Process and properties of laser cladding CoCrW coating on TC4 alloy

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

doi:10.16411/j.cnki.issn1006-7736.2023.01.013

Journal of Dalian Maritime University >

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

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

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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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

Cite this article

WANG Jia-ying , SUN Yu-bin , NIU Hao-jie , LIN Cheng-xin . Process and properties of laser cladding CoCrW coating on TC4 alloy[J]. Journal of Dalian Maritime University, 2023 , 49(1) : 117 -126 . DOI: 10.16411/j.cnki.issn1006-7736.2023.01.013

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