Journal of South China University of Technology(Natural Science Edition) ›› 2025, Vol. 53 ›› Issue (1): 108-117.doi: 10.12141/j.issn.1000-565X.240094

• Materials Science & Technology • Previous Articles     Next Articles

Microstructure and High Temperature Deformation Resistance of Nickel-Based Coating on TC4 Surface

FU Yuming, LI Changcheng, YAN Maorong, ZHENG Lijuan   

  1. School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China
  • Received:2024-03-04 Online:2025-01-25 Published:2025-01-02
  • Contact: 郑立娟(1971—),女,博士,教授,主要从事电磁热强化及激光熔覆强化与再制造研究。 E-mail:ydzlj@ysu.edu.cn
  • About author:付宇明(1971—),男,博士,教授,主要从事激光熔覆强化与再制造、电磁热止裂技术等研究。E-mail: mec9@ysu.edu.cn
  • Supported by:
    the Natural Science Foundation of Hebei Province(E2021203218)

Abstract:

In order to study the high temperature and deformation resistance of laser cladding coating on TC4 surface, different proportions of nickel-metal-multi-ceramic composite coatings were prepared on TC4 matrix by laser cladding technology. And GH4169 nickel-based superalloy powder was taken as the base powder, HfC, ZrC, TaC and NbC transition carbides as the reinforcing phase. The microstructure, hardness and high temperature deformation resistance of coatings with different multi-component ceramic powder contents were systematically studied by microstructure characterization and performance experiments. The results show that the addition of carbide ceramic reinforcement phase refines the microstructure of the coating and improves the hardness, and the hardness is the highest when the proportion of ceramic reinforcement phase is 15%, which is 2.54 times that of the substrate. With the increase of temperature, the internal dendrites of the pure nickel-based cladding coating were dissolved and separated, and gradually isoaxed. The dendrite fragmentation appeared in the nickel-based cladding coating supplemented with 15% ceramic powder, and the ceramic strengthened phase dispersed in the cladding layer gathered and grew. Under the conditions of three temperature compression test temperatures (700, 800 and 900 ℃), the maximum equivalent stress and maximum equivalent strain of the specimen appear in the matrix, and compared with the TC4 specimen, the laser cladding specimen produces a stress abrupt change in the coating bonding zone, and the deformation resistance ability of the laser cladding specimen coating is enhanced.

Key words: TC4 titanium alloy, laser cladding, microstructure, microhardness, high temperature compression

CLC Number: