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2015 | Vol. 15, iss. 1 spec. | 13--16
Tytuł artykułu

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

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

Rocznik
Strony
13--16
Opis fizyczny
Bibliogr. 11 poz., rys., tab.
Twórcy
autor
  • Institute of Materials Science, Materials Engineering and Metallurgy Faculy, Silesian University of Technology, Krasińskiego 8 Str., 40-019 Katowice, Poland , bartlomiej.dybowski@polsl.pl
  • Department of Production Engineering, Materials Engineering and Metallurgy Faculy Silesian University of Technology, Krasińskiego 8 Str., 40-019 Katowice, Poland
autor
  • ZM „WSK Rzeszów” Sp. z o.o. Hetmańska120 Str., 35-078 Rzeszów, Poland
autor
  • Institute of Materials Science, Materials Engineering and Metallurgy Faculy, Silesian University of Technology, Krasińskiego 8 Str., 40-019 Katowice, Poland
Bibliografia
  • [1] Davis, JR. (1990). ASM handbook. ASM, Metals Park, OH, ISSN: 978-0-87170-657-7, 123–151.
  • [2] Cais, J., Weiss, V. & Svobodova, J. (2014). Relation between Porosity and Mechanical Properties of Al-Si Alloys Produced by Low- Pressure Casting, Archives of Foundry Engineering, V14 - SI1 20, ISSN 1897-3310.
  • [3] Sha, G., Möller, H., Stumpf, W.E., Xia, J.H., Govender, G. & Ringer, S.P. (2012). Solute nanostructures and their strengthening effects in Al–7Si–0.6Mg alloy F357, Acta Materialia 60 ISSN: 1359-6454.
  • [4] Cao, X. & Campbell, J. (2006). Morphology of β-Al5FeSi Phase in Al-Si Cast Alloys, Materials Transactions 47, ISSN 1347-5320.
  • [5] You Kim, H., Young Park T., Won Han, S. & Mo Lee, H. (2006). Effects of Mn on the crystal structure of α-Al(Mn,Fe)Si particles in A356 alloys, Journal of Crystal Growth 291, ISSN 0022-0248.
  • [6] Sanna, F., Fabrizi, A., Ferraro, S., Timelli, G., Ferro, P. & Bonollo, F. (2013). Multiscale characterisation of AlSi9Cu3(Fe) die casting alloys after Cu, Mg, Zn and Sr addition, La Metallurgia Italiana 4, ISSN 0026-0843, 13-24.
  • [7] Bolibruchová, D. & Richtárech, L. (2015). Elimination of Iron Based Particles in Al-Si Alloy, Archives of Foundry Engineering, V15 - I1 02, ISSN 1897-3310.
  • [8] Kral, M.V. (2005). A crystallographic identification of intermetallic phases in Al–Si alloys, Materials Letters 59, ISSN 0167-577X, 2271-2276.
  • [9] Suarez-Pena, B. & Asensio-Lozano, J. (2006). Influence of Sr modification and Ti grain refinement on the morphology of Fe-rich precipitates in eutectic Al–Si die cast alloys, Scripta Materialia 54. 1543-1548 ISSN: 1359-6462.
  • [10] Dahle, A.K., Nogita, K.S., McDonald, D., Dinnis, C. & Lu, L. (2005). Eutectic modification and microstructure development in Al–Si Alloys, Materials Science and Engineering A 413-414. 243-248 ISSN: 0921-5093.
  • [11] Dybowski, B., Adamczyk-Cieślak, B., Rodak, K., Bednarczyk, I., Kiełbus, A. & Mizera, J. (2015). The microstructure of AlSi7Mg alloy in as cast condition, Solid State Phenomena 229. 3-10 ISSN: 1662-9779.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-370ea3a9-dcc3-4caf-b334-f554db2fe335
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