调质工艺对V微合金油井管用钢力学性能的影响  

Effect of Quenching and Tempering Treatment on Mechanical Properties of V-microalloyed Steel for Oil Well Pipe

作　　者：蔡志辉 文光奇 韩阿康 张开华[3] CAI Zhi-hui;WEN Guang-qi;HAN A-kang;ZHANG Kai-hua(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Materials Science&Engineering,Northeastern University,Shenyang 110819,China;Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]东北大学材料科学与工程学院,辽宁沈阳110819 [3]攀钢集团研究院有限公司,四川攀枝花617000

出　　处：《东北大学学报（自然科学版）》2021年第10期1414-1420,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51974084);攀钢研究院技术开发合作项目(2019P4C2Q01R);太原科技大学博士科研启动经费(20202039).

摘　　要：为应对复杂苛刻的工作环境,开发出可以达到Q125钢级标准的高抗拉、抗压和抗挤毁性能的油井管用钢,研究了调质工艺对V微合金化试样微观组织和力学性能的影响.结果表明:经调质处理后的实验钢的微观组织主要是回火马氏体和微量贝氏体,碳化物大量析出,使材料具有良好的综合力学性能.较低的回火温度和较长的回火时间可增加碳化物的析出量,从而增强沉淀强化作用.在610℃下回火70 min的综合力学性能最佳,屈服强度、抗拉强度及伸长率分别可达954 MPa,989 MPa及13.5%.0℃冲击功横向为25 J,轧向为46 J,满足Q125钢级油井管标准要求.In order to cope with in complex and harsh work environments,a new-typed steel for oil well pipe has been developed,whose tensile strength,compressive strength and collapse resistant can reach steel grade of Q125.The effect of quenching and tempering(Q&T)treatment on microstructure and mechanical properties of the V-microalloyed steel was studied.The results show that the microstructure of the experimental steel after Q&T treatment contains tempered martensite,a little bainite and a large number of carbide precipitations,so that the steel has good comprehensive mechanical properties.Lower tempering temperature and longer tempering time can increase the amount of of carbide precipitations,leading to a higher precipitation hardening.Mechanical properties of the steel after tempering at 610℃ for 70 min has the best performance,where the yield strength,tensile strength and elongation can reach 954 MPa,989 MPa and 13.5%,respectively.The impact energy at 0℃ is 25 J in transverse direction and 46 J in rolling direction,which meets the requirements of steel grade of Q125 for oil well pipe.

关 键 词：油井管用钢 V微合金化 调质处理 微观组织 力学性能 

分 类 号：TP20[自动化与计算机技术—检测技术与自动化装置]