Abstract
The objective of this study is to design the optimal die profile that can yield more uniform microstructure of a hot extruded product. The microstructure evolution, such as dynamic and static recrystallization, and grain growth, is investigated by using the program combined with Yada and Senuma's empirical equations and rigid-thermoviscoplastic FEM. The die profile of hot extrusion is represented by a Bezier–curve to generate all the possible die profiles for a given extrusion ratio and initial radius of the billet. In order to obtain the optimal die profile which contributes to uniform microstructure of the product, the FPS (Flexible Polyhedron Search) method is applied to this study. To show the validity and effectiveness of the result of this study, an experiment of hot extrusion is performed, and the result of simulation is in good agreement with that of the experiment.
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