中文摘要：

采用Thermorestor-W热模拟试验机，对Crl5Mn9Cu2NilN不锈钢进行热压缩试验，研究其在变形温度950-1200℃，应变速率0．01～2．5S1条件下的动态再结晶行为．当变形温度高于1000℃后，Crl5Mn9Cu2NnN不锈钢的变形以动态再结晶为主，且随温度升高，峰值应力对应的应变减小．利用应变硬化率一应力曲线确定的材料动态再结晶临界应力σp、峰值应力σp、饱和应力氏σs和稳态应力魄的数值，回归得到临界动态再结晶应变e。与Zener-Hollomon参数的关系，并确定临界应力与峰值应力的关系．通过建立Cr15Mn9Cu2NnN不锈钢的热变形动态再结晶Avrami模型，分析应变速率和变形温度对Avrami曲线的影响，表明应变速率比温度对Crl5Mn9Cu2NilN不锈钢的动态再结晶Avrami曲线的影响更加显著．

英文摘要：

The hot deformation behavior of austenitic stainless steel Crl5Mn9Cu2NilN was investigated with compression test on Thermorestor-W thermal simulation testing machine in temperature range of 950 --1 200 ℃ ,strain rate range of 0. 01-2.5 s-1 , and with maximum strain of 0.8. The result showed that dynamic recrystallization occurred during deformation. As the deformation temperature increased, the critical strain and peak stress of dynamic recrystallization decreased, and softening caused by dynamic re- crystallization was more obvious. The critical stress σc, peak stress σp, saturation stress ash（e）, and steady- state stress σs of dynamic recrystallization of meterial were determined by strain-hardening rate-flow stress curve. The relationship of critical strain of dynamic recrystallization σc with the Zener-Hollomon parameter was obtained by regression. The relationship of critical stress with peak stress was determined, also. By means of establishing the Avrami model of recrystallization of austenitic stainless steel Cr15Mn9Cu2Ni1N, the influence of strain rate and deformation temperature on Avramic curve was analyzed. The result showed that there was a greater influence of strain rate on Avrami curve than temperature.