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Wyświetlanie 1-15 z 42
Tytuł:
Copper in Ausferritic Compacted Graphite Iron
Autorzy:
Gumienny, G.
Kacprzyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/381542.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theory of crystallization
compacted graphite iron
ausferrite
DTA method
teoria krystalizacji
stop żelaza
ausferyt
metoda DTA
Opis:
This paper shows how it is possible to obtain an ausferrite in compacted graphite iron (CGI) without heat treatment of castings. Vermicular graphite in cast iron was obtained using Inmold technology. Molybdenum was used as alloying additive at a concentration from 1.6 to 1.7% and copper at a concentration from 1 to 3%. It was shown that ausferrite could be obtained in CGI through the addition of molybdenum and copper in castings with a wall thickness of 3, 6, 12 and 24 mm. Thereby the expensive heat treatment of castings was eliminated. The investigation focuses on the influence of copper on the crystallization temperature of the graphite eutectic mixture in cast iron with the compacted graphite. It has been shown that copper increases the eutectic crystallization temperature in CGI. It presents how this element influences ausferrite microhardness as well as the hardness of the tested iron alloy. It has been shown that above-mentioned properties increases with increasing the copper concentration.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 162-166
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Gadolinium on the Microstructure of Magnesium Alloy AZ91
Autorzy:
Rapiejko, Cezary
Mikusek, D.
Just, P.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/1837784.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
solidification process
magnesium alloys
gadolinium
DTA process
metalografia
proces krzepnięcia
stopy magnezu
gadolin
proces DTA
Opis:
The paper presents the results of research related to the possibility of inoculation of the AZ91 magnesium alloy casted into ceramic moulds by gadolinium. Effects of gadolinium content (0.1–0.6 wt%) on microstructure of the AZ91 alloy under as-cast state were investigated. The influence of the inoculator on the formation of the microstructure investigated by means of the thermal and derivative analysis by analysing the thermal effects arising during the alloy crystallization resulting from the phases formed. The degree of fragmentation of the microstructure of the tested alloys was assessed by means of the light microscopy studies and an image analysis with statistical analysis was performed. Conducted analyses have aimed at examining on the effect of inoculation of the gadolinium on the differences between the grain diameters and average size of each type of grain by way of measuring their perimeters of all phases, preliminary αMg and eutectics αMg+γ(Mg17Al12) in the prepared examined material.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 31-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Gadolinium on the Microstructure of Magnesium Alloy AZ91
Autorzy:
Rapiejko, C.
Mikusek, D.
Just, P.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/1837850.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
solidification process
magnesium alloys
gadolinium
DTA process
metalografia
proces krzepnięcia
stopy magnezu
gadolin
proces DTA
Opis:
The paper presents the results of research related to the possibility of inoculation of the AZ91 magnesium alloy casted into ceramic moulds by gadolinium. Effects of gadolinium content (0.1–0.6 wt%) on microstructure of the AZ91 alloy under as-cast state were investigated. The influence of the inoculator on the formation of the microstructure investigated by means of the thermal and derivative analysis by analysing the thermal effects arising during the alloy crystallization resulting from the phases formed. The degree of fragmentation of the microstructure of the tested alloys was assessed by means of the light microscopy studies and an image analysis with statistical analysis was performed. Conducted analyses have aimed at examining on the effect of inoculation of the gadolinium on the differences between the grain diameters and average size of each type of grain by way of measuring their perimeters of all phases, preliminary αMg and eutectics αMg+γ(Mg17Al12) in the prepared examined material.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 31-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Inoculant Emgesal® Flux 5 on the Microstructure of Magnesium Alloy AZ91
Autorzy:
Rapiejko, C.
Mikusek, D.
Andrzejczak, A.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/380314.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
solidification process
magnesium alloys
Emgesal® Flux 5
DTA process
metalografia
proces krzepnięcia
stopy magnezu
testy DTA
Opis:
This work presents the results of the research of the effect of the inoculant Emgesal Flux 5 on the microstructure of the magnesium alloy AZ91. The concentration of the inoculant was increased in samples in the range from 0.1% to 0.6%. The thermal processes were examined with the use of Derivative and Thermal Analysis (DTA). During the examination, the DTA samplers were preheated up to 180 °C. A particular attention was paid to finding the optimum amount of inoculant, which would cause fragmentation of the microstructure. The concentration of each element was verified by means of a spark spectrometer. In addition, the microstructures of the samples were examined with the use of an optical microscope, and an image analysis with a statistical analysis using the NIS-Elements program were carried out. Those analyses aimed at examining the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared samples as well as the average size of each type of grain by way of measuring their perimeters. This paper is an introduction to a further research of grain refinement in magnesium alloys, especially AZ91. Another purpose of this research is to achieve better micro-structure fragmentation of magnesium alloys without the related changes of the chemical composition, which should improve the mechanical properties.
Źródło:
Archives of Foundry Engineering; 2019, 2; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primary Crystallization of High Chromium Cast Steel in Metastable Conditions
Autorzy:
Studnicki, A.
Kondracki, M.
Szajnar, J.
Powiązania:
https://bibliotekanauki.pl/articles/382201.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transport system
chromium cast steel
primary crystallization
DTA method
system transportowy
stal chromowana
krystalizacja pierwotna
metoda DTA
Opis:
The analysis of the primary crystallization of wear corrosive-erosive high chromium cast steel was introduced in the article on the basis of investigations the widened method of the differential thermal analysis with testers DTA-C and DTA-Is. The use of these testers enabled the analysis of crystallization for the various rates of cooling.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 59-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing effect on nickel oxide nanoparticles synthesized by sol-gel method
Autorzy:
Kavitha, B.
Nirmala, M.
Pavithra, A.
Powiązania:
https://bibliotekanauki.pl/articles/1189956.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nickel Oxide nanoparticles
XRD
SEM
TGA-DTA
Opis:
NiO nanoparticles were synthesized by Sol-Gel method and the synthesized nanoparticles were annealed at different temperatures. The powders were investigated with x-ray diffraction, scanning electron microscopy and TGA. The structural characterization was carried out by x-ray diffraction which confirms the polycrystalline nature of the films with a cubic structure. SEM analysis of the films enabled the conclusion that the prepared films are uniform, rough, large crystals and agglomeration of particles were observed. The thermal stability of the sample was examined by TGA analysis which showed NiO nanoparticles formed between 130-720 C.
Źródło:
World Scientific News; 2016, 52; 118-129
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the possibility of utilising waste materials from the aluminium production in the copper alloys refining processes
Autorzy:
Bydałek, A. W.
Bydałek, A.
Biernat, S.
Schlafka, P.
Powiązania:
https://bibliotekanauki.pl/articles/382855.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reaction stimulator
slag
DTA
stymulator reakcji
żużel
Opis:
The analysis of possibilities of utilising waste materials as equivalents of substances stimulating in copper alloys refining processes was presented. The results of thermogravimetric investigations determining the refining ability of the slag with the selected waste materials from the aluminium production were discussed. The possibility of optimisation of the refining slag composition on the basis of the Slag-Prop software was indicated.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Manganese on the Crystallisation Process, Microstructure and Selected Properties of Compacted Graphite iron
Autorzy:
Gumienny, G.
Kurowska, B.
Just, P.
Powiązania:
https://bibliotekanauki.pl/articles/354354.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
compacted graphite iron
crystallization
manganese
DTA method
Opis:
The paper presents the effect of manganese on the crystallization process, microstructure and selected properties: cast iron hardness as well as ferrite and pearlite microhardness. The compacted graphite was obtained by Inmold technology. The lack of significant effect on the temperature of the eutectic transformation was demonstrated. On the other hand, a significant reduction in the eutectoid transformation temperature with increasing manganese concentration has been shown. The effect of manganese on microstructure of cast iron with compacted graphite considering casting wall thickness was investigated and described. The nomograms describing the microstructure of compacted graphite iron versus manganese concentration were developed. The effect of manganese on the hardness of cast iron and microhardness of ferrite and pearlite were given.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1269-1275
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypoeutectic Silumin to Pressure Die Casting with Vanadium and Tungsten
Autorzy:
Szymczak, T.
Gumienny, G.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/354656.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multicomponent silumins
pressure die casting
DTA method
Opis:
The basic aim of this study is to investigate the effect of vanadium and tungsten on the crystallization process, microstructure and mechanical properties of silumin grade EN-AC 46000. The research involved a derivative thermal analysis DTA of the crystallization process, the metallographic analysis as well as the mechanical properties. The metallographic analysis was carried out on pressure die castings and made in the DTA probe. Vanadium and tungsten were added simultaneously to silumin in amount of approximately 0.1; 0.2; 0.3 and 0.4%. The DTA studies have shown the similar shape of all crystallization curves. It has been shown the additives of vanadium and tungsten in pressure die cast silumin can significantly increase its tensile strength as an well as elongation.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2103-2110
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Copper on the Crystallization Process, Microstructure and Selected Properties of CGI
Autorzy:
Gumienny, G.
Kacprzyk, B.
Gawroński, J.
Powiązania:
https://bibliotekanauki.pl/articles/381656.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theory of crystallization
compacted graphite iron
copper
DTA method
teoria krystalizacji
zagęszczone żelazo grafitowe
miedź
metoda DTA
Opis:
The paper presents the results of the research on the effect of copper on the crystallization process, microstructure and selected properties of the compacted graphite iron. Compacted graphite in cast iron was obtained using Inmold process. The study involved the cast iron containing copper at a concentration up to approximately 4%. The effect of copper on the temperature of the eutectic crystallization as well as the temperature of start and finish of the austenite transformation was given. It has been shown that copper increases the maximum temperature of the eutectic transformation approximately by 5 oC per 1% Cu, and the temperature of the this transformation finish approximately by 8 o C per 1% Cu. This element decreases the temperature of the austenite transformation start approximately by 5 oC per 1% Cu, and the finish of this transformation approximately by 6oC per 1% Cu. It was found that in the microstructure of the compacted graphite iron containing about 3.8% Cu, there are still ferrite precipitations near the compacted graphite. The effect of copper on the hardness of cast iron and the pearlite microhardness was given. This stems from the high propensity to direct ferritization of this type of cast iron. It has been shown copper increases the hardness of compacted graphite iron both due to its pearlite forming action as well as because of the increase in the pearlite microhardness (up to approx. 3% Cu). The conducted studies have shown copper increases the hardness of the compacted graphite iron approximately by 35 HB per 1% Cu.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 51-56
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Inoculation on the Mechanical Properties of AZ91
Autorzy:
Rapiejko, Cezary
Mikusek, D.
Kubiak, Krzysztof
Pacyniak, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/27314149.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
metallography
solidification process
magnesium alloys
Emgesal® Flux 5
DTA process
metalografia
proces krzepnięcia
stopy magnezu
proces DTA
Opis:
The effect of Ca element on the microstructure evolution of the AZ91 magnesium alloy was investigated in this research. The magnesium-aluminium alloy AZ91 was inoculated with the Emgesal® Flux 5 to refine its microstructure and also improve its microstructure. Six different concentrations of the Emgesal® Flux 5 content were tested, ranging from 0.1 to 0.6% wt., and compared to the baseline of the AZ91 alloy without inoculation. Melted metal was poured into a preheated metallic mould. Samples to test were achieved after turning treatment. Formed microstructure was assessed using an optical microscope. The microstructure was refined for every tested samples. Mechanical properties such as tensile strength, elongation, Brinell hardness, Vickers microhardness, abrasion resistance and adhesive resistance were tested on the inoculated samples and compared to the non-inoculated AZ91. Introducing an Emgesal®Flux 5 inoculant caused a change in the tensile strength, elongation, Brinell hardness, Vickers microhardness, abrasive wear resistance as well as adhesive wear resistance in each examined concentration.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 15--20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nickel in Compacted Graphite Iron
Autorzy:
Gumienny, G.
Kurowska, B.
Szymczak, T.
Gawroński, J.
Powiązania:
https://bibliotekanauki.pl/articles/352803.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
compacted graphite iron
crystallization process
DTA method
Opis:
The paper presents results of the research work concerning effects of nickel concentration on the crystallization process, microstructure and selected properties of the compacted graphite iron. Compacted graphite in the cast iron was obtained with use of the Inmold process. The study has comprised the cast iron containing nickel up to concentration providing obtainment of austenitic microstructure of the matrix. The effect of the nickel on temperature of the eutectic crystallization was specified. It has been presented composition of the cast iron matrix in function of nickel concentration in a casting with wall thickness of 3 mm and 24 mm. Moreover, it has been presented conditions defining the possibility of obtaining an austenitic and martensitic compacted graphite iron. Effect of the nickel on hardness of the cast iron was described.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 657-662
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DTA Thermal Analysis of Alloys from Nickel-Rich Part of Ni-Al-Cr System
Autorzy:
Maciąg, T.
Powiązania:
https://bibliotekanauki.pl/articles/351762.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-Al-Cr system
order-disorder
DTA analysis
Opis:
Thermal analysis allows for determination of temperature specific for the beginning and the end of phase transitions occurring in studied samples. In this paper results obtained from DTA (Differential Thermal Analysis) of alloys of chemical composition referring to nickel-rich part of Ni-Al-Cr system, specifically from section Ni75Al25÷Ni65Cr35 are presented. Those alloys are based on intermetallic phase Ni3 Al. Referring to measurements obtained during heating and cooling, characteristic peaks related to occurrence of phase transition of order-disorder type were noted as well as melting and solidification temperature of alloys was determined. Results of thermal analysis DTA of studied range were compared with results obtained for section Ni75Al25÷Ni75Cr25 and Ni75Al25÷Ni87Cr13, additionally results of measurements performed on high-temperature solution calorimeter were collated. Both methods presented good compatibility.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 981-986
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Mischmetal on the Microstructure of the Magnesium Alloy AZ91
Autorzy:
Mikusek, D.
Rapiejko, C.
Walisiak, D.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/379653.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
solidification process
magnesium alloys
alloy additives
mischmetal
DTA process
metalografia
proces krzepnięcia
stopy magnezu
dodatki stopowe
miszmetal
proces DTA
Opis:
In this paper is discussed the effect of the inoculant mischmetal addition on the microstructure of the magnesium alloy AZ91. The concentration of the inoculant was increased in the samples within the range from 0.1% up to 0.6%. The thermal process was performed with the use of Derivative and Thermal Analysis (DTA). A particular attention was paid to finding the optimal amount of the inoculant, which causes fragmentation of the microstructure. The concentration of each element was verified with use of a spark spectrometer. In addition, the microstructures of every samples were examined with the use of an optical microscope and also was performed an image analysis with a statistical analysis using the NIS - Elements program. The point of those analyses was to examine the differences in the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared samples as well as the average size of each type of grain by way of measuring their perimeters. This paper is the second part of the introduction into a bigger research on grain refinement of magnesium alloys, especially AZ91. Another purpose of this research is to achieve better microstructure fragmentation of magnesium alloys without the relevant changes of the chemical composition, which should improve the mechanical properties.
Źródło:
Archives of Foundry Engineering; 2019, 4; 45-50
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Behavior of Bentonite Binders for the Elevated and High Temperatures
Zachowanie bentonitów odlewniczych w podwyższonych i wysokich temperaturach
Autorzy:
Jelínek, P.
Dobosz, S. M.
Beňo, J.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/356493.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bentonite
thermostability
DTA/TG analysis
XRFS analysis
mechanical properties
bentonite soda - activation
bentonit
termostabilność
analiza DTA/TG
analiza XRFS
właściwości mechaniczne
Opis:
Bentonite binders rank among the most widespread applied systems for the production of molds. Their resistance to high temperatures (thermal stability) is mainly defined by genesis of binders, chemical composition and the content of Montmorillonite. The aim of this contribution is to compare selected bentonite binders commonly used in the foundries of the Central European region, in different ways of the thermostability determination as a result of changes of the mechanical strengths of the bentonite bonded sand mixture.
Masy formierskie z bentonitem jako materiałem wiążącym stanowią najbardziej rozpowszechnioną technologię otrzymywania form odlewniczych. Ich odporność na wysokie temperatury (stabilność termiczna) jest uzależniona od pochodzenia minerologicznego, składu chemicznego oraz zawartości montmorylonitu w bentonicie. Celem tego artykułu jest porównanie stabilności termicznej wybranych bentonitów - powszechnie stosowanych w odlewniach w regionie Europy Środkowej – mierzonej różnymi metodami. Kryterium oceny tych metod jest zmiana wytrzymałości mechanicznej mas formierskich wiązanych bentonitem.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 1041-1044
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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