TC4合金表面激光熔覆CoCrW涂层工艺和性能

王佳滢; 孙毓彬; 牛豪杰; 林成新

doi:10.16411/j.cnki.issn1006-7736.2023.01.013

大连海事大学学报 >

2023 , Vol. 49 >Issue 1: 117 - 126

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2023.01.013

船舶与海洋工程

TC4合金表面激光熔覆CoCrW涂层工艺和性能

王佳滢 ,
孙毓彬 ,
牛豪杰 ,
林成新

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(大连海事大学船舶与海洋工程学院，辽宁大连 116026)

王佳滢（1998 — ），女，硕士生;林成新（1963 — ），男，博士，教授，博士生导师， E-mail：lchxin@dlmu.edu.cn

收稿日期: 2022-11-10

修回日期: 2022-12-10

网络出版日期: 2022-12-10

基金资助

大连市科技创新基金重点学科重大项目（2020JJ25CY016）；大连市科技创新基金项目（2020JJ25CY016）

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Process and properties of laser cladding CoCrW coating on TC4 alloy

WANG Jia-ying ,
SUN Yu-bin ,
NIU Hao-jie ,
LIN Cheng-xin

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(Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China)

Received date: 2022-11-10

Revised date: 2022-12-10

Online published: 2022-12-10

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摘要

为提高TC4钛合金表面耐磨性和耐腐蚀性，利用激光熔覆技术在TC4钛合金表面激光熔覆制备CoCrW涂层,并对其工艺及耐磨性和耐蚀性进行研究。结果表明:CoCrW熔覆层和TC4基体有着良好的冶金结合，熔覆涂层显微组织均匀致密，主要由树枝晶组成。在激光工艺参数中,扫描速度、离焦量、光斑直径和搭接率一致情况下，当激光功率为3000W时，所得熔覆层硬度最大为1160HV，为TC4基材硬度324HV的近4倍，且在该功率下，CoCrW熔覆层平均摩擦系数最低为0.2363，磨损量最小，表现出较好的耐磨特性，磨损机制为磨粒磨损和轻微的黏着磨损；而TC4基材的平均摩擦系数为0.3598，磨损机制为黏着磨损和疲劳剥落磨损，此时，熔覆层的电化学腐蚀电位较高，腐蚀速率较低，表现出良好的耐蚀性。

关键词： TC4钛合金; 激光熔覆; CoCrW涂层; 显微组织; 耐磨性能; 耐蚀性能

本文引用格式

王佳滢 , 孙毓彬 , 牛豪杰 , 林成新 . TC4合金表面激光熔覆CoCrW涂层工艺和性能[J]. 大连海事大学学报, 2023 , 49(1) : 117 -126 . DOI: 10.16411/j.cnki.issn1006-7736.2023.01.013

Abstract

In order to improve the surface wear resistance and corrosion resistance of TC4 titanium alloy, CoCrW coating was prepared by laser cladding technology on the surface of TC4 titanium alloy, and its process, wear resistance and corrosion resistance were studied. The results show that the CoCrW cladding layer and the TC4 matrix exhibit good metallurgical bonding, and the microstructure of the cladding coating is uniform and dense, mainly composed of dendrites crystals. For the laser power 3000 W, the maximum hardness of the cladding layer is 1160 HV, nearly 4 times harder than TC4 substrate 324 HV under the same process condition including scanning speed, defocus, spot diameter and lap rate, and at this power, the average friction coefficient is as low as 0.2363,the wear amount is minimal as good wear resistance, the wear mechanism is abrasive wear and slight adhesive wear. The average friction coefficient of TC4 substrate is 0.3598,and the wear mechanism is adhesion wear and fatigue spalling wear, in this case, the electrochemical corrosion potential of the cladding layer is higher that result a lower corrosion rate with good corrosion resistance.

Key words： TC4 alloy; laser cladding; CoCrW coating; microstructure; wear-resisting performance; corrosion-resisting performance

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