Microstructure and properties of laser clad multi-layer Ni-based coating on Cr12MoV steel surface

doi:10.13251/j.issn.0254-6051.2020.12.033

Abstract

Abstract: Ni20Cr and Ni60A multi-layer Ni-based alloy wear resistant coating was prepared by laser cladding on the surface of Cr12MoV die steel by pulsed Nd:YAG laser, the phases and microstructure of the coatings were analyzed by using X-ray diffractometer, scanning electron microscope, and energy spectrometer, meanwhile the hardness and wear resistance of both the coating and the substrate were analyzed by using Vickers microhardness tester, high-speed reciprocating friction and wear tester. The results show that using the Ni20Cr as the underlying layer of the multi-layer alloy coating can effectively improve the metallurgical bond between the coating and the substrate, which can greatly reduce the defects such as cracks and pores in the coating. The main phases of the coating surface are g-(Fe, Ni), FeNi₃, BNi₃, Cr₃C₂ and Ni-Cr-Fe. The structure of the coating from bottom to surface in turn is cellular dendrites, columnar dendrites, preferentially growing dendrites and equiaxed dendrites. The Ni60A coating can greatly improve the surface microhardness of Cr12MoV die steel, and the microhardness of the coating surface can reach up to 1000 HV0.2, which is about 1.6 times of the substrate. The wear resistance of the Ni60A coating is obviously better than that of the substrate, which is about 2.0 to 3.3 times higher than that of the substrate. After laser cladding of the multi-layer Ni-based alloy coating on the Cr12MoV die steel surface, hard phases such as Cr₃C₂ and Ni-Cr-Fe can be formed and effectively improve the surface hardness and wear resistance. The probability of scrapping due to friction and wear can be significantly reduced, thereby further extending the service life of the mold.

Key words: Cr12MoV steel, laser cladding, Ni-based alloy coating, microstructure, mechanical properties

CLC Number:

TG174.442

Shen Dachen, Ye Hong, Wang Yanqing, Liu Yue, Li Li, Xiao Xinyu, She Hongyan. Microstructure and properties of laser clad multi-layer Ni-based coating on Cr12MoV steel surface[J]. Heat Treatment of Metals, 2020, 45(12): 169-174.

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