Optimization of process parameters for laser clad Ni-based coatings on gear steel surface

doi:10.13251/j.issn.0254-6051.2023.11.044

Abstract

Abstract: Ni-based coating was fabricated on the surface of 18CrNiMo7-6 gear steel by laser cladding technique, and the effects of laser power, scanning speed, and powder feeding rate on the cladding quality and microstructure of Ni-based coating were investigated. The relationship between laser cladding process parameters and the macroscopic size, microstructure and microhardness of the clad coating was established. The results show that, with the increase of laser power, the melted height, width and depth of the coating increase, the microstructure is refined, and the microhardness increases. With the increase of scanning speed, the melted height and width of the coating increase, the melted depth decreases, the microstructure is coarsened, and the microhardness decreases. With the increase of powder feeding rate, the melted height of the coating increases, the melted width increases first and then decreases, the melted depth decreases, the microstructure is refined, and the microhardness increases. Based on the macroscopic morphology, microstructure and microhardness of the clad coating, the optimal process parameters are selected as the laser power of 700 W, scanning speed of 2 mm/s, and powder feeding rate of 11.1 g/min.

Key words: laser cladding, 18CrNiMo7-6 gear steel, process parameter, microstructure, microhardness

CLC Number:

TH117.1

Shi Lubing, Du Jiajun, Zhang Zhihong, Ding Haohao, Wang Wenjian, Liu Zhongming. Optimization of process parameters for laser clad Ni-based coatings on gear steel surface[J]. Heat Treatment of Metals, 2023, 48(11): 266-275.

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