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材料导报  2022, Vol. 36 Issue (7): 21070180-7    https://doi.org/10.11896/cldb.21070180
  表面工程材料与技术 |
激光熔覆修复EA4T车轴钢显微组织和强度评价
肖棚1,2, 高杰维3,4, 刘里根1,2, 韩靖1,2
1 西南交通大学材料先进技术教育部重点实验室,成都 610031
2 西南交通大学材料科学与工程学院,成都 610031
3 电子科技大学机械与电气工程学院,成都 611731
4 西南交通大学牵引动力国家重点实验室,成都 610031
Microstructure and Strength Evaluation of EA4T Axle Steel Repaired by Laser-cladding
XIAO Peng1,2, GAO Jiewei3,4, LIU Ligen1,2, HAN Jing1,2
1 Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
2 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
3 School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
4 State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
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摘要 激光熔覆技术可修复表面损伤的高速列车车轴,延长车轴使用寿命,降低车轴报废率。本研究在EA4T车轴钢表面激光熔覆24CrNiMo合金粉末,并探索热处理(HT)对熔覆层性能的影响。利用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)、维氏硬度计及万能试验机分析了熔覆层的组织形貌、显微硬度及拉伸性能。通过四点弯曲疲劳试验测定了试件的疲劳性能。结果表明:熔覆层内部组织主要由胞状枝晶、柱状晶和取向随机的细小枝晶组成。由于熔覆层细晶强化以及回火马氏体的形成,显微硬度、拉伸强度和屈服强度远高于基体。热处理后,由于晶粒粗化和回火索氏体的形成,熔覆层硬度和强度下降、塑韧性提高,并且试样疲劳强度较原始熔覆试样有所下降。熔覆试样呈现出含解理台阶和撕裂棱的微解理型断口,热处理后呈现出含准解理裂纹断口的形貌特征。
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肖棚
高杰维
刘里根
韩靖
关键词:  激光熔覆  EA4T车轴钢  微观组织  疲劳性能    
Abstract: In order to prolong the service life and reduce the scrap rate of high-speed train axles, laser cladding remanufacturing was used to repair the damaged surface of axles. In this study, 24CrNiMo alloy powder was cladding on EA4T axle steel surface, and the effect of heat treatment(HT) on the properties of the cladding layer was investigated. The microstructure, microhardness and tensile properties of the cladding layer were analyzed by optical microscope(OM), scanning electron microscope(SEM), electron backscattering diffraction(EBSD), Vickers hardness tester and universal testing machine. The fatigue strength was measured by four-point bending experiments, and the fatigue fracture was observed. The results showed that the microstructure of the cladding layer was mainly composed of cellular dendrite, columnar crystal and fine dendrites with random orientation. The microhardness, tensile strength and yield strength of the cladding layer were much higher than that of the substrate because of the fine grain strengthening and the formation of tempered martensite. After HT, due to grain coarsening and the formation of tempered sorbite, the hardness and strength of the cladding layer decreased, while the plasticity and toughness increased, and the fatigue strength of the sample decreased compared with the original cladding sample. The fatigue fracture of EA4T steel after laser cladding was a micro-cleavage fracture with cleavage steps and tear ridge, and the fracture after HT appeared quasi-cleavage cracks.
Key words:  laser cladding    EA4T axle steel    microstructure    fatigue performance
发布日期:  2022-04-07
ZTFLH:  TG142  
基金资助: 四川省重点研发计划项目(2021YFG0210);牵引动力国家重点实验室自主课题(2019TPL-T021)
通讯作者:  hanjing@swjtu.edu.cn   
作者简介:  肖棚,2019年6月于西南石油大学获得工学学士学位。现为西南交通大学材料科学与工程学院硕士研究生,在韩靖副教授的指导下进行研究。目前主要研究领域为激光熔覆修复高速列车车轴。
韩靖,西南交通大学材料科学与工程学院副教授,硕士研究生导师。1998年6月毕业于重庆大学金属压力加工专业,获工学学士学位,同年7月到攀枝花钢铁(集团)公司技术质量部工作;2001年考上重庆大学材料加工工程硕士研究生,2004年6月毕业,获工学硕士学位,同年7月到中船重工集团跃进机械厂从事高温合金热处理工艺研究工作;2006年3月考上重庆大学材料科学与工程专业博士研究生,从事金属材料表面自纳米化和异种金属固态扩散连接研究工作,2009年6月毕业,获工学博士学位。同年在西南交通大学材料科学与工程学院工作至今,同时在重庆大学冶金工程博士后流动站从事微合金钢连铸坯表面微裂纹控制研究工作。目前从事的项目:高速列车关键材料及部件可靠性(科技支撑项目);高速动车组关键零部件国产化研发(四川省科技厅项目);高速动车组铝合金牵引梁国产化研制;高速动车组转向架推杆国产化研制;装载挖掘机静强度、疲劳强度校核计算,动载荷测试;时速380公里哈大线高寒动车组转向架关键零部件性能评价与检验。在国内外刊物发表学术论文60余篇。
引用本文:    
肖棚, 高杰维, 刘里根, 韩靖. 激光熔覆修复EA4T车轴钢显微组织和强度评价[J]. 材料导报, 2022, 36(7): 21070180-7.
XIAO Peng, GAO Jiewei, LIU Ligen, HAN Jing. Microstructure and Strength Evaluation of EA4T Axle Steel Repaired by Laser-cladding. Materials Reports, 2022, 36(7): 21070180-7.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21070180  或          http://www.mater-rep.com/CN/Y2022/V36/I7/21070180
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