高性能钢板Q890的开发  

Development of high performance steel Q890

作　　者：麻衡 Ma Heng(Laiwu Branch Technology Center,Shandong Iron and Steel Co.,Ltd.,Laiwu Shandong 271104,China)

机构地区：[1]山东钢铁股份有限公司莱芜分公司技术中心

出　　处：《金属热处理》2019年第12期84-89,共6页Heat Treatment of Metals

摘　　要：通过光学显微镜、透射电镜、EBSD分析以及对样品在不同温度下的拉伸、冲击和硬度试验,对Q890钢板的微观组织、晶界和力学性能进行分析,并且在轧机上进行了Q890钢板的工业试制。试制结果表明:在轧制过程中奥氏体晶粒明显细化和拉长,扁平化奥氏体的厚度约为5μm,随着奥氏体超薄化,马氏体或贝氏体尺寸减小且大角度界面密度增加,采用在线TMCP工艺成功试制出屈服强度900 MPa级、-40℃冲击吸收能量超过200 J高强韧性钢板。The microstructure,grain boundary and mechanical properties of Q890 steel plate were analyzed by optical microscope,transmission electron microscope and EBSD analysis as well as tensile,impact and hardness tests at different temperatures.And the industrial trial plate of Q890 steel was produced in the rolling mill.The results of rolling test show that the austenitic grain is obvious refined and the thickness of the flat austenitic is about 5μm.As the austenitic ultra-thin,the size of martensite and bainite is decreased and the density of large angle interface is increased.The high toughness steel plate is successfully trial-produced by using online TMCP process,which has good comprehensive properties,such as yield strength of 900 MPa grade and impact absorbed energy at-40℃over 200 J.

关 键 词：低碳 低合金 高强韧性 大角度界面 Q890钢 

分 类 号：TG142.12[一般工业技术—材料科学与工程]