Preparation technology of laser clad Fe-based coating for shield sealing runway repair

doi:10.13251/j.issn.0254-6051.2022.01.034

Abstract

Abstract: To explore the effect of laser cladding remanufacturing on repair of the wear scar of the shield machine sealing runway, the Fe-based self-fusible alloy coating (Fe55) was prepared on 42CrMo steel substrate by powder feeding laser cladding process. Based on the L₁₆(4³) orthogonal experiment, the effects of laser power, cladding rate and over lap rate on surface morphology, cross section characteristic parameters, dilution rate, microstructure and hardness of the coating were investigated. The results of range analysis show that the dilution rate increases with the increase of laser power and cladding rate, among which the laser power has the greatest influence on coating hardness, and the maximum coating hardness is about 2.16 times of the matrix hardness. Fe-based coating can significantly reduce the friction coefficient of the matrix and has excellent wear resistance. Its wear volume is 1.09×10^-2 mm³ lower than that of the matrix. The main wear mechanism is abrasive wear and fatigue wear.

Key words: laser cladding, sealing runway, remanufactureing repair, orthogonal experiment, dilution rate, wear resistance

CLC Number:

TG178

Lu Qingliang, Wang Jing, Qi Xiaoxia, Li Yanle, Li Fangyi. Preparation technology of laser clad Fe-based coating for shield sealing runway repair[J]. Heat Treatment of Metals, 2022, 47(1): 202-211.

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