S32750超级双相不锈钢的热变形及组织分析  

Hot Deformation and Microstructures Analysis of S32750 Super Duplex Stainless Steel

作　　者：王佳夫[1] 花福安[1] 刘振宇[1] 王国栋[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2011年第7期948-951,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50971039);东北大学轧制技术及连轧自动化国家重点实验室自主研究课题

摘　　要：利用MMS-200热模拟实验机,对S32750超级双相不锈钢在温度为1 000～1 150℃,应变速率为0.01～10 s-1的条件下进行了单道次压缩实验,测定了真应力-真应变曲线,对热变形组织进行了分析.实验结果表明:当变形温度一定时,峰值应力随着应变速率的增加而增加.提高热变形温度,降低应变速率,可以促进奥氏体动态再结晶的发生.根据热变形方程计算得到压缩变形时的热变形激活能Q=460 kJ/mol.在相应的变形条件下,获得了S32750超级双相不锈钢热变形过程中峰值应力与Z参数的关系式.The hot deformation behavior of super duplex stainless steel S32750 was investigated through MMS-200 thermal-mechanical simulator within 1 000～1 150 ℃ and the strain rate range of 0.01～10 s-1.The corresponding flow curves were determined and the microstructures were analyzed.The results showed that peak stress increases with the increasing strain rate.Dynamic recrystallization of austenite is enhanced by increasing temperature and decreasing strain rate.Based on the constitutive equation for hot deformation,the apparent activation energy（Q） of the steel is 460 kJ/mol.According to the present experimental data,the relationship between peak stress and Z parameter is obtained.

关 键 词：超级双相不锈钢 热变形 真应力-真应变 激活能 Z参数 

分 类 号：TG142.71[一般工业技术—材料科学与工程]