Numerical simulation and experimental verification of microstructure evolution in a three-dimensional hot upsetting process

作者：Lin, Yong Cheng^*; Chen, Ming Song

来源：Journal of Materials Processing Technology, 2009, 209(9): 4578-4583.

DOI：10.1016/j.jmatprotec.2008.10.036

• 42CrMo steel
• Processing parameters
• Dynamic recrystallization
• Grain size

The hot compression tests of 42CrMo steel were performed in the temperature range of 850-1150 degrees C at strain rates of 0.01-10 s(-1) and deformation degrees of 10-60% on Gleeble-1500 thermo-simulation machine. The optical microstructures in the center region of the section plane were examined. Based on the results from thermo-simulation experiments and metallographic analysis, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of processing parameters, including the strain rate and deformation temperature, on the microstructure evolution of 42CrMo steel hot upsetting process were discussed by integrating the thermo-mechanical coupled finite element method with the derived microstructure evolution models. The fraction of dynamic recrystallization and dynamic recrystallization grain sizes during the hot upsetting process of 42CrMo steel were predicted. The results show that the effects of strain rates and deformation temperatures on the microstructure evolution of 42CrMo steel hot upsetting process are significant, and a good agreement between the predicted and experimental results was obtained, which confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructure evolution of hot upsetting process for 42CrMo steel.

• 出版日期2009-5-1
• 单位中南大学