Prasad与Murthy流变失稳准则下9310钢热加工图的建立与分析

 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。

Establishment and Analysis of Processing Map for 9310 Steel Under Flow Instability Criteria of Prasad and Murthy

Hot compression tests of 9310 steel were conducted on a Gleeble-3800 thermal simulating tester at the temperature range of 900-1 200 ℃. Based on the theory of dynamic material model (DMM), the processing map of 9310 steel was established under flow instability criteria of Prasad and Murthy, and thermal processing parameters were analyzed considering with microstructures during deformation. The results indicate that the stability function [ξ(ε·)]is greater than 0 under the present deformation conditions; deformation conditions of 950-1 050 ℃ with 0.01-0.1 s-1 would be the best, and the rate of power dissipation in this region is greater than 32%; when the rate of power dissipation is constant, the deformation temperature will play a dominant role on the dynamic recrystallization grains, meanwhile, when the deformation temperature is constant, the greater strain rate could incite finer dynamically recrystallized grains.