Influences of the TiC composite introduction method on the microstructures and properties of Nickel-Based coatings. (December 2022)

• Record Type: Journal Article
• Authors: Zeng, Jiayi; Lian, Guofu; Chen, Changrong; Huang, Xu
• Is Part Of: Optics & laser technology. Volume 156(2022)
• Publication Date: 2022-12
• Subjects: Laser cladding -- Composite introduction method -- TiC -- Response surface methodology; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2022.108633
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: The composite introduction method of the reinforced phase was proposed. The influence of the composite introduction method on the hardness of coatings was studied. The evolution mechanism of the coating microstructure was investigated. The formation mechanism of the enhanced phase was researched. The friction and wear mechanism of coatings was discussed. Abstract: TiC-reinforced nickel-based coatings were prepared by laser cladding in the work. The influence mechanisms of different TiC introduction methods on coating properties and microstructure were explored to clarify the evolution process of different powder ratios. Firstly, the mathematical model of the powder ratio, laser power, and scanning speed on hardness was established by the response surface methodology (RSM) to investigate the effects of the powder ratio and process parameters of different introduction methods on coating performance. The results showed that hardness gradually increased as powders gradually evolved from the external addition method to the synthesis method. Hardness increased with increased laser power and decreased with the increased scanning speed. The single-factor experiment of the composite introduction method was realized by changing the powder system, which revealed the formation mechanism of the reinforced phase and the frictional wear mechanism of coatings. The microstructure of the TiC formed in situ in the coating gradually changed from block to rounds with the gradual transformation of the in situ powder system. The wear resistance of coatings was also improved, and the wear mechanism gradually changed from abrasive to adhesive wear. The research results provide a theoretical reference and basis for preparing coatings by the laser cladding composite method.