待温厚度与终轧温度对X80管线钢组织中马氏体/奥氏体岛的影响  

Influences of Temperature-holding Thickness and Finish Rolling Temperature on Martensite/Austenite Islands in X80 Pipeline Steel

作　　者：衣海龙[1] 麻庆申[2] 杜林秀[1] 刘相华[1] 王国栋[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004 [2]首钢总公司技术研究院,北京100041

出　　处：《机械工程材料》2009年第6期37-39,68,共4页Materials For Mechanical Engineering

基　　金：国家高技术研究发展计划资助项目(2003AA33G010)

摘　　要：利用光学显微镜、扫描电镜及透射电镜分析了经不同工艺热轧得到的22 mm厚X80管线钢中马氏体/奥氏体(M/A)岛的形貌及分布。结果表明:M/A岛的形貌及分布与待温厚度和终轧温度密切相关,适当增加待温厚度,降低终轧温度有利于细化M/A岛的组织,减小M/A岛的尺寸,降低M/A岛的体积分数,使X80管线钢的落锤性能得到改善。Morphology and distribution of martensite/austenite（M/A） islands in X80 pipeline steel hot rdled with different processes were observed by optical microscopy, scanning electron microscopy and transmission electron microscopy. The results show that the temperature-holding thickness and finish rolling temperature exerted a great influence on the size and distribution of M/A islands. When the temperature-holding thickness of the billet went up and the finish rolling temperature went down, it could facilitate the refiment of M/A structure , reduce the size and volumn fraction of M/A islands, and improve drop-weight-tear-test（DWTT） performance of the steel.

关 键 词：X80管线钢 M/A岛 待温厚度 终轧温度 

分 类 号：TG33[金属学及工艺—金属压力加工]