糖心产精国品免费入口*完整版糖心产精国品免费入口*完整版的损伤行为
Damage Behavior of U71Mn Steel Rail Gas Pressure Welded Joint
摘 要
采用糖心产精国品免费入口*完整版计、轮廓仪、光学显微镜、扫描电子显微镜等对服役后的糖心产精国品免费入口*完整版糖心产精国品免费入口*完整版的糖心产精国品免费入口*完整版、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；轮轨接触使接头糖心产精国品免费入口*完整版提高，但是软化区的糖心产精国品免费入口*完整版始终低于母材；根据糖心产精国品免费入口*完整版形态，接头从中心向两侧热影响区可依次分为层片状糖心产精国品免费入口*完整版区域、部分糖心产精国品免费入口*完整版球化区I、糖心产精国品免费入口*完整版球化区、部分糖心产精国品免费入口*完整版球化区Ⅱ；软化区位于糖心产精国品免费入口*完整版球化区；糖心产精国品免费入口*完整版球化区与部分糖心产精国品免费入口*完整版球化区的裂纹深度和裂纹尖端扩展角都较大，这是由于粒状糖心产精国品免费入口*完整版对裂纹扩展的阻力较小导致的。
糖心产精国品免费入口*完整版
糖心产精国品免费入口*完整版
糖心产精国品免费入口*完整版
裂纹扩展
U71Mn steel rail
糖心产精国品免费入口*完整版
糖心产精国品免费入口*完整版
糖心产精国品免费入口*完整版
crack growth
Abstract
The 糖心产精国品免费入口*完整版, crack morphology and microstructure of U71Mn steel rail 糖心产精国品免费入口*完整版 after service were tested and observed by 糖心产精国品免费入口*完整版 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 糖心产精国品免费入口*完整版 of the joint increased because of wheel-rail contact, but the 糖心产精国品免费入口*完整版 of the softening zone was always lower than that of the base metal. According to morphology of 糖心产精国品免费入口*完整版, the joint was divided into four regions from the joint center to heat-affected zone on both sides: lamellar 糖心产精国品免费入口*完整版 area, partial 糖心产精国品免费入口*完整版 spheroidization area I, 糖心产精国品免费入口*完整版 spheroidization area and partial 糖心产精国品免费入口*完整版 spheroidization area Ⅱ. The softening zone was located in 糖心产精国品免费入口*完整版 spheroidization area. The depths of cracks and the expansion angles of crack tips in 糖心产精国品免费入口*完整版 spheroidization and partial 糖心产精国品免费入口*完整版 spheroidization areas were relatively large, because of the relative small resistance of granular 糖心产精国品免费入口*完整版 to crack growth.
中图分类号 TH117.1DOI 10.11973/jxgccl202102008
所属栏目 材料性能及应用
基金项目 四川省国际科技创新合作项目（2019YFH0094）；国家自然科学基金资助项目（51775455）
收稿日期 2020/2/26
修改稿日期 2020/10/29
网络出版日期
作者单位
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备注糖心产精国品免费入口*完整版(1982-),女,青海湟源人,博士研究生
引用该论文: JIANG Wenjuan,WANG Wenjian,DING Haohao,GUO Jun,LIU Qiyue. Damage Behavior of U71Mn Steel Rail Gas Pressure Welded Joint[J]. Materials for mechancial engineering, 2021, 45(2): 43～48
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参考文献
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【2】 卢祖文. 高速铁路轨道技术综述[J]. 铁道工程学报, 2007(1):41-54. LU Z W. Overall comments on track technology of high-speed railway[J].Journal of Railway Engineering Society, 2007(1):41-54.
【3】 FRANK N. New rail could solve rolling contact fatigue[J]. International Railway Journal and Rapid Transit Review, 2003, 43(5):49-50.
【4】 郝世亮. 大秦万吨列车通道钢轨伤损发展分析及对策[J]. 中国铁路, 2004(12):30-33. HAO S L.Development analysis and countermeasures of rail injury of Daqin ten-thousand-ton train channel[J].Chinese Railways, 2004(12):30-33.
【5】 袁昊. 城市铁路钢轨伤损状况分析及对策研究[J]. 铁道标准设计, 2005(12):22-24. YUAN H. Analysis and countermeasure research of rail injury of urban railway[J].Railway Standard Design, 2005(12):22-24.
【6】 陈明鸣,车小莉,黄为,等.成昆线在线钢轨焊接接头断裂分析[J].电焊机,2004,34(10):46-48. CHEN M M, CHE X L, HUANG W, et al. Investigation on rail fracture of Chengdu-Kunming railway[J].Electric Welding Machine, 2004,34(10):46-48.
【7】 王莹莹.钢轨闪光焊接头灰斑和微裂纹缺陷形成机理研究[D].北京:中国铁道科学研究院,2018. WANG Y Y. Research on formation mechanism of flat spots and micro-crack defects in rail welded joints[D]. Beijing:China Academy of Railway Sciences, 2018.
【8】 KIM Y J,SCHWALBE K H. Numerical analyses of strength mis-match effect on local stresses for ideally plastic materials[J].Engineering Fracture Mechanics, 2004,71(7/8):1177-1199.
【9】 邢丽贤.提速条件下钢轨伤损特点及钢轨伤损分类的研究[D].北京:中国铁道科学研究院,2008. XING L X.Research on defect characteristics and classification of higher speed rails[D].Beijing:China Academy of Railway Sciences, 2008.
【10】 STEENBERGEN M M,ESVELD C. Relation between the geometry of rail welds and the dynamic wheel - rail response:Numerical simulations for measured welds[J].Proceedings of the Institution of Mechanical Engineers,Part F:Journal of Rail and Rapid Transit, 2006,220(4):409-423.
【11】 邓永果,李伟,温泽峰,等.轮轨相互作用下钢轨焊接接头表面裂纹扩展分析[J].应用力学学报,2013,30(4):624-629. DENG Y G, LI W, WEN Z F, et al.Analysis of crack propagation on rail weld surface under wheel/rail interaction[J].Chinese Journal of Applied Mechanics, 2013,30(4):624-629.
【12】 钟元. 重裁铁路用钢轨气压焊工艺研究[D]. 成都:西南交通大学, 2014. ZHON Y.Research on pneumatic welding technology of rail for recutting railway[D]. Chengdu:Southwest Jiaotong University, 2014.
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