| XIA Jinqi,YAN Long,ZHAN Hua,WANG Ruijun,LI Shanjun,HUANG Yongjun,MENG Liang,MA Wenhao,LI Yujia,WAN Qiang.#$NPFriction and Wear Properties of Iron-based Coating on Surface of Rotary Blade[J],54(7):86-97 |
| #$NPFriction and Wear Properties of Iron-based Coating on Surface of Rotary Blade |
| Received:June 25, 2024 Revised:November 25, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.07.007 |
| KeyWord:rotary blade plasma surfacing iron-based wear resistant coating microhardness frictional wear |
| Author | Institution |
| XIA Jinqi |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
| YAN Long |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
| ZHAN Hua |
Chinese Academy of Agricultural Mechanization Sciences Group Co., Ltd., Beijing , China;National Key Laboratory of Agricultural Equipment Technology, Beijing , China |
| WANG Ruijun |
Chinese Academy of Agricultural Mechanization Sciences Group Co., Ltd., Beijing , China;National Key Laboratory of Agricultural Equipment Technology, Beijing , China |
| LI Shanjun |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
| HUANG Yongjun |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
| MENG Liang |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
| MA Wenhao |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
| LI Yujia |
Ningbo Intelligent Machine Tool Research Institute Co., Ltd.of China National Machinery Institute Group, Zhejiang Ningbo , China |
| WAN Qiang |
College of Engineering, Huazhong Agricultural University, Wuhan , China |
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| Abstract: |
| The rotary blades are worn by sand and soil during operation, which seriously affects the farming effect and the life of blades. Surface wear-resistant coating is one of the effective means to improve the wear-resistant performance of the rotary blades. Based on the wear resistance test, optimizing the wear resistant coating is the key to its application. This article studied the wear resistance of five kinds of iron-based coatings (marked as 1#-5#), and optimized the best wear resistance coating for abrasive wear experiments and field wear tests. Plasma surfacing was used to prepare coatings with five different compositions on the polished 65Mn surface. The samples were cut into 57 mm×25.5 mm×6 mm rectangles, their surfaces were polished and cleaned with ultrasonic cleaning instrument. The surface morphology and structure of the coatings were analyzed by Ultima Ⅳtype X-ray diffraction (XRD) and scanning electron microscope (SEM). HV-1000B Vickers hardness tester and nanoindentation tester were employed to analyze the hardness and mechanical properties of the coatings. RTEC M500 friction and wear test platform was used to test the friction coefficient curve of the coatings under the conditions with concentrated force load of 15 N, wear stroke of 7 mm, reciprocating frequency of 5 Hz and sliding dry friction. According to the above experimental results, the coatings were optimized with good comprehensive performance to test its wear resistance by abrasive wear experiment. Abrasive wear tests were carried out by the MLS-225 rubber wheel wet sand wear testing machine, and the wear morphology of the samples was observed by ultra-depth of field three-dimensional microscopy. Field wear experiments were carried out in a sand and gravel field and a rice stubble field respectively. The sand and gravel field was about 2 acres, and the rice stubble field was about 60 acres. The results showed that the coatings were mainly composed of matrix martensite and hard carbides such as M7C3, Cr7C3 and VC, the carbide eutectic strengthened coating (mass fraction, 2% C, 0.9% Si, 0.7% Mn, 5% Cr, 6% V, 0.74% Mo, 0.4% Ni, 84.26% Fe) had the highest hardness, reached 1 157.12HV, with the lowest friction coefficient of 0.49 and good resistance to deformation (E=239.5 GPa); The fine carbide dispersion strengthened coating was (mass fraction, 0.18% C, 1.05% Si, 0.21% Mn, 16.55% Cr, 2.12% Ni, 0.042% Al, 79.85% Fe) with the hardness of 904.72HV had the best elastic recovery ability (We=37.0%), the corresponding friction coefficient was 0.52. The abrasive wear test showed that the furrow on the wear surface of 65Mn sample was obvious, while the surface of the carbide eutectic strengthened coating and the fine carbide dispersion strengthened coating were relatively flat, showing partial spalling pit. Therefore, the average wear of the carbide eutectic strengthened coating and the fine carbide dispersion strengthened coating decreased by 93.9% and 86.9% compared with the 65Mn, respectively. In further field wear tests, the wear of the carbide eutectic strengthened and fine carbide dispersion strengthened rotary blades decreased by 51.7% and 43.6% respectively under sand and gravel conditions. Under the condition of rice stubble, the wear of the carbide eutectic strengthened and fine carbide dispersion strengthened rotary blades decreased by 64.1% and 47.6%, respectively. The final results indicated that the carbide eutectic structure reinforced coating had more excellent wear resistance, which could effectively prolong the working life of rotary blades. |
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