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The paper presents results of research on a cross element damaged during the service, made of the casting alloy of aluminum - AlSi11Cu2(Fe) (AK132). Performed research was to explain the reasons for this damage and included microstructural observation as well as the investigation on mechanical properties. On the basis of the tests carried out it has been noticed that there is significant inhomogeneity of the structure characterized by the presence of both: normally modified eutectic areas (\alfa + Si) and needle-shaped primary silicon crystals. On the cross-section of the cast wall there were numerous casting defects of diverse size observed - shrinkage porosity. On the basis of the research it has been concluded that the damage of the examined element occurred as a result of fatigue cracking initiated from the surface near the marks left by the knock-outs, while the subsequent propagation of the crack ran along the primary precipitates of silicon crystals as well as through the crystals.
Czasopismo
Rocznik
Tom
Strony
29--34
Opis fizyczny
Bibliogr. 13 poz., rys., tab.
Twórcy
autor
autor
autor
autor
- Institute of Materials Engineering, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Częstochowa, grisza@wip.pcz.pl
Bibliografia
- [1] Bäckerud, L., Chai, G. and Tamminen, J., Solidification Characteristics of Aluminum Alloys, vol. 2, AFS/SKANALUMINIUM, Oslo, 1986.
- [2] Caceres, C. H., Djurdjevic, M. B., Stockwell, T. J. and Sokolowski, J. H., The Effect of Cu Content on the Level of Microporosity in Al-Si-Cu-Mg Casting Alloys, Scripta Materialia, vol. 40, pp. 631-637, 1999.
- [3] Djurdjevic, M., Sokolowski, J., and Stockwell, T., A Metallographic and Thermal Analysis of the Effect of Sr on the AlCu Eutectics in the 319 Alloy, NSERC/ Ford/ University of Windsor Industrial Research Chair in Light Metals Casting Technology Confidential Report, June 11, pp. 1-15 1998).
- [4] Tenekedjiev, N., Mulazimoglu, H., Closset, B. and Gruzleski, J., Microstructures and Thermal Analysis of Strontium-Treated Aluminum-Si Alloys, American Foundrymen's Society Inc., Des Plaines, Illinois, USA, 1995.
- [5] Doty, H. W., Samuel, A. M. and Samuel, F. H., Factors Controlling the Type and Morphology of Cu-Containing Phases in the 319 Aluminum Alloy, 100th AFS Casting Congress, Philadelphia, Pennsylvania, USA, April 20-23, pp. 1-30 (1996).
- [6] Białobrzeski A., Technologie specjalne odlewania ciśnieniowego, Instytut Odlewnictwa, Kraków, 1998.
- [7] Praca zbiorowa, Wybrane zagadnienia technologii odlewania ciśnieniowego, Instytut Odlewnictwa, Kraków, 2002.
- [8] Górny Z., Odlewnicze stopy metali nieżelaznych, WNT, Warszawa, 1992.
- [9] Poniewierski Z. Krystalizacja, struktura i właściwości siluminów, WNT, Warszawa, 1989.
- [10] PN - EN 1706 Aluminium i stopy aluminium. Odlewy. Skład chemiczny i własności mechaniczne.
- [11] Z. Górny, J. Sobczak, Nowoczesne tworzywa odlewnicze na bazie metali nieżelaznych, Wyd. ZA - PIS, Kraków,2005.
- [12] Z. Poniewierski, Krystalizacja, struktura i właściwości siluminów, WNT, Warszawa, 1989.
- [13] S. Kocańda, Zmęczeniowe pękanie metali, WNT, Warszawa, 1985.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ1-0077-0006