激光重熔Ni60/50%WC复合涂层的制备及性能

doi:10.13251/j.issn.0254-6051.2021.05.040

金属热处理 ›› 2021, Vol. 46 ›› Issue (5): 229-234.DOI: 10.13251/j.issn.0254-6051.2021.05.040

激光重熔Ni60/50%WC复合涂层的制备及性能

张蕾涛^1,2, 李海涛², 贾润楠², 王喆², 樊帅奇², 王雪松¹, 戴娇燕¹, 徐金富^1,2

1.宁波工程学院材料与化学工程学院, 浙江宁波 315211;
2.长安大学材料科学与工程学院, 陕西西安 710061

收稿日期:2020-10-27 出版日期:2021-05-25 发布日期:2021-07-21
通讯作者: 徐金富,教授,博士,E-mail:xjf7413@sina.com
作者简介:张蕾涛(1995—),男,硕士研究生,主要研究方向为激光表面改性,E-mail:1290231131@qq.com。
基金资助:
宁波市科技计划(2016B100023);宁波市2025重大专项(2019B10084)

Preparation and properties of laser remelted Ni60/50%WC composite coating

Zhang Leitao^1,2, Li Haitao², Jia Runnan², Wang Zhe², Fan Shuaiqi², Wang Xuesong¹, Dai Jiaoyan¹, Xu Jinfu^1,2

1. School of Materials Science and Chemical Engineering, Ningbo University of Technology, Ningbo Zhejiang 315211, China;
2. School of Materials Science and Engineering, Chang'an University, Xi'an Shaanxi 710061, China

Received:2020-10-27 Online:2021-05-25 Published:2021-07-21

摘要/Abstract

摘要： 为消除Ni60/50%WC复合涂层的裂纹及孔洞等缺陷,采用CO₂激光器在45钢表面进行激光熔覆+重熔处理,利用商用着色探伤剂显示涂层裂纹,通过X射线衍射仪(XRD)和扫描电镜(SEM/EDS)分析涂层的微观组织结构,采用显微硬度计及摩擦磨损试验机等测试复合涂层的硬度和耐磨性能。结果表明,激光重熔能达到二次排渣排气、愈合裂纹,改善表面粗糙度的目的;使用3.0 kW 的激光功率,350 mm/min的扫描速度,50%搭接率,5 g/min送粉量激光熔覆,辅以1.5 kW重熔功率,300 mm/min扫描速度,50%搭接率的重熔可以获得无裂纹的涂层;激光重熔能改善涂层组织的不均匀性,提高熔覆层的结晶度和致密性;重熔前后涂层的平均显微硬度分别为740.07和700.02 HV0.2,平均摩擦因数分别为0.475和0.462,磨损率分别为4.223×10^-15和4.874×10^-15 m³/(N·m)。

关键词: 激光熔覆, 激光重熔, WC, Ni60, 裂纹及孔洞

Abstract: To eliminate defects such as cracks and holes in the Ni60/50%WC composite coating, laser cladding+remelting processing were carried out on the 45 steel surface by using CO₂ laser device. The coating cracks were visualized by using commercial colored flaw detection agent, and the microstructure of coating was analyzed by means of X-ray diffraction (XRD) and scanning electron microscope (SEM/EDS). The microhardness and wear resistance of the coating were examined by micro hardness tester and friction and wear tester. The results show that the laser remelting can achieve the goal of secondary slag discharging, crack healing and surface roughness improvement. The crack-free coating can be obtained by laser cladding with laser power of 3.0 kW, scanning rate of 350 mm/min, overlap rate of 50%, powder feeding rate of 5 g/min, combined with laser remelting with remelting power of 1.5 kW, scanning rate of 300 mm /min, and remelting overlap rate of 50%. Laser remelting can improve the non-uniformity of coating microstructure and enhance the crystallinity and density. Before and after laser remelting, the average microhardness of the composite coating is 740.07 and 700.02 HV0.2, the average friction coefficient is 0.475 and 0.462, and the wear rate is 4.223×10^-15 and 4.874×10^-15 m³/(N·m), in each respectively.

Key words: laser cladding, laser remelting, WC, Ni60, cracks and pores

中图分类号:

TG174.4

张蕾涛, 李海涛, 贾润楠, 王喆, 樊帅奇, 王雪松, 戴娇燕, 徐金富. 激光重熔Ni60/50%WC复合涂层的制备及性能[J]. 金属热处理, 2021, 46(5): 229-234.

Zhang Leitao, Li Haitao, Jia Runnan, Wang Zhe, Fan Shuaiqi, Wang Xuesong, Dai Jiaoyan, Xu Jinfu. Preparation and properties of laser remelted Ni60/50%WC composite coating[J]. Heat Treatment of Metals, 2021, 46(5): 229-234.

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激光重熔Ni60/50%WC复合涂层的制备及性能

Preparation and properties of laser remelted Ni60/50%WC composite coating

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