The effects of casting parameters on residual stresses and microstructure variations of an Al-Si cast alloy
2009 (English)In: International Centre for Diffraction Data, ISSN 1097-0002, Vol. 52, 553-560 p.Article in journal (Refereed) Published
Different casting parameters can change the microstructure and residual stresses of castings. The microstructure of Al-Si cast alloys is influenced by the morphology of silicon particles (shape, size and distribution), aluminum grain size and dendrite parameters. Dimensional changes resulting from casting caused by residual stresses can particularly affect the quality of near net shape castings. In this research, the influence of casting process parameters such as modification, superheat temperature, mould hardness and mould design on residual stresses and microstructure of an Al-Si-Mn alloy have been investigated. Experiments were conducted with different superheat, mould hardness, modification with Al-10Sr and two different casting designs. The micro structural changes associated with these parameters have been studied by optical microscopy, scanning electron microscopy and image analysis. The type and extent of residual stresses of all samples were determined using the sectioning method. The results show that all of the mentioned casting parameters have clear effects on residual stresses. The residual stresses decrease with lowered superheat, temperature and mould hardness. It was found that the residual stress increases both with adding a eutectic modifier and with change of casting design. It wasalso found that microstructure and mechanical properties are influenced significantly by the mentioned parameter.
Place, publisher, year, edition, pages
ICCD , 2009. Vol. 52, 553-560 p.
National CategoryEngineering and Technology Other Materials Engineering
IdentifiersURN: urn:nbn:se:liu:diva-60908OAI: oai:DiVA.org:liu-60908DiVA: diva2:359717