Effects of carrier gas flow and overlap rate on morphology and stress field of laser clad coatings

doi:10.13251/j.issn.0254-6051.2024.06.012

Abstract

Abstract: 5 kW CO₂ laser was used to prepare Ni45 coating on the surface of 42CrMoA steel. The effects of carrier gas flow and overlap rate on the quality of the Ni45 clad coating were studied. Finite element method was used to study the effect of overlap rate on the temperature and stress fields of the molten coating. The gas-solid two-phase flow theory and FLUNT software were used to analyze the powder flow pattern in the powder feeding process, and study the influence of carrier gas flow on the coating morphology. The results show that the stress and cracks gradually increase with the increase of the overlap rate in the clad layer, while the coating cracks can be eliminated through a 300 ℃ isothermal annealing treatment. When the overlap rate is < 40%, the flatness of the coating is poor, but when the overlap ratio is ≥ 40%, the coating flatness is good and shows no much different. When the carrier gas flow ≤ 450 L/h, the coating surface is flat, but when the carrier gas flow > 450 L/h, the flatness of the coating begins to decrease. By studying the effects of the overlap rate and carrier gas flow, the optimal cladding process parameters are obtained:the carrier gas flow is 450 L/h, and the overlap rate is 40%.

Key words: laser cladding, carrier gas flow, overlap rate, temperature field, stress field

CLC Number:

TG174.4

Wang Jiasheng, Li Yunfeng, Shi Yan, Tang Shufeng, Jiang Guangjun, Wu Jianxin. Effects of carrier gas flow and overlap rate on morphology and stress field of laser clad coatings[J]. Heat Treatment of Metals, 2024, 49(6): 77-84.

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