TA15表面激光熔覆镍基和钴基涂层组织和性能对比研究

doi:10.11896/cldb.19120172

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Abstract 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 209HV_0.2 and 1 072HV_0.2, respectively, which are about 3.7 times and 3.2 times the TA15 microhardness (330HV_0.2). Both coatings have significantly improved wear resis-tance, but nickel-based coatings have better wear resistance than cobalt-based coatings.

Key words： TA15 laser cladding nickel-based coating cobalt-based coating wear resistance

Published: 23 March 2021

CLC number:

TG174.4

Fund:Autonomous Region University Scientific Research Program Key Natural Science Projects (XJEDU2020I007); Natio-nal College Student Innovation Training Program Project (201910755067).

About author:: Kun Yu is a graduate student of 2017 from Xinjiang University, he is mainly engaged in laser remanufactu-ring of titanium alloy surface and research on surface modification of materials.
Wenjun Qi is a master and professor of Southwest Jiaotong University, she is mainly engaged in digital design and application in the field of material processing.

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	YU Kun
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	LI Zhiqin

Cite this article:

YU Kun,QI Wenjun,LI Zhiqin. Comparative Study on Microstructure and Properties of Laser Cladding Nickel-based and Cobalt-based Coatings on TA15 Surface[J]. Materials Reports, 2021, 35(6): 6135-6139.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19120172 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6135

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