Flow impact on cast ingots

Details Flow impact on cast ingots Flow impact on cast ingots

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp1290...84r&link_type=abstract

In: Microgravity applications programme: Successful teaming of science and industry. Edited by Andrew Wilson, coordination: Benn

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Physical Sciences, Alloys

Scientific paper

Aluminium alloys are a standard cast metal used in a number of automotive and transportation applications, allowing manufacturers to reduce vehicle weight, increase the strength of components and improve emission controls. One of the most challenging problems associated with aluminium casting is the influence of convection during all stages of solidification. The strength of fluid flow changes the as-cast internal structure (microstructure) such that the yield, fracture and fatigue strengths of the cast ingot can vary considerably. Although the importance of fluid flow has been recognised for decades, not even a simple model has been developed to predict the effect on microstructure. The MICAST project aims to identify and control experimentally the fluid-flow patterns that affect microstructure evolution during casting processes, and to develop analytical and advanced numerical models. The microgravity environment of the International Space Station and sounding rockets is of special importance to this project because only there are all gravity-induced convections eliminated and well-defined conditions for solidification prevail that can be disturbed by fluid flow controlled by experimenters.

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