Strengthening mechanism and properties of Co–WC composite coatings deposited by plasma-transferred arc welding

Micro & nano letters

article

Qiuyue Jiang¹  Ye Tian²  Fengyuan Shu²  Hongyun Zhao²  Yiming Sun²  Wenxiong He²  Binshi Xu³ 

[1] Institute of Technology, School of Mechanical and Electrical Engineering, Changchun University of Technology;Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai;National Key Laboratory for Remanufacturing

关键词: wear resistance;    precipitation;    solid solutions;    wear resistant coatings;    tungsten compounds;    X-ray chemical analysis;    friction;    X-ray diffraction;    microhardness;    hardness testing;    scanning electron microscopy;    arc welding;    plasma arc sprayed coatings;    cobalt;    composite materials;    metallurgy;    solid solution hardening;    dispersion hardening;    strengthening mechanism;    plasma-transferred arc welding;    cobalt-based tungsten carbide wear-resistant coatings;    Q235 low carbon steel;    microhardness;    wear properties;    energy dispersive spectrometer;    Rockwell hardness tester;    friction wear equipment;    spray welding layer;    solution strengthening;    supersaturated tungsten;    dispersion strengthening;    eutectic precipitated carbide;    silicide;    WC content ranges;    metallurgical microscopy;    scanning electron microscopy;    amorphous form;    Co-WC composite coatings;    X-ray diffraction;    solid solution;    damascene shape;    star-like shape;    amorphous W-rich phase;    polygonal W-rich phase;    Co-WC;   

DOI  :  10.1049/mnl.2018.5545

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Cobalt (Co)-based tungsten carbide (WC) wear-resistant coatings with different content of WC were prepared on the surface of Q235 low carbon steel by plasma-transferred arc welding. The properties of the coatings such as strengthening mechanism, microhardness and wear properties were tested by using a metallurgical microscope, scanning electron microscope, energy dispersive spectrometer, X-ray diffraction, Rockwell hardness tester, and friction wear equipment. The results show that the main reasons for the strengthening of spray welding layer are the solution strengthening formed by α-Co with supersaturated tungsten (W) and the dispersion strengthening caused by eutectic precipitated carbide and silicide. The proportion of the solid solution of W in α-Co steadily ranges from 18.00 to 19.59%. The morphologies of rich W-phase are mainly related to the content of W. With the content of W increasing, the evolution process of the shape is the amorphous form→damascene shape→star-like shape→the polygon. Amorphous W-rich phase can be obtained when the content of WC ranges from 20 to 30%, evenly distributed W-rich phase in the shape of damascene or star can be obtained when the WC content ranges from 30 to 40%, and the polygonal W-rich phase can be obtained at the percentage of 40–50%.

【 授权许可】

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