12Cr3WV低活性F/M钢的高温热变形行为

Hot deformation behavior of 12Cr3WV reduced activation ferrite /martensite steel

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1223～1373K，应变速率0．01-30s-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347．05kJ／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．

The hot compressive deformation behavior of 12Cr3WV reduced activation ferrite/martensite steel is conducted on a Gleeble-1500 thermo-mechanical simulator at the temperature range of 1 223 -1 373 K with the strain rate range of 0. 01 - 30 s-1 and the height reduction of 60%. Effects of temperature and strain rate on the hot deformation behavior are investigated. The characteristics of stress and strain values of flow curve are accurately determined by means of the strain hardening rate-stress curve. The results show that the presence of ferrite in microstructure during hot deformation suppresses the dynamic recrystallization of austenite; the hot deformation activation energy and stress exponent of the experimental steel are 347.05 kJ/mol and 4. 11 respectively. The constitutive equations are established, and the relationship between the peak/critical stress and Zener-Hollomon is obtained using regression analysis.