Porosity suppression process of laser cladding nickel-based coatings reforced with 57%WC on P550 non-magnetic steel
LI Jiajia1, LIU Lilan1, WANG Jiayi1, WANG Shen1, HAN Feiyan2
1. School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China; 2. School of Aeronautical Manufacturing Engineering, Xi'an Aeronautical Polytechnic Institute, Xi'an 710089, China
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.
李佳佳, 刘丽兰, 王甲一, 汪甡, 韩飞燕. 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[J]. 粉末冶金材料科学与工程, 2025, 30(6): 490-501.
LI Jiajia, LIU Lilan, WANG Jiayi, WANG Shen, HAN Feiyan. Porosity suppression process of laser cladding nickel-based coatings reforced with 57%WC on P550 non-magnetic steel. Materials Science and Engineering of Powder Metallurgy, 2025, 30(6): 490-501.
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