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Tytuł:
Selected tribological parameters for silumin alloy used for engine piston
Autorzy:
Kozuba, J.
Wieszała, R.
Mendala, J.
Roszak, M.
Pakieła, W.
Powiązania:
https://bibliotekanauki.pl/articles/2175806.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
tribology
piston engines
coefficient of friction
tribologia
silniki tłokowe
współczynnik tarcia
Opis:
Purpose: The conducted tests were aimed at determining whether the tested material meets the requirements for wear resistance in modern turbocharged combustion engines where there is an increased temperature and higher pressure. Design/methodology/approach: The tests were performed in a pin-on-disc system, according to the ASTM G 99 standard. Findings: The article presents the results of the coefficient of friction, the amount of wear, chemical analysis and surface profile of the tested material A390.0 in combination with EN GJL-350 cast iron. Research limitations/implications: The tested materials are used in the construction of pistons for internal combustion engines, therefore the test parameters were selected to take into account the operating conditions in a turbocharged engine with a power of up to 100 kW. Practical implications: After analysing the properties of the A390.0 alloy at elevated temperatures, it was found that without additional modifications, the alloy cannot be used in modern combustion engines, in particular with turbocharging. Originality/value: Presents the results of research concerning mechanical properties (HB, HV, Rm) and yield properties (R0.2, A5, Z) of the examined alloy.
Źródło:
Archives of Materials Science and Engineering; 2021, 107, 2; 64--71
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of parameters of high-pressure die casting on occurrence of casting nonconformities in sleeves of silumin alloy EN AB 47100
Autorzy:
Pałyga, Ł.
Stachowicz, M.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/352331.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-pressure die casting
casting nonconformities
structure
silumin
microhardness
Opis:
The paper presents a research on the effect of extreme - for the technology of the considered silumin EN AB 47100 - parameters of high-pressure die casting on occurrence of casting nonconformities. Considered was influence of the way of assembling the mould cooled-down to 140-160°C, non-standard for the selected casting, and pouring temperature in the range of 705 to 720°C (higher than the recommended) of non-refined alloy. The castings were prepared with use of a high-pressure casting machine made by Kirov with mould closing force of 2500 kN. Occurrence of nonconformities was evaluated on properly prepared specimens taken from the castings manufactured with various parameters of the injection piston and various multiplication pressures. The results were subjected to quantitative and qualitative analyses of casting nonconformities and distribution of major alloying elements. It was found that proper selection of working parameters of the casting machine, in spite of disadvantageous pouring conditions, makes it possible to reduce occurrence of some casting defects, like shrinkage cavities and porosity, to improve tightness of castings even when the alloy refining process is omitted.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 373-378
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Modification on the Structure and Morphology of Fracture of AlSi13Mg1CuNi
Autorzy:
Romankiewicz, R.
Romankiewicz, F.
Powiązania:
https://bibliotekanauki.pl/articles/382101.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silumin alloy
alloy modification
fracture
silumin
modyfikacja stopu
pękanie
Opis:
The investigation revealed that the modification of the AlSi13Mg1CuNi silumin with the additives 0,25% AlSr10 and AlCu19P1,4 simultaneously provided the change of the morphology of eutectic silicon from the lamellar into the fibrous one. The change resulted in a double increase in the impact resistance of the alloy and the widening of the plastic area of the fracture of the silumin samples.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2 spec.; 85-88
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heuristic Model of the Mechanical Properties of a Hypoeutectic EN AC-42100 (EN AC-AlSi7Mg0.3) Silumin Alloy Subjected to Heat Treatment
Autorzy:
Górny, Z.
Kluska-Nawarecka, S.
Czekaj, E.
Wilk-Kołodziejczyk, D.
Saja, K.
Powiązania:
https://bibliotekanauki.pl/articles/383182.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information technology
application of information technology
foundry industry
silumin alloy
mechanical properties
heat treatment
fuzzy logic
artificial intelligence
technologie informatyczne
zastosowanie technologii informatycznych
przemysł odlewniczy
silumin
właściwości mechaniczne
obróbka cieplna
sztuczna inteligencja
Opis:
The object of the experimental studies was to determine the mechanical properties of a hypoeutectic EN AC - 42100 (EN ACAlSi7Mg0,3) silumin alloy, where the said properties are changing as a result of subjecting the samples of different types to solution treatment. An important aspect of the studies was the use type of device for the heat treatment. As a basic parameter representing the mechanical properties, the tensile strength of the metal (Rm) was adopted.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure of the silumin coat on alloy cast steels
Autorzy:
Szymczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/382899.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
powłoka zanurzeniowa
staliwo stopowe
silumin
innovative casting technologies
dip coating
alloy cast steel
Opis:
The work presents the analysis results of the structure of the coat obtained by dipping in silumin AlSi5 of two grades of alloy cast steel: GX6CrNiTi18-10 (LH18N9T) and GX39Cr13 (LH14). The temperature of the silumin bath was 750-5 C, and the hold-up time of the cast steel element [...] = 180 s. The absolute thickness of the coat obtained in the given conditions was g = 104 [...] on cast steel GX6CrNiTi18-10 and g = 132 [...] on GX39Cr13. The obtained coat consisted of three layers of different phase structure. The first layer from the base [...] was constructed of the phase AlFe including Si and alloy additives of the tested cast steel grades: Cr and Ni (GX6CrNiTi18-10) and Cr (GX39Cr13). The second layer [...] of intermetallic phases AlFe which also contains Si and Cr crystallizes on it. The last, external layer 'g2' of the coat consists of the silumin containing the intermetallic phases AlFeSi which additionally can contain alloy additives of the cast steel. It was shown that there were no carbides on the coat of the tested cast steels which are the component of their microstructure, as it took place in the case of the coat on the high speed steels.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 215-220
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The silumin coat structure on alloy ductile iron
Autorzy:
Szymczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/383363.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
żeliwo sferoidalne
silumin
innovative casting technologies
dip coats
alloy ductile iron
Opis:
The work presents the research results of the silumin coat structure applied on the carbidic alloy ductile iron with the metal matrix: pearlitic, bainitic and martensitic. The coats were made in the AlSi5 silumin bath at the temperature tk = 750±5ºC. The holding time of cast iron element in the bath was \tau = 180s. Irrespective of the kind of tested ductile iron the obtained coat consisted of three layers with a different phase composition. The first layer from the cast iron ground “g1” is built from Fe4CSi carbide which contains selected alloy additives of the cast iron. On it the second layer “g1” crystallizes. It consists of the AlFeSi inter-metallic phase which can appear in its pure form or contain a small quantity of the alloy additives of the cast iron. The last external part of the layer “g2” mainly consists of the hypo-eutectic phases of silumin. The AlFeSi inter-metallic phases in the form of free precipitations with a lamellar or faceted morphology can also appear there. These phases also can contain a small quantity of the alloy additives of the cast iron. More than that, in all the layers of the coat there are graphite precipitations. The phenomenon of graphite movement to the coat is caused by intensive dissolving of the cast iron element surface by the aluminum of the silumin bath.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1; 119-124
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the selected technological factors on the quality of bimetallic castings alloy steel-silumin
Autorzy:
Szymczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/382607.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting technology
bimetallic casting
alphinizing
alloy steel
silumin
innowacyjna technologia odlewnicza
odlew bimetaliczny
alfinowanie
stal stopowa
Opis:
The work presents the research results of the influence of the selected technological factors on the improvement of bimetallic castings alloy steel-silumin. The following alloy steel grades were used for the research: X6CrNiTi18-10, X39Cr13 and HS6-5-2. The sets of the mentioned steel grades were alphinated in silumin AlSi5 and were poured with this silumin or complex silumin AlSi5Ni5Cu4MgCrMoWV into the casting mold obtaining bimetallic castings as a result. Moreover, the following technological factors of the process of bimetallic casting production were analyzed: the time from removing of the set from the alphinizing bath till pouring it with the silumin into the casting mold “τp”, the temperature of the initial heating of the casting mold “t2,0” and the temperature of the silumin for pouring of the casting mold “tz”. It follows from the presented results that the best connecting quality of the analyzed castings is obtained when using: the possible short time “τp” and low temperature values “t2,0” and “tz”.
Źródło:
Archives of Foundry Engineering; 2011, 11, 3 spec.; 215-226
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of heat treatment aimed to spheroidization of eutectic silicon for silumin castings produced by squeeze casting
Autorzy:
Vanko, B.
Stanček, L.
Powiązania:
https://bibliotekanauki.pl/articles/382481.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obróbka cieplna
prasowanie stopu
stop aluminium
heat treatment
silicon spheroidization treatment
direct squeeze casting
hypoeutectic aluminium alloy
Opis:
This paper describes the possibility of using very short periods of solution annealing in the heat treatment of unmodified hypoeutectic silumin alloy AlSi7Mg0,3 casted by method of casting with crystallization under pressure with forced convection (direct squeeze casting process). Castings prepared at different casting parameters were subjected to special heat treatment called SST (Silicon Spheroidization Treatment), which were originally used only for the modified silumin alloys to spheroidization of eutectic silicon. Temperature holding time in solution annealing of T6 heat treatment is limited in the SST process to only a few minutes. It was studied the effect of casting parameters and periods of solution annealing on ultimate strength, yield strength, and especially ductility that in the unmodified silumin alloy castings is relatively low.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1; 111-114
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Heat Treatment on Abrasive Wear Resistance of Silumin Matrix Composite Castings
Autorzy:
Gawdzińska, K.
Bryll, K.
Nagolska, D.
Powiązania:
https://bibliotekanauki.pl/articles/352168.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal composite castings
thermal treatment
tribology
aluminium alloy
Opis:
The authors attempted at examining the effect of heat treatment on abrasive wear resistance of metal composite castings. Metal matrix composites were made by infiltrating preforms created from unordered short fibers (graphite or silumin) with liquid aluminium alloy AlSi12(b). Thus prepared composites were subject to solution heat treatment at a temperature of 520°C for four hours, then aging at a temperature of 220°C for four hours. Abrasion resistance of the material was tested before and after thermal treatment.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 177-182
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into morphology and phase structure in the surface of Al-Si alloy modified by yttrium oxide
Autorzy:
Zagulyaev, D.
Konovalov, S.
Gromov, V.
Melnikov, A.
Shlyarov, V.
Powiązania:
https://bibliotekanauki.pl/articles/201477.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silumin
microstructure
electroexplosive alloying
yttrium oxide
mikrostruktura
tlenek itru
Opis:
Using methods of physical material studies (scanning electron microscopy and micro X-ray spectral analysis), a study was carried out with focus on alteration of structure and phase composition in surface layers of Al-Si alloy (silumin АК10М2N) treated in electroexplosive alloying with a multiphase plasma jet formed in the process of aluminum foil explosion and carrying particles of Y2O3 weighted powder portion. It was revealed that a porous surface layer with non-homogeneously distributed alloying elements (silicon, yttrium) in it is formed in any conditions of electroexplosive alloying of silumin. Thickness of the modified layer is different, varying 50 to 160 μm, depending on the zone to be examined. The modified surface consists basically of Al, Si and Y. Yttrium in the modified layer is thought to be an indirect evidence of better physical and mechanical properties of the surface layer in comparison with the base material.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 173-177
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion of Al-Si Alloy Structure by Intensive Pulsed Electron Beam
Autorzy:
Konovalov, S.
Gromov, V.
Zaguliyaev, D.
Ivanov, Y.
Semin, A.
Rubannikova, J.
Powiązania:
https://bibliotekanauki.pl/articles/381713.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silumin
structure Al-Si
electron beam processing
crystallization cells
dispersion
struktura Al-Si
obróbka wiązką elektronową
krystalizacja
dyspersja
Opis:
By the method of modern physical material science (optic microscopy scanning and transmission electron microscopy) the analysis of structural phase states, the morphology of the second phase inclusions and defect substructure of Al-Si alloy (silumin) of hypoeutectic composition, subjected to electron beam processing was done with the following parameters: energy density 25-35 J/cm2, beam length 150 μs, pulse number – 3, pulse repetition rate – 0.3 Hz, pressure of residual gas (argon) 0.02 Pa. The surface irradiation results in the melting of the surface layer, the dissolution of boundary inclusions, the stricture formation of high speed cellular crystallization of submicron sizes, the repeated precipitation of the second phase nanodimentional particles. With the increased distance from the irradiation surface the layer containing the second phase inclusions of quasi-equilibrium shape along with the crystallization cells was revealed. It is indicative of the processes of Al-Si alloy structure globalization on electron beam processing.
Źródło:
Archives of Foundry Engineering; 2019, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Water Mist Cooling on Microstructure of Hypereutectic Al-Si Alloy
Autorzy:
Władysiak, R.
Kozuń, A.
Powiązania:
https://bibliotekanauki.pl/articles/382973.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative foundry materials
casting die cooling
water mist
hypereutectic silumin
microstructure
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
chłodzenie
silumin nadeutektyczny
mikrostruktura
Opis:
The work is a continuation of research on the use 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 of crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified AlSi20 alloy and modified 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 allows the formation of the microstructure of hypereutectic silumins. A wide range of solidification temperature of hypereutectic silumins increases the potential impact of changes in the cooling rate on a size, a number and a morphology of preeutectic silicon and eutectic α+β (Al+Si).
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 117-122
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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 (Rm, 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
Artykuł
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
Artykuł
Tytuł:
Wpływ chromu na proces krystalizacji, mikrostrukturę i właściwości siluminu podeutektycznego
Effect of chromium on the crystallization process, microstructure and properties of hypoeutectic Al-Si alloy
Autorzy:
Szymczak, T.
Gumienny, G.
Wilk-Kolodziejczyk, D.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/391684.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
silumin
chrom
mikrostruktura
właściwości mechaniczne
odlewanie ciśnieniowe
chromium
microstructure
mechanical properties
high pressure die casting
Opis:
W pracy przedstawiono wyniki badań siluminu podeutektycznego z dodatkiem chromu przeznaczonego do odlewania pod ciśnieniem. W charakterze stopu wyjściowego zastosowano silumin o składzie chemicznym zbliżonym do siluminu gatunku EN AC-46000. W celu wprowadzenia chromu do siluminu wyjściowego zastosowano zaprawę AlCr15. Ilość siluminu wyjściowego oraz zaprawy AlCr15 dobrano w proporcjach pozwalających na uzyskanie w stopie zawartości Cr około 0,1; 0,2; 0,3; 0,4 i 0,5% wag. W ramach realizacji pracy zbadano zarówno silumin wyjściowy, jak również siluminy z dodatkiem chromu. Przedstawiono wyniki analizy termicznej i derywacyjnej ATD (ang. Differential Thermal Analysis – DTA), przeprowadzonej w celu zbadania procesu krystalizacji siluminów. Pokazano mikrostrukturę siluminów odlewanych do próbnika ATD oraz ciśnieniowo. Określono podstawowe właściwości mechaniczne siluminów odlewanych pod ciśnieniem. Przedstawione wyniki analizy ATD wykazały wpływ dodatku chromu na przebieg procesu krystalizacji badanego siluminu. Na krzywych ATD siluminu wyjściowego występują trzy efekty cieplne wywołane odpowiednio krystalizacją roztworu stałego α(Al), oraz dwóch eutektyk α + Al15(Fe,Mn)3Si2 + + β i α + Al2Cu + AlSiCuFeMnMgNi + β. Wprowadzenie chromu w ilości około 0,2% wag. spowodowało wystąpienie na krzywej derywacyjnej dodatkowego efektu cieplnego pochodzącego od krystalizacji fazy międzymetalicznej zawierającej chrom. Krystalizacja tej fazy zachodzi przed wydzielaniem się z cieczy dendrytów fazy α(Al). Analiza mikrostruktury siluminów odlewanych do próbnika ATD wykazała pojawienie się wydzieleń „nowej” fazy w siluminach zawierających 0,2% wag. lub więcej Cr. Wraz z pojawieniem się na krzywych ATD dodatkowego efektu cieplnego oraz „nowej” fazy w mikrostrukturze siluminu zauważono brak fazy Al15(Fe,Mn)3Si2. W siluminach odlewanych ciśnieniowo dodatek chromu również spowodował powstanie „nowej” fazy międzymetalicznej. Faza ta pojawia się przy zawartości około 0,3% wag. lub większej Cr. Ma ona morfologię zbliżoną do ścianowej. Wraz z podwyższaniem ilości chromu rozmiary tej fazy znacząco się zwiększają. Badania podstawowych właściwości mechanicznych siluminów odlewanych pod ciśnieniem wykazały, że dodatek Cr daje możliwość znaczącego podwyższenia głównie wytrzymałości na rozciąganie Rm i wydłużenia względnego A. Pierwiastek ten w mniejszym stopniu wpłynął na podwyższenie twardości HB. Wartości umownej granicy plastyczności Rp0,2 siluminu wyjściowego i siluminów z podwyższoną zawartością chromu nie zmieniają się istotnie. Najwyższe właściwości mechaniczne uzyskano dla siluminów zawierających około 0,2 i 0,3% wag. Cr.
The paper presents the results of studies of hypoeutectic silumin with a chromium addition used for pressure casting. A silumin with the composition similar to that of EN AC-46000 was used as the initial one. In order to introduce chromium into the initial silumin, an AlCr15 master alloy was applied. The amounts of the initial silumin and the AlCr15 master alloy were selected in the proportions making it possible to obtain about 0.1; 0.2; 0.3; 0.4 and 0.5 wt. % of Cr in the alloy. Both the initial silumin and the silumins with the chromium addition were examined. The results of the thermal and derivational analysis performed to investigate the silumins' crystallization process have been presented. The microstructure of the silumins cast into an DTA tester and under pressure has been demonstrated. The basic mechanical properties of the pressure cast silumins have been presented. The results of the DTA analysis showed an effect of the chromium addition on the course of the crystallization process of the examined silumin. Three thermal effects are present on the silumin's DTA curves, caused by the crystallization of the solid solution α(Al), and of two eutectics α + Al15(Fe,Mn)3Si2 + β and α + Al2Cu + AlSiCuFeMnMgNi + + β. The introduction of chromium in the amount of about 0.2 wt. % caused the presence of an additional thermal effect on the derivation curve, originating from the crystallization of the intermetallic phase containing chromium. The crystallization of this phase occurs before the precipitation of the dendrites of phase α(Al) from the liquid. The microstructure analysis of the silumins cast into the DTA tester showed the presence of precipitations of a “new” phase in the silumins containing 0.2% wt. Cr or more. With the occurrence of an additional thermal effect on the DTA curves as well as the “new” phase in the silumin's microstructure, the lack of phase Al15(Fe,Mn)3Si2 was observed. In the pressure cast silumins, the chromium addition also caused the formation of a “new” intermetallic phase, which occurs with the Cr content of about 0.3 wt. % or more. Its morphology is similar to a faceted one. With an increase of the chromium content, the size of this phase significantly increases as well. The investigations of the basic mechanical properties of the pressure cast silumins showed that the Cr addition makes it possible to significantly increase mainly the tensile strength Rm and the unit elongation A. To a lesser extent, this element caused an increase of the hardness HB. The values of the proof stress Rp0.2 of the initial silumin and the silumins with an increased chromium content do not change significantly. The highest mechanical properties were obtained for the silumins containing about 0.2 and 0.3 wt. % Cr.
Źródło:
Prace Instytutu Odlewnictwa; 2018, 58, 1; 55-72
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 32

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