冷速及变形对X70级管线钢相变及组织的影响Effect of cooling rate and deformation on transformation and microstructure of a X70 grade pipeline steel
杨景红,刘清友,孙冬柏,李向阳
摘要(Abstract):
通过一种微合金高强管线钢未变形及热变形条件下连续冷却相变行为的研究,建立了相应的奥氏体连续冷却相变曲线,结合光学显微镜及扫描电镜的微观组织观察,研究了冷却速度及热变形对该钢相变及组织的影响;试验结果表明,试验钢在试验冷速范围内组织由多边形铁素体+珠光体,针状铁素体,贝氏体铁素体构成;变形将针状铁素体的相变温度提高100℃以上,形成针状铁素体的冷速范围由未变形的0.5~15℃/s扩大到变形后的3~50℃/s以上,促进了针状铁素体转变;随变形后冷却速度及变形量的增加,基体组织变细,基体中M/A小岛变得更加细小、弥散。
关键词(KeyWords): 管线钢;热变形;针状铁素体;相变
基金项目(Foundation): 国家科技支撑计划项目(2006BAE03A15)
作者(Author): 杨景红,刘清友,孙冬柏,李向阳
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