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

Metals

Dewei Deng³  Lin Zhang¹  Tingting Niu³  Haiying Liu³  Hongchao Zhang² 

[1] R & D Division of Shenyang Blower Works Group Corporation, Shenyang 110869, China; E-Mail:;Department of Industrial Engineering, Texas Tech University, Lubbock, TX 79409-3061, USA; E-Mail:;School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China; E-Mails:

关键词: Ni-based;    spherical tungsten carbide;    PTAW;    microstructure;    wear resistance;   

DOI  :  10.3390/met5041984

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.