淬火工艺对U75V重轨钢组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.12.011

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金属热处理 ›› 2020, Vol. 46 ›› Issue (12) : 59-62. DOI: 10.13251/j.issn.0254-6051.2020.12.011

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工艺研究

淬火工艺对U75V重轨钢组织及力学性能的影响

马潇, 岑耀东, 陈林, 吴茂文

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Effect of quenching process on microstructure and mechanical properties of U75V heavy rail steel

MA Xiao, CEN Yaodong, CHEN Lin, WU Maowen

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摘要

采用光学显微镜、扫描电镜、硬度计、冲击试验机、万能拉伸试验机研究了U75V重轨钢轧态及淬火冷速为3℃/s和5℃/s条件下的微观组织、力学性能及断口形貌。结果表明:随着淬火冷速的增加，U75V钢的晶粒逐渐细化，珠光体片层间距减小，其中，轧态U75V钢的晶粒和片层间距最大，而5℃/s淬火冷速的U75V钢晶粒和片层间距最小;随着淬火冷速的增加，U75V钢的冲击吸收能量、硬度等综合力学性能增加。其中，轧态U75V钢轨的冲击吸收能量、硬度及抗拉强度最小，而5℃/s淬火冷速的U75V钢冲击吸收能量、硬度最优且抗拉强度较好。

Abstract

Microstructure,mechanical properties and fracture morphology of U75 V heavy rail steel as rolled and as quenched at 3℃/s and5℃/s were studied by optical microscope,scanning electron microscope,hardness tester,impact testing machine and universal tensile testing machine. The results show that with the increase of quenching rate,the grain size of the steel is refined gradually,and the pearlite lamellar spacing decreases. Among them,the grain size and lamellar spacing of the steel as rolled are the largest,and that as quenched at5℃/s are the smallest. Meanwhile,the comprehensive mechanical properties such as impact absorbed energy and hardness of the U75 V steel are increased. Among them,the impact absorbed energy,hardness and tensile strength of the steel as rolled are the lowest,and that as quenched at 5℃/s are the best.

导出引用

马潇, 岑耀东, 陈林, 吴茂文. 淬火工艺对U75V重轨钢组织及力学性能的影响[J]. 金属热处理, 2020, 46(12): 59-62 https://doi.org/10.13251/j.issn.0254-6051.2020.12.011

MA Xiao, CEN Yaodong, CHEN Lin, WU Maowen. Effect of quenching process on microstructure and mechanical properties of U75V heavy rail steel[J]. Heat Treatment of Metals, 2020, 46(12): 59-62 https://doi.org/10.13251/j.issn.0254-6051.2020.12.011

参考文献

[1] 张银花,周清跃,鲍磊,等.国内外高速铁路钢轨性能对比研究[J].中国铁道科学,2015,36(4):20-26.Zhang Yinhua,Zhou Qingyue,Bao Lei,et al. Comparative study on rail performance of high speed railway home and abroad[J]. China Railway Science,2015,36(4):20-26.
[2] 董华利.U71Mn、U75V和U78CrV钢轨在线热处理后性能改善比较[J].金属热处理,2016,41(8):133-137.Dong Huali. Comparison of property improvement of U71Mn,U75V and U78crv rail steels by online heat treatment[J]. Heat Treatment of Metals,2016,41(8):133-137.
[3] 李闯.U75V钢轨在线热处理工艺研究[J].金属热处理,2018,43(1):152-156.Li Chuang. Online heat treatment of U75V rail[J]. Heat Treatment of Metals,2018,43(1):152-156.
[4] 刘懿乐,董华利,易军,等.在线连续冷却对U75V钢轨组织和性能的影响[J].金属热处理,2017,42(1):84-86.Liu Yile,Dong Huali,Yi Jun,et al. Influence of online continuous cooling on microstructure and properties of U75V rail steel[J]. Heat Treatment of Metals,2017,42(1):84-86.
[5] 李波,朱国明,陶功明,等.在线余热淬火对U75V钢轨组织性能的影响[J].钢铁,2014,49(7):101-106,121.Li Bo,Zhu Guoming,Tao Gongming,et al. Effect of online stacking quench on microstructure and properties of U75V rail[J]. Steel and Iron,2014,49(7):101-106,121.
[6] 黄进科,赵刚,刘占龙.U75V 60 kg/m重轨在线余热淬火温度场的数值模拟[J].上海金属,2016,38(5):73-78.Huang Jinke, Zhao Gang, Liu Zhanlong. Numerical simulation of U75V 60 kg/m heavy rail temperature field during online stacking quench[J]. Shanghai Metals,2016,38(5):73-78.
[7] 王晓丽,宋波,焦国利.轧制变形对U75V重轨钢珠光体片层间距的影响[J].特殊钢,2008,29(6):52-54.Wang Xiaoli,Song Bo,Jiao Guoli. Influence of rolling deformation on interlamellar spacing of pearlite in U75V heavy rail steel[J]. Special Steel,2008,29(6):52-54.
[8] 宋华,高明昕,贾昊,等.U75V重轨冷却过程的相变变形[J].塑性工程学报,2011,18(3):95-100.Song Hua,Gao Mingxin,Jia Hao,et al. Study on the phase change deformation of U75V heavy rail during the cooling process[J]. Journal of Plastic Engineering,2011,18(3):95-100.
[9] 张建国,敬雄刚.U75V钢轨TTT曲线、CCT曲线及感应热处理的显微组织分析[J].热加工工艺,2010,39(8):168-170,113.Zhang Jianguo,Jing Xionggang. TTT&CCT curve and microstructure analysis of U75V rail after induction heat treatment[J]. Hot Working Technology,2010,39(8):168-170,113.
[10] 陈林,郭飞翔,王慧军,等.微观组织对U20Mn贝氏体钢疲劳裂纹扩展行为的影响[J].材料热处理学报,2018,39(2):119-124.Chen Lin,Guo Feixiang,Wang Huijun,et al. Effect of microstructure on fatigue crack propagation behavior of U20Mn bainitic steel[J].Transactions of Materials and Heat Treatment, 2018, 39(2):119-124.
[11] 陈林,王慧军,郭飞翔.淬火微观组织对重轨钢疲劳裂纹扩展速率的影响[J].材料导报,2017,31(14):109-112.Chen Lin, Wang Huijun, Guo Fei Xiang. Effect of quenching microstructure on fatigue crack growth rate of heavy rail steel[J].Materials Review,2017,31(14):109-112.
[12] 王慧军,陈林,郭飞翔,等.残余应力对U75V重轨钢疲劳裂纹扩展速率的影响[J].金属热处理,2017,42(6):23-27.Wang Huijun,Chen Lin,Guo Feixiang,et al. Effect of residual stress on fatigue crack propagation rate of U75V heavy rail steel[J]. Heat Treatment of Metals,2017,42(6):23-27.