回火工艺对1.9 GPa级超高强耐磨钢强韧性的影响  

Study on the effect of tempering process on the strength and toughness of 1.9 GPa grade ultra-high strength wear-resistant steel

作　　者：吴俊平 闫强军 姜在伟 靳剑锋 邓想涛[2] WU Junping;YAN Qiangjun;JIANG Zaiwei;JIN Jianfeng;DENG Xiangtao(Nanjing Iron and Steel Co.,Ltd.,Nanjing 210035,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]南京钢铁股份有限公司,江苏南京210035 [2]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：《轧钢》2024年第4期9-15,共7页Steel Rolling

基　　金：国家重点研发计划项目(2017YFB0305100)。

摘　　要：在双碳背景下,开发更高强度、更好耐磨性的超级耐磨钢产品,可以进一步减少因材料磨损导致的经济损失和资源浪费。对抗拉强度1.9 GPa级超高强度耐磨钢进行了研发,通过合理的化学成分设计和热处理工艺,试制出具有良好综合性能的超高强耐磨钢,并研究了回火温度对其组织及力学性能的影响。结果表明:采用880℃淬火+180℃回火热处理工艺,试制钢板获得了较为优异的综合力学性能,其抗拉强度为1951 MPa,伸长率为14%,-40℃冲击功为45.6 J。钢板微观组织为细小的板条马氏体,板条间存在少量的片状奥氏体,增加了钢板的韧性;各种强度增量贡献中,微合金化产生的Ti(C,N)和Nb(C,N)纳米碳化物提供了243 MPa的析出强化增量,在180℃回火后仍保留了高密度的淬火产生的位错,提供了828 MPa的位错强化增量。Under the background of double carbon,the development of super wear-resistant steel products with higher strength and better wear resistance can further reduce the economic loss and resource waste caused by material wear.The ultra-high strength wear-resistant steel with tensile strength of 1.9 GPa was developed.Through reasonable chemical composition design and heat treatment process,the ultra-high strength wear-resistant steel with good comprehensive properties was trial-produced,and the effect of tempering temperature on its microstructure and mechanical properties was studied.The results showed that the excellent comprehensive mechanical properties of the trial plate were obtained by quenching at 880℃and tempering at 180℃.The tensile strength was 1951 MPa,the elongation was 14%,and the impact energy at-40℃was 45.6 J.The microstructure of the plate was fine lath martensite,and there was a small amount of lamellar austenite between the laths,which increased the toughness of the plate.Among the various strength increment contributions,Ti(C,N)and Nb(C,N)nano-carbides produced by microalloying provide a precipitation strengthening increment of 243 MPa.After tempering at 180℃,high-density quenched dislocations were still retained,providing a dislocation strengthening increment of 828 MPa.

关 键 词：耐磨钢 回火 力学性能 位错强化 析出强化 双碳 

分 类 号：TG142.72[一般工业技术—材料科学与工程] TG156.5[金属学及工艺—金属材料]