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采用Gleeble热模拟试验机对45Cr4Ni Mo V合金在变形温度为1000~1150℃,应变速率为0.002~5 s-1,最大变形量为55%的条件下进行热模拟压缩试验。通过对采集到的数据进行处理,结合lnθ-ε曲线的拐点及-(lnθ)/ε-ε曲线的极小值判据,建立了45Cr4Ni Mo V动态再结晶临界应变模型。结果表明,45Cr4Ni Mo V合金动态再结晶临界应变随变形温度递增以及应变速率递减而增加,临界应变εc与峰值应变εp之间满足:εc=0.42761εp,动态再结晶临界应变模型为:εc=0.000522Z0.15142。
The thermal simulation of 45Cr4Ni Mo V alloy was carried out with Gleeble thermal simulator at deformation temperature of 1000-1150 ℃, strain rate of 0.002-5 s-1 and maximum deformation of 55%. The critical strain model of 45Cr4Ni Mo V dynamic recrystallization was established by processing the collected data and combining with the minimum point criterion of lnθ-ε curve and- (lnθ) / ε-ε curve. The results show that the critical recrystallization critical strain of 45Cr4Ni Mo V alloy increases with increasing deformation temperature and decreasing strain rate. The critical strain εc and peak strain εp satisfy the following formula: εc = 0.42761εp. The dynamic recrystallization critical strain model is εc = 0.000522 Z0.15142.