A modified temperature-phase transformation-stress coupled 3D non-linear mathemat-ical model and a series of subroutines on the non-liner MARC (MARC Analysis Re-search Corporation) are developed. Then this modified model has been utilized to simu-late the heat treatment processes of 280 connecting rod of 16V280ZJ diesel locomotive.The simulation results are basically in agreement with the experiments, which testifythat the mathematical model and method are feasible. In addition, the simulationcan not only obtain the transient temperature and microstructure of heat treatmentprocess, but also provide a sound scientific basis for the heat treatment workers.
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