搭接率对TC4表面Ni60A熔覆层组织性能的影响

doi:10.13251/j.issn.0254-6051.2021.09.041

金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 229-233.DOI: 10.13251/j.issn.0254-6051.2021.09.041

搭接率对TC4表面Ni60A熔覆层组织性能的影响

龚玉玲^1,2, 武美萍¹, 崔宸¹, 缪小进¹

1.江南大学机械工程学院, 江苏无锡 214122;
2.泰州学院船舶与机电工程学院, 江苏泰州 225300

收稿日期:2021-03-29 出版日期:2021-09-25 发布日期:2021-12-09
通讯作者: 武美萍,教授,博士,博士生导师,E-mail:wmp116699@163.com
作者简介:龚玉玲(1978—),女,副教授,博士研究生,主要研究方向为激光熔覆增材制造,E-mail:79043638@qq.com。

Effect of overlap rate on microstructure and properties of Ni60A clad coating on TC4 titanium alloy

Gong Yuling^1,2, Wu Meiping¹, Cui Chen¹, Miao Xiaojin¹

1. School of Mechanical Engineering, Jiangnan University, Wuxi Jiangsu 214122, China;
2. School of Shipping and Mechatronic Engineering, Taizhou University, Taizhou Jiangsu 225300, China

Received:2021-03-29 Online:2021-09-25 Published:2021-12-09

摘要/Abstract

摘要： 利用激光熔覆同轴送粉技术,在TC4钛合金表面制备了多道搭接的Ni60A激光熔覆层。利用SEM、硬度测试及摩擦磨损试验,对多道搭接率(30%、40%、50%、60%和70%)下熔覆层的组织性能进行了分析。结果表明:搭接率对Ni60A熔覆层的组织性能影响较大,搭接可实现涂层的二次加热,当搭接率为50%时,涂层中硬质相TiC的尺寸增大,TiNi的含量增多,可有效提升涂层的硬度,抵抗对磨小球剪切力,其表面不易被破坏,涂层的表面较为光滑,可极大程度降低涂层的摩擦因数。当搭接率为30%时,晶粒无法充分吸收激光能量,导致晶粒尺寸较小;当搭接率过高时,涂层中的B、C、Ni等元素会随着过烧而稀释,导致涂层的增强元素流失,降低了涂层的力学性能,因此,Ni60A熔覆层最适宜的搭接率为50%。

关键词: 激光熔覆, Ni60A熔覆层, 搭接率, 微观形貌, 耐磨性, 硬度

Abstract: Multi-pass Ni60A laser clad coating was prepared on the surface of TC4 titanium alloy by using laser cladding coaxial powder feeding technology. The microstructure and properties of the clad coating with overlap rates (30%, 40%, 50%, 60% and 70%) were analyzed by using SEM, hardness test, and friction and wear test. The results show that the overlap rate has a greater impact on the microstructure and properties of the clad coating, which can realize the secondary heating of the coating. When the overlap rate is 50%, the size of hard phase TiC and the content of TiNi in the coating increase, which can effectively improve the hardness of the coating, resist the shear force on the grinding ball, so that the surface is not easy to be damaged, and the surface of the coating is smooth, which can greatly reduce the friction coefficient. When the overlap rate is 30%, the grains can't fully absorb the laser energy, resulting in smaller grain size. But when the overlap rate is too high, the B, C, Ni and other elements in the coating will be diluted with the over burning, resulting in the loss of reinforcing elements in the coating and reducing the mechanical properties of the coating. Therefore, the most suitable overlap rate of the Ni60A coating is 50%.

Key words: laser cladding, Ni60A clad coating, overlap rate, microstructure, wear resistance, hardness

中图分类号:

TG174.4

龚玉玲, 武美萍, 崔宸, 缪小进. 搭接率对TC4表面Ni60A熔覆层组织性能的影响[J]. 金属热处理, 2021, 46(9): 229-233.

Gong Yuling, Wu Meiping, Cui Chen, Miao Xiaojin. Effect of overlap rate on microstructure and properties of Ni60A clad coating on TC4 titanium alloy[J]. Heat Treatment of Metals, 2021, 46(9): 229-233.

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搭接率对TC4表面Ni60A熔覆层组织性能的影响

Effect of overlap rate on microstructure and properties of Ni60A clad coating on TC4 titanium alloy

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