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通过挤压态42CrMo钢多组试样的热压缩实验获得应变速率为0.01～10 s-1、变形温度为1123～1148 K条件下的真应力-应变数据,以此作为计算应变速率敏感指数(m值)﹑能量耗散因子(η值)和失稳判据(ζ值)三重判据的底层材料数据。利用三重判据构建的加工图对挤压态42CrMo高强度钢的热成形过程进行分析,得到了挤压态42CrMo强度钢在成型过程中的稳定区域和流变失稳区。结果表明:42CrMo钢的最优变形热力参数处于具有较高η值和较高ξ值的区域内。
The true stress-strain data of strain rate of 0.01 ~ 10 s-1 and deformation temperature of 1123 ~ 1148 K were obtained by thermal compression experiments on 42CrMo steel samples. The strain rate sensitivity index m value), the energy dissipation factor (η value) and the instability criterion (ζ value) triple the underlying material data. The thermoforming process of 42CrMo high-strength steel in the extruded state was analyzed by using the processing diagram constructed by the triple criterion. The stable region and the steady-state failure region of the 42CrMo strength steel in the extruded state were obtained during the forming process. The results show that the optimal deformation thermal parameters of 42CrMo steel are in the region with higher η and higher ξ.