采用Gleeble热模拟试验机对45Cr4NiMoV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-(θ)(lnθ)/(θ)ε-ε曲线的极小值判据,建立了45Cr4NiMoV动态再结晶临界应变模型.结果表明,45Cr4NiMoV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.
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