Modeling of process parameters and wear performance investigation of Inconel 625 nickel-based coatings via laser cladding

Yufeng Wu, Xuming Wu, Lincong Li, Bin Li, Zhaohui Wang
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Abstract

In this study, laser cladding technology was employed to fabricate Inconel 625 coatings on the surface of 15CrMo alloy steel. The formation appearance, melt width, dilution rate, composition, microstructure, microhardness, and wear behavior of the coatings were investigated using X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness testing, wear testing machines, and laser confocal microscopy. Experimental results indicate that an optimal linear energy range of 10.8–14.4 W·min/mm and a powder feeding density range of 0.125–0.16 g/mm yield high-quality coatings with well-formed structures, refined grains, and enhanced microhardness. For the first time, the concept of powder feeding density was introduced. Based on the functional relationships between linear energy, powder feeding density, and coating characteristics, bead width and dilution rate models for Inconel 625 coatings were established, providing a theoretical basis for engineers to optimize the laser cladding process. Furthermore, friction and wear test results demonstrated that the coatings possess excellent wear resistance under optimal parameters, with the primary wear mechanisms being adhesive wear and oxidative wear.
通过激光熔覆 Inconel 625 镍基涂层的工艺参数建模和磨损性能研究
本研究采用激光熔覆技术在 15CrMo 合金钢表面制造 Inconel 625 涂层。采用 X 射线衍射 (XRD)、光学显微镜、扫描电子显微镜 (SEM)、能量色散光谱 (EDS)、显微硬度测试、磨损试验机和激光共聚焦显微镜对涂层的形成外观、熔体宽度、稀释率、成分、显微结构、显微硬度和磨损行为进行了研究。实验结果表明,最佳线性能量范围为 10.8-14.4 W-min/mm,粉末进料密度范围为 0.125-0.16 g/mm,可获得具有良好成型结构、细化晶粒和增强显微硬度的高质量涂层。首次引入了送粉密度的概念。根据线性能量、送粉密度和涂层特性之间的函数关系,建立了 Inconel 625 涂层的珠宽和稀释率模型,为工程师优化激光熔覆工艺提供了理论依据。此外,摩擦和磨损测试结果表明,涂层在最佳参数下具有优异的耐磨性,主要磨损机制是粘着磨损和氧化磨损。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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