| ZHAO Tao,WANG You-qiang,MO Jun,ZHU Yu-ling,HE Yana,LI Meng-jie.Effect of Textures and Magnetofluid Interaction on Tribological Properties of 30CrMo3A Alloy[J],51(11):196-204, 225 |
| Effect of Textures and Magnetofluid Interaction on Tribological Properties of 30CrMo3A Alloy |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.017 |
| KeyWord:30CrMo3A gear alloy the surface texture diester based magnetic fluid friction and wear coupling mechanism |
| Author | Institution |
| ZHAO Tao |
School of Mechanical and Automotive Engineering Shandong Qingdao , China |
| WANG You-qiang |
School of Mechanical and Automotive Engineering Shandong Qingdao , China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao , China |
| MO Jun |
School of Mechanical and Automotive Engineering Shandong Qingdao , China |
| ZHU Yu-ling |
School of Mechanical and Automotive Engineering Shandong Qingdao , China |
| HE Yana |
School of Mechanical and Automotive Engineering Shandong Qingdao , China |
| LI Meng-jie |
School of Mechanical and Automotive Engineering Shandong Qingdao , China |
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| Abstract: |
| The coupling effect of magnetic fluid technology and texture technology has attracted extensive attention, but in the tribology of gear materials, scholars mainly explore the single effect of texture or magnetic fluid through experimental and theoretical analysis. This work aims to investigate the tribological properties of 30CrMo3A alloy affected by the interaction between texture and magnetic fluid, and analyze the coupling mechanism.A circular microtexture pattern was formed on the surface of 30CrMo3A alloy by nanosecond laser. The diameter of the circular texture is about 466 μm, the maximum depth is about 50 μm, and the center distance is about 670 μm. The tribological properties of untextured surfaces (UT) and textured surfaces (TS) under the condition of diester based magnetic fluid (MF) and its base carrier fluid (DOS) lubrication were tested with UMT-3 friction and wear testing machine. The test frequency was 1 Hz, and the load was 10 N, 20 N, 40 N, 60 N and 100 N, respectively. LSCM was used to observe the wear scars and calculate the wear rate. SEM-EDS was used to observe and analyze the surface morphology of different wear marks, and the wear mechanism was obtained.The results showed that compared with UT-DOS, TS-DOS, UT-MF and TS-MF all showed good antifriction performance. Among them, the average friction coefficient of TS-DOS decreased by 26.2% at low speed and low load. With the increase of load, the ability of the texture to store lubricating oil and abrasive chips decreased, and its average friction coefficient increased. The frictional coefficients of UT-MF and TS-MF were basically unchanged. Under the loading of 20 N, the average frictional coefficients of UT-MF were reduced by 17.5% at most, while under different loads, the average frictional coefficients of TS-MF can be reduced by 17.5%.TS-DOS had the best anti-wear effect. There was almost no wear under low speed and low load conditions. With the increase of load, the texture was worn, and its anti-wear effect was weakened. The maximum wear rate of TS-DOS decreased by 60.6% under heavy load conditions. TS-MF had good wear resistance at low speed and low load as well as low speed and heavy load, with wear rate reduced by 58.6% and 14.2% respectively, while UT-MF only had wear resistance at low speed and low load.The wear surface of UT-DOS has serious adhesive wear, oxidation wear and abrasive wear. The texture can effectively store lubricating oil and wear debris, so as to reduce the adhesion wear and oxidation wear of the wear surface. Therefore, the wear form of TS-DOS is mainly abrasive wear, accompanied by slight adhesion wear and oxidation wear. Under the condition of magnetic fluid lubrication, the magnetic fluid can cover and transfer the wear debris, and the wear surface of UT-MF and TS-MF has almost no adhesion wear and oxidation wear. The wear form of UT-MF and TS-MF is mainly abrasive wear. In addition, Fe3O4 nanoparticles in the magnetic fluid can polish the worn surface more smoothly. However, Fe3O4 nanoparticles in the magnetic fluid with high mass fraction tend to agglomerate under high load, which will aggravate the micro-grinding effect of the magnetic fluid. |
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