根据AISI1215钢热模拟压缩实验的结果,采用Poliak和Jonas提出的计算动态再结晶临界应变(εc)和临界应力(σc)方法,研究了形变温度和应变速率对εc和σc的影响规律.结果表明,在应变速度较低时(小于30 s-1),采用指数函数形式可以较好描述热加工参数Z(Zener-Hollomon参数)与εc,σc,εp(峰值应变)和σp(峰值应力)间的关系,实验分析的结果表明,峰值应变(临界应变)与Z参数之间表现为正比关系,Z参数增大(形变温度降低或应变速度增加),材料发生动态再结晶的临界应变增加,应力应变曲线上表现出的表观峰值应变增加.根据模型计算的结果,在实验数据的范围内,动态再结晶临界应变与应力应变曲线的峰值应变之间的比值约为0.4～0.5之间,明显小于一般工程应用中估计的0.7.根据模型的计算的结果,用中断淬火试验进行了验证,结果表明与模型计算值吻合良好.
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