Abstract
Abstract The grain size and its distribution have very important effects on mechanical behaviors of the formed parts, and the grain size evolution is controlled by multiple dynamic microstructure changes. Therefore, the numerical simulation of these microstructure changes will be significant for improving part quality. In this paper we discuss two important problems for the prediction grain size evolution. One is the constitutive relation considering the microstructure change processes, the another is the identification of the material constitutive parameters. Finally we present some numerical examples to show the influences of the process parameters on the grain size inhomogeneity and the influences of grain growth on the superplastic forming process.
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