Transactions of Materials and Heat Treatment

Title：High temperature rheological behavior and thermal processing diagram for 34CrNiMo6 steel

Authors： Gou Chunmei Dong Jing Cui Dandan

Unit： Xinjiang Vocational and Technical College of Communications

KeyWords： 34CrNiMo6 steel high temperature rheological behavior Arrhenius model thermal processing diagram dynamic recrystallization

ClassificationCode：TG142

year,vol(issue):pagenumber：2023,48(2):233-240

Abstract：

The high temperature rheological properties of 34CrNiMo6 steel was studied and the best thermal processing window was obtained. Firstly, the isothermal thermal compression test of 34CrNiMo6 steel was carried out by Gleeble-3500 thermal simulated test machine under the deformation temperature of 1173-1473 K and the strain rate of 0.001-1 s-1, and the true stress-true strain curves under different strain rates and deformation temperatures were obtained. Then, the Arrhenius model was used to conduct multiple nonlinear regression on the constitutive relationship of the material, and the results show that the regression accuracy is high. Secondly, the thermal processing diagram of 34CrNiMo6 steel was constructed and analyzed by using the rheological data, and considering all strain conditions, the thermal processing window of 34CrNiMo6 steel should avoid the regions where the deformation temperature is lower than 1300 K and the strain rate is higher than 0.05 s-1, and the deformation temperature is higher than 1400 K and the strain rate is higher than 0.14 s-1. Finally, the metallographic analysis shows that 34CrNiMo6 steel has the characteristics of inhomogeneous grains and irregular grain boundaries in the region where the strain rate sensitivity coefficient, energy dissipation rate and instability criterion are small, which is due to incomplete dynamic recrystallization. However, complete dynamic recovery and dynamic recrystallization occur in the region where the strain rate sensitivity coefficient, energy dissipation rate and instability criterion are relatively large, and the microstructure is relatively uniform.

Funds：

全国交通运输职业教育科研项目（2019B57）

作者简介：苟春梅(1985-), 女, 硕士，副教授，E-mail：gcm8507@163.com

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