| YANG Jiu-zhou,LI Li,ZHANG Min,ZHOU Shao-lan,ZHAN Qing-qing,HUANG An-wei,YANG Li-jie,CHEN Han-bin,LI Zhong-sheng.Effects of Ion Nitriding on Tribological Performance of CrN Coating by Multi-arc Ion Plating[J],51(11):262-270 |
| Effects of Ion Nitriding on Tribological Performance of CrN Coating by Multi-arc Ion Plating |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.024 |
| KeyWord:ion nitriding multi-arc ion plating CrN coating frictional wear nitriding and deposition hardness gradient |
| Author | Institution |
| YANG Jiu-zhou |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LI Li |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| ZHANG Min |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| ZHOU Shao-lan |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| ZHAN Qing-qing |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| HUANG An-wei |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| YANG Li-jie |
Yucai Middle School, Chongqing , China |
| CHEN Han-bin |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LI Zhong-sheng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| The work aims to improve the wear resistance of the CrN coating on 40Cr steel substrate under high load conditions through substrate strengthen with ion nitriding. In this paper, the 40Cr steel substrate was first strengthened with ion nitriding, then CrN coating was deposited on the reinforced substrate by multi-arc ions plating. The metallographic microscope and scanning electron microscope were used to analyze the microstructure of the substrate and coating. The combined strength of the coating and the substrate was tested by scratch test. The hardness of the coating and the substrate was tested with a Vickers hardness meter. The effect of base reinforcement on wear resistance of coating was studied by large load friction wear test and Vickers hardness characterization of different depths of the substrate. The results showed that, the surface hardness of the 40Cr steel substrate was increased from 380HV to 879HV after ion nitriding, the depth of the diffusion layer reached 0.30 mm. The surface hardness of the multi-arc ion-plated CrN coating was 2 380HV, the thickness was 33 μm, and the coating binding force was 37.79 N. The average friction coefficient of 40Cr steel substrate was 0.92, the wear was 43.1 mg, and the width and depth of the abrasive marks were 1 805 μm and 224 μm respectively. After ion nitriding, the average friction coefficient of the 40Cr steel substrate after ion nitriding was 0.68, and the wear was 28.4 mg, the wear width and depth were 1 260 μm and 156 μm respectively. After multi-arc ion-plating on the original substrate, the average friction coefficient of the unfortified substrate surface CrN coating was 0.55, the wear was 19.4 mg, and the wear width and depth were 884 μm and 89 μm respectively. In the friction and wear samples, the content of lumps in the transition zone was close to that on the coating surface. It was speculated that the lumps in the transition zone were coating residues, and the bottom of the transition zone was mainly base and a small amount of coating residues. At the bottom of the wear area, the coating has crossed the coating to the substrate. The cracks of the whole coating in the crushing area were sharp and there was no ductile crimping, indicating that the CRN coating of this sample had brittle fracture. It showed that CrN coating did not play a good role in resisting wear. On the reinforced substrate, the average friction coefficient of the CrN coating was 0.42, the wear was 2.6 mg, and the wear width and depth were 328 μm and 16 μm, respectively. In this sample, the CrN coating showed good wear resistance because the base had sufficient strength to support the CRN coating. It showed that the base had an indirect effect on improving the wear resistance of the coating. It is concluded that the substrate, nitriding layer and CrN coating form a hardness gradient, which improves the wear resistance of the multi-arc ion plating CrN coating and avoids the failure of the coating peeling caused by the large load friction. |
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