Microstructure and Properties of Laser Cladding Hard Composite Coating on TC4 Surface

被引：0
|
作者：
Fu Y. [1 ]
Ma S. [1 ]
Liu S. [1 ]
Zheng L. [1 ]
机构：
[1] School of Mechanical Engineering, Yanshan University, Hebei, Qinhuangdao
来源：
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2024年 / 52卷 / 03期
关键词：
cermet coating; laser cladding; TC4 titanium alloy; transition carbide;
D O I：
10.12141/j.issn.1000-565X.230061
中图分类号：
学科分类号：
摘要：
TC4 is widely used in aerospace field due to its high specific strength, good corrosion resistance and light weight. However, its disadvantages such as large friction coefficient and poor wear resistance greatly limit its application range. In view of the shortcomings of low hardness and poor wear resistance of TC4, a 4 kW high-power Laser4000 semiconductor laser was used to prepare different proportions of steel-based metal-ceramic hard coatings on the surface of TC4 by laser cladding technology with transition family refractory carbides HfC, TaC and ZrC as re⁃ inforcing phases and H13 steel-based powder as base powder. Then, the macro morphology, microstructure, phase composition and coating element distribution of the coatings with different proportions were compared and analyzed by means of scanning electron microscopy (SEM), EDS energy spectrometer, D/max-2500/PC X-ray diffractometer (XDR) and other test methods. The hardness of the coating was tested by Qness Vickers microhardness tester and the variation law of the microhardness of the cross section of the cladding sample was analyzed. The friction and wear properties of the coatings with different material components were studied by MMU-5G end friction and wear tester. The results show that the cladding layer of the specimen forms a good metallurgical bonding with the sub⁃ strate. The microstructure of the cladding layer is mainly dendritic structure and block structure. The main phases of each cladding layer all contain TiC, and as the content of ternary ceramic powder increases, the content of MC also increases. When the carbide mixed powder is 15% (mass fraction), Hf0. 8Ta0. 2Fe2 ternary alloy phase is detected in the cladding layer. When the content of ternary ceramic powder is 10% (mass fraction), the cladding grain is the smallest, the average hardness of the coating layer is the highest, and the average hardness is about 763. 43 HV, 2. 29 times the hardness of the substrate. When the content of ternary ceramic powder is 5% (mass fraction), the coating has the best wear resistance, and the relative wear resistance is 25%. © 2024 South China University of Technology. All rights reserved.
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页码：10 / 17
页数：7
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