灰铸铁表面单道激光熔覆Ni45A+5%WC合金形貌研究

郭士锐; 赵阳; 崔陆军; 崔英浩; 李晓磊; 郑博

doi:doi:10.14128/j.cnki.al.20224203.021

应用激光, 2022, 42 (3): 21, 网络出版: 2023-01-03

灰铸铁表面单道激光熔覆Ni45A+5%WC合金形貌研究

Study on the Morphology of Single-pass Laser Cladding Ni45A+5%WC Coating on the Surface of Gray Cast Iron

论文大纲

郭士锐 ^*赵阳崔陆军崔英浩李晓磊郑博

作者单位

中原工学院机电学院，河南郑州 450007

灰铸铁激光熔覆稀释率正交试验宽高比工艺优化 gray cast iron laser cladding dilution rate orthogonal experiment aspect ratio process optimization

摘要

为探究灰铸铁表面激光熔覆镍基WC合金的最佳工艺参数，改善灰铸铁表面熔覆质量，避免因其选择不佳产生缺陷，利用高功率半导体光纤耦合激光器制备单道涂层，通过Leica光学显微镜对熔覆层几何特征进行测量，结合正交极差分析数据获取极差结果，并根据因素效应图分析工艺参数对几何特征的影响机制，通过稀释率和宽高比的等值线图及实际工程需求优化工艺参数范围进行优化选取，最后结合实际工程成本探究出最佳工艺参数。结果表明：三因素对熔覆层几何特征具有重大影响且激光功率为主要影响因素。最佳工艺参数为激光功率1 400 W，扫描速度5.8 mm/s，送粉速率15.5 g/min。最优工艺参数下熔覆层高度为1 540.5 μm，熔宽为4 680.5 μm，熔深为88.9 μm，稀释率为5.46%，宽高比为3.04，均满足实际需求。研究为工程实践提供了理论基础及参考依据。

Abstract

This paper explores the optimal process parameters of laser cladding nickel-based WC alloy on the surface of gray cast iron to improve the surface cladding quality of gray cast iron and avoid defects due to poor selection. Single-pass coatings were prepared by using high-power semiconductor fiber-coupled laser, and the geometric characteristics of the cladding layer were measured by using Leica optical microscope. The range results were obtained by analyzing experimental data using orthogonal range method, and the influence mechanism of the process parameters on the geometric characteristics was analyzed according to the factor effect diagram. The contour diagram of the dilution rate and the aspect ratio optimizes the range of the better process parameters according to the actual needs and finally optimizes the optimal process parameters based on the actual engineering cost. The results show that three factors have a significant impact on the geometric characteristics of the cladding layer, and laser power is the main influencing factor. The optimal process parameters are that laser power is 1 400 W, scanning speed is 5.8 mm/s, powder feeding rate is 15.5 g/min. Under the optimal process parameters, the height of the cladding layer is 1 540.5 μm, the melting width is 4 680.5 μm, the penetration depth is 88.9 μm, the dilution rate is 5.46%, and the aspect ratio is 3.04, which all meet the actual needs. This research provides a theoretical basis and reference basis for engineering practice.

参考文献

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郭士锐, 赵阳, 崔陆军, 崔英浩, 李晓磊, 郑博. 灰铸铁表面单道激光熔覆Ni45A+5%WC合金形貌研究[J]. 应用激光, 2022, 42(3): 21. Guo Shirui, Zhao Yang, Cui Lujun, Cui Yinghao, Li Xiaolei, Zheng Bo. Study on the Morphology of Single-pass Laser Cladding Ni45A+5%WC Coating on the Surface of Gray Cast Iron[J]. APPLIED LASER, 2022, 42(3): 21.

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