金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 17-24.DOI: 10.13251/j.issn.0254-6051.2025.10.003

• 组织与性能 • 上一篇    下一篇

珠光体片层间距对U75V轨道用钢抗接触损伤行为的影响

吴三秀1, 王海波1, 熊光耀1,2, 罗世民1, 余卓骅1, 秦云飞1   

  1. 1.南昌交通学院 智能制造学院, 江西 南昌 330013;
    2.华东交通大学 材料科学与工程学院, 江西 南昌 330013
  • 收稿日期:2025-05-21 修回日期:2025-08-08 出版日期:2025-10-25 发布日期:2025-11-04
  • 通讯作者: 秦云飞,助教,硕士,E-mail: a1611679940@163.com
  • 作者简介:吴三秀(1989—),女,讲师,硕士,主要研究方向为钢轨热处理及其服役行为,E-mail: 805633807@qq.com。
  • 基金资助:
    江西省教育厅科学技术研究项目(GJJ2403003);江西省自然科学基金面上项目(20224BAB202031);国家自然科学基金(51965019)

Effect of pearlite interlayer spacing on contact damage resistance behavior of U75V rail steel

Wu Sanxiu1, Wang Haibo1, Xiong Guangyao1,2, Luo Shimin1, Yu Zhuohua1, Qin Yunfei1   

  1. 1. School of Intelligent Manufacturing, Nanchang Jiaotong Institute, Nanchang Jiangxi 330013, China;
    2. School of Materials Science, East China Jiaotong University, Nanchang Jiangxi 330013, China
  • Received:2025-05-21 Revised:2025-08-08 Online:2025-10-25 Published:2025-11-04

摘要: 以U75V钢轨为研究对象,通过系统设计等温热处理工艺获得不同片层间距的珠光体组织,利用摩擦磨损试验研究了钢轨试样在不同接触应力下的磨损失效机制,并探究片层间距与抗接触损伤性能之间的相关性。结果表明:降低等温温度能够细化珠光体片层间距。等温温度为520 ℃时,珠光体片层间距最小,约为280 nm,等温温度为630 ℃时,珠光体片层间距粗化至501 nm。硬度随珠光体片层间距的减小而逐渐升高,珠光体片层间距最小的520 ℃等温试样的硬度为257 HBW,相比珠光体片层间距最大的630 ℃等温试样高15.8%。珠光体片层间距小,U75V钢的摩擦因数和磨损量低,其耐磨性能更优。随着接触载荷的增加,U75V钢的磨损失效机制由磨粒磨损逐渐向疲劳磨损转变,并有氧化磨损出现,磨损程度加剧。

关键词: U75V钢轨, 珠光体片层间距, 接触损伤, 力学性能

Abstract: The wear failure mechanism of the steel rail specimens of U75V steel with different interlayer spacing pearlite through systematic designed isothermal heat treatment process was studied by friction and wear test under different contact stresses, and the correlation between interlayer spacing and contact damage resistance was explored. The results show that reducing the isothermal temperature can refine the interlayer spacing of pearlite. When the isothermal temperature is 520 ℃, the minimum pearlite interlayer spacing of about 280 nm is obtained, and when the isothermal temperature is 630 ℃, the pearlite interlayer spacing is coarsened to 501 nm. The hardness of the steel rail gradually increases with the decrease of pearlite interlayer spacing. The hardness of the 520 ℃ isothermal specimen with the minimum pearlite interlayer spacing is 257 HBW, which is 15.8% higher than that of the 630 ℃ isothermal specimen with the maximum pearlite interlayer spacing. The smaller of the pearlite interlayer spacing is, the lower of the friction coefficient and wear amount are, and the better the wear resistance is. With the increase of contact load, the wear failure mechanism of the U75V steel gradually changes from abrasive wear to fatigue wear and oxidative wear occurs, and the wear degree exacerbates.

Key words: U75V steel rail, interlayer spacing of pearlite, contact damage, mechanical properties

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