| LI Ke-yao,ZHOU Jian-song,WANG Ling-qian.Effect of B and Si Elements on the Amorphous Formation Ability and Tribological Mechanism of Fe-Cr-Mo-B-Si Amorphous Coatings by Laser Cladding[J],49(8):192-202 |
| Effect of B and Si Elements on the Amorphous Formation Ability and Tribological Mechanism of Fe-Cr-Mo-B-Si Amorphous Coatings by Laser Cladding |
| Received:January 16, 2020 Revised:August 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.08.022 |
| KeyWord:laser cladding Fe-based amorphous coating microstructure mechanical property wear resistance |
| Author | Institution |
| LI Ke-yao |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China; 2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing , China |
| ZHOU Jian-song |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| WANG Ling-qian |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
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| Abstract: |
| The work aims to explore the influence of different ratios of B and Si elements on the amorphous formation ability of Fe-based amorphous coatings, and determine the optimum ratio of B and Si. By optimizing the ratio of B and Si elements, Fe-based amorphous coatings with uniform microstructure and excellent performance were prepared by laser cladding technology. The phase composition, microstructure, mechanical properties and tribological properties of the Fe-based amorphous coating were analyzed and tested by X-ray diffraction, scanning electron microscope, energy disperse spectroscope, Vickers indenter, nano-indentor and friction testing machine. The effects of B and Si elements on the microstructure and tribological properties of Fe-based amorphous coatings were investigated. The coating had the highest amorphous content of about 47% when the content of B and Si reached 10atm% and mainly included amorphous phase, homogeneous Fe-based solid solution and FeCrMo intermetallic compounds. The thickness of the coating was about 400 μm, and the micro-Vickers hardness was up to 1400HV0.2. Under the condition of reciprocating friction, the friction coefficient of the coating was stable at 0.45, and the wear rate was 2.28×10–6 mm3/N•m. The coating showed excellent wear resistance. The small size elements of B and Si with an atomic percentage of 10% can effectively improve the amorphous formation ability of Fe-based amorphous coating by laser cladding due to preventing the formation of FeCrMo intermetallic compounds, and further improve the hardness and tribological properties of the coating. |
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