| WU Jun,JIN Jie,ZHU Dong-dong,XU Jun-fei,ZHANG Yu-liang.Effect of TiC Content on Microstructure, Friction and Wear Properties of Inconel718 Based Ceramic Coatings Prepared by High Energy Laser Cladding[J],50(9):225-235 |
| Effect of TiC Content on Microstructure, Friction and Wear Properties of Inconel718 Based Ceramic Coatings Prepared by High Energy Laser Cladding |
| Received:December 23, 2020 Revised:March 28, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.023 |
| KeyWord:laser cladding composite coating microstructure friction and wear |
| Author | Institution |
| WU Jun |
Quzhou University, Quzhou , China;Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou , China |
| JIN Jie |
Zhejiang University of Technology, Hangzhou , China |
| ZHU Dong-dong |
Quzhou University, Quzhou , China;Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou , China |
| XU Jun-fei |
Quzhou University, Quzhou , China;Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou , China |
| ZHANG Yu-liang |
Quzhou University, Quzhou , China;Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou , China |
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| Abstract: |
| In order to solve the problem of poor wear resistance of Inconel 718 superalloy, small scale TiC reinforced Inconel718 superalloy composites were prepared to improve its hardness and wear resistance. The TiC/Inconel718-based ceramic composite coating was prepared by melting with 4000 W high energy laser beam. The phase composition, microstructure, microhardness, friction and wear properties of the composite coatings with 5wt.%, 15wt.% and 25wt.% TiC were systematically analyzed. The results show that the volume fraction of small scale TiC particles, which precipitated on the γ-(Ni, Cr, Fe) matrix, increased gradually with the increase of TiC content and the grain size of the matrix obviously decreased. A large amount of Nb and Mo elements were segregated at the grain boundary of TiC and the titanium element was replaced by niobium and molybdenum elements to form niobium and molybdenum composite carbides. Meanwhile, the microhardness of the composite coating was further improved by the precipitation of (Nb,Ti)C composite carbides and Laves phase. The microhardness of the coating increased gradually from 297HV0.2 to 408HV0.2. The friction coefficient decreased from 0.3402 to 0.2628. The wear rate decreased from35.15×10－4 g/(N.m) to 5.96×10－4 g/(N.m), the typical wear mechanism changed from severe adhesive wear to abrasive wear and oxidative wear. After high energy laser cladding, the grain size of the composite coating was refined and the microhardness was increased gradually with the increase of TiC contents. During the wear test, excellent friction reduction and wear resistance of TiC/Inconel718 ceramic composite coating were obtained. |
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