| LI Lin-fang,HE Tian-tian,DU San-ming,YUE Yun,LIU Jian,FU Li-hua,ZHANG Xin,ZHANG Yong-zhen.Surface Microstructure and Tribological Properties of GCr15SiMn Bearing Steel under Supersonic Fine Particle Bombardment[J],52(7):425-434 |
| Surface Microstructure and Tribological Properties of GCr15SiMn Bearing Steel under Supersonic Fine Particle Bombardment |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.07.039 |
| KeyWord:supersonic fine particle bombardment GCr15SiMn bearing steel microstructure mechanical properties tribological properties |
| Author | Institution |
| LI Lin-fang |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| HE Tian-tian |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| DU San-ming |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| YUE Yun |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| LIU Jian |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| FU Li-hua |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| ZHANG Xin |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
| ZHANG Yong-zhen |
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Henan Luoyang , China |
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| Abstract: |
| Bearings are key components of modern machines. Because of the advantages such as wear resistance, corrosion resistance, and long service life, bearings are widely used in many fields such as agriculture, vehicles, and industrial equipment. When the bearing is in service under bad working conditions, the surface failure is caused by various complex alternating stresses. Bearing damage and failure frequently occur on the surface or subsurface, and the surface quality of bearing has a direct impact on the performance and service life of bearing. Surface enhancement technique improves the surface qualities of bearing materials, potentially extending the service life of bearing products. Surface nanoization is a common surface mechanical treatment process, including ultrasonic rolling surface strengthening, surface mechanical attrition treatment and supersonic fine particle bombardment as the most frequent treatment methods. The diameter of the supersonic fine particle bombardment used in supersonic fine particle bombardment is small, which effectively reduces the surface roughness of target material, and the bombardment speed is high. This encourages the creation of surface residual stress, improving the surface characteristics of the material. The work aims to strengthen the surface of GCr15SiMn bearing steel by supersonic particle bombardment and study the effects of supersonic particle bombardment on the microstructure, mechanical properties and friction and wear properties of bearing steel. The microstructure, surface roughness, microhardness and mechanical properties of GCr15SiMn bearing steel before and after strengthening were observed by 3D morphology, Transmission electron microscopy (TEM), Electron back scatter diffraction (EBSD), scanning electron microscopy (SEM), X-ray residual stress analyser (LXRD), microhardness tester and other instruments, and the tribological properties before and after strengthening were tested by UMT-2 friction and wear test machine. The surface roughness of the GCr15SiMn steel samples increased after SFPB treatment, the surface structure underwent severe plastic deformation, and formed a plastic deformation layer of about 20 μm, the lamellar structure of lamellar martensite disappeared and nanocrystalline structure appeared, and the nanocrystalline grain size was about 13 nm. The average carbide particle size reduced from 0.48 μm to 0.45 μm and the number decreased by 18% on the surface of the sample. The surface hardness of the sample was enhanced from 740HV0.05 to 996HV0.05 and the depth of hardened layer was 300 μm. The highest hardness was 1 056HV0.05 at 10 μm away from the surface, and the hardness increased by 42.7%. The sample was subject to a residual stress layer with a depth of 60 μm, and the residual stress on the sample surface was around ‒1 246 MPa. After SFPB treatment, the average friction coefficient of strengthened sample was slightly higher than the original sample, but the wear rate was significantly lower. The wear mechanisms of the original sample were abrasive, adhesive, and oxidative. Similarly, the wear mechanism of the SFPB sample is primarily abrasive, with little oxidative and adhesive wear, and the tribological properties of the sample are improved. The surface roughness of the GCr15SiMn bearing steel after supersonic fine particle bombardment increases significantly, the dislocation density increases significantly, and the surface grains are refined to the nanometer level; Residual compressive stress layer and hardened layer have been built on the surface. The residual stress introduced by strengthening and the work hardening and fine grain strengthening improve the wear resistance of the material. |
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