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Tytuł:
Microstructure and Fatigue Life of the Binary Lead-free Alloys with High Zn Content
Autorzy:
Pietrzak, K.
Klasik, A.
Maj, M.
Sobczak, N.
Powiązania:
https://bibliotekanauki.pl/articles/382479.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lead free alloy
alloy microstructure
mechanical properties
stop bezołowiowy
mikrostruktura stopu
właściwości mechaniczne
Opis:
The results of studies presented in this article are an example of the research activity of the authors related to lead-free alloys. The studies covered binary SnZn90 and SnZn95 lead-free alloys, including their microstructure and complex mechanical characteristics. The microstructure was examined by both light microscopy (LM) and scanning electron microscopy (SEM). The identification of alloy chemical composition in micro-areas was performed by SEM/EDS method. As regards light microscopy, the assessment was of both qualitative and quantitative character. The determination of the geometrical parameters of microstructure was based on an original combinatorial method using phase quantum theory. Comprehensive characterization of mechanical behavior with a focus on fatigue life of alloys was performed by means of the original modified low cycle fatigue method (MLCF) adapted to the actually available test machine. The article discusses the fatigue life of binary SnZn90 and SnZn95 alloys in terms of their microstructure. Additionally, the benefits resulting from the use of the combinatorial method in microstructure examinations and MLCF test in the quick estimation of several mechanical parameters have been underlined.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 65-70
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ szybkości stygnięcia na liczbę ziaren pierwotnych stopu Al-5Cu
The Influence of Cooling Rate on the Number of Primary Grains in Al-5Cu Alloy
Autorzy:
Górny, M.
Sikora, G.
Powiązania:
https://bibliotekanauki.pl/articles/379829.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metalografia
szybkość stygnięcia
mikrostruktura stopu
stop aluminium
metallography
cooling rate
alloy microstructure
aluminium alloy
Opis:
W niniejszej pracy zbadano zagadnienie wpływu szybkości stygnięcia na liczbę ziaren pierwotnych α(Al) w stopie Al-5Cu. Badania przeprowadzono dla odlewów o grubości ścianek z zakresu 3-25 mm. W celu wyznaczenia szybkości stygnięcia oraz stopnia przechłodzenia na początku krystalizacji zarejestrowano krzywe stygnięcia. Badania wykazały, że szybkość stygnięcia zwiększa się ekspotencjalnie w miarę zmniejszania grubości ścianki odlewu. Z przeprowadzonych badań wynika, że szybkość stygnięcia odlewów zmienia się w szerokim zakresie (21,5-1,6 ºC/s) przy zmianie grubości ścianki od 3-25 mm. Przeprowadzono badania metalograficzne celem określenia gęstości ziaren pierwotnych (liczby ziaren pierwotnych α(Al) na jednostkę objętości). Przedstawiono zależności wiążące liczbę ziaren pierwotnych z szybkością stygnięcia, a także ze stopniem przechłodzenia (ΔTm= Te-Tmin, gdzie Te - równowagowa temperatura krystalizacji (likwidus), Tmin - minimalna temperatura na początku krystalizacji fazy α(Al)). Badania wykazały, że liczbę ziaren pierwotnych można opisać z wysokim współczynnikiem korelacji za pomocą zależności potęgowej w funkcji szybkości stygnięcia.
This paper investigated the influence of cooling rate on the number of primary grains α(Al) in Al-5Cu alloy. The study was conducted on castings with wall thickness in the range of 3-25 mm. In order to determine cooling rate and maximum undercooling at the beginning of the solidification the cooling curves were recorded. Research has shown that the cooling rate increases exponentially with decreasing wall thickness of the casting. Moreover it has been shown that the cooling rate of castings varies widely (21.5-1.6 °C / s) when changing the wall thickness from 3 up to 25 mm. Metallographic studies were performed to determine the primary grain density (the number of grains of primary α(Al) per unit volume). The relationship combining the number of primary grains with the cooling rate and maximum undercooling (ΔTm=Te-Tmin, where Te - equilibrium solidification temperature (liquidus), Tmin - minimum temperature at the beginning of the solidification of α(Al) phase). Research has also shown that the number of primary grains can be described with a high correlation coefficient by the power function of the cooling rate.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 25-30
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przykład obróbki cieplnej odlewów z żeliwa wysokochromowego
Example of Heat Treatment of High Chromium Cast Iron
Autorzy:
Siekaniec, D.
Szczęsny, A.
Kopyciński, D.
Powiązania:
https://bibliotekanauki.pl/articles/380144.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obróbka cieplna
żeliwo wysokochromowe
mikrostruktura odlewu
twardość odlewu
heat treatment
high chromium cast iron
alloy microstructure
alloy hardness
Opis:
Żeliwo wysokochromowe jest powszechnie stosowanym materiałem w przemyśle górniczym i mineralnym, gdzie wymagana jest duża odporność na zużycie ścierne. Swoje dobre właściwości zawdzięcza obecności w mikrostrukturze twardych węglików. Żeliwo chromowe poddawane hartowaniu ma w praktyce osnowę austenityczną, austenityczno-perlityczną lub perlityczną. Istotnym procesem w czasie obróbki cieplnej jest tzw. destabilizacja austenitu, jest on ważny ponieważ dopiero po jego zajściu może nastąpić przemiana martenzytyczna. W zależności od szybkości chłodzenia, które następuje po procesie destabilizacji austenitu, może powstać perlit, bainit i martenzyt. Przeprowadzone badania dotyczyły określenia wpływu szybkości chłodzenia odlewów z żeliwa wysokochromowego po obróbce cieplnej, na mikrostrukturę i twardość. Badaniu zostało poddane żeliwo wysokochromowe o zawartości 27%Cr i 2,7%C. Przeprowadzono zabieg hartowania z temperatury 950 °C w czasie 4h, następnie odlewy poddano trzem wariantom chłodzenia – w wodzie, w kąpieli solnej i na powietrzu. Zbadano i porównano mikrostrukturę oraz twardość odlewów dla różnych wariantów chłodzenia.
High Chromium Cast Iron (HCCI) is widely use in mining and mineral industry, where abrasive resistance is a principal requirement. Its good properties thanks to the hard eutectic carbides occurring in the microstructure. The effect of heat treatment on HCCI was a subject of many research. High Chromium Cast Iron have an austenitic, austenitic-pearlitic or pearlitic matrix. An important process during the heat treatment is austenite destabilization, thus until after it conduct the martensitic transformation can occur. Depending on the cooling rate that follows the process of destabilization of austenite, perlite, bainite and martensite may form. The present work, aimed at studying the influence of cooling rate after heat treatment, on the microstructure and hardness. The study were carry out on samples of High Chromium Cast Iron containing 27%Cr i 2,7%C. Samples were subjected to the tempering treatment at the temperature of 950°C for 4 hours and three variants of cooling – in water, in a salt bath and on air. Examined and compared the microstructure and hardness of castings for different variants of cooling.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4 spec.; 109-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of thermo-derivative analysis conditions on microstructure of the Al-Si-Cu alloy
Autorzy:
Dobrzański, L. A.
Krupiński, M.
Labisz, K.
Rdzawski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/380745.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium alloy
thermo derivative analysis
UMSA
alloy microstructure
mechanical properties
stop aluminium
analiza termopochodna
mikrostruktura stopu
właściwości mechaniczne
Opis:
Microstructure change of the metals and alloys as a result of variable crystallisation conditions also by mind of cooling rate change influence the mechanical properties. In this work there are presented the interdependences between the cooling rate, chemical composition and microstructure of the cast aluminium alloy Al–Si–Cu as a result of the thermo-derivative analysis, using the UMSA (Universal Metallurgical Simulator and Analyzer) device. An important tool for the microstructure evaluation of the Al type AC-AlSi7Cu3Mg alloy was the light and electron scanning microscopy technique.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 19-22
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Microstructure of Thin-walled GX2CrNiMoN25-6-3 Cast Steel Made by Centrifugal Casting
Autorzy:
Stradomski, G.
Nadolski, M.
Stradomski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/383192.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
duplex cast steel
centrifugal casting technology
alloy microstructure
staliwo typu duplex
odlewanie odśrodkowe
mikrostruktura stopu
Opis:
The paper presents the results of investigation into the technological possibility of making light-section castings of GX2CrNiMoN25-6-3 cast steel. Due the fact that the GX2CrNiMoN25-6-3 duplex cast steel has a complex microstructure authors of this paper took on its analysis. For making castings with a wall thickness in the thinnest place as small as below 1 mm, the centrifugal casting technology, as it was presented in the paper [1], is one of the most effective technology. In the paper was made the analysis of four different parameters of the casting process and different parameters of heat treatment.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 77-82
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zabiegu modyfikowania zaprawą ZnTi3,2 na mikrostrukturę stopu ZnAl10
Influence of the Modification by ZnTi3,2 Grain-Refiner on the ZnAl10 Alloy Microstructure
Autorzy:
Piwowarski, G.
Buraś, J.
Krajewski, W. K.
Powiązania:
https://bibliotekanauki.pl/articles/381412.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stop cynku
rozdrabnianie ziarna
modyfikacja stopu
analiza termiczna
mikrostruktura stopu
zinc alloy
grain refining
modification of alloy
thermal analysis
alloy microstructure
Opis:
Publikacja dotyczy zabiegu modyfikowania podwójnych stopów Zn o średniej zawartości aluminium dodatkiem zaprawy zawierającej tytan i obejmuje badania wpływu zabiegu modyfikowania na stopień rozdrobnienia mikrostruktury stopu Zn-10% mas. Al (ZnAl10) odlewanego do formy piaskowej. Badany stop został rozdrabniany zaprawą modyfikującą Zn – 3,2% mas. Ti, wprowadzającą do metalu Ti. Na podstawie dokonanej oceny obrazów mikrostruktury stopu wyjściowego niemodyfikowanego i zmodyfikowanego zmiennym dodatkiem Ti zawartego w zaprawie modyfikującej stwierdzono, że zastosowana zaprawa modyfikująca powoduje określone, w zależności od ilości wprowadzonego do stopu Ti, rozdrobnienie ziarna stopu w stosunku do stopu wyjściowego niemodyfikowanego. Z kolei wyniki uzyskane w przeprowadzonej analizie termicznej potwierdzają zarodkotwórcze działanie użytej do badań zaprawy.
The paper deals with grain-refinement of the sand-cast binary medium-aluminium Zn-10 mas. % alloy (ZnAl10) by using the Zn-3.2 mas. %Ti master alloy. Basing on the structure analysis it was stated that the master alloy causes significant grain-refinement in comparison with the initial, no modified alloy. Thermal analysis of the cooling curves stated that the modified alloys had increased nucleation temperatures and, at the same time, decreased recalescence – which proves nucleating action of the Zn-3.2 mas. %Ti master alloy in the examined alloy.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 129-132
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of heat treatment parameters for heavily - loaded aircraft engine components
Autorzy:
Rokicki, P.
Dychtoń, K.
Nowotnik, A.
Drajewicz, M.
Sieniawski, J.
Kurkowski, D.
Wierzbińska, M
Jakubowicz, G.
Budzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/243068.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft engine components
vacuum carburizing
heat treatment
quenching
alloy steel microstructure
Opis:
Gears, due to their complex shape, carried load and required accuracy are ones of most complex aircraft engine parts. Single tooth damage usually breaks the power transmission and causes failure of the entire gear system. Adequate sustainability and guarantees of transmission is therefore a condition for secure operation of whole device. Particularly high requirements for reliability are put to transmissions used in the aerospace industry. Due to the loads which are transmitted through the gears, the materials used by the manufacturer must have not only high strength but also show the abrasion resistance of the surface layer and the ductility of the core. Proper parameters matching allows to create an element that can operate at higher stresses and loads. In addition, factor strength and abrasion resistance of the surface layer has a significant impact on the life of the gear. Thermo-chemical treatment of industrial gears is a fundamental process, which gives them adequate mechanical properties regarding loads they carry and the surface conditions of work. Among many methods of thermo-chemical treatment used in the industry, the most distinctive are innovative technologies designed to reduce process costs and being more environmentally friendly. The most promising methods in the discussed field are vacuum carburizing and high-pressure hardening, which by their specification of work significantly reduce the emission of CO2 and the duration of the process, without reducing the quality of the final product. The main aim of the paper is to present criteria for selection of heat treatment parameters as a part of thermo-chemical treatment process performed using vacuum methods. Proper heat treatment parameters are crucial in programming of some of final material characteristics as grain size and retained austenite morphology.
Źródło:
Journal of KONES; 2013, 20, 2; 349-354
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of AlSi skeleton castings
Autorzy:
Cholewa, M.
Szuter, T.
Powiązania:
https://bibliotekanauki.pl/articles/382849.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlew szkieletowy
masa formierska
rdzeń
stop aluminium
skeleton casting
moulding sand
core
microstructure aluminum alloy
Opis:
Skeleton castings macrostructure can be shaped in many ways, by choosing an appropriate material of cores and manufacturing technologies. Important factor, which puts foundry techniques over the other technologies of periodic cellular materials, is ability to adjust mechanical properties by changing the microstructure of an alloy from which the casting is made. The influence on the microstructure of the skeleton casting can be implemented by choosing the thermal properties, mainly thermal conductivity factor, of mould and core materials. Macro- and microstructure of skeleton castings with octahedron elementary cells was presented in this paper. The analysis concerns the differences in morphology of eutectic silicone depending on the location of measurements cross sections areas. The use of thermo-insulating material with appropriate properties assures correct fill of mould cavity and homogeneous microstructure on whole volume of skeleton casting. The selection of technological parameters of the casting process if very important as well.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 147-152
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Life and Microstructure after Multiple Remelting of A359 Matrix Composites Reinforced with SiC Particles
Autorzy:
Klasik, A.
Maj, M.
Pietrzak, K.
Wojciechowski, A.
Sobczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/352210.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy
composite
microstructure
properties
recycling
Opis:
The article presents the results of fatigue life tests and microstructure examinations of A359 alloy matrix composites (F3S.10S and F3S.30S) containing 10 and 30wt% of SiC particles, subjected to multiple remelting by conventional gravity casting. Mechanical characteristics were determined in a modified low cycle fatigue (MLCF) test, enabling rapid estimation of fatigue life and other mechanical parameters in practice of any material. Qualitative and quantitative metallographic examinations were also carried out. The quantitative evaluation of microstructure was performed by computer image analysis. A set of geometrical parameters of the reinforcing particles, pores and eutectic precipitates present in the metal matrix was determined. The relationships between the mechanical parameters, structural characteristics and the number of remelting operations were presented. It was found that up to the fourth remelting, the mechanical characteristics, including fatigue life, are slightly deteriorated but decrease gradually in the subsequent operations of remelting. The observed effect is mainly due to the shrinkage porosity occurring as a result of gravity casting. To eliminate this defect, the use of squeeze casting process was recommended. It has also been shown that multiple remelting can be an easy and economically well-founded alternative to other more expensive recycling methods.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2123-2128
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sb-Modification on the Microstructure and Mechanical Properties of Secondary Alloy 319
Autorzy:
Medlen, D.
Bolibruchova, D.
Powiązania:
https://bibliotekanauki.pl/articles/357012.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy 319
secondary alloy
microstructure
mechanical properties
modification
antimony
Opis:
319 alloy has been selected for the study in the present work due to its wide use in many applications. 319 alloy is used in automotive and aerospace industry for the complicated castings which must comply high strength requirements. In practice, the most common elements with the modifying effect are strontium, sodium and antimony. The addition of these elements leads to a change in the shape of eutectic silicon, resulting in an increase of the mechanical characteristics and the microstructure. An experimental program has been undertaken to explore the effect of antimony on chosen mechanical properties and the microstructure of investigated alloy. An analysis of the results of these experimental works is made in order to determine an optimum Sb (Al-10% Sb) addition to produce material exhibiting desirable properties. Experimental works have showed that the addition of the Al-10% Sb results in similar or even higher mechanical properties than the conventional 319 alloy. Based on the carried out experiments the best combination of mechanical properties has been achieved by the addition of 2 000 ppm Al-10% Sb.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 553-558
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Solution Heat Treatment on Phase Composition and Structure of ZnAl40Cu(1-2)Ti(1-2) Alloys
Autorzy:
Michalik, R.
Powiązania:
https://bibliotekanauki.pl/articles/352321.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Zn-Al alloy
microstructure
phase composition
Opis:
Zn-Al-Cu alloys are characterised by very good tribological properties: high resistances to abrasive wear and adhesive wear, resistance to dry friction, low friction coefficient. Important disadvantages of Zn-Al alloys include, among others low structural and dimensional instability in as-cast stage and during long-period after pouring into moulds. Studies carried out in recent years confirm the problem of dimensional instability of Zn-Al-Cu alloys may be reduced by replace copper partially with titanium. The goal of the studies carried out was to define the influence of heat treatment on the microstructure and phase composition of ZnAl40Cu(1-2)Ti(1-2) alloys. The scope of the investigations included analysis of the phase composition, tests using a scanning electron microscope and a scanning transmission electron microscope, and X-ray microanalysis. The studies carried out indicate a presence of the e-CuZn5 and Ti2ZnAl5, AlxCuyTiz phases in the ZnAl40Cu(1-2)Ti(1-2) alloys.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 461-466
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of TIG Surfacing Co-Based Alloy on UMCo50 Process Burner
Autorzy:
Xue, Haitao
Luan, Xiaoping
Guo, Weibing
Zhou, Dong
Powiązania:
https://bibliotekanauki.pl/articles/2048805.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
UMCo50 alloy
surfacing
microstructure
properties
Opis:
The surfacing layer of cobalt-based alloy is prepared using the tungsten inert gas welding (TIG) process and employing the UMCo50, ST1 and ST6 filler materials. The metallographic testing, hardness, wear and corrosion testing of different surfacing layers have been carried out. Each area of the surfacing layer is characterized using the optical and scanning electron microscope (SEM). Cellular and a few columnar dendrites have been observed near the fusion line of the UMCo50 surfacing layer, and cellular structure is observed in the central region. Dendrites and cellular crystals have been observed in the ST1 and ST6 surfacing layers. The average hardness of UMCo50, ST1 and ST6 surfacing layers are 320 HV, 672.3 HV and 497.5 HV, respectively. The wear loss of the ST1, ST6 and UMCo50 surfacing layer is 2.71 mg, 4.35 mg, and 14.57 mg, respectively. The corrosion weight loss of the ST1, ST6 and UMCo50 surfacing layers are 0.0388 g, 0.0477 g and 0.0833 g, respectively.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 17-30
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of Hot-Deformed Cu-3Ti Alloy
Autorzy:
Szkliniarz, A.
Szkliniarz, W.
Blacha, L.
Siwiec, G.
Powiązania:
https://bibliotekanauki.pl/articles/352283.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper-titanium alloy
hot deformation
microstructure
recrystallization
Opis:
In the paper, results of investigations regarding temperature and strain rate effects on hot-deformed Cu-3Ti alloy microstructure are presented. Evaluation of the alloy microstructure was performed with the use of a Gleeble HDS-V40 thermal-mechanical simulator on samples subjected to uniaxial hot compression within 700 to 900ºC and at the strain rate of 0.1, 1.0 or 10.0 s-1 until 70% (1.2) strain. It was found that within the analyzed temperature and strain rate ranges, the alloy deformation led to partial or complete recrystallization of its structure and to multiple refinement of the initial grains. The recrystallization level and the average diameter of recrystallized grains increase with growing temperature and strain rate. It was shown that entirely recrystallized, fine-grained alloy structure could be obtained following deformation at the strain rate of min 10.0 s-1 and the temperature of 800°C or higher.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 347-352
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Whisker-Like Formations in Sn-3.0Ag-Pb Alloys
Autorzy:
Koncz-Horváth, D.
Gergely, G.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351400.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Sn-Ag alloy
soldering
whisker formation
microstructure analysis
Opis:
In this study, different types of whisker-like formations of Sn-3.0Ag based alloy were presented. In the experimental process the amount of Pb element was changed between 1000 and 2000 ppm, and the furnace atmosphere and cooling rate were also modified. The novelty of this work was that whisker-like formations in macro scale size were experienced after an exothermic reaction. The whiskers of larger sizes than general provided opportunities to investigate the microstructure and the concentration nearby the whiskers. In addition, the whisker-like formations from Sn-Ag based bulk material did not only consist of pure tin but tin and silver phases. The whisker-like growth appeared in several forms including hillock, spire and nodule shaped formations in accordance with parameters. It was observed that the compound phases were clustered in many cases mainly at hillocks.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1027-1031
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Mechanical Properties of as Cast Al-6.5Mg-1.5Zn-0.5Fe Alloy Followed by Cold Rolling and Subsequent Annealing
Autorzy:
Lee, Seong-Hee
Powiązania:
https://bibliotekanauki.pl/articles/356133.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
cold rolling
annealing
microstructure
mechanical properties
Opis:
Microstructures and mechanical properties of as-cast Al-6.5Mg-1.5Zn-0.5Fe alloys newly alloy-designed for the parts of automobile were investigated in detail. The aluminum (Al) sheets of 4 mm thickness, 30 mm width and 100 mm length were reduced to a thickness of 1 mm by multi-pass rolling at ambient temperature and subsequently annealed for 1h at 200~500°C. The as-cast Al sheet was deformed without a formation of so large cracks even at huge rolling reduction of 75%. The recrystallization begun to occur at 250°C, it finished at 350°C. The as-rolled material showed tensile strength of 430 MPa and tensile elongation of 4.7%, however the specimen after annealing at 500°C showed the strength of 305 MPa and the elongation of 32%. The fraction of high angle grain boundaries above 15 degree increased greatly after annealing at high temperatures. These characteristics of the specimens after annealing were discussed in detail.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 875-878
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Heat Treatment on the Microstructure Evolution and Properties of an Age-Hardened Cu-3Ti-2Mg Alloy
Autorzy:
Liu, Jituo
Wang, Xianhui
Liu, Jia
Ran, Qianni
Powiązania:
https://bibliotekanauki.pl/articles/2049425.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu alloy
aging treatment
microstructure
precipitation
electrical conductivity
Opis:
The study investigates the effect of heat treatment on the microstructure evolution and properties of an age-hardened Cu-3Ti-2Mg alloy. The precipitated Cu2Mg and β'-Cu4Ti phases consequently yield a depletion of the Cu matrix in regards to Ti and Mg solutes, which enhances the electrical conductivity. The Cu2Mg Laves phase and β'-Cu4Ti phase precipitates increase the hardness of the alloy due to the consistency and coherency of the later phase. However, the decrease of hardness is mainly associated with the coarse microstructures, that can be formed due to the phase transformation from metastable β'-Cu4Ti phase to more stable Cu3Ti phase. In the range of experiments, the optimum process is solution treatment at 700°C for 4 h, with subsequent age-hardening at 450°C for 4 h. The electrical conductivity, hardness, tensile strength, and elongation of the Cu-3Ti-2Mg alloy were 15.34 % IACS, 344 HV, 533 MPa, and 12%, respectively.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 163-170
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
The Design of Ti-5Al-5Mo-5V-3Cr Elemental Powders Mixture Processing
Autorzy:
Zyguła, K.
Wojtaszek, M.
Powiązania:
https://bibliotekanauki.pl/articles/352015.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloy
powder metallurgy
microstructure
mechanical properties
compaction
Opis:
The aim of the study was to indicate the influence of consolidation processes on microstructure and selected mechanical properties of powder metallurgy Ti-5Al-5Mo-5V-3Cr alloy, which was produced by blending of elemental powders method. Morphology of the mixture and its ingredients were examined using scanning electron microscopy. The consolidation of powders mixture was conducted using two approaches. The first consisted of the uniaxial hot pressing process, the second included two steps – uniaxial cold pressing process and sintering under argon protective atmosphere. Microstructural analysis was performed for both as-pressed compacts using light microscopy. Additionally, computed tomography studies were carried out, in order to examine the internal structure of compacts. Chosen mechanical properties, such as Vickers hardness and compression strength was also determined and compared. The conducted research proves that the proposed production method leads to obtain materials with no structural defects and relatively low porosity. Moreover, due to the proper selection of manufacturing parameters, favorable microstructures can be received, as well as mechanical properties, which are comparable to conventionally produced material with the corresponding chemical composition.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 283-289
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of microstructure and properties of Cu-3Ti alloy in thermal and thermomechanical processes
Autorzy:
Szkliniarz, A.
Powiązania:
https://bibliotekanauki.pl/articles/355778.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper-titanium alloy
microstructure
thermal and thermomechanical processes
Opis:
This paper presents the possibilities of forming the microstructure as well as mechanical properties and electrical conductivity of Cu-3Ti alloy (wt.%) in thermal and thermomechanical processes that are a combination of homogenising treatment, hot and cold working, solution treatment and ageing. Phase composition of the alloy following various stages of processing it into the specified semi-finished product was being determined too. It was demonstrated that the application of cold plastic deformation between solution treatment and ageing could significantly enhance the effect of hardening of the Cu-3Ti alloy without deteriorating its electrical conductivity. It was found that for the investigated alloy the selection of appropriate conditions for homogenising treatment, hot and cold deformation as well as solution treatment and ageing enables to obtain the properties comparable to those of beryllium bronzes.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 223-230
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Functional Properties of Prosthetic Cobalt Alloys CoCrW
Mikrostruktura i właściwości użytkowe protetycznych stopów kobaltu CoCrW
Autorzy:
Nadolski, M.
Golański, G.
Klimas, J.
Szota, M.
Szymański, J.
Powiązania:
https://bibliotekanauki.pl/articles/355916.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cobalt alloy
microstructure
properties
stopy kobaltu
mikrostruktury
właściwości
Opis:
The material subject to investigation was two commercial alloys of cobalt CoCrW (No. 27 and 28) used in prosthodontics. The scope of research included performing an analysis of microstructure and functional properties (microhardness, wear resistance and corrosion resistance), as well as dilatometric tests. The examined alloys were characterized by diverse properties, which was considerably influenced by the morphology of precipitates in these materials. Alloy No. 27 has a higher corrosion resistance, whereas alloy No. 28 shows higher microhardness, better wear resistance and higher coefficient of linear expansion. Lower value of the expansion coefficient indicates less probability of initiation of a crack in the facing ceramic material.
Badaniu poddano dwa komercyjne stopy kobaltu CoCrW (nr 27 i 28) stosowane w protetyce stomatologicznej. Zakres badań obejmował przeprowadzenie analizy mikrostrukturalnej, właściwości użytkowych (mikrotwardość, odporność na ścieranie i odporność korozyjna) oraz badania dylatometryczne. Badane stopy charakteryzowały się zróżnicowanymi właściwościami na co zasadniczy wpływ miała morfologia wydzieleń w tych materiałach. Stop nr 27 posiada wyższą odporność korozyjną natomiast stop nr 28 wykazuje: wyższą mikrotwardość, lepszą odporność na ścieranie oraz niższy współczynnik rozszerzalności liniowej. Niższa wartość współczynnika rozszerzalności liniowej wskazuje na mniejsze prawdopodobieństwo inicjacji pęknięcia licującego materiału ceramicznego.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 1999-2003
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Evolution and Oxidation Behavior of Fe-4Cr-6Ti Ferritic Alloy with Fe2Ti Laves Phase Precipitates
Autorzy:
Demirel, Ahmet
Çetin, Emre Can
Karakuş, Ali
Ataş, Mehmet Şahin
Yildirim, Mehmet
Powiązania:
https://bibliotekanauki.pl/articles/2125526.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ferritic alloy
microstructure
precipitation hardening
laves phase
oxidation
Opis:
The microstructural properties and hardness of a model ternary Fe-4Cr-6Ti ferritic alloy aged at 800°C for 8, 16 and 24 h are investigated in detail. Fine Fe2Ti Laves phase particles precipitate in the α-Fe (ferrite) matrix phase after solutionizing and subsequent aging treatments. The size and amount of Fe2Ti precipitates gradually increase with increasing aging time. The magnetic measurements of the aged samples confirm the variations in the microstructural properties including the volume fraction of the constituent phases, and Ti content of the α-Fe matrix phase. The mean Vickers microhardness value also increases from 203.5 to 238.4 with increasing aging time from 8 to 24 h. In addition, the cyclic oxidation behavior of 24 h aged sample, which contains maximum amount of Fe2Ti precipitates, is also investigated in detail. X-ray diffraction analysis reveals that scale product is α-Fe2O3 (hematite). Significant scale spallation and void formation is observed on the surfaces of 24 h aged Fe-4Cr-6Ti sample oxidized at 500°C.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 827--836
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Conditions on the Tensile Properties of AA7075-T6 During the Friction Stir Welding Process
Autorzy:
Sharma, Akash
Dwivedi, Vijay Kumar
Singh, Yesh Pal
Powiązania:
https://bibliotekanauki.pl/articles/28099543.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
tensile strength
aluminum alloy 7075
Taguchi Technique
microstructure
FSW
Opis:
In this paper the investigation of the FSW result characteristics on AA7075-T6 of the highest grade is carried out using different process parameters. A vertical milling machine with different FSW tool geometry is used to weld AA7075. When the tool rotational speed varies from 1200 and 1800 (rpm), different welding parameters are studied, the plunge depth of tool is between 0.14 and 0.20 mm, the table transverse speed range is between 20 and 50 (mm/min) and the tool shoulder diameter was 20 mm. The welding settings are optimized using the Taguchi approach. In this experimental investigation Taguchi Technique is utilized in this study to optimize three factorial and three level designs. The results show that when the rotating speed increases, the UTS of the welded joint increases, whereas the tensile strength of the welded joint decreases resulting to frictional heat created during the FSW process. Tensile strength decreases as feed increases and increases as rotational speed increases. For a 5 mm thick plate, tensile strength is optimal with a tool shoulder diameter of 20 mm, a rotational speed of 1600 rpm, feed rate of 30 mm/min and plunge depth. The shoulder diameter of 20 mm provides the maximum ultimate tensile strength when it is compared with all other tool shoulder diameter. The Al alloy AA7075-T6 plates, however, concurrently developed an equiaxial grain structure with a substantially smaller grain size and coarsened the precipitates.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 813--821
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Laser Cladding of WC/T-800 Cermet: Fabrication, Microstructure and Wear Properties
Autorzy:
Kim, Kyoung-Wook
Kim, Young-Kyun
Park, Sun-Hong
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/2049250.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CoMoCr alloy
WC
cermet
laser cladding
microstructure
wear properties
Opis:
This study fabricated a WC/T-800 cermet coating layer with Co-Mo-Cr (T-800) powder and WC powder using laser cladding, and analyzed its microstructure, hardness and wear properties. For comparison, casted bulk T-800 was used. Laser cladded WC/T-800 cermet coating layer showed circular WC phases in the Co matrix, and dendritic laves phases. The average laves phase size in the cermet coating layer and bulk T-800 measured as 7.9 µm and 60.6 µm, respectively, indicating that the cermet coating layer had a relatively finer laves phase. Upon conducting a wear test, the cermet coating layer added with WC showed better wear resistance. In the case of laser cladded WC/T-800 cermet coating layer, abrasion wear was observed; on the contrary, the bulk T-800 showed pulled out laves phases. Based on the above findings, the WC/T-800 cermet coating layer using laser cladding and the relationship between its microstructure and wear behavior were discussed.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 713-717
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing Treatment on (Mg17Al12) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy
Autorzy:
Abass, Marwa H.
Abdulkareem, Makarim H.
Hussein, Hussien A.
Powiązania:
https://bibliotekanauki.pl/articles/2201907.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AZ91
alloy
heat treatment
corrosion
microstructure
antibacterial
hardness
Opis:
Heat treatment is the most suitable technique for altering the microstructure and, consequently, it is possible to create the optimal balance of corrosion resistance and mechanical strength in a material by carefully regulating the conditions during the heating process. The present work aims to investigate the effect of heat treatments (annealing) at (300°C) at different times (10, 20, and 30 hr) on the magnesium alloy. How the Mg17Al12 phase influences the corrosion behavior of AZ91D magnesium alloy was quantified in different solution (SBF, Lactic and Ringer). It was able to construct an extensive range of Mg17Al12 phase volume fractions by varying the annealing period. The corrosion potential of many specimens with varied proportions of the Mg17Al12 phase was evaluated. The results of the conducted tests manifested that the material's resistance to corrosion greatly improved with an increase in the volume fraction of Mg17Al12 phase. The effect of heat treatment on the microstructure was analyzed using transmission electron microscopy and X-ray diffraction. The SEM photographs evinced that the amount of β-Mg17Al12 phase decreased significantly, with the distribution occurring at the grain boundaries and with increasing the time of annealing, resulting in a highly saturated α-grain. The XRD validated the all material peaks of phases that are present. The corrosion test behavior of AZ91 alloy in the simulated body fluid (SBF), lactic, and Ringer solutions was investigated through electrochemical measurements, the result was elucidated as measured along the Tafel slope, and the corrosion current density of all heat treated samples was lower than that of the as-cast sample. The measurement of hardness (HV) demonstrated that the hardness decreased to (64.5 HV0.5) during the heat treatment. The result antibacterial efficiency was revealed that AZ91 at 30 hr was best then as cast against the bacteria E.coli.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 330--341
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 167

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