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Experimental determination of grain growth kinetics during eutectic solidification

Miguel Morua, Marco Ramirez-Argaez, Carlos Gonzalez-Rivera

In this work a method to estimate grain growth parameters during equiaxed eutectic solidification is presented. The method assumes free grain growth before impingement and an exponential dependence of the grain growth rate on undercooling. In order to validate the method, a heat transfer / solidification kinetics (HT/ SK) model was implemented. Once validated, the method was used to estimate experimentally the kinetic parameters of equiaxed growth of a near eutecticAl-Si alloy notmodified anmodified with Sr. Results shows that eutectic grain growth parameters of eutectic Al-Si change as a consequence of eutectic modification with Sr.