H13钢表面同质激光熔覆中WC微合金化行为及摩擦学性能研究

doi:10.11896/cldb. 22030041

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Abstract The homogeneous laser cladding layers with different tungsten carbide (WC) contents were fabricated on the H13 steel, and the microstructure characteristics and tribological properties were studied. The microstructure and the law of phase evolution were investigated by X-ray diffractometer, scanning electron microscope. The tribological property and hardness characteristics of laser cladding layers were analyzed by tribometer, laser scanning confocal microscope and microhardness tester. The effects of various WC contents on the microstructure and tribological properties of different cladding layers was investigated, and the correlation between microstructure and tribological properties was clarified. Results indicated that the homogeneous laser cladding layer achieved excellent metallurgical combination with the matrix, and the outer contour of WC particles reacted with the homogeneous powder to produce micro-alloyed reinforcement. Besides, the phase of cladding layers was transformed from primary ferrite to austenite, and formed new hard phases with network dispersed at grain boundaries, which can refine grains as well as strengthen grain-boundary. The hard phases induce “cobblestone” effect and obtain a high hardness of 1 104HV, friction coefficient lower than 0.51, the specific wear rate lower than 2.24×10^-8 mm³/(N·m). Overall, the wear resistance was 17.62 times higher than that of the matrix, which effectively improves the wear resistance of H13 steel surface.

Key words： homogeneous laser cladding microalloying reaction microstructure tribological property

Published: 25 November 2023 Online: 2023-11-21

CLC number:

TG456.7

Fund:National Natural Science Foundation of China (52101097), Shaanxi Provincial Natural Science Basic Research Project (2021JM-512, 2022CGBX-13), Xi’an Science and Technology Plan Project (21XJZZ0069, 2020KJWL01), Project of Advanced Surface Engineering and Equipment Life Extension in Xi’an University (XAWLKYTD013).

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	Articles by authors
	CHANG Gengrong
	LIU Mingxia
	MENG Yu
	GUO Yan
	Ma Dayan
	LI Shiliang
	XU Kewei

Cite this article:

CHANG Gengrong,LIU Mingxia,MENG Yu, et al. Study of WC Microalloying Behavior and Tribological Property of Homogeneous Laser Cladding Layer on H13 steel[J]. Materials Reports, 2023, 37(22): 22030041-6.

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http://www.mater-rep.com/EN/10.11896/cldb. 22030041 OR http://www.mater-rep.com/EN/Y2023/V37/I22/22030041

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