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Computational models of solidification have proven to be very valuable to foundrymen in optimizing their casting processes. Current computer models can predict feeding characteristics, macroporosity formation, and even the development of grain structure in some alloys. However, stress related defects like hot tearing continue to plague foundries. Present research is attempting to incorporate stress analysis into the computational framework to better understand hot-tearing and related defects during casting. Proper mechanical constitutive relationships for the alloys of interest must be determined for the very high temperature deformation adjacent to and including the mushy zone of the casting. This paper presents the effects of temperature and strain rate on the compression response of Inconel7 18 castings. The experimental data is compared with other investigations and potential constitutive relationships are reviewed. The observed mechanical behavior is discussed with respect to the underlying microstructural features and appropriate deformation mechanisms. 345