| U71Mn钢轨气压焊接头的损伤行为 |
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| 引用本文： | 蒋文娟,王文健,丁昊昊,郭俊,刘启跃. U71Mn钢轨气压焊接头的损伤行为[J]. 机械工程材料, 2021, 45(2): 43-48. DOI: 10.11973/jxgccl202102008 |
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| 作者姓名： | 蒋文娟 王文健 丁昊昊 郭俊 刘启跃 |
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| 作者单位： | 西南交通大学,牵引动力国家重点实验室摩擦学研究所,成都 610031;四川工程职业技术学院材料工程系,德阳 618000;西南交通大学,牵引动力国家重点实验室摩擦学研究所,成都 610031;西南交通大学,牵引动力国家重点实验室摩擦学研究所,成都 610031;西南交通大学,牵引动力国家重点实验室摩擦学研究所,成都 610031;西南交通大学,牵引动力国家重点实验室摩擦学研究所,成都 610031 |
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| 基金项目： | 国家自然科学基金资助项目;四川省国际科技创新合作项目 |
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| 摘 要： | 采用硬度计、轮廓仪、光学显微镜、扫描电子显微镜等对服役后的U71Mn钢轨气压焊接头的硬度、裂纹形貌及显微组织进行测试与观察,分析接头不同区域的损伤行为.结果表明:焊接接头两侧距接头中心30～50 mm处存在低凹区域,其位置与软化区位置吻合;轮轨接触使接头硬度提高,但是软化区的硬度始终低于母材;根据珠光体形态,接头从中心...
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| 关 键 词： | U71Mn钢轨 气压焊接头 硬度 珠光体 裂纹扩展 |
Damage Behavior of U71Mn Steel Rail Gas Pressure Welded Joint |
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| JIANG Wenjuan,WANG Wenjian,DING Haohao,GUO Jun,LIU Qiyue. Damage Behavior of U71Mn Steel Rail Gas Pressure Welded Joint[J]. Materials For Mechanical Engineering, 2021, 45(2): 43-48. DOI: 10.11973/jxgccl202102008 |
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| Authors: | JIANG Wenjuan WANG Wenjian DING Haohao GUO Jun LIU Qiyue |
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| Affiliation: | (Tribology Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;Department of Materials Engineering,Sichuan Engineering Technical College,Deyang 618000,China) |
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| Abstract: | The hardness,crack morphology and microstructure of U71 Mn steel rail gas pressure welded joint after service were tested and observed by hardness tester,profilometer,optical microscope and scanning electron microscope.The damage behavior in different regions of the joint was analyzed.The results show that the depressions were located at 30-50 mm away from the joint center on both sides,and their positions were consistent with the softening zones in the joint.The hardness of the joint increased because of wheel-rail contact,but the hardness of the softening zone was always lower than that of the base metal.According to morphology of pearlite,the joint was divided into four regions from the joint center to heat-affected zone on both sides:lamellar pearlite area,partial pearlite spheroidization area I,pearlite spheroidization area and partial pearlite spheroidization areaⅡ.The softening zone was located in pearlite spheroidization area.The depths of cracks and the expansion angles of crack tips in pearlite spheroidization and partial pearlite spheroidization areas were relatively large,because of the relative small resistance of granular pearlite to crack growth. |
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| Keywords: | U71Mn steel rail gas pressure welded joint hardness pearlite crack growth |
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