Modeling and Simulation of Vacuum Low Pressure Carburizing Process in Gear Steel

A combination of simulation and experimental approaches to optimize the vacuum carburizing process is necessary replace costly trial-and-error method in time resources. In order accurately predict microstructure evolution mechanical properties process, a multi-field multi-scale coupled model considering interaction temperature, diffusion, phase transformation, stress was established. Meanwhile, improved combined with heat treatment software COSMAP realize low-pressure process. The 20CrMo gear steel simulated by compared results verify model. indicated that could quantitatively obtain carbon concentration distribution, Fe-C fraction, hardness distribution. It can be found content gradually decreased from surface center. relatively high only after stage. With increase diffusion time, decreases, carburized layer depth increases. are good agreement. However, there an error between calculations observations for layer. experiment less than 6%. 34 HV lower hardness. 5%, which indicates reliable. Furthermore, processes different times were achieve target under specific requirements. demonstrated optimum parameters 42 min 105 min. This provides reference guidance development optimization