Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding
Abstract
:1. Introduction
2. Experimental Procedures
2.1. Coatings Preparation
2.2. Microstructures Characterization
2.3. Wear Resistance Testing
3. Results and Discussion
3.1. Phase Analysis
3.2. Microstructure Analysis
3.3. Microhardness and Wear Resistance Analysis
4. Conclusions
- (1)
- The composite coatings are mainly composed of intermetallic compounds, such as αTi and Ti5Si3. With the increase in Si content, the Ti–Si intermetallic compounds in the composite coatings increase, and the grains become finer.
- (2)
- As the Si content increases, the solidification and crystallization process of the composite coatings change, showing the microstructure changes in Ti–Si from sub-eutectic to eutectic and per-eutectic, resulting in a microstructure showing a regular transformation process, such as granular, eutectic clusters, stripes, and rods, as well as blocks.
- (3)
- As the Si content increases, the microhardness of the composite coatings gradually increases, and the wear resistance shows a tendency to improve and then deteriorate, due to the intermetallic compounds, such as Ti5Si3, formed in situ in the coatings with different morphologies. The friction coefficients of the composite coatings with different Si contents were changed, due to the competition between the favorable factor of enhancement and the unfavorable factor of abrasive wear brought about by the in situ generation of the second phase at the same time. The addition of less or more Si content leads to an increase in the coating friction coefficient. The best tribological properties were obtained for the composite coating with the eutectic structure dominated by the powder feed rate of 6.88 g/min.
- (4)
- The wear mechanism of the TC4 wire coating threads was adhesive wear, and that of the Si-TC4 composite coatings was mainly abrasive wear, which was significantly influenced by the addition of Si and the presence of intermetals like Ti5Si3.
- (5)
- According to the research results of this paper, the next step of in-depth research should focus on the precise control of the chemical composition, temperature, organization, and properties of Si-TC4 composite coatings prepared by high-speed wire-powder laser cladding.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Fe | C | N | H | O | Al | V | Ti |
---|---|---|---|---|---|---|---|
≤0.30 | ≤0.10 | ≤0.05 | ≤0.015 | ≤0.20 | 5.5–6.8 | 3.5–4.5 | Bal. |
Power/W | Scanning Speed/mm∙s−1 | Wire-Feeding Speed/mm∙s−1 | Hot Wire Coefficient | Protective Gas Flow/L∙min | Spot Size/mm | Overlap Ratio/% |
---|---|---|---|---|---|---|
2000 | 30 | 20 | 1.10 | 15 | 3 | 30 |
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Men, B.; Sun, S.; Hu, C.; Zhang, Q.; Han, B. Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding. Materials 2024, 17, 1126. https://doi.org/10.3390/ma17051126
Men B, Sun S, Hu C, Zhang Q, Han B. Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding. Materials. 2024; 17(5):1126. https://doi.org/10.3390/ma17051126
Chicago/Turabian StyleMen, Boxuan, Shenzhen Sun, Chunyang Hu, Qi Zhang, and Bin Han. 2024. "Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding" Materials 17, no. 5: 1126. https://doi.org/10.3390/ma17051126