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Metals 2015, 5(4), 1984-1996;

Microstructures and Wear Performance of PTAW Deposited Ni-Based Coatings with Spherical Tungsten Carbide

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
R & D Division of Shenyang Blower Works Group Corporation, Shenyang 110869, China
Department of Industrial Engineering, Texas Tech University, Lubbock, TX 79409-3061, USA
Author to whom correspondence should be addressed.
Academic Editor: Johan Moverare
Received: 26 August 2015 / Revised: 26 September 2015 / Accepted: 20 October 2015 / Published: 26 October 2015
(This article belongs to the Special Issue Superalloys)
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The Ni-based coatings with different content of spherical tungsten carbide were deposited by plasma transfer arc welding (PTAW) method on 304 austenitic stainless steel sheets in this study. The microstructure and wear property of spherical tungsten carbide particle reinforced composite coatings were investigated by means of optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), electron probe microanalysis (EPMA) and sliding wear test. It is shown that the fraction of spherical tungsten carbides has an important influence on microstructure of Ni-based overlay. The Ni40 overlay consists of γ-Ni dendrites with interdendritic Ni-based eutectics, borides and carbides improving the wear resistance. In the case of composite coatings with different content of tungsten carbide, many new phases are observed, such as Ni2W4C and NiW. In addition, there are a large number of irregular structures in composite coatings, such as acicular structure and irregular stripe organization. The results of sliding wear test indicate that the mass loss of coatings is influenced by the content of tungsten carbide. The mass loss decreases with the increase of tungsten carbide fraction. At high load, the abrasive resistance of composite coating with 60 wt. % tungsten carbide is improved about 50-fold compared to that of Ni40 overlay. View Full-Text
Keywords: Ni-based; spherical tungsten carbide; PTAW; microstructure; wear resistance Ni-based; spherical tungsten carbide; PTAW; microstructure; wear resistance

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Deng, D.; Zhang, L.; Niu, T.; Liu, H.; Zhang, H. Microstructures and Wear Performance of PTAW Deposited Ni-Based Coatings with Spherical Tungsten Carbide. Metals 2015, 5, 1984-1996.

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