Comparative Study on Microstructure and Properties of Laser Cladding Nickel-based and Cobalt-based Coatings on TA15 Surface

被引：0
|
作者：
Yu K. [1 ]
Qi W. [1 ]
Li Z. [2 ]
机构：
[1] School of Mechanical Engineering, Xinjiang University, Urumqi
[2] Xinjiang Uygur Autonomous Region Office of Defense Science, Technology and Industry, Urumqi
来源：
Cailiao Daobao/Materials Reports | 2021年 / 35卷 / 06期
关键词：
Cobalt-based coating; Laser cladding; Nickel-based coating; TA15; Wear resistance;
D O I：
10.11896/cldb.19120172
中图分类号：
学科分类号：
摘要：
To investigate the effect of laser cladding of nickel-based and cobalt-based alloys on the friction and wear properties of the titanium alloy TA15 surface, a 2 kW fiber laser was used to prepare Ni60A-50%Cr3C2-1. 0%Y2O3 and Stellite6-5%TA15-2.5%Y2O3 composite coatings on the surface of TA15. The coating structure, phase were analyzed by SEM, EDS and XRD. The hardness of the coating was measured by a meter, and the friction and abrasion test was performed by a MMG-500 three-body abrasion tester. Both the coating and the substrate show a good metallurgical bond. Nickel-based coatings are mainly composed of γ-(Fe, Ni) phase, TiC and Cr3C2 phases, and cobalt-based coatings are mainly composed of γ-Co, TiC, Co3Ti and Cr5Si3 phases. The structure of the bonding zone of the nickle-based coating is planar crystals and columnar, the middle structure of the coating is eutectic structure between dendrites and dendrites, and the top of the coating is equiaxed. The structure of the bonding zone of the cobalt-based coating is planar crystals, columnar crystals, and bulk crystals. The middle part of the coating is rod-shaped and dendritic. The top of the coating is equiaxed. The microhardness of nickel-based and cobalt-based coatings are 1 209HV0.2 and 1 072HV0.2, respectively, which are about 3.7 times and 3.2 times the TA15 microhardness (330HV0.2). Both coatings have significantly improved wear resis-tance, but nickel-based coatings have better wear resistance than cobalt-based coatings. © 2021, Materials Review Magazine. All right reserved.
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页码：6135 / 6139
页数：4
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