Effect of HfC Addition on Microstructure and Wear Resistance of CoCrFeNiTi Coatings Fabricated by Laser Cladding
Junbiao Zheng, Fangyan Luo, Xinnuo Li, Xuemeng Zhan, Chao Gao, Jiang Huang
TL;DR
Adding HfC to CoCrFeNiTi coatings improves wear resistance by enhancing structural uniformity and forming protective phases.
Contribution
Demonstrates that HfC addition enhances wear resistance through in situ TiC formation and structural optimization in laser-clad coatings.
Findings
CoCrFeNiTi/HfC coatings show 2.4 times higher wear resistance compared to CoCrFeNiTi coatings.
HfC addition reduces brittle Laves phase and promotes equiaxed grain structure.
Improved wear resistance is attributed to TiC strengthening and oxidation-protective film formation.
Abstract
HfC possesses high hardness, high melting point, and excellent thermal stability, and is regarded as an important wear-resistant reinforcing phase material. In this study, the laser cladding technique was employed to fabricate CoCrFeNiTi and CoCrFeNiTi/HfC composite coatings on the surface of Q235 substrate. The influence of HfC addition on the phase structure evolution, microstructure, and wear resistance of the coatings was systematically investigated. The results showed that the addition of HfC did not alter the phase structure of the coating, which remained dominated by an FCC solid solution. However, they induced the formation of an in situ TiC strengthening phase and reduced the brittle Laves phase content, thereby optimizing the coating’s toughness. At the same time, the coating transformed from columnar to equiaxed crystals, with significantly finer grains and further improved…
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Taxonomy
TopicsHigh Entropy Alloys Studies · Additive Manufacturing Materials and Processes · High-Temperature Coating Behaviors