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.