激光熔覆与激光－感应复合熔覆WC-Ni60A涂层的结构与性能特征

摘要/Abstract

摘要： 对单纯激光熔覆与激光－感应复合熔覆Ni60A+35% WC涂层的几何外形、稀释率、WC颗粒分布、显微组织与抗干滑动磨损性能进行对比分析。结果表明，单纯激光熔覆的最大激光扫描速度与最大送粉量仅为600 mm•min–1与25 g•min–1，当激光－感应复合熔覆采用相同的工艺参数时，复合熔覆层的宽度、热影响区、稀释率均大于单纯激光熔覆层，厚度却小于单纯激光熔覆层，WC颗粒与析出的碳化物不均匀地分布于复合熔覆层内，复合熔覆层的抗干滑动磨损性能比单纯激光熔覆层的差。但是，激光－感应复合熔覆的最大激光扫描速度可以提高到2 200 mm•min–1，最大送粉量可以提高到75.6 g•min–1，加工效率是单纯激光熔覆的3倍多，复合熔覆层内WC颗粒分布均匀，经检测无裂纹且稀释率仅为5.2%，抗干滑动磨损性能约是单纯激光熔覆层的1.42倍。

关键词: WC, 激光－感应复合熔覆, 激光熔覆, 显微组织

Abstract: The geometrical profiles, dilution, WC distribution, microstructure and dry sliding wear resistance of Ni60A+35% WC coatings by individual laser cladding and laser-induction hybrid cladding are analyzed and compared. The results show that the maximum laser scanning speed and the maximum rate of powder feeding are only 600 mm• min–1 and 25 g•min–1, respectively. If the same processing parameters are adopted during laser-induction hybrid cladding, the width, the heat-affected-zone and the dilution of coating are larger than those of coating by individual laser cladding, but the height of coating is lower than that of coating by individual laser cladding and the dry sliding wear resistance of coating is worse than that of coating by individual laser cladding. However, the maximum laser scanning speed increases to 2 200 mm•min–1 and the maximum rate of powder feeding increases to 75.6 g•min–1 during laser-induction hybrid cladding, whose processing efficiency is much three times higher than that of individual laser cladding. WC particles distribute homogeneously and no cracks are detected in the coating with a dilution of less than 5.2%, whose dry sliding wear resistance is approximately 1.42 times higher than that of coating by individual laser cladding

Key words: Laser cladding, Microstructure, WC, Laser-induction hybrid cladding

中图分类号:

TG113

周圣丰;戴晓琴;郑海忠. 激光熔覆与激光－感应复合熔覆WC-Ni60A涂层的结构与性能特征[J]. , 2012, 48(7): 113-118.

ZHOU Shengfeng;DAI Xiaoqin;ZHENG Haizhong. Characteristics on Structure and Properties of WC-Ni60A Coatings by Laser Cladding and Laser-induction Hybrid Cladding[J]. , 2012, 48(7): 113-118.

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激光熔覆与激光－感应复合熔覆WC-Ni60A涂层的结构与性能特征

Characteristics on Structure and Properties of WC-Ni60A Coatings by Laser Cladding and Laser-induction Hybrid Cladding

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