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通过热压缩试验获得42CrMo钢铸坯的流变应力,以动态材料模型和Prasad’s失稳准则为基础,建立不同变形量下42CrMo钢铸坯的功率耗散图、失稳图及加工图,分析其热变形过程并确定稳态变形参数。研究得出了变形失稳区在高应变速率(大于0.35 s-1)时出现,且随应变速率的增加和变形量的增大,失稳区域变宽。变形温度850~1150℃、应变速率0.05~0.35 s-1为稳态变形区域。功率耗散效率的峰值35%出现在1100℃/0.05 s-1处,被认为是最佳变形工艺参数。
The flow stress of 42CrMo steel billet was obtained by hot compression test. Based on the dynamic material model and Prasad’s instability criterion, the power dissipation diagram, the instability diagram and the processing diagram of 42CrMo steel billet under different deformations were established and analyzed Deformation process and determine the steady-state deformation parameters. The results show that the zone of deformation and instability occurs at high strain rate (> 0.35 s-1), and the zone of instability becomes wider with the increase of strain rate and deformation. Deformation temperature 850 ~ 1150 ℃, strain rate 0.05 ~ 0.35 s-1 for the steady deformation area. 35% of the peak power dissipation efficiency occurs at 1100 ° C / 0.05s-1, which is considered as the best deformation process parameters.