利用Gleeble-1500热模拟试验机研究了一种12Cr3WV低活性铁素体/马氏体钢在1 223～1 373 K,应变速率0.01 ～30 s-1条件下应变量为60％的热压缩变形行为.分析了不同温度和应变速率对实验钢热变形行为的影响,并采用应变硬化速率-应力曲线图较精确地确定了流变曲线中各特征应力应变值.研究结果表明:高温变形时铁素体的存在会抑制奥氏体的动态再结晶;实验钢的热变形激活能和应力指数分别为347.05 kJ/mol和4.11;建立了热变形本构方程,并回归出峰值应力及临界应力与Zener-Hollomon的关系式.
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