| SHAN Jia-lu,AIYITI Wurikaixi.Effect of Graphene Content on Microstructure and Properties of Ni Based Laser Cladding[J],51(7):420-429 |
| Effect of Graphene Content on Microstructure and Properties of Ni Based Laser Cladding |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.07.042 |
| KeyWord:laser cladding graphene Ni60 microstructure microhardness tribology properties |
| Author | Institution |
| SHAN Jia-lu |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| AIYITI Wurikaixi |
College of Mechanical Engineering, Xinjiang University, Urumqi , China |
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| Abstract: |
| The work aims to study the effect of graphene (Gr) content on the microstructure and properties of Ni based laser cladding, and therefore determine the optimal Gr content. Besides, the work analyzes the influence of the scanning direction on the friction and wear properties by conducting friction and wear tests in transverse and longitudinal directions. Graphene Ni-based composite (Gr/Ni60) coatings were prepared by preset powder method with such GrGr mass fractions as 0%, 0.3%, 0.5%, 0.8% and 1%, and therefore such aspects as phase detection, microstructure, microhardness, and friction properties were analyzed. The results showed that the addition of graphene did not transform the phase components of the Ni-based cladding, which mainly include γ-Ni, Cr7C3, and Cr23C6. With the raise of Gr content, the grain size of the composite coating decreased, that is, the grain is obviously refined, the microhardness increased gradually from 623.12HV to 828.65HV, the average friction coefficient of transverse wear decreased from 0.65 to 0.48, and the transverse wear rate decreased from 7.5×10−5mm3/(N.m) to 3.6×10−5mm3/(N.m). Meanwhile, the average friction coefficient of longitudinal wear decreased from 0.70 to 0.58 and the longitudinal wear rate decreased from 5.7×10−5 mm3/N.m to 4.5×10−5mm3/(N.m). When the Gr content was 1wt.%, the grain size of the composite coating was larger than that of 0.8wt.%, and the microhardness and tribology properties decreased slightly. When the Gr content was 0.8wt.%, the composite coating had more excellent grain structure, microhardness and tribology properties. At the same time, the transverse tribology properties were better than longitudinal tribology properties. The addition of graphene in the Ni based cladding plays a very good strengthening role, but excessive addition of graphene will reduce the micro-hardness and tribology properties of the cladding. Besides, the wear mechanism of the cladding before adding graphene is mainly abrasive wear. After adding graphene, it changes to adhesive wear and oxidative wear simultaneously accompanied by abrasive wear. |
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