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中文摘要：
通过双道次压缩实验，在Gleeble 1500热模拟试验机上研究了X70管线钢在不同变形工艺下奥氏体的软化行为，分析了不同变形温度、间隔时间、应变速率、变形量及初始奥氏体晶粒尺寸等参数对静态再结晶行为的影响规律，采用应力补偿法计算了不同变形条件下的静态再结晶百分率．根据实验数据，计算出X70管线钢静态再结晶激活能为435．3kJ·mol^-1，建立了其静态再结晶动力学模型．
英文摘要：
The softening behavior of austenite in X70 pipeline steel was investigated on a Gleeble 1500 thermo-mechanical simulator at different deformation parameters by double-pass hot compression testing. The influence of the parameters such as deformation temperature, interval time between passes, strain rate, degree of reduction, and initial austenite grain size on the mechanism of static recrystallization was analyzed. The softening percentage of static recrystallization under different conditions was defined by the 0.2 % stress offset method. On the base of experimental data, the value of austenitic static recrystallization activation energy of X70 pipeline steel is 435.3 kJ· mol^- 1, and a static recrystallization kinetics model to predict the evolution of softening was developed.
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