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The near-rapid solidification conditions during additive manufacturing canlead to selection of non-equilibrium phases. Sharp interface models viainterface response functions have been used earlier to explain themicrostructure selection under such solidification conditions. However, most ofthe sharp interface models assume linear superposition of contributions ofalloying elements without considering the non-linearity associated with thephase diagram. In this report, both planar and dendritic Calphad coupled sharpinterface models have been implemented and used to explain thegrowth-controlled phase selection observed at high solidification velocitiesrelevant to additive manufacturing. The implemented model predicted thegrowth-controlled phase selection in multicomponent alloys, which the othermodels with linear phase diagram could not. These models are calculated forsteels and a Nickel-based superalloy and the results are compared withexperimental observations.

Interface Response Functions for multicomponent alloy solidification- An application to additive manufacturing