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利用Gleeble-3800热模拟试验机对试验钢在950~1100℃,应变速率为0.1~5.0 s-1,最大应变量为60%的条件下进行了热压缩模拟试验。结果表明:高变形温度、低应变速率和大变形量有利于动态再结晶,试验在1050℃、变形量60%、变形速率1 s-1条件下得到圆整均匀再结晶晶粒,平均晶粒尺寸为14.84μm;推演出低碳Ti-Mo微合金马氏体钢的形变激活能为462.8 kJ/mol及Z参数与动态再结晶变形条件的关系;建立起试验钢动态再结晶临界应变公式εc=0.3729Z0.3496。
The hot compression simulation test was carried out on Gleeble-3800 thermal simulator at 950-1100 ℃, strain rate of 0.1-5.0 s-1 and maximum strain of 60%. The results show that the high deformation temperature, low strain rate and large deformation are conducive to dynamic recrystallization. In the experiment, uniform and recrystallized grains were obtained at 1050 ℃, 60% deformation rate and 1 s-1 deformation rate. The average grain size Size of 14.84μm. The deformation activation energy of low-carbon Ti-Mo microalloyed martensitic steel was deduced to be 462.8 kJ / mol. The relationship between Z parameter and dynamic recrystallization deformation was established. The critical strain formula of dynamic recrystallization εc = 0.3729Z0.3496.