Microstructure and Wear Properties of Laser-Clad NiCrBSi Coating

Abstract:

NiCrBSi coating was prepared on the surface of 45 steel by CO₂ laser. The microstructure of the clad layer was characterized by SEM、EDS and XRD. The microhardness and wear resistance of the laser clad layer was examined. The results show that laser clad layer can be achieved under technical processing parameters and that the good metallurgical bonding is formed between the coating and substrate. The coating is uniform, continuous and free of pores and cracks. The microstructure of the coating is mainly composed of g-Ni, Ni₃B, CrB and Cr₂₃C₆ particles. The microhardness of the coating (500～650HV_0.2) is distinctly higher than that of the substrate(240～250 HV_0.2). The clad layer is reinforced by particles and grain-refining, resulting in greatly increase in wear resistance comparing with 45 steel.

• Periodical: Advanced Materials Research (Volumes 291-294)
• Pages: 105-108
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.291-294.105
• Online since: July 2011
• Authors: Yong Qiang Guo, Hong Wei Zhao, Rong Lu Sun
• Keywords: Laser Cladding, Microstructure, NiCrBSi Coating, Wear Resistance

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