| WANG Chao,JIANG Fulin,YANG Fazhan,LIANG Peng.Effect of Laser Energy Density on Friction and Wear Properties of Ni60A/WC Composite Coating on 65Mn Steel Surface[J],53(11):181-192 |
| Effect of Laser Energy Density on Friction and Wear Properties of Ni60A/WC Composite Coating on 65Mn Steel Surface |
| Received:June 13, 2023 Revised:September 25, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.11.016 |
| KeyWord:rotary blade laser energy density Ni60A-WC coating microstructure phase composition hardness wear resistance |
| Author | Institution |
| WANG Chao |
School of Mechanical and Automotive Engineering,Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Shandong Qingdao , China |
| JIANG Fulin |
School of Mechanical and Automotive Engineering,Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Shandong Qingdao , China;Collaborative Innovation Center for Shandong's Main crop Production Equipment and Mechanization, Shandong Qingdao , China |
| YANG Fazhan |
School of Mechanical and Automotive Engineering,Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Shandong Qingdao , China |
| LIANG Peng |
School of Mechanical and Automotive Engineering,Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Qingdao University of Technology, Shandong Qingdao , China |
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| Abstract: |
| A rotary tiller is a commonly used device in farming work. Its main soil-engaging parts, rotary blades, mainly undergo low-stress abrasive wear when working in the soil. As the wear increases, it leads to the failure of rotary blades. Every year, each country wastes a lot of steel. In order to improve the friction and wear properties of 65Mn steel used in rotary blades, improve the service life of soil-engaging parts of agricultural machinery, extend their service time, and reduce the waste of steel. Ni60A/WC composite coatings were prepared on the surface of 65Mn steel by laser cladding technology. The Ni60A/WC composite coatings were prepared under different laser energy densities by changing the laser power to adjust the laser energy density by selecting the appropriate scanning speed, powder feeding amount, spot diameter, overlap rate, and other process parameters through pre-experiment. The macroscopic morphology, crack distribution, microstructure, phase composition, element distribution, microhardness, and friction and wear characteristics of the composite coating samples under different parameters were observed and tested. The influence law and mechanism of laser energy density on the microstructure evolution and friction and wear properties of Ni60A/WC composite coatings were studied. The results showed that when the laser energy density was low, there were convex defects in the center of each cladding layer, and there were many penetrating cracks on the surface of the cladding layer. With the increase of laser energy density, the surface of the cladding layer gradually became smooth and flat, and the cracks gradually disappeared. Microscopically, the top of the Ni60A/WC composite cladding layer mainly had cellular crystals and dendrites and was closely distributed. There were mainly dendritic crystals in the middle of the cladding layer. The bottom of the cladding layer was mainly cellular crystals and dendrites growing perpendicular to the interface, and they were uniform and dense. With the increase of laser energy density, the melting height and melting depth of the cladding layer increased significantly, the WC hard phase particles decomposed, the number of hard phases decreased significantly, and the average microhardness of the coating decreased. When the laser energy density was 120 J/mm2, the average microhardness of the cladding layer was 587.1HV1.0, which was about 1.8 times that of the substrate. At this time, the average friction coefficient of the cladding layer was 0.312, which was significantly lower than that of the substrate. The hardness and wear resistance were significantly improved, and the friction and wear mechanism was slightly abrasive wear. The rotary blade with cladding layer was prepared by laser cladding technology when the laser energy density was 120 J/mm2. The field test showed that the wear quality of the rotary blade with a cladding layer was 63% lower than that of the rotary blade without a cladding layer. The rotary blade prepared by laser cladding technology had better cost performance. The hardness and wear resistance of the Ni60A/WC cladding layer can be effectively controlled by controlling the laser energy density. This study can provide theoretical guidance for the anti-friction and wear resistance and surface strengthening modification of agricultural machinery soil-touching parts. |
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