• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (4): 167-175.doi: 10.3901/JME.2018.04.167

• 轮轨滚动接触疲劳 • 上一篇    下一篇

不同蠕滑率下U75V钢轨磨损与损伤性能分析

郭立昌, 朱文涛, 何成刚, 马蕾, 王文健, 刘启跃   

  1. 西南交通大学摩擦学研究所 成都 610031
  • 收稿日期:2017-04-15 修回日期:2018-01-12 出版日期:2018-02-20 发布日期:2018-02-20
  • 通讯作者: 刘启跃(通信作者),男,1964年出生,博士,教授,博士研究生导师。研究方向为轮轨系统摩擦学与服役行为。E-mail:liuqy@home.swjtu.edu.cn
  • 作者简介:郭立昌,男,1983年出生,博士研究生。研究方向为轮轨系统摩擦学。E-mail:glc0206@163.com
  • 基金资助:
    国家自然科学基金(51775455,51575460)和四川省青年科技创新研究团队(2017TD0017)资助项目

Analysis on Wear and Damage Characteristics of U75V Rail under Different Slip Ratio Conditions

GUO Lichang, ZHU Wentao, HE Chenggang, MA Lei, WANG Wenjian, LIU Qiyue   

  1. Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031
  • Received:2017-04-15 Revised:2018-01-12 Online:2018-02-20 Published:2018-02-20

摘要: 利用MJP-30A滚动磨损试验机研究U75V钢轨在不同蠕滑率下的磨损与损伤行为,探讨钢轨磨损率随蠕滑率的转变规律。结果表明:U75V钢轨磨损率随蠕滑率的增加呈现"台阶式"上升规律;根据Tγ/A-磨损率变化曲线,可将U75V钢轨材料磨损划分为三个区域:轻微磨损区、严重磨损区和灾难性磨损区。不同蠕滑率下U75V钢轨的磨损与损伤机制明显不同;当蠕滑率小于3%时钢轨材料主要磨损形式为氧化磨损与轻微疲劳磨损,当蠕滑率为6%~12%时钢轨材料主要磨损形式为轻微黏着磨损,当蠕滑率为18%~25%时钢轨材料主要磨损形式为严重黏着磨损;随蠕滑率增加,钢轨材料塑性变形层厚度、疲劳裂纹的深度和角度均呈先增加后减小的趋势,当蠕滑率为12%~18%时、塑性变形层厚度、疲劳裂纹的深度和角度达到最大。

关键词: Tγ/A-磨损率, 钢轨材料, 磨损, 蠕滑率, 损伤

Abstract: The wear and damage behaviors of U75V rail under different slip ratio conditions are explored using a MJP-30A rolling wear testing machine. The wear rate change of rail material is investigated with the slip ratio increasing. The results indicate that the wear rate of U75V rail material shows a rising trend of "step" style with the slip ratio increasing. According to the Tγ/A-wear rate mapping, three wear regions including mild wear area, severe wear area and catastrophic wear area can be divided. Under different slip ratio conditions, the wear and damage mechanism of rail material is obviously different. When the slip ratio is below 3%, main wear damage of rail material is oxidative wear and mild fatigue wear. As the slip ratio rises to 6% and 12%, main wear damage is light abrasive wear. While, at the slip ratio of 18% and 25%, main wear damage is serious abrasive wear. With an increase of slip ratio, the thickness of rail material plastic deformation layer, propagation depth and angle of fatigue cracks both present a trend of first increasing and then decreasing. When the range of slip rate is 12%~18%, the thickness of rail material plastic deformation layer, the propagation depth and angle of fatigue crack reach the maximum.

Key words: Tγ/A-wear rate, damage, rail material, slip ratio, wear

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