Not only the prediction of deformation but also the prediction of the material properties of forging products are important in the numerical analysis of forging problems. In this study, two functions were developed that estimate the material properties of forging products which were added to the thermocoupled rigid-plastic analysis program that has been already developed in our laboratory. One is the prediction of the fiber flow in the forging product that has provided forging process engineers with a large amount of design information. The calculation results for some automobile parts qualitatively agree with the experimental results. The other one is the prediction of the incidence of deformation-induced martensite in a forging process. In a fixed-temperature compression test, the incidence of deformation-induced martensite (Vm) is investigated, and Vm, the temperature and strain that are measured in the test are fitted as a sigmoid function. The sigmoid function is added to the thermocoupled rigid-plastic analysis program. This method is then applied to the coupled analysis of the ironing process. Vm obtained by the numerical analysis shows good agreement with that from the experiment.
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