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利用Gleeble-3800热模拟试验机,研究了GCr15轴承钢在变形温度800~1200℃、应变速率0.01~10 s-1、真应变0.7条件下的热变形行为,建立了其基于峰值应力的本构方程,分析了不同应变量的热加工图,并建立了再结晶区域图。结果表明:变形温度越高,应变速率越小,流变应力越低,材料越容易发生动态再结晶;确定了其在真应变0.6及0.7时的安全区与失稳区,并得到了试验钢发生部分动态再结晶的热变形工艺参数。
The thermal deformation behavior of GCr15 bearing steel under deformation strain of 800-1200 ℃, strain rate of 0.01-10 s-1 and true strain of 0.7 was studied by using Gleeble-3800 thermal simulation machine. The structure of GCr15 bearing steel based on peak stress Equations, the thermal processing diagrams of different strain quantities are analyzed, and the recrystallization area map is established. The results show that the higher the deformation temperature is, the lower the strain rate is, and the lower the flow stress is, the more likely the material is to undergo recrystallization. The safe zone and the destabilizing zone at true strains of 0.6 and 0.7 are determined, and the experimental steel Part of the dynamic recrystallization of the hot deformation process parameters.