
AlSi10MgCu alloy
hardness
solid solution treatment

Opis:

The impact of small addition of zirconium in hypoeutectic commercial AlSi10MgCu alloys on their mechanical properties (hardness) in as cast and thermally treated conditions was investigated. Small addition of zirconium does not change significantly the as cast and heat-treated microstructure of investigated alloys except to reduce the SDAS and grain size of primary α-aluminium phases. Addition of zirconium up to 0.14 wt. percentage increases the hardness of investigated alloys in as cast conditions. The increase in the hardness of samples after various solid solution times can correlate very well with the formation of small needle like coherent Al₃Zr particles.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 3; 1107-1110
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Effect of multipoint sequential water mist cooling of casting die on microstructure and mechanical properties of AlSi11 alloy

Autorzy:

Władysiak, R.

Powiązania:

https://bibliotekanauki.pl/articles/380430.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
odlewanie kokilowe
mgła wodna
AlSi11
mikrostruktura
właściwości mechaniczne
innovative foundry technologies
innovative foundry materials
casting die cooling
water mist
microstructure
mechanical properties

Opis:

The work is a continuation of research on the use of water mist cooling in order to increase efficiency of the die-casting process for aluminum alloys. The paper describes the multipoint sequential cooling system of the casting die and its computer control and monitoring. It also includes results of the tests and analysis of cooling methods during making of the casting. These methods differ from each other in the sequence of casting die cooling and cause effective changes in microstructure and mechanical properties of castings made of AlSi11 alloy. The study demonstrated that the use of multipoint sequential cooling with water mist affects the microstructure refinement and reduces the segregation in the cast as well as more than by 20% increases the mechanical properties of castings in the rough state. The study also demonstrates that the sequential cooling of casting die accelerates the cooling of the casting and shortens die-casting cycle.

Źródło:

Archives of Foundry Engineering; 2012, 12, 4; 145-150
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Effect of Zirconium on the Solidification Path and Structural Properties of Commercial AlSi10MgCu Alloys

Autorzy:

Hajduch, P.
Djurdjevic, M. B.
Bolibruchová, D.
Simicevic, Z.

Powiązania:

https://bibliotekanauki.pl/articles/351378.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

zirconium
AlSi10MgCu alloy
grain size
SDAS
porosity

Opis:

Comprehensive understanding of the melt quality is of vital importance for foundry man. The effect of each particular element need to be properly analysed. Therefore, the aim of this paper was to analyse the impact of various content of zirconium on the solidification path and structural characteristics (SDAS, grain size, porosity) of as cast commercial AlSi10MgCu alloys. It has been found that addition of zirconium up to 0.24 wt.% reduce significantly the grains size (from 3.5 mm to 1.2 mm), SDAS (from 57.3 μm to 50.4 μm) and porosity (from 19% to 5%), leading to production of sound cast parts.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 2; 549-554
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

The Effect of Modifier on the Microstructure of the AlSi10CuNiMn Alloy

Autorzy:

Cais, Jaromir
Heinrich, Jiri
Jirounkova, Klara

Powiązania:

https://bibliotekanauki.pl/articles/103309.pdf

Data publikacji:

2020

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

Al-Si alloy
microstructure
modification
microscopy
stop Al-Si
mikrostruktura
modyfikacja
mikroskopia

Opis:

This paper deals with different types of modifiers and their effect on the microstructure of the Al-Si alloy. For the purposes of this research, strontium, antimony and calcium were used as the modifiers of the AlSi10CuNiMn alloy. Unmodified alloy was cast in order to be compared with the alloy modified by different modifiers in various concentrations. The results of this research were analysed via light and electron microscopy.

Źródło:

Advances in Science and Technology. Research Journal; 2020, 14, 2; 13-18
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Assessment of AlSi21CuNi alloy’s quality with use of ATND method

Autorzy:

Pezda, J.

Powiązania:

https://bibliotekanauki.pl/articles/380515.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

hypereutectic Al-Si alloy
modification
ATND
mechanical properties
stop nadeutektyczny Al-Si
modyfikacja
metoda ATND
właściwości mechaniczne

Opis:

Majority of combustion engines is produced (poured) from Al-Si alloys with low thermal expansion coefficient, so called piston silumins. Hypereutectic alloys normally contain coarse, primary angular Si particles together with eutectic Si phase. The structure and mechanical properties of these alloys are highly dependent upon cooling rate, composition, modification and heat-treatment operations. In the paper one depicts use of the ATND method (thermal-voltage-derivative analysis) and regression analysis to assessment of quality of the AlSi21CuNi alloy modified with Cu-P on stage of its preparation, in aspect of obtained mechanical properties (R_0,02, R_m, A₅, HB). Obtained dependencies enable prediction of mechanical properties of the investigated alloy in laboratory conditions, using values of characteristic points from curves of the ATND method.

Źródło:

Archives of Foundry Engineering; 2013, 13, 4; 87-92
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Influence of antimony modification and heat treatment on the AlSi9CuMnNi alloy

Autorzy:

Naprstkova, N.
Caiss, J.
Sviantek, J.

Powiązania:

https://bibliotekanauki.pl/articles/111952.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

aluminium alloy
heat treatment
manufacturing
stop aluminium
obróbka cieplna
produkcja

Opis:

Modification of alloys is an important part of the metallurgical process, and this also applies to aluminum alloys, particularly for Al-Si (silumins). As a modification of the material we can utilise the modification using the selected element or heat treatment of alloys, or a combination of both processes. One of the elements that it is possible to modify the alloy of Al-Si used is antimony (Sb). The paper examines the possible effect of the modification of that element and heat treatment on the final structure of the alloy AlSi9CuMnNi and other selected properties after machining. In the experiments three castings from the alloy AlSi9CuMnNi were made without modification, three castings with the modification and without heat treatment, three castings with modification and without heat treatment, and three castings with modification and heat treatment. The described experiment and analysis are part of extensive research undertaken at Faculty of Production Technology and Management, J. E. Purkyně University in Ústínad Labem.

Źródło:

Production Engineering Archives; 2015, 8, 3; 18-21
2353-5156
2353-7779

Pojawia się w:

Production Engineering Archives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Influence of the Mould Material Coatings on the Microstructure of AlSi7Mg Alloy

Autorzy:

Dybowski, B.
Poloczek, Ł.
Jarosz, R.
Kiełbus, A.

Powiązania:

https://bibliotekanauki.pl/articles/383041.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallography
AlSi7Mg alloy
protective coatings
sand casting
metalografia
stop AlSi7Mg
powłoki ochronne
odlewy piaskowe

Opis:

Family of the aluminium alloys with silicon addition is an important group of non-ferrous casting alloys. They exhibit very good technological properties, especially castability. Aluminium alloys are known for their low density, which in connection with high mechanical properties and relatively low price create very good structural material. Magnesium addition to the Al-Si alloys enables their age-hardening, resulting in even better mechanical properties. However, formation of the microstructure of the alloy has to be precisely controlled to avoid formation of massive, brittle silicon crystal. Presence of large, platelet-like particles of silicon, dramatically decreases material mechanical properties. Second factor, which must be taken into consideration is casting porosity, which may significantly decrease fatigue life of the element. Many researches consider effect of modification or refining on the microstructure of the castings made from the Al-Si alloys. However there is lack of detailed investigation on the mould components influence on the microstructure. Such components may be protective coatings applied for the mould sand during the gravity casting of Al-Si alloys. Following paper presents results of the research on the influence of applied mould protective coatings on the microstructure of AlSi7Mg sand cast alloy. Five different protective coatings were applied. Macro observations, qualitative and quantitative microstructure evaluation of the AlSi7Mg alloy was conducted during the researches. Results revealed, that application of the coatings does not influence the size and distribution of the α- Al dendrites, however it influences size of Si particles in a significant way. It was revealed that application of water-based coatings affects the heat flow in the mould material-liquid alloy system, thus causing growth of silicon particles.

Źródło:

Archives of Foundry Engineering; 2015, 15, 1 spec.; 13-16
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Poprawa plastyczności stopu AlSi11 przez zastosowanie wyżarzania zmiękczającego
Improvement of plasticity of the AlSi11 alloy due to soft annealing treatment

Autorzy:

Jarco, A.

Powiązania:

https://bibliotekanauki.pl/articles/391461.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa

Tematy:

stopy aluminium
wyżarzanie zmiękczające
wydłużenie
wytrzymałość na rozciąganie
aluminum alloys
soft annealing
elongation
tensile strength

Opis:

W artykule przedstawiono badania dotyczące możliwości zwiększenia plastyczności okołoeutektycznego stopu AlSi11 przez zastosowanie wyżarzania zmiękczającego. Dla dwóch przyjętych wielkości wejściowych, tj. temperatury i czasu wygrzewania, w oparciu o trójwartościowy plan przeprowadzono badania pozwalające na przedstawienie zmian wytrzymałości na rozciąganie (R_m) oraz wydłużenia (A₅) w zależności od parametrów wyżarzania zmiękczającego (temperatury z przedziału 280°C do 370°C i czasu od 2 godzin do 8 godzin). Dla średnich wartości z przyjętych zakresów temperatury i czasu uzyskano wzrost wydłużenia A₅ o około 40% w odniesieniu do wartości wyjściowej. Największy wzrost A₅ wyniósł 96%, w porównaniu do stopu wyjściowego, dla wygrzewania w temperaturze 370°C przez 8 godzin, równocześnie nieznacznie spadła wytrzymałość R_m, w granicach 15%.
The paper presents research on the possibility of improving the plasticity of near-eutectic AlSi11 alloy by the use of soft annealing treatment. For two assumed input quantities, i.e. temperature and duration of the soaking treatment, based on the trivalent testing plan, have enabled the presentation of changing tensile strength (R_m) and elongation (A₅) in function of the soft annealing parameters (temperature in the range from 280°C to 370°C and time from 2 hours to 8 hours). For average values of assumed range of temperature and time there was an increase in elongation (A₅) of about 40% compared to the starting value. The highest increase in elongation (A₅) amounted to 96%, compared to the initial alloy, which was obtained in the case of the soaking treatment at temperature 370°C for 8 hours, the tensile strength (R_m) decreased simultaneously within limits of 15%.

Źródło:

Prace Instytutu Odlewnictwa; 2016, 56, 3; 261-266
1899-2439

Pojawia się w:

Prace Instytutu Odlewnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Mechanical properties and microstructure of AlSi10Mg alloy obtained by casting and SLM technique

Autorzy:

Zyguła, Krystian
Nosek, Bartłomiej
Pasiowiec, Hubert
Szysiak, Norbert

Powiązania:

https://bibliotekanauki.pl/articles/1177412.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

AlSi10Mg
SLM - selective laser melting
aluminium alloy
heat treatment
mechanical properties
microstructure

Opis:

Selective laser melting (SLM) techniques are gaining popularity recently. Due to increasing requirements of the manufacturing industry regarding cost production reduction, methods based on additive manufacturing (AM) are more and more attractive. SLM method allows fabricating parts with minimum post-processing machining requirements. Considering the above, this technique is applied mainly in aviation, automotive industry and medicine. Manufacturing parts by SLM method demands strictly defined parameters in particular when using aluminium alloys, due to high risk of porosity. The aim of research was to evaluate the possibility of replacing traditional casting of small-lot details by novel SLM method in specified manufacturing conditions. This study contains comparison of chosen physical and mechanical properties of AlSi10Mg alloy obtained by SLM method and by casting. As-received as well as heat treated (T6 heat treatment) materials were examined. Both types of the billets were subjected to hardness, tensile and Charpy impact tests, before and after T6 heat treatment. For SLM material relative density was also specified. Microstructure of cast and SLM samples was analyzed using light microscopy. The results of the research lead to conclusion, that the key aspect is the appropriate selection of parameters of manufacturing of the parts by SLM method.

Źródło:

World Scientific News; 2018, 104; 456-466
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Effect of increased temperature on dimensional and shape accuracy of castings produced from the EN AC-AlSi11 alloy by pressure die casting process

Autorzy:

Jarco, A.

Powiązania:

https://bibliotekanauki.pl/articles/353899.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high pressure die casting
Al-Si alloy
blistering
dimensional accuracy
shape accuracy
elevated temperature behavior

Opis:

The present work discusses results of increased temperature on shape-dimensional changes of a 110 type hose coupling, produced from EN AC-AlSi11 alloy with the use of pressure die casting technology. The castings were soaked for 3.5 h at temperatures 460°C, 475°C and 490°C. The verification of shape-dimensional accuracy of the elements after soaking treatment, in relation to raw casting, was carried out by comparing the 3D models received from 3D scanning. Soaking temperature of about 460°C-475°C results in no significant changes in the shapes and dimensions of the castings, or surface defects in the form of blisters, which can be seen at a temperature of 490°C.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 325-328
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Influence of the homogenization temperature on the microstructure and properties of AlSi10CuNiMn alloy

Autorzy:

Cais, J.
Kraus, P.
Lysoňková, I.

Powiązania:

https://bibliotekanauki.pl/articles/102937.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

aluminum alloy
heat treatment
microstructure
intermetallic phase
microhardness

Opis:

The article examines the impact of changes in homogenization temperature in the hardening process on the microstructure of aluminum alloys. The research samples were cast from AlSi10CuNiMn alloy produced by gravity casting technology in metal mold. Subsequently, the castings were subjected to a heat treatment. In an experiment with changing temperature and staying time in the process of homogenization. The microstructure of the alloy was investigated by methods of light and electron microscopy. Examination of the microstructure has focused on changing the morphology of separated particles of eutectic silicon and intermetallic phases. The analysis of intermetallic phases was supplemented by an analysis of the chemical composition – EDS analysis. Effect of heat treatment on the properties investigated alloy was further complemented by Vickers microhardness. Investigated alloy is the result of longtime research conducted at the Faculty of Production Technology and Management.

Źródło:

Advances in Science and Technology. Research Journal; 2017, 11, 1; 104-110
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Properties of AlSi9Mg Alloy Matrix Composite Reinforced with Short Carbon Fibre after Remelting

Autorzy:

Łągiewka, M.
Konopka, Z.

Powiązania:

https://bibliotekanauki.pl/articles/380166.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metal matrix composite
short carbon fibre
silumin
mechanical properties
recycling of composite
kompozyt metalowy
włókno węglowe
właściwości mechaniczne
recykling kompozytu

Opis:

The presented work describes the results of examination of the mechanical properties of castings made either of AlSi9Mg alloy matrix composite reinforced with short carbon fibre or of the pure AlSi9Mg alloy. The tensile strength, the yield strength, Young’s modulus, and the unit elongation were examined both for initial castings and for castings made of the remelted composite or AlSi9Mg alloy. After preparing metallographic specimens, the structure of the remelted materials was assessed. A few non-metallic inclusions were observed in the structure of the remelted composite, not occurring in the initial castings. Mechanical testing revealed that all the examined properties of the initial composite material exceed those of the non-reinforced matrix. A decrease in mechanical properties was stated both for the metal matrix and for the composite after the remelting process, but this decrease was so slight that it either does not preclude them from further use or does not restrict the range of their application.

Źródło:

Archives of Foundry Engineering; 2015, 15, 3; 39-42
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Phase identification of nanometric precipitates in AlSi9Cu alloy after remelting by laser beam

Autorzy:

Pawlyta, M.
Labisz, K.
Matus, K.

Powiązania:

https://bibliotekanauki.pl/articles/1113264.pdf

Data publikacji:

2016-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.55.Nq
81.30.Mh
68.37.Ma

Opis:

The aim of presented paper is an investigation of the structure changes in AlSi9Cu alloy after remelting by a laser beam. Scanning transmission electron microscopy was applied for structure characterization and precipitates phase identification. In the raw material, precipitates were larger and during remelting such precipitates were dissolved and very fast crystallization came next. Observed precipitates are generally uniform: in size, shape, and chemical composition. Generally, after remelting precipitates are not uniformly distributed in the whole sample but areas with dense, nanometric precipitates are common. Numerous volumes with elongated Ti precipitates, identified as Ti(Al_{1-x}Si_{x})₃, were found. Observed precipitate can strongly affect material properties (even in a case of law Ti concentration) because it may act as a crystal nucleus for other phases.

Źródło:

Acta Physica Polonica A; 2016, 130, 4; 827-829
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Grain-Size Prediction Model in Aluminum Castings Manufactured by Low-Pressure Technology

Autorzy:

Fernández-Calvo, A. I.
Lizarralde, I.
Sal, E.
Rodríguez, P.
de Zabalegui, E. O.
Cia, I.
Rios, A.

Powiązania:

https://bibliotekanauki.pl/articles/106923.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

grain refinement
AlSi7Mg alloy
thermal modulus
cooling rate
solidification evolution

Opis:

The grain refinement in a real casting manufactured by Low Pressure Die Casting (LPDC) such as wheels and steering knuckles depends on the grain-refinement potential of the metal and the geometry of the part/process parameters. For this study, the effect of the cooling rate on the AlSi7Mg alloy with different metal qualities in terms of grain refinement was tested. The grain size has been metallographically evaluated in cylindrical test pieces and in the real wheels and steering knuckles manufactured at the Mapsa and Fagor Ederlan foundries. The Thermolan®-Al system has been used to evaluate the nucleation potential in terms of grain size on a standard cup. The grain size has been modeled taking into account the effect of the cooling rate measured in the center of the cylindrical test parts and the different grain-size potential. Different grades of refinement have been tested. The grain size measured in a real casting (wheel and steering knuckle) was used to calibrate the model for a real part in LPDC for different grain-size potential.

Źródło:

Journal of Casting & Materials Engineering; 2018, 2, 4; 71-77
2543-9901

Pojawia się w:

Journal of Casting & Materials Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Experimental investigation and modelling of Friction Stir Processing of cast aluminium alloy AlSi9Mg

Autorzy:

Węglowski, M. S.
Dymek, S.
Hamilton, C. B.

Powiązania:

https://bibliotekanauki.pl/articles/200339.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

friction stir processing
aluminum alloys
numerical modelling
neural networks
microstructure

Opis:

Friction Stir Processing (FSP) is a novel solid state processing technique which can be used for microstructural modification of surface layers in metallic materials. This paper analyzes the effects of FSP process parameters on spindle torque acting on the tool and on the tool temperature. It has been shown that an increase in the rotational speed brings about a decrease in the torque and an increase of temperature. For temperature estimation in the stir zone a numerical model was applied, while for predicting a relationship between the spindle torque acting on the tool, rotational and travelling speeds and the down force, the artificial neural networks approach was employed. Light and electron (scanning and transmission) microscopy investigation showed that the FSP process reduces porosity and produces a more uniform distribution of second-phase particles.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 893-904
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Effect of Titanium Addition on the Pro-Eutectic and Eutectic Phases of AlSi9 Cast Alloy

Autorzy:

Ait El Haj, Badiâ
Bouayad, Aboubakr
Alami, Mohammed

Powiązania:

https://bibliotekanauki.pl/articles/353725.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

AlSi9 cast alloy
grain refinement
thermal analysis
eutectic phase
Secondary Dendrite Arm Spacing
SDAS

Opis:

In this study, the effects of grain size refiner addition and various pre-heating mold temperatures on AlSi9 cast alloy microstructure and solidification have been evaluated. For different process conditions, thermal analysis was performed for all samples and cooling curves were established. Important parameters in liquidus and eutectic Si-phase regions have been calculated usingthe first derivative cooling curves. Secondary Dendrite Arm Spacing (SDAS) variation was also determined. Experimental results question the effectiveness of cooling curve parameters in providing the microstructure data as a function of refinement. The present work shows that the effect of grain refiner addition on the value of SDAS was higher when the solidification time was lower. It indicated that the solidification parameters such as nucleation temperatures of α-Al phase, undercooling temperature and total solidification time were affected by grain refinement. It has been found that the addition of grain refiner affect the eutectic phase formation time. However, it has no effect on the eutectic phase morphology.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 1; 385-391
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Effect of T6 Heat Treatment Parameters on Technological Quality of the AlSi7Mg Alloy

Autorzy:

Pezda, J.
Jarco, A.

Powiązania:

https://bibliotekanauki.pl/articles/383288.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

heat treatment
aluminum alloy
tensile strength
elongation
impact strength
obróbka cieplna
stop aluminium
wytrzymałość na rozciąganie
wydłużenie
udarność

Opis:

Very well-known advantages of aluminum alloys, such as low mass, good mechanical properties, corrosion resistance, machining-ability, high recycling potential and low cost are considered as a driving force for their development, i.e. implementation in new applications as early as in stage of structural design, as well as in development of new technological solutions. Mechanical and technological properties of the castings made from the 3xx.x group of alloys depend mainly on correctly performed processes of melting and casting, design of a mould and cast element, and a possible heat treatment. The subject-matter of this paper is elaboration of a diagrams and dependencies between parameters of dispersion hardening (temperatures and times of solutioning and ageing treatments) and mechanical properties obtained after heat treatment of the 356.0 (EN AC AlSi7Mg) alloy, enabling full control of dispersion hardening process to programming and obtaining a certain technological quality of the alloy in terms of its mechanical properties after performed heat treatments. Obtained results of the investigations have enabled obtainment of a dependencies depicting effect of parameters of the solutioning and ageing treatments on the mechanical properties (R_m, A₅ and KC impact strength) of the investigated alloy. Spatial diagrams elaborated on the basis of these dependencies enable us to determine tendencies of changes of the mechanical properties of the 356.0 alloy in complete analyzed range of temperature and duration of the solutioning and ageing operations.

Źródło:

Archives of Foundry Engineering; 2016, 16, 4; 95-100
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Effect of Different Variants of Heat Treatment on Mechanical Properties of the AlSi17CuNiMg Alloy

Autorzy:

Jarko, A.
Pezda, J.

Powiązania:

https://bibliotekanauki.pl/articles/381243.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

heat treatment
homogenizing
aluminum alloys
mechanical properties
elongation
silumin
obróbka cieplna
homogenizacja
stopy aluminium
właściwości mechaniczne

Opis:

Dispersion hardening, as the main heat treatment of silumins having additions of copper and magnesium, results in considerable increase of tensile strength and hardness, with simultaneous decrease of ductility of the alloy. In the paper is presented an attempt of introduction of heat treatment operation consisting in homogenizing treatment prior operation of the dispersion hardening, to minimize negative effects of the T6 heat treatment on plastic properties of hypereutectoidal AlSi17CuNiMg alloy. Tests of the mechanical properties were performed on a test pieces poured in standardized metal moulds. Parameters of different variants of the heat treatment, i.e. temperature and time of soaking for individual operations were selected basing on the ATD (Thermal Derivation Analysis) diagram and analysis of literature. The homogenizing treatment significantly improves ductility of the alloy, resulting in a threefold increase of the elongation and more than fourfold increase of the impact strength in comparison with initial state of the alloy. Moreover, the hardness and the tensile strength (R_m) of the alloy decrease considerably. On the other hand, combination of the homogenizing and dispersion hardening enables increase of elongation with about 40%, and increase of the impact strength with about 25%, comparing with these values after the T6 treatment, maintaining high hardness and slight increase of the tensile strength, comparing with the alloy after the dispersion hardening.

Źródło:

Archives of Foundry Engineering; 2016, 16, 2; 41-44
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Microstructural Characterisation of Friction Stir Processed Cast AlSi9Mg Aluminium Alloy

Autorzy:

Węglowski, M. S.

Powiązania:

https://bibliotekanauki.pl/articles/379980.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cast aluminium alloy
friction stir processing
FSP
microstructure
stop aluminium
obróbka tarciowa
mikrostruktura

Opis:

Aluminium alloy castings become more popular when a refined microstructure and a uniform distribution of Si particles are easily produced. One of the technologies that can fulfil these requirements is Friction Stir Processing (FSP). Therefore, the formation of various microstructural regions during FSP of AlSi9Mg alloy has been studied. It is presented that each of the regions are characterized by unique microstructures. Prior to FSP, the microstructure of a representative as-cast aluminium alloy was composed of Al dendrites and a nonuniform distribution of Si and Fe. FSP microstructurally modified and significantly refined the as-cast material, effectively eliminating the microstructural segregation and porosity of the base material. The characteristic microstructures are reflected in the hardness distribution. The hardness of the modified area was different from the base material.

Źródło:

Archives of Foundry Engineering; 2014, 14, 3 spec.; 75-78
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

The Effect of Refining and the Cooling Rate on Microstructure and Mechanical Properties of AlSi7Mg Alloy

Autorzy:

Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, A.

Powiązania:

https://bibliotekanauki.pl/articles/381386.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

AlSi7Mg alloy
material compactness
microstructure parameter
mechanical properties
stop AlSi7Mg
zwięzłość materiału
właściwości mechaniczne

Opis:

The paper presents results of research on the effect of conventional refining with hexachloroethane and the cooling rate v_cool. ranging within the solidification temperature regime from 12.5°C/min to 94.5°C/min on compactness of the material, values of microstructure parameters λ_2D, λ_E, l_maxSi, and mechanical properties R_m, R_0,2, A₅ of unmodified AlSi7Mg alloy after heat treatment (solution treatment 540°C/6 h/water 20°C and aging 175°C/8 h/air). It has been found that as a result of refining and increased cooling rate, an improvement of material compactness occurred (reduction of the density index by 0.4%) accompanied by a decrease of values of parameters characterizing the microstructure: λ_2D by 54.4 μm; λ_E by 4,6 μm; and l_maxSi by 50 μm. As a result of these changes, the value of R_m increased by about 40 MPa and R_0.2 improved by about 36 MPa, while the value of A₅ decreased by 1.3%.

Źródło:

Archives of Foundry Engineering; 2015, 15, 3 spec.; 83-86
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Machinability of modified AlSi7Mg0,3 alloy

Autorzy:

Naprstkova, N.
Cais, J.

Powiązania:

https://bibliotekanauki.pl/articles/111908.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

alloy
Al-Si
modification
machining
hardness
chip
stop
modyfikacja
twardość
wiór

Opis:

Al Alloys have an important position in the industry, mainly in the automotive and aerospace industries. One important group is silumins (Al-Si alloys). Al-Si alloys are the leading casting alloys based on aluminum. Machining of aluminum alloys is currently frequently used and it is an important area of production. This paper deals with an experiment that was conducted at the Faculty of Production Technology and Management, University of Jan Evangelista Purkyně in Ústí nad Labem, where alloy AlSi7Mg0,3 was experimented upon. Samples were made for processing from the master alloy AlSi7Mg0,3, subsequently unmodified and modified of Sr, Ca and Sb. This paper describes the evaluation of hardness, chip and tool wear in terms of how modification by Sr, Ca and Sb may affect analytical values.

Źródło:

Production Engineering Archives; 2014, 3, 2; 10-13
2353-5156
2353-7779

Pojawia się w:

Production Engineering Archives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Accuracy of ceramic mould filling with liquid AlSi9 aluminium alloy in the process using back-pressure

Autorzy:

Karwiński, A.
Haratym, R.
Biernacki, R.

Powiązania:

https://bibliotekanauki.pl/articles/381142.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

casting
back pressure
investment casting process
capillarity phenomena
odlewanie
przeciwciśnienie
metoda wytapianych modeli
zjawisko kapilarne

Opis:

The paper presents the effect of suction pressure exerted on the liquid AlSi alloy when it is introduced into a ceramic mould made in the investment process and the results compared with data obtained on gravity poured castings. The study used special pattern sets and ceramic moulds made with the alternately applied soluble silicate binder and ethyl silicate. Additionally, self-supported moulds based entirely on the Ekosil binder were used. In the analysis of castings, the following parameters were examined: a linear dimensional accuracy, the state of surface microgeometry and the possibility of metal penetration into a complex ceramic mould, allowing also for the presence of capillary phenomena. In the process of casting with back-pressure, the pressure values of 500 hPa, 600 hPa and 700 hPa were applied in the chamber where the ceramic mould was located, with the temperature of the said mould kept at a level of 150±10ºC.

Źródło:

Archives of Foundry Engineering; 2013, 13, 1; 73-76
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Effect of Filter Thickness on Reoxidation and Mechanical Properties of Aluminium Alloy AlSi7Mg0.3

Autorzy:

Bruna, M.
Remišová, A.
Sládek, A.

Powiązania:

https://bibliotekanauki.pl/articles/352359.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bifilm
numerical simulation
reoxidation
mechanical properties
filtration

Opis:

The melt cleaning is an important aspect in the production of high-quality aluminum castings. Specifically inclusions within the melt and an excessively high hydrogen content lead to defects and undesired porosity in the castings. Although it is possible to reduce the amount of hydrogen and oxidic inclusions by purge gas treatment and the use of melting salts, it is impossible toremove oxides (bifilms) created during filling of gating system. Paper deals with the effects of melt quality and the placement of a filter in the filling system on Al-7%Si-Mg alloy mechanical properties. Three different filters were used: (a) rectangular ceramic pressed filter with 3 mm thickness (b) cubical pressed ceramic filter with thickness 10 mm (c) cubical pressed ceramic filter with thickness 22 mm. The results showed that the highest tensile strength values were obtained from the filter with thickness of 22 mm. Numerical simulation analysis of the filling process showed that velocity reduction by filter is the major phenomenon affecting the mechanical properties. Another evaluated aspect during experiments was capability of filters to retain old bifilms. For this purpose multiply remelted alloy was prepared and analyzed. Results showed that filter efficiency increases with decreasing melt quality as a result of possibility to retain "old” bifilms better than small and thin "new” bifilms.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 3; 1100-1106
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Modification of pure Al and AlSi2 alloy primary structure with use of electromagnetic stirring method
Modyfikacja struktury pierwotnej czystego Al i stopu AlSi2 metodą mieszania elektromagnetycznego

Autorzy:

Wróbel, T.
Szajnar, J.

Powiązania:

https://bibliotekanauki.pl/articles/351152.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

casting
alluminium
primary structure
modification
electromagnetic stirring
odlew
aluminium
struktura pierwotna
modyfikacja
mieszanie elektromagnetyczne

Opis:

The paper presents modification of primary structure of Al 99,5% and 99,8% purity and AlSi2 alloy by electromagnetic stirring of liquid metal within foundry mould. The movement of solidifying liquid metal within the mould was forced by horizontal electromagnetic field produced by the induction coil (stirrer), supplied by current of elevated frequency. The structure refinement obtained by electromagnetic stirring was compared with refinement obtained by traditional modification, i.e. by introducing Ti, B, C and Sr modifying additives into melt. The results of studies show possibility of effective primary structure refinement of pure Al and selected Al-Si alloy by using only horizontal electromagnetic field, without necessity of Ti, B and C additives application.
W pracy przedstawiono problematykę modyfikacji struktury Al o czystości 99,5% i 99,8% oraz stopu AlSi2, realizowanej głównie poprzez intensyfikacje ruchu ciekłego metalu w formie. W celu realizacji wymuszonego ruchu krzepnącego metalu zastosowano pole elektromagnetyczne wytwarzane przez cewkę (mieszadło) zasilane prądem o podwyższonej częstotliwości. Efekt rozdrobnienia struktury uzyskany w wyniku użycia mieszania elektromagnetycznego był porównywany z możliwym do otrzymania przy użyciu tradycyjnej modyfikacji, która polega na wprowadzeniu do ciekłego metalu dodatków tytanu, boru, węgla i strontu. Wyniki badań oraz ich analizą pokazały, że istnieje możliwość skutecznego rozdrobnienia struktury pierwotnej czystego Al i wybranego stopu Al-Si tylko przy użyciu mieszania elektromagnetycznego bez konieczności stosowania dodatków modyfikujacych tj. Ti, B i C.

Źródło:

Archives of Metallurgy and Materials; 2013, 58, 3; 941-944
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Crystallization of the Structural Components of Multiple Remelted AlSi9Cu3 Alloy

Autorzy:

Matejka, M.
Bolibruchova, D.
Kuriš, M.

Powiązania:

https://bibliotekanauki.pl/articles/1837683.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Al-Si-Cu
remelting
returnable material
structural components
scanning electron microscope

Opis:

At present, Al-Si-Cu based alloys (with a typical representative AlSi9Cu3 alloy) represent more than half of the castings used in various industries (automotive, aerospace and electrical engineering). These are most often sub-eutectic (exceptionally eutectic) alloys with a content of 6 to 13 wt. % Si and 1 to 5 wt. % Cu. The aim of the paper is to point out the importance of the evaluation of input raw materials that determines the overall properties of the casting and the costs invested in its production. A negative impact on performance can be expected when using an alloy made up of a high proportion of recycled material, despite its economic benefits. Experimental alloys were evaluated based on the results of crystallization process and a combination of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and deep etching. The effect of remelting and increasing the remelted returnable material in the batch was manifested especially in the crystallization of iron-rich phases. The negative effect of remelting on the structural components was manifested after the fourth remelting. Gradual increase of remelted returnable material in the batch causes harmful changes in the crystallization process.

Źródło:

Archives of Foundry Engineering; 2021, 21, 2; 41-45
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Evaluation of 2D and 3D Surface Roughness of Die Castings from Alloy AlSi9Cu3

Autorzy:

Pałyga, Ł.
Stachowicz, M.
Granat, K.

Powiązania:

https://bibliotekanauki.pl/articles/382625.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

die casting
roughness
surface parameters
SEM
odlewnictwo ciśnieniowe
chropowatość
parametry powierzchniowe

Opis:

This paper presents the possibility of evaluating the 3D surface roughness of a raw die castings made from alloy AlSi9Cu3, group EN AB- 46000. Castings were produced on BUHLER H630-B die casting machine with various piston speed. The study was conducted on casting bracket for seatbacks office chair, whose surface do not require further machining to obtain adequate surface quality. In order to reduce the impact of possible surface mold roughness wear, the specimen has been taken from the places furthest away from the supply system. Evaluates of 3D surface roughness of specimens was performed on specialized software delivered with scanning electron microscope. After conducting a series of test on surface topography was evaluated roughness of raw castings produced with variable parameters of process control, such as piston speed during II Phase. It was found that the method used to measure 2D and 3D roughness parameters could be more practical in evaluating the quality of die castings, but it should be combined with the way their manufacturing and other destructive and non-destructive evaluation.

Źródło:

Archives of Foundry Engineering; 2015, 15, 1 spec.; 75-80
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Improving Quality of the EN AC-43300 (AlSi9Mg) Alloy Destined for Castings of a Pump Casings

Autorzy:

Jarco, A.
Dudyk, M.
Płonka, S.

Powiązania:

https://bibliotekanauki.pl/articles/381768.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

mechanical properties
hypoeutectic silumin
refining
ATD-AED method
właściwości mechaniczne
silumin podeutektyczny
rafinacja krzemu
metoda ATD AED

Opis:

Among non-ferrous alloys, the aluminum alloys have found the most widespread applications within foundry industry. Hypoeutectic silumin of the AlSi9Mg grade is commonly used for large, heavy duty machinery castings with complicated shape and high strength. From technical point of view, tendency to creation of coarse structure can be considered as a drawback of such alloy, what can have adverse effect on properties of the alloy. To obtain optimal structure of the castings and to assure improvement of their mechanical properties, the most effective treatment to perform is modification. Quality of performed modification treatment depends on proper dosing of inoculant and maintaining suitable temperature and time of keeping the alloy before pouring. In the paper are presented test results of crystallization course of refined and modified silumin of the EN AC–43300 (AlSi9Mg) grade, used in castings of pump casings. It has been determined an effect of performed processes of refining and modification on the mechanical properties (R_m, A₅, HB and KCV), additionally, metallurgical tests of the alloy have been performed. Basing on analysis of obtained results, the most advantageous modification variant, which is suitable for castings of pump casings and complying with requirements of customers, has been selected.

Źródło:

Archives of Foundry Engineering; 2015, 15, 2 spec.; 31-34
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Effect of Post-Heat Treatment on the Wear Properties of AlSi10Mg Alloy Manufactured by Selective Laser Melting

Autorzy:

Park, Tae-Hyun
Baek, Min-Seok
Sohn, Yongho
Lee, Kee-Ahn

Powiązania:

https://bibliotekanauki.pl/articles/352450.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

selective laser melting
SLM
AlSi10Mg
heat treatment
microstructure
wear

Opis:

Microstructure and wear property of AlSi10Mg alloy manufactured by selective laser melting (SLM) were investigated. Also, the effect of post heat treatment on the mechanical and wear properties was examined. Two kinds of heat treatments (direct aging (DA) and T6) were separately conducted to SLM AlSi10Mg alloy. As-built alloy had a cellular structure formed inside the moltenpool. Eutectic Si was also observed at the cellular boundary in as-built alloy. After DA heat treatment, the cellular structure still remained, and a large amount of nano-size Si particles were newly formed inside the cell structure. Both molten pool and cellular structure disappeared, and the size of Si increased in T6 alloy. The values of Vickers hardness measured as 139.4 HV (DA alloy), 128.0 HV (As-built alloy) and 85.1 HV (T6 alloy), respectively. However, concerning to wear property, T6 alloy showed better wear resistance than other alloys. The correlation between microstructure and wear mechanism of SLM AlSi10Mg alloy was also discussed.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 3; 1073-1080
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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