电焊机2025，Vol.55Issue(12)：17-25,9.DOI:10.7512/j.issn.1001-2303.2025.12.03
稀土对超高速激光熔覆LZ50车轴微观组织及性能的影响
Effect of Rare Earth on Microstructure and Properties of LZ50 Axle Remanufactured by Ultra-high Speed Laser Cladding
摘要
Abstract
Ultra-high-speed laser cladding technology was employed to fabricate Fe-Cr-Ni and Fe-Cr-Ni+0.8wt.%CeO2 composite coatings on the surface of LZ50 axles.The microstructure and phase composition of the coatings were character-ized using scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD).The mechanical properties of the cladding layers were evaluated through microhardness tests,Charpy impact tests,and tensile tests.Results indicate that both coatings formed excellent metallurgical bonding with the substrate,primarily consisting of austenite,(Fe,Ni)solid solution,and(Cr,Fe)7C3 carbides.The addition of CeO2 reduced porosity and refined grain structure within the coating.Mechanical property testing revealed that the Fe-Cr-Ni+CeO2 coating achieved an average microhardness of 456.38 HV0.2,representing a 33%improvement compared to the CeO2-free coating.The tensile strength and yield strength increased by 23.51%and 14.1%,reaching 912 MPa and 597 MPa,respectively,while the elongation and reduction in cross-sectional area improved synchronously to 9.3%and 18.9%.The average impact toughness increased by 8.05%,attaining 34.9 J,which approaches the level of the LZ50 substrate.This study confirms that rare earth CeO2 modification effectively optimizes the microstructure and mechanical properties of ultra-high-speed laser-clad Fe-Cr-Ni coatings,providing theoreti-cal foundations and technical support for high-performance remanufacturing of damaged LZ50 axles.关键词
超高速激光熔覆/LZ50车轴钢/CeO2/微观组织/力学性能Key words
ultra-high-speed laser cladding/LZ50 axle steel/CeO2/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
TAN Bo,CHEN Wenjing,LIU Chuihua,YANG Chen,LUO Qingsong..稀土对超高速激光熔覆LZ50车轴微观组织及性能的影响[J].电焊机,2025,55(12):17-25,9.基金项目
国家自然科学基金项目(52375387) （52375387）
