Microstructure and Tribological Properties of WC-Ni Matrix Cermet Coatings Prepared by Electrospark Deposition on H13 Steel Substrate

doi:10.11900/0412.1961.2020.00360

Acta Metall Sin

2021, Vol. 57

Issue (8): 1048-1056 DOI: 10.11900/0412.1961.2020.00360

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Microstructure and Tribological Properties of WC-Ni Matrix Cermet Coatings Prepared by Electrospark Deposition on H13 Steel Substrate

WANG Wenquan, DU Ming, ZHANG Xinge(

), GENG Mingzhang

Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130022, China

Cite this article:

WANG Wenquan, DU Ming, ZHANG Xinge, GENG Mingzhang. Microstructure and Tribological Properties of WC-Ni Matrix Cermet Coatings Prepared by Electrospark Deposition on H13 Steel Substrate. Acta Metall Sin, 2021, 57(8): 1048-1056.

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Abstract

H13 steel is one of the most promising materials for molds owing to its outstanding hardenability, high toughness, and thermal cracking resistance. To reinforce the surface performance and extend service life of H13 steel, a WC-Ni matrix cermet composite coating with a Ni or Mo transition layer was prepared by electrospark deposition on an H13 steel substrate. The phase compositions, microstructure, microhardness, and tribological properties of the coating were investigated in detail. The surface of the WC-Ni coating contained accumulated sputtered deposition spots. The cross section of WC-Ni coating is composed of a coating, a transition layer, and a substrate with a clear boundary; the WC hard phases are dispersed in the coating. The Ni/WC-Ni composite coating surface is relatively smooth and flat, and its phase composition is consistent with that of the WC-Ni coating. The WC hard phases show abnormal growth at the interface. The surface of a Mo/WC-Ni composite coating exhibits microcracks and indicates the formation of a new Fe_9.7Mo_0.3 phase. Hardness values of the composite coatings are greater than that of the WC-Ni coating, and their friction coefficient and wear loss are lower than that of the H13 steel substrate and WC-Ni coating. In addition, the antiabrasive performance of the Mo/WC-Ni composite coating is better than that of the Ni/WC-Ni composite coating.

Key words: electrospark deposition WC-Ni matrix cermet coating composite coating microstructure tribological property

Received: 09 September 2020

ZTFLH:

TG174.44

Fund: Fundamental Research Funds for the Central Universities(45120031B004);Co-Construction Project of Jilin University and Jilin Province(440050316A14)

About author: ZHANG Xinge, associate professor, Tel: (0431)85094687, E-mail: zhangxinge@jlu.edu.cn

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	Wenquan WANG
	Ming DU
	Xinge ZHANG
	Mingzhang GENG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00360 OR https://www.ams.org.cn/EN/Y2021/V57/I8/1048

Fig.1 Schematic of electrospark deposition process

Fig.2 XRD spectra of WC-Ni matrix cermet coating (a), Mo/WC-Ni composite coating (b), and Ni/WC-Ni composite coating (c) prepared by electrospark deposition

Fig.3 Surface SEM images of WC-Ni matrix cermet coating (a, b), Mo/WC-Ni composite coating (c), and Ni/WC-Ni composite coating (d) prepared by electrospark deposition

Fig.4 Cross-sectional SEM image (a) and EDS line scanning results (b) of WC-Ni matrix cermet coating prepared by electrospark deposition, and particle size distribution of ceramic phase (c)

Fig.5 Cross-sectional SEM images (a, c) and EDS line scanning results (b, d) of Ni/WC-Ni composite coating (a, b) and Mo/WC-Ni composite coating (c, d) prepared by electrospark deposition

Fig.6 Microhardness distributions of WC-Ni matrix cermet coating, Mo/WC-Ni composite coating, and Ni/WC-Ni composite coating prepared by electrospark deposition

Fig.7 Friction coefficient curves of H13 steel substrate, WC-Ni matrix cermet coating, Mo/WC-Ni composite coating, and Ni/WC-Ni composite coating at room temperature under loadings of 5 and 8 N

Fig.8 Wear weight losses of H13 steel substrate, WC-Ni matrix cermet coating, Mo/WC-Ni composite coating, and Ni/WC-Ni composite coating under loadings of 5 and 8 N

Fig.9 Wear morphologies of H13 steel substrate (a), WC-Ni matrix cermet coating (b), Ni/WC-Ni composite coating (c), and Mo/WC-Ni composite coating (d)

Table 1 EDS results of the square areas marked in Fig.9

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