Abstract: The hot compression test of 12 mm hot rolled sheet of 2507 super duplex stainless steel (/% ： 0. 022C, 0. 58Si, 25. 35Cr, 7. 17Ni, 4. 05Mo, 0. 28N) with strain rate 0. 01 ~ 10 s^-1 at 1 000 〜1 150 °C has been carried out by using MMS-200 thermal-mechanical simulator. Test results show that at definite strain rate, with increasing deformation temperature the peak stress of 2507 super duplex stainless steel decreases: and at definite deformation temperature, with increasing strain rate the peak stress increases. Based on the constitutive equation for hot deformation, the calculated hot compression average apparent stress exponent n= 3. 25, and hot deformation activation energy Q = 460 kJ/moL According to test dada a hot deformation equation for 2507 super duplex stainless steel at corresponding deformation condition is established.

摘要： 用MMS-200热模拟实验机对2507超级双相不锈钢(/%:0.022C、0.58Si、25.35Cr、7.17Ni、4.05Mo、0.28N)12 mm热轧板在1 000～1150℃、应变速率0.01～10s^-1下进行了热压缩实验。实验结果表明,在应变速率一定的条件下,变形温度越高,2507超级双相不锈钢峰值应力越低;在变形温度一定的条件下,峰值应力随着应变速率的增加而增加。根据热变形方程计算得到压缩变形时的平均表观应力指数n=3.25,热变形激活能Q=460kJ/mol。基于实验数据构建了2507超级双相不锈钢在相应变形条件下的热变形方程。

关键词: 超级双相不锈钢, 热变形, 真应力-真应变, 激活能