The Microstructure Optimization of the H-shape Forgings Based on Preforming Die Design

摘要

The microstructure optimization design method of the forging process is proposed. The optimization goal is the fine grain size and homogeneous grain distribution of the forgings. The optimization object is the preforming die shape. The microstructure optimization code is developed using the micro-genetic algorithm and the finite element method. The two forming steps including the preforming process and the final forging process of the H-shape forgings are analyzed using the self-developed code. The optimization results show that the fine grain size and the homogenous grain distribution can be achieved by controlling the shape of the preforming die. The samples with the same size as optimization are preformed and then forged to the desired H-shape forgings under the same deformation conditions as optimization. Micrographs in the symmetry section of samples show that the grain sizes of the forgings are almost coincident with the optimization results.