Microstructure and properties of particles reinforced Co-based coating by laser cladding on 42CrMo steel

doi:10.13251/j.issn.0254-6051.2023.03.027

Abstract

Abstract: Co-based composite coating was prepared on surface of 42CrMo steel by laser technology to improve the wear resistance of mining pick, and the microstructure, hardness and wear resistance of the coating were analyzed. The results show that the clad layer has good morphology and metallurgical bonding with the substrate. Under the action of laser, WC particles dissolve and react with various elements. The clad layer is mainly composed of γ-(Co, Fe) and carbides. The microstructure of the clad layer is gradient, and the clad zone consists of equiaxed dendrites and carbide particles rich in W and Ti, while the transition zone consists of planar, dendritic and columnar grains. The average microhardness of the clad layer is 995 HV, which is much higher than that of the substrate (328 HV), and the hardness of the heat affected zone is also greatly increased. Under the same wear conditions, the friction coefficient of the clad layer is low, and the volume wear amount is only 13.5% of the substrate. In the process of friction, the dispersed fine carbide particles gradually protrude and play the role of bearing load and resisting wear, so that the clad layer has good wear resistance, and the wear mechanism is slight abrasive wear. The particle reinforced Co-based coating prepared by laser cladding technology has dense structure and excellent performance, which can significantly improve the surface hardness and wear resistance of the 42CrMo steel.

Key words: mining pick, laser cladding, composite coating, microstructure, resisting wear

CLC Number:

TG174.4

Li Erpan, Liang Guoxing, Liu Donggang, Lü Ming. Microstructure and properties of particles reinforced Co-based coating by laser cladding on 42CrMo steel[J]. Heat Treatment of Metals, 2023, 48(3): 159-165.

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