热镀锌工艺对1180 MPa级双相钢组织性能的影响  

Effect of hot-dip galvanizing process on microstructure and properties of 1180 MPa grade dual-phase steel

作　　者：余灿生 郑之旺[1] 常智渊 龚慧 刘庆春[1] 张龙超 YU Cansheng;ZHENG Zhiwang;CHANG Zhiyuan;GONG Hui;LIU Qingchun;ZHANG Longchao(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;Science and Technology Quality Department,Xichang Steel and Vanadium Co.,Ltd.,Xichang 615000,Sichuan,China)

机构地区：[1]攀钢集团研究院有限公司钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]西昌钢钒有限公司科技质量部,四川西昌615000

出　　处：《中国冶金》2023年第6期108-114,共7页China Metallurgy

摘　　要：为了探索1180 MPa级热镀锌双相钢生产可行性,开展关键工艺对其组织性能影响的研究。利用连续退火模拟机研究了均热温度、缓冷温度及镀锌(均衡)温度等关键工艺参数对1180 MPa级热镀锌双相钢组织性能的影响。研究结果表明,当缓冷温度和镀锌(均衡)温度分别为720℃和460℃时,随着均热温度的升高,试验钢中铁素体含量及尺寸减小、马氏体总量及自回火马氏体含量增加,试验钢屈服强度增大、抗拉强度先升高后趋于稳定;当均热温度和镀锌(均衡)温度分别为820℃和460℃时,随着缓冷温度升高,试验钢中铁素体含量降低、马氏体和自回火马氏体总量增加,导致其抗拉强度小幅增加,但断后伸长率保持稳定;当均热温度和缓冷温度分别为820℃和720℃时,随着镀锌(均衡)温度的升高,马氏体自回火程度增加,试验钢的屈服强度增加、抗拉强度略有下降,但断后伸长率变化不大。当均热温度、缓冷温度和镀锌均衡温度分别为820、720、460℃时,1180 MPa级热镀锌双相钢可获得最佳的力学性能,即屈服强度为887 MPa、抗拉强度为1212 MPa、断后伸长率为7.0%、屈强比为0.732,其微观组织为30%铁素体(平均晶粒尺寸为1.5μm)+35%马氏体+35%自回火马氏体(体积分数)。本研究可为1180 MPa级热镀锌双相钢的工业生产提供参考。In order to explore the production feasibility of 1180 MPa grade hot dip galvanized dual phase steel,the influence of key process on its microstructure and properties was studied.The continuous annealing simulator was used to investigate the influence of soaking temperature,slow cooling temperature and galvanizing(equilibrium)temperature on microstructure and properties of 1180 MPa grade hot-galvanized dual-phase(DP)steel.The results show that when the slow cooling temperature and galvanizing(equilibrium)temperature are 720℃and 460℃respectively,with the increase of soaking temperature,the content and size of ferrite in test steel decrease,the total amount of martensite and the content of self-tempered martensite increase,the yield strength of test steel increases,and the tensile strength increases first and then tends to be stable.When the soaking temperature and galvanizing(equilibrium)temperature are 820℃and 460℃respectively,with the increase of slow cooling temperature,the content of ferrite in test steel decreases,the total amount of martensite and self-tempered martensite increases,resulting in a slight increase in tensile strength,but the elongation after fracture keeps stable.When soaking temperature and slow cooling temperature are 820 C and 720℃respectively,with the increase of galvanizing(equilibrium)temperature,the self-tempering degree of martensite increases,the yield strength of test steel increases,the tensile strength decreases slightly,but the elongation after fracture does not change much.When the soaking temperature,slow cooling temperature and galvanizing(equilibrium)temperature are 820℃,720℃ and 460℃,respectively,the 1180 MPa grade hot-dip galvanized dual-phase steel can obtain the best mechanical properties,that is,the yield strength is 887 MPa,the tensile strength is 1212 MPa,the elongation after fracture is 7.0%,and the yield ratio is 0.732.Its microstructure is 30%ferrite(average grain size is 1.5μm)+35%martensite+35%self-tempered martensite(volume fraction).This study ca

关 键 词：1180 MPa级热镀锌双相钢 均热温度 缓冷温度 镀锌温度 马氏体 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG178[金属学及工艺—金属材料]