激光技术2026，Vol.50Issue(2)：179-184,6.DOI:10.7510/jgjs.issn.1001-3806.2026.02.004
激光熔覆制备钼和In718复合熔覆层性能研究
Study on performance of molybdenum and In718 composite cladding layer fabricated by laser cladding
摘要
Abstract
To address the challenge of poor wear resistance on the surface of Inconel718(In718),this study employed laser cladding technology to fabricate Mo-enriched composite coatings on In718 substrates.During the cladding process,nitrogen gas was used as the shielding atmosphere to prevent oxidation and to assist in the in-situ formation of nitrides.A series of comprehensive characterization techniques were employed to evaluate the structural and tribological properties of the coatings,including X-ray diffractometer(XRD)for phase identification,scanning electron microscopy(SEM)for microstructural analysis,microhardness testing,and high-temperature friction and wear tests. The results demonstrated that the primary phases present in the cladded layers included the matrix phases Ni-Cr-Co-Mo and(Fe,Ni)solid solution,as well as hard phases such as Mo2N and elemental Mo.The microstructure of the coatings was characterized by a dendritic morphology,where long,directionally aligned dendrites were clearly observed,and secondary phase particles were dispersedly dispersed in the interdendritic regions.The metallic Mo were the newly generated Mo particles in the melt pool.Microzone orientation was formed around the Mo particles,which led to further refinement of the grain size.The maximum microhardness of the coating reached 645 HV0.5,which is approximately 2.8 times higher than that of the In718 substrate(230 HV0.5).This substantial enhancement in hardness was primarily attributed to solid solution strengthening induced by the Mo element and the synergistic effects of hard phases like Mo2N. The wear surfaces of the coatings exhibited the formation of MoO3 during the frictional process at elevated temperatures.MoO3,which is known for its layered crystal structure,contributed to significant friction reduction due to its excellent solid lubrication characteristics.As a result,the coefficient of friction(COF)for the Mo-enriched cladded layer was as low as 0.3714.The predominant wear mechanism was identified as abrasive wear,accompanied by mild oxidative wear. The findings reveal the effect of Mo content on the microstructure and tribological performance of laser-cladded In718 coatings.The study offers a theoretical and experimental foundation for future optimization of cladding process parameters in engineering applications requiring enhanced surface wear resistance.关键词
激光技术/摩擦磨损性能/耐磨熔覆层/In718Key words
laser technique/tribological performance/wear-resistant cladding layer/In718分类
信息技术与安全科学引用本文复制引用
张静,张雯,庞铭,高明杰..激光熔覆制备钼和In718复合熔覆层性能研究[J].激光技术,2026,50(2):179-184,6.基金项目
国家自然科学基金资助项目(52075559) （52075559）
