激光功率对Ti6Al4V/NiCr-Cr<sub>3</sub>C<sub>2</sub>熔覆层宏微观组织及性能的影响

doi:10.11896/cldb.22100243

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Abstract Laser power is an important factor affecting the quality of the cladding coatings. In order to reveal the influence of laser power on the forming quality, microstructure, and wear resistance of Ti6Al4V/NiCr-Cr₃C₂ composite coating, multi-track overlapping TiC reinforced composite coatings were prepared on the surface of Ti6Al4V substrate by laser cladding technology with coaxial powder feeding. The surface cracks, cross-section morphology, porosity, dilution rate, geometric characteristics, and microstructure of the cladding coatings were analyzed by penetration detection, optical microscopy, X-ray diffraction, and scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS). Vickers microhardness tester and friction and wear tester were used to measure the microhardness and wear resistance of the cladding coatings. Finally, the quality of the cladding coatings was evaluated based on the influence of forming, microstructure and performance. The results showed that the laser power had a significant effect on the forming quality of the cladding coating. When the laser power was 1 100 W and 1 300 W, there were many defects such as cracks and pores on the surface of the cladding coating. With the increase of laser power, the melting height, melting width, melting depth, and dilution rate of the cladding coating were improved continuously. However, the crack rate and porosity continued to decrease. The laser power had little effect on the types of phases in the coatings, and the main phases were the reinforcement phase TiC and the matrix phase CrTi₄. When the laser power was 1 500 W and 1 700 W, the hardness of the cladding coating was high, and the wear rate was low. Considering the influence of laser power on the cladding coatings in many aspects, the optimal laser power was finally determined as 1 500 W. The cladding coating prepared under this laser power had good forming quality and excellent wear resistance.

Key words： Ti6Al4V laser cladding laser power forming quality microstructure wear resistance

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TG146

Fund:Aeronautical Science Foundation of China(2020Z049067002), Scientific Research Project of Tianjin Education Commission(2020KJ020), National Natural Science Foundation of China(51905536), and Science and Technology Program of Tianjin(21YDTPJC00430).

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	ZHANG Zhiqiang
	YANG Qian
	YU Ziming
	ZHANG Tiangang
	LU Xuecheng
	WANG Hao

Cite this article:

ZHANG Zhiqiang,YANG Qian,YU Ziming, et al. Effect of Laser Power on Macromorphology, Microstructure and Performance of Ti6Al4V/NiCr-Cr₃C₂ Cladding Coatings[J]. Materials Reports, 2024, 38(2): 22100243-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22100243 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22100243

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