Effect of Initial Kinetic Energy of Si3N4 Ball on Impact Wear Behavior of High-Velocity Oxygen Fuel-Sprayed WC-10Co-4Cr Coating and Medium-Carbon Steel

作者：Liu, Shaopeng; Mei, Lang; Shen, Mingxue^*; Xia, Jing; Xiao, Yelong; Zhao, Huoping; Zhang, Youliang; Hu, Qiang^*

来源：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2023, 32(16): 7285-7296.

DOI：10.1007/s11665-022-07633-3

• HVOF spraying
• impact wear
• medium-carbon steel
• WC-10Co-4Cr coating
• wear performance

In order to improve the wear resistance of medium-carbon steel, a dense WC-10Co-4Cr coating was prepared by high-velocity oxygen fuel (HVOF) spraying. The results show that the thickness of WC-10Co-4Cr coating is about 200 mu m, which is mainly composed of WC, W2C, Co, Cr and Co6W6C phases, and its hardness is about 4.4 times higher than that of medium-carbon steel. The impact wear behavior of medium-carbon steel and WC-10Co-4Cr coating under ball-on-flat contact mode was systematically studied by using Si3N4 ball as impact pair. The results show that the deposition of WC-10Co-4Cr coating can significantly reduce the plastic damage and oxidation of the worn surface, thus inhibiting the initiation, propagation and connection of microcracks, as well as the crushing and spalling of surface materials. When the initial kinetic energy reaches 1.84 mJ, the width and depth of wear trace, wear volume and wear rate of WC-10Co-4Cr coating are about 96.01, 4.51, 4.17 and 4.98% of those of medium-carbon steel, respectively. In addition, the dominant wear mechanism of medium-carbon steel is plastic deformation, fatigue wear and oxidation, while the main wear mechanism of WC-10Co-4Cr coating is delamination and slight oxidation.

• 单位
  四川大学