激光工艺参数对Ni60/WC涂层裂纹率及组织的影响

doi:10.13251/j.issn.0254-6051.2021.09.045

金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 252-257.DOI: 10.13251/j.issn.0254-6051.2021.09.045

激光工艺参数对Ni60/WC涂层裂纹率及组织的影响

周建波¹, 张晶², 张蕾涛³, 李海涛³, 樊帅奇³, 徐金富^3,4

1.长沙航空职业技术学院, 湖南长沙 410124;
2.西安科技大学材料科学与工程学院, 陕西西安 710054;
3.长安大学材料科学与工程学院, 陕西西安 710061;
4.宁波工程学院材料与化学工程学院, 浙江宁波 315211

收稿日期:2021-04-16 出版日期:2021-09-25 发布日期:2021-12-09
通讯作者: 徐金富,教授,博士,E-mail:xjf7413@sina.com
作者简介:周建波(1990—),男,讲师,硕士,主要研究方向为材料加工,E-mail:465042614@qq.com。
基金资助:
宁波市2025重大专项(2019B10084),长沙航空职业技术学院院级课题(YD2002)

Effect of laser process parameters on crack rate and microstructure of Ni60/WC clad coating

Zhou Jianbo¹, Zhang Jing², Zhang Leitao³, Li Haitao³, Fan Shuaiqi³, Xu Jinfu^3,4

1. Changsha Aviation Technical College, Changsha Hunan 410124, China;
2. School of Materials Science and Engineering,Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China;
3. School of Materials Science and Engineering, Chang'an University, Xi'an Shaanxi 710061, China;
4. School of Materials Science and Chemical Engineering, Ningbo University of Technology, Ningbo Zhejiang 315211, China

Received:2021-04-16 Online:2021-09-25 Published:2021-12-09

摘要/Abstract

摘要： 采用单因素试验,依次改变激光功率(P)、扫描速度(v)、搭接率(O)和送粉量(Q),研究了各参数对Ni60/WC涂层裂纹率和组织的影响,并借助能谱仪和X射线衍射仪分析了涂层的相组成及元素分布。结果表明:Ni60/WC涂层裂纹率与P成正比,与v成反比,在合适的P、v下,O和Q对裂纹率的影响不明显;涂层与基体均能形成良好的冶金结合,各参数对晶体生长方式无明显影响,整个熔池从底部到顶部依次是平面晶区、胞状晶区、较细小枝晶区和细小等轴晶区;晶粒度主要由冷却速度ε决定,晶粒度与P成正比,与v和O成反比,但随着Q的增加,晶粒度先减小后增大;Ni60/WC涂层主要由γ-(Fe, Ni)、W₂C、Fe₃W₃C、M₇C₃、M₂₃C₆及Ni₄W等物相组成,其中WC部分以颗粒形式存在,起到第二相强化的作用,部分与熔池中的Fe、Ni等元素形成合金碳化物,在晶界上以网状析出,起到晶界强化的作用。

关键词: 激光熔覆, Ni60/WC涂层, 裂纹率, 显微组织

Abstract: Effects of laser power (P), scanning speed (v), overlap rate (O) and powder feeding rate (Q) on the crack rate and microstructure of Ni60 /WC coating were studied by single factor test. The phase composition and element distribution of the coating were analyzed by means of energy spectrometer and X-ray diffraction. The results show that the crack rate is directly proportional to the P and inversely proportional to the v. Under the appropriate P and v, the effect of both O and Q on crack rate is not obvious. Both the coating and the substrate can form a good metallurgical bond, and each parameter has no obvious influence on the crystal growth pattern. The whole molten pool is successively composed of planar crystal region, cellular crystal region, relatively fine dendrite region and fine equiaxial crystal region from bottom to top. The grain size is mainly determined by the cooling rate ε. The grain size is directly proportional to the P and inversely proportional to the v and O. However, with the increase of Q, the grain size first decreases and then increases. The Ni60/WC coating is mainly composed of γ-(Fe, Ni), W₂C, Fe₃W₃C, M₇C₃, M₂₃C₆ and Ni₄W, etc, among which the WC part exists in the form of particles, playing the role of second phase strengthening, and part of WC form alloy carbide with Fe, Ni and other elements in the molten pool, in the grain boundary precipitation network, playing the role of grain boundary strengthening.

Key words: laser cladding, Ni60/WC coating, crack rate, microstructure

中图分类号:

TG174.4

周建波, 张晶, 张蕾涛, 李海涛, 樊帅奇, 徐金富. 激光工艺参数对Ni60/WC涂层裂纹率及组织的影响[J]. 金属热处理, 2021, 46(9): 252-257.

Zhou Jianbo, Zhang Jing, Zhang Leitao, Li Haitao, Fan Shuaiqi, Xu Jinfu. Effect of laser process parameters on crack rate and microstructure of Ni60/WC clad coating[J]. Heat Treatment of Metals, 2021, 46(9): 252-257.

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激光工艺参数对Ni60/WC涂层裂纹率及组织的影响

Effect of laser process parameters on crack rate and microstructure of Ni60/WC clad coating

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