热轧工艺对X80级厚壁管线用钢再结晶和微观组织的影响  

Effect of Hot-rolling Process on Recrystallization and Microstructure of X80-grade Steel for Thick-walled Pipeline

作　　者：张帅 任毅 王爽 刘文月 高红 Zhang Shuai;Ren Yi;Wang Shuang;Liu Wenyue;Gao Hong(Institute of Iron&Steel Research,Anshan Iron&Steel Group,Anshan Liaoning 114009,China;State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团钢铁研究院,辽宁鞍山114009

出　　处：《上海金属》2018年第6期55-59,共5页Shanghai Metals

基　　金：国家重点研发计划(No.2017YFB0304900)

摘　　要：采用Gleeble-3800热模拟试验机研究了奥氏体再结晶区热轧温度和变形率对X80级厚壁管线用钢再结晶的影响,以及奥氏体非再结晶区热轧工艺与钢中先共析铁素体量之间的关系。结果表明,在980～1 150℃轧制,随着轧制温度的降低,钢的奥氏体晶粒明显细化;钢在980℃轧制变形20%并保温60 s后,奥氏体晶粒平均尺寸约为50μm;钢在奥氏体再结晶区轧制末段进行双道次热轧变形有利于获得理想的再结晶效果。随着在奥氏体非再结晶区热轧温度的降低,形变诱导先共析铁素体增多;钢在770℃轧制后,钢中先共析铁素体体积分数达到约15%,晶粒尺寸小于10μm。The effects of temperature and deformation rate of hot rolling in recrystallized region of austenite on recrystallization behavior of X80-grade steel for thick-walled pipeline,and the relation between process of rolling in non-recrystallized region of austenite and amount of pro-eutectoid ferrite in the steel,were investigated by a Gleeble-3800 thermal simulator.The results indicated that when rolled at temperatures ranging form 980℃to 1 150℃,the austenite grain of the X80-grade steel became much finer with the decrease of rolling temperature,and that the average size of austenite grain in the steel rolled at 980℃with deformation rate of 20%and then held for 60 s was about 50μm.The double-pass rolling which was accomplished in final stage of rolling process in the recrystallized region helped the steel to obtain satisfactory recrystallization.As the temperature of hot-rolling in non-recrystallized region of austenite decreased,the percentage of strain-induced pro-eutectoid ferrite increased in the steel.The steel rolled at 770℃exhibited much pro-eutectoid ferrite of about 15%by volume,and grain size less than 10μm.

关 键 词：X80级管线钢 厚壁 再结晶 微观组织 热轧 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]