Microstructure and properties of multilayer WC-40Co coating on Ti-6Al-4V by electron beam cladding

作者：Wang, Wenqin; Zhang, Shiqi; Xiao, Sheng; Sato, Yutaka S.; Wang, De^*; Liu, Yong; Liu, Donglei^*; Hu, Qiang

来源：Materials Characterization, 2022, 183: 111585.

DOI：10.1016/j.matchar.2021.111585

• Multi-layer cladding
• Electron beam cladding
• Metal matrix composite coatings
• Wear/corrosion resistance
• Phase formation mechanism

Single, double, and triple-layer WC-40Co coatings were prepared by electron beam (EB) cladding to improve the wear resistance of Ti-6Al-4V. The microstructure, micmhardness, wear resistance, and corrosion resistance of the coatings were investigated. The results demonstrated that the three types of coatings consisted of beta (Ti, W), TiCo, (Ti, W) C1-X, (W, Ti)C1-X, and a small amount of Ti2Co. The core/shell structure of (W, Ti)C1-X/(Ti, W) C1-X was observed by TEM, and the phase interfaces were studied. The hardness and wear resistance of triple-layer coating was the highest, and its wear resistance was improved by 11.5 times that of the substrate. The wear mechanisms of the substrate, single- and double-layer coating was oxidative and abrasive wear, while the triple-layer coating exhibited abrasive wear. The corrosion resistance of the single- and double-layer coatings was better than that of the substrate; however, the triple-layer coating surface was significantly damaged owing to the cracks.

• 单位
  南昌大学; 南昌航空大学