抗大变形管线钢的动态再结晶行为  

Dynamic Recrystallization Behavior of High Deformability Pipeline Steels

作　　者：谭峰亮[1,2] 刘清友[2] 贾书君[2] 雷霆[3] 段琳娜[2,4] 

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]钢铁研究总院结构材料研究所,北京100081 [3]昆明冶金高等专科学校,昆明650033 [4]北京科技大学材料科学与工程学院,北京100083

出　　处：《机械工程材料》2013年第5期30-35,共6页Materials For Mechanical Engineering

摘　　要：采用Gleeble-3800型热模拟试验机研究了抗大变形管线钢在不同压缩变形条件下的动态再结晶行为,采用光学显微镜和扫描电镜观察了奥氏体的形貌,利用线性回归法对真应力-真应变数据进行分析,得到了试验钢的热变形方程。结果表明:ε=1s-1,ε=0.30时,试验钢发生部分动态再结晶的温度区间为920～1 020℃;在980℃,ε=1s-1时,发生部分动态再结晶的应变为0.20～0.40,而且应变对再结晶晶粒尺寸的影响不大;ε=0.40时,动态再结晶基本完成,0.40<ε<0.60,发生了多轮动态再结晶,再结晶晶粒尺寸随应变的增大而减小;试验钢在950～1 100℃的热变形激活能为360.365kJ.mol-1,应力指数n为4.326 3。The dynamic recrystallization behavior of high deformability pipeline steel was studied by a （ileeble 3800 thermal simulator under different compression deformation conditions, and the austenite morphology was observed I）y oplical microscopy and scanning eleclron microscopy. ~Fhe true stress true strain data were analysedby linear regression method to obtain thermal deformation equation of the tested steel. The results show that partial dynamic recrystallization temperature zone was 920-1 020 ℃ when ε= 1 s^-land ε=0. 30. The strain for partial dynamic recrystallization was 0. 20-0. 40 at 980 ℃ and 1 s^-1, and the strain had little effects on austenite recrystallization grain size. The dynamic recrystallization completed mainly when ε=0. 4, and when 0. 10〈ε〈0. 60 many times dynamic recrystallization took place, and recrystallization grain size： decreased with the increase of strain. The hot deformation activation energy of the tested steel was 360. 365 kJ · mol^-1 and the stress index was 4. 326 3 at 950～ 1 100℃.

关 键 词：抗大变形管线钢 动态再结晶 热压缩 模拟 

分 类 号：TG142.41[一般工业技术—材料科学与工程]