• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2023, Vol. 59 ›› Issue (12): 253-263.doi: 10.3901/JME.2023.12.253

• 材料科学与工程 • 上一篇    下一篇

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定量分析贝氏体钢轨钢中的偏析对疲劳磨损性能的影响

张瑞杰1,2, 郑春雷1, 张佩君1,2, 刘长波1,2, 吕博3, 杨永强4, 韩青阳1,2, 张福成1,2   

  1. 1. 燕山大学材料科学与工程学院 秦皇岛 066000;
    2. 燕山大学亚稳材料制备技术与科学国家重点实验室 秦皇岛 066000;
    3. 燕山大学环境与化学工程学院 秦皇岛 066000;
    4. 久益环球(天津)装备制造有限公司 天津 300308
  • 收稿日期:2022-10-19 修回日期:2023-04-29 出版日期:2023-06-20 发布日期:2023-08-15
  • 通讯作者: 郑春雷(通信作者),男,1981年出生,副研究员。主要研究方向为先进钢铁材料疲劳及氢脆性能。E-mail:zhengclysu@ysu.edu.cn
  • 作者简介:张瑞杰,男,1994年出生,博士研究生。主要研究方向为先进钢铁材料。E-mail:zrj0322@126.com
  • 基金资助:
    国家重点研发计划资助项目(2021YFB3703500)。

Effect of Segregation and Contact Stress on Fatigue Wear Behavior of Bainitic Rail Steel

ZHANG Ruijie1,2, ZHENG Chunlei1, ZHANG Peijun1,2, LIU Changbo1,2, LÜ Bo3, YANG Yongqiang4, HAN Qingyang1,2, ZHANG Fucheng1,2   

  1. 1. School of Materials Science and Engineering, Yanshan University, Qinhuangdao 066000;
    2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066000;
    3. School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066000;
    4. Joy Global (Tianjin) Heavy Machinery Co., Ltd., Tianjin 300308
  • Received:2022-10-19 Revised:2023-04-29 Online:2023-06-20 Published:2023-08-15

摘要: 利用摩擦磨损试验机研究了新型贝氏体钢轨钢在不同接触应力下的疲劳磨损失效机制,以及定量分析偏析程度对疲劳磨损性能的影响,为新型贝氏体钢轨的失效分析和维护提供理论基础。研究结果表明在800 MPa、1 100 MPa接触应力条件下,钢轨钢的失效机制以磨损为主,随着接触应力增加到1 340 MPa,钢轨钢的失效机制逐渐由磨损向疲劳机制转变。通过对偏析条带的定量分析发现偏析在一定程度上可以提高磨损性能,但是严重降低疲劳性能。成分偏析区域较细的显微组织以及较多的马氏体组织提高了钢轨钢的局部硬度,从而使严重偏析试样的磨损性能有所提高。严重偏析试样的失重量比轻微偏析试样的失重量少14%左右。疲劳裂纹沿偏析条带萌生和扩展,严重偏析试样产生的裂纹比轻微偏析试样的裂纹长200 %左右。因此,试样的偏析程度越高,滚动接触疲劳性能越差。

关键词: 偏析, 滚动接触疲劳, 磨损, 贝氏体钢

Abstract: The fatigue wear failure mechanism of bainitic rail steel at different contact stress and the effect of composition segregation on fatigue wear performance were studied by using friction and wear testing machine, it provides theoretical basis for failure analysis and maintenance of new bainite rail. The results were presented that the failure mechanism of rail steel was dominated by wear at 800 MPa and 1 100 MPa contact stress. As the contact stress increased to 1 340 MPa, the failure mechanism of rail steel gradually changed from wear to fatigue mechanism. The quantitative analysis of segregation bands shows that segregation can improve the wear performance to a certain extent, but severely reduce the fatigue performance. It is found that the local hardness of the rail steel was improved by the fine microstructure and some martensite in segregation region. Thus, the wear property of samples with severe segregation was improved. The weight loss of severe segregation sample was about 14% less than the weight loss of slight segregation sample. Fatigue crack initiated and propagated along the segregation band, the crack length of the severe segregation sample was about 200% longer than the crack length of slight segregation sample. Therefore, the higher the segregation degree was, the worse the rolling contact fatigue property was.

Key words: segregation, rolling contact fatigue, wear, bainitic steel

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