Microstructure and wear resistance of laser clad Ni/Ni-WC gradient coating on Cr12MoV steel

doi:10.13251/j.issn.0254-6051.2021.09.040

Abstract

Abstract: Ni/Ni-WC gradient coating was clad on the surface of the Cr12MoV die steel by using pulsed Nd:YAG laser, and the phase composition, wear resistance and wear morphology of the gradient coating were studied by X-ray diffractometer, scanning electron microscope and energy spectrometer, high-speed reciprocating friction and wear tester, and white light interferometer. The results show that the Ni60A+35%WC wear-resistant layer are mainly composed of γ-(Ni, Fe) solid solution, WSi₂ phase and many kinds of carbides or hard phases. There are no defects such as cracks and pores between the gradient coating layers and between the coating and the substrate, showing good metallurgical bonding at the interfaces. The average microhardness of the Ni60A+35%WC wear-resistant layer of the gradient coating is about 1.7 times that of the substrate, and the wear mechanism of the Ni/Ni-WC wear-resistant coating is mainly fatigue wear and abrasive wear, while that of the substrate is mainly adhesive wear and abrasive wear.

Key words: Cr12MoV steel, laser cladding, Ni/Ni-WC gradient coating, microstructure, wear resistance

CLC Number:

TG174.442

Li Li, Ye Hong, Liu Yue, She Hongyan, Qu Wei, Shen Dachen, Chen Li. Microstructure and wear resistance of laser clad Ni/Ni-WC gradient coating on Cr12MoV steel[J]. Heat Treatment of Metals, 2021, 46(9): 223-228.

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