P550无磁钢表面激光熔覆57%WC增强镍基涂层的气孔抑制工艺

doi:10.19976/j.cnki.43-1448/TF.2025063

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Abstract In response to the technical challenge of high porosity in the laser cladding of high WC content non-magnetic nickel-based alloy powder on P550 non-magnetic steel surface, the response surface methodology and single factor method were used to design experiments. The influences of laser cladding process parameters on porosity were analyzed and the main effect factor was researched. Taking the laser power, scanning speed, powder feed rate, and overlap ratio as inputs and the porosity as the response target, a multivariate regression prediction model was established to optimize the process parameters. The results show that the coating porosity can be reduced to 0.22% when laser power is 1 015 W, scanning speed is 5.1 mm/s, powder feed rate is 0.6 r/min, and overlap ratio is 40%, meeting the requirement of engineering application. The microstructure of the coating is uniform, which is mainly composed of cellular crystal, dendritic crystal, and secondary dendritic crystal. The microhardness of the coating is about 1.6 times than that of the matrix, and the wear rate is reduced to 1.5% of the substrate. The research results can provide a process solution for laser cladding low porosity and high wear-resistance coating for the surface strengthening of non-magnetic drilling tools, and promote the engineering application of this technology in the field of petroleum drilling.

Key words： laser cladding porosity non-magnetic drilling tool process optimization wear rate

Received: 27 July 2025 Published: 06 January 2026

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	LI Jiajia
	LIU Lilan
	WANG Jiayi
	WANG Shen
	HAN Feiyan

Cite this article:

LI Jiajia,LIU Lilan,WANG Jiayi, et al. Porosity suppression process of laser cladding nickel-based coatings reforced with 57%WC on P550 non-magnetic steel[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(6): 490-501.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025063 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I6/490

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