激光熔覆修复EA4T车轴钢显微组织和强度评价

doi:10.11896/cldb.21070180

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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

Published: Online: 2022-04-07

CLC number:

TG142

Fund:Key Research and Development Programs of Sichuan Province (2021YFG0210), and the Independent Programs of the State Key Laboratory of Traction Power (2019TPL-T021).

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	Articles by authors
	XIAO Peng
	GAO Jiewei
	LIU Ligen
	HAN Jing

Cite this article:

XIAO Peng,GAO Jiewei,LIU Ligen, et al. Microstructure and Strength Evaluation of EA4T Axle Steel Repaired by Laser-cladding[J]. Materials Reports, 2022, 36(7): 21070180-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21070180 OR http://www.mater-rep.com/EN/Y2022/V36/I7/21070180

1 Chen W J, Chen H, Li C C, et al.Engineering Failure Analysis, 2017, 79, 120.
2 Hou Y Z, Li S L, Qi X S, et al.Electric Welding Machine, 2020, 50(2), 69(in Chinese).
侯有忠, 李世亮, 齐先胜, 等.电焊机, 2020, 50(2), 69.
3 Hou Y Z, Qi X S, Deng H J, et al.Surface Technology, 2020, 49(12), 162(in Chinese).
侯有忠, 齐先胜, 邓鸿剑, 等.表面技术, 2020, 49(12), 162.
4 Yang B, Liao Z, Wu S C, et al.Journal of Traffic and Transportation Engineering, 2021, 21(1), 132(in Chinese).
杨冰, 廖贞, 吴圣川, 等.交通运输工程学报, 2021, 21(1), 132.
5 Pang X T, Gong Q F, Wang Z J, et al.Chinese Journal of Lasers, 2020, 47(11), 51(in Chinese).
庞小通, 龚群甫, 王志杰, 等. 中国激光, 2020, 47(11), 51.
6 Yu M, Zhang H Y, Cao K, et al. Surface Technology, 2020, 49(10), 12(in Chinese).
余敏, 张鸿羽, 曹开, 等.表面技术, 2020, 49(10), 12.
7 Qi X S, Hou Y Z, Nu F J, et al. Electric Welding Machine, 2017, 47(10), 8(in Chinese).
齐先胜, 侯有忠, 牛富杰, 等.电焊机, 2017, 47(10), 8.
8 Hua J W. Study on laser cladding Mo based coating for EA4T axle steel.Master's Thesis, Southwest Jiaotong University, China, 2018(in Chinese).
华俊伟. EA4T车轴钢激光熔覆Mo基涂层研究.硕士学位论文, 西南交通大学, 2018.
9 Shao S, Khonsari M M, Guo S, et al.Additive Manufacturing, 2019, 29, 100779.
10 Cai Q, Chen W J, Chen X N, et al.Journal of Xihua University(Natural Science), 2017, 36(2), 33(in Chinese).
蔡擎, 陈文静, 陈晓男,等.西华大学学报(自然科学版), 2017, 36(2), 33.
11 Li C C, Chen W J, Xiang C, et al.Electric Welding Machine, 2016, 46(5), 73(in Chinese).
李丛辰, 陈文静, 向超, 等.电焊机, 2016, 46(5), 73.
12 Xu Y H, Zhang C H, Zhang S, et al. Journal of Materials Engineering, 2020, 48(11), 147(in Chinese).
徐昀华, 张春华, 张松, 等. 材料工程, 2020, 48(11), 147.
13 Xie Y J, Yang Y L, Chi C T, et al. Transactions of the China Welding Institution, 2020, 41(5), 19(in Chinese).
谢玉江, 杨玉乐, 迟长泰, 等.焊接学报, 2020, 41(5), 19.
14 Yang C, Dong Z H, Chi C T, et al. Chinese Journal of Lasers, 2020, 47(5), 380(in Chinese).
杨晨, 董志宏, 迟长泰, 等. 中国激光, 2020, 47(5), 380.
15 Chen L, Chen W J, Huang Q, et al.Journal of Materials Engineering, 2019, 47(5), 79(in Chinese).
陈林, 陈文静, 黄强, 等.材料工程, 2019, 47(5), 79.
16 Peng Q, Dong S Y, Kang X L, et al. Chinese Journal of Engineering, 2018, 40(11), 1342(in Chinese).
彭谦, 董世运, 康学良, 等. 工程科学学报, 2018, 40(11), 1342.
17 Zhang W, Dong Z, Kang H, et al.Journal of Materials Processing Technology, 2021, 288, 116907.
18 Cui X, Zhang S, Wang C, et al.Materials Science & Engineering A-Structural Materials, Properties, Microstructure and Processing, 2020, 791, 139738.
19 Tucho W M, Cuvillier P, Sjolyst-Kverneland A, et al.Materials Science & Engineering A-Structural Materials, Properties, Microstructure and Processing, 2017, 689, 220.
20 Yang G, Ding L L, Wang X M, et al. Infrared and Laser Engineering, 2015, 44(10), 2926(in Chinese).
杨光, 丁林林, 王向明, 等. 红外与激光工程, 2015, 44(10), 2926.
21 Ni Q X, Wang Z Y, Wang Z M, et al. Heat Treatment of Metals, 2020, 45(5), 129(in Chinese).
倪启校, 王占勇, 王泽民, 等.金属热处理, 2020, 45(5), 129.
22 Luo S, Nie X, Zhou L, et al.Journal of Materials Engineering and Performance, 2018, 27(3), 1466.
23 Kou S.Welding metallurgy, Higher Education Press, China, 2012, pp.155(in Chinese).
柯伸道.焊接冶金学, 高等教育出版社, 2012, pp.155.
24 Li D S, Liu J C. Materials for Mechanical Engineering, 2008, 32(2), 8(in Chinese).
李大生, 刘继常. 机械工程材料. 2008, 32(2), 8.
25 Xiang Y, Zhang S Z, Wei Z Y, et al. Applied Physics A, 2018, 124(10), 685.