轧后冷却制度对X100管线钢组织与性能的影响  

Effect of Cooling Process After Rolling on Microstructure and Properties of X100 Pipeline Steel

作　　者：王远琦[1] 段琳娜[2,3] 高丽平[1] 贾书君[3] 刘清友[3] 

机构地区：[1]钢铁研究总院科技信息与战略研究所,北京100081 [2]北京科技大学材料学院,北京100083 [3]钢铁研究总院工程用钢研究所,北京100081

出　　处：《钢铁研究学报》2013年第4期43-48,共6页Journal of Iron and Steel Research

摘　　要：采用热模拟试验机研究了X100管线钢的连续冷却相变规律和控轧控冷工艺中不同冷却制度下微观组织特征及显微硬度的变化规律。结果表明,随着冷却速度的升高和终冷温度的降低,试验钢微观组织逐渐细化,其中粒状贝氏体含量不断减少而板条贝氏体含量逐渐增加,显微硬度也随之增加;M/A岛含量随着冷却速度的增加而减小,随着终冷温度的降低呈现先降低后增加的"V"型趋势,且在340℃获得最低值。Continuous cooling transformation （CCT） rule and microstructure characteristics and micro-hardness change regulations in different cooling schedules of X100 pipeline steels were studied by using of thermal simula- tor. The results show that microstructure of tested steel gradually refines with cooling rate increasing and finish cooling temperature decreasing, and granular bainite content decreases and lath bainite content increases; when cooling rate increases, content and size of M/A island are refined and micro-hardness increases; when final cooling temperature decreases, size of M/A island decreases and micro-hardness increases. Changing trend of M/A island content shows ＂V＂ shape, and the minimum value of M/A island content at 340 ℃.

关 键 词：X100管线钢 微观组织 冷却速度 终冷温度 显微硬度 

分 类 号：TG339[金属学及工艺—金属压力加工]