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在Gleeble-3800热模拟试验机上对9310钢进行了900~1 200℃温度范围内的高温轴向压缩试验。基于动态材料模型理论(DMM),在Prasad和Murthy 2种流变失稳准则下建立了9310钢的热加工图,并结合变形过程中的显微组织进行了热加工参数优化的分析。结果表明,本试验条件下,9310钢热变形在Prasad和Murthy流变失稳准则下的稳定性函数ξ(ε·)均大于0;在变形条件为950~1 050℃,0.01~0.1 s-1时具有最佳的热加工性能,此区域内功率耗散率值均大于32%;能量耗散功率恒定时,变形温度对动态再结晶晶粒尺寸起主导作用,变形温度恒定时,高应变速率下的动态再结晶晶粒更加细小均匀。
In the Gleeble-3800 thermal simulation test machine 9310 steel temperature 900 ~ 1200 ℃ high temperature axial compression test. Based on the dynamic material model theory (DMM), the hot working diagram of 9310 steel was established under the Prasad and Murthy two kinds of rheological instability criteria. The optimization of thermal processing parameters was analyzed based on the microstructure in the deformation process. The results show that under the experimental conditions, the stability function ξ (ε ·) of 9310 steel under the Prasad and Murthy rheological instability criterion are all greater than 0. Under the conditions of deformation of 950 ~ 1 050 ℃, 0.01 ~ 0.1 s- 1 has the best hot workability, the power dissipation rate values in this region are greater than 32%; the energy dissipation power is constant, the deformation temperature plays a leading role in the dynamic recrystallization grain size, the deformation temperature is constant, high strain The rate of dynamic recrystallization grains are more fine and uniform.