高纯Cr17铁素体不锈钢的热变形行为

采用MMS200热/力模拟机及Thermo-Calc热力学计算方法,研究了高纯Cr17铁素体不锈钢在变形温度为600～1 100℃、应变速率为1～10 s-1条件下的热变形规律.结果表明,在热变形过程中,高纯Cr17铁素体不锈钢的组织均以铁素体为主,不存在γ/α相变且仅仅发生较快的动态回复软化;高纯Cr17铁素体不锈钢热的变形激活能为384.985 kJ/mol.在此基础上,确定了Z参数,并得到了高纯Cr17铁素体不锈钢的峰值应力σp与Z参数间的关系.

Hot Deformation Behavior of High-Purified 17% Cr Ferritic Stainless Steel

The hot deformation behavior of high-purified 17%Cr ferritic stainless steel at strain rates from 1 s-1 to 10 s-1 and deformation temperatures from 600 ℃ to 1 100 ℃ was investigated by Thermo-Calc thermodynamic calculation and MMS200 thermomechanical simulator.The results showed that the high-purified 17%Cr ferritic stainless steel presents a ferritic(α-Fe,bcc) microstructure without γ/α phase transformation and undergoes rapid dynamic recovery during the hot deformation.The high-purified 17%Cr ferritic stainless steel has activation energy of 384.985 kJ/mol for hot deformation.On this basis,Zener-Hollomon parameter can be determined and the correlation of Zener-Hollomon parameter with peak stress was obtained.