热轧双相钢动态连续冷却转变及微观取向分析
Dynamic Continuous Cooling Transformation and Micro-orientation
潘啸波
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作者单位:中冶华天工程技术有限公司 轧钢事业部, 安徽 马鞍山 243005
中文关键字:双相钢; 形变奥氏体; CCT曲线; 微观取向; 岛状马氏体
英文关键字:dual phase steel; deformation austenite; CCT curve; micro-orientation; island martensite
中文摘要:采用Gleeble1500热力模拟试验机对马氏体双相钢的形变奥氏体连续冷却转变曲线(CCT曲线)进行了测定,利用光学显微镜对组织进行了观察,利用电子背散射对微观取向进行了统计分析。结果表明,当冷速大于5 ℃/s时,有马氏体生成,随着冷却速度的增加,马氏体的含量增多,同时出现少量的贝氏体组织;当冷速为30 ℃/s时,其组织细小,岛状马氏体分布均匀,{111}纤维织构的体积分数异常增加。
英文摘要:The deformation austenite CCT curve of martensite dual phase steel was measured by thermo-dynamic simulation tester Gleeble1500. The microstructure was observed by optical microscope; the micro-orientation was analyzed statistically by electron backscattered diffraction (EBSD). The results show that the martensite begins to form when cooling velocity is greater than 5 ℃/s. The martensite content increases with the cooling velocity increasing. At the same time, a few bainite appears; when cooling velocity is 30 ℃/s, the microstructure is fine and island martensite uniformly distributes, the volume ratio of {111} fiber texture unconventionally increases.