HE Guangzhong, ZHENG Chenggong, LIU Weiliang.Research on Laser Additive Repair Technology for EA4T Axle ofHigh-Speed Rolling Stock[J].Electric Welding Machine, 2022, 52(10): 37-44. DOI： 10.7512/j.issn.1001-2303.2022.10.06.
Research on Laser Additive Repair Technology for EA4T Axle of High-Speed Rolling Stock
To verify the feasibility of laser additive repair technology in the application of high-speed rolling stock axle damage repair, this paper carried out experiments on the relevant laser repair process on the axle substrate, focusing on the influence of laser power and scanning speed on the melt quality, designing different parameter combinations to improve the melt layer morphology during the melting process, and obtaining melt specimens with good surface forming condition respectively. By analyzing and studying the macroscopic cladding morphology, macroscopic metallographic analysis, microhardness, metallographic organization, etc., and the better process parameters were selected, and further mechanical properties such as tensile properties, impact properties, stress corrosion, and fatigue tests were performed on the clad specimens. The result show that, when the optimized process parameters are used to laser cladding IN625 nickel base powder on EA4T, the tensile properties of the cladding specimen are better than the standard requirements of the base material, impact properties better than the impact properties of the base material, and fatigue life comparable to that of the base material, meeting the requirements of the axle service performance, which can be used for the subsequent repair of EA4T axles of high-speed rolling stock.
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