回火温度对不同自回火程度的中碳马氏体钢组织和拉伸性能的影响  

Effect of tempering temperature on microstructure and tensile properties of a medium-carbon martensitic steel with different self-tempering degrees

作　　者：刘志宇 杨达朋 易红亮[1,2] LIU Zhiyu;YANG Dapeng;YI Hongliang(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China;Easyforming Materials Technology Co.,Ltd.,Suzhou 215123,Jiangsu,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 [2]育材堂(苏州)材料科技有限公司,江苏苏州215123

出　　处：《钢铁研究学报》2023年第12期1505-1516,共12页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52101128);中国博士后科学基金资助项目(2022M710021)。

摘　　要：为探究不同自回火程度的中碳马氏体钢在回火过程中的组织演化及其对材料力学性能的影响,采用水淬与油淬2种方式淬火,研究了2种自回火程度存在明显差异的马氏体组织在不同回火温度区间内的组织演化,并对比分析了2种淬火态及回火后板料的拉伸性能。结果表明:在淬火及低温回火过程中,马氏体组织内析出的ε-碳化物会明显改善材料的塑韧性。水淬马氏体组织中的ε-碳化物是在温度为200℃的回火过程中析出。油淬马氏体组织中的ε-碳化物则是在淬火过程中析出,而在低温回火过程中,淬火态组织中的亚稳ε-碳化物会发生分解。当回火温度为300和400℃时,2种淬火态组织的演化依次为残余奥氏体的分解以及渗碳体的形成,马氏体组织中的位错密度均逐渐降低。In order to explore the microstructure evolution of a medium-carbon martensite steel with different self-tempering degrees during tempering and the related influence on mechanical properties.The microstructure evolution of two kinds of martensite with different self-tempering degrees in different tempering temperatures ranges were studied by water quenching and oil quenching.The mechanical properties of two kinds of quenched sheets and tempered sheets were compared and analyzed.The results show that the precipitation ofε-carbides during quenching or low temperature tempering can obviously improve the plasticity and toughness of the steel.When the tempering temperature is 200℃,ε-carbides precipitate from the water quenched microstructure during the tempering process.Theε-carbides in the oil quenched microstructure are precipitated during the quenching process,the metastableε-carbides in the quenched microstructure are decomposed during the low temperature tempering process.When the tempering temperature is 300℃and 400℃,the dislocation density in the two quenched martensite microstructures gradually decreases,the microstructure evolution is followed by the decomposition of residual austenite and the formation of cementite.

关 键 词：马氏体 自回火 回火 ε-碳化物 位错密度 

分 类 号：TG142.12[一般工业技术—材料科学与工程]