V-N微合金化X80抗大变形管线钢的组织与力学性能  

Microstructure and Mechanical Properties of V N MicroalloyedX80 High Deformability Pipeline Steel

作　　者：王明明 高秀华[1] 杜林秀[1] 张大征 WANG Ming-ming;GAO Xiu-hua;DU Lin-xiu;ZHANG Da-zheng(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

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110819

出　　处：《东北大学学报（自然科学版）》2020年第6期801-806,共6页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2015AA03A501).

摘　　要：通过热模拟试验机研究了V-N微合金钢过冷奥氏体动态连续冷却相变行为,设计了V-N微合金化X80抗大变形管线钢的轧制与冷却工艺参数并分析了组织和力学性能的关系.结果表明,动态CCT曲线出现高温转变区和中温转变区分离的现象,转变温度范围分别是637~728℃和441~601℃,当冷速为10~20℃/s时,形成针状铁素体为主的组织.V-N微合金化管线钢组织以多边形铁素体和针状铁素体为主,屈服强度、抗拉强度、均匀延伸率和-20℃夏比冲击功分别为603 MPa,724 MPa,11. 1%和214 J,满足API Spec 5L对X80管线钢的力学性能要求,同时具有好的强塑性匹配.The dynamic continuous cooling transformation behavior of undercooled austenite in a V-V microalloyed steel was studied by means of thermal simulation test machine.Furthermore,the rolling and cooling process parameters of V-V microalloyed X80 high deformability pipeline steel were designed and the relationship between micro structure and mechanical properties was analyzed.The dynamic CCT curve shows a separation of high temperature transformation region and intermediate temperature transformation region,and the transformation ranges are 637~728℃and 441~601℃,respectively.When the cooling rate is in the range of 10~20℃/s,the microstructure mainly consists of acicular ferrite.The microstructure of V-M microalloyed pipeline steel is dominated bypolygonal ferrite and acicular ferrite.Yield strength,tensile strength,uniform elongation and-20 Charpy impact energy are 603 MPa,724 MPa,11.1%and 214 J,respectively.These meet the requirements of X80 pipeline steels according to the API Spec 5 L specification that the produced pipeline steel should have a good combination of strength and ductility.

关 键 词：V-N微合金化 管线钢 抗大变形 显微组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]