| DU Juan,SUN Tao,ZHU Kai,FAN Xiaoqiang,ZHU Minhao.Tribological and Fatigue Properties of Molybdenum Disulfide Film Reinforced Ultra-high Strength Stainless Steel[J],53(15):45-56 |
| Tribological and Fatigue Properties of Molybdenum Disulfide Film Reinforced Ultra-high Strength Stainless Steel |
| Received:May 20, 2024 Revised:July 30, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.15.004 |
| KeyWord:MoS2 film USS122G stainless steel grease tribological property |
| Author | Institution |
| DU Juan |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| SUN Tao |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| ZHU Kai |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| FAN Xiaoqiang |
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , China |
| ZHU Minhao |
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| High strength stainless steel, with its excellent high strength toughness and corrosion resistance, has been widely used in many key fields such as aerospace, new energy, ocean engineering and advanced manufacturing. However, in the complex and severe practical equipment application environment, it still faces great challenges in terms of wear loss and stress tolerance. Surface treatment is an important method to improve the service performance of mechanical equipment, in which solid lubricating film is an effective mean to improve the wear resistance of metal substrates. Because MoS2 layers are connected with a weak van der Waals force, it is likely to generate slip. MoS2 thin films are a widely used solid lubricant. In practical applications, MoS2 films are often combined with grease to improve the tribological performance of the equipment. To improve the tribological and mechanical properties of USS122G stainless steel, in this paper, MoS2 thin films were deposited on the surface of USS122G stainless steel by the closed-field unbalanced magnetron sputtering technology. The mechanical properties, corrosion resistance, bending properties, low cycle fatigue properties and rolling contact fatigue properties of USS122G stainless steel coated with MoS2 thin films were respectively tested. In this experiment, a ball disc reciprocating tribometer was used to explore the tribological characteristics of USS122G stainless steel and its surface samples coated with MoS2 thin films under dry friction and graphene grease lubrication. The morphology and composition of MoS2 thin films were analyzed by SEM and XRD. The nano hardness of USS122G stainless steel coated with MoS2 films was 6.8 GPa. The electrochemical test showed that MoS2 had a good barrier performance for corrosive media. The open circuit potential of USS122G stainless steel coated with MoS2 film was about ‒0.18 V, the impedance modulus was 1.06×105 Ω.cm2, and the corrosion current density was 1.91×10‒6 A/cm2, which indicated that the sample had a weak corrosion tendency. The maximum bending force of USS122G coating falling off after MoS2 film plating was about 3 695 N, indicating that the interface binding force between the MoS2 film and the matrix was good. The low cycle strain fatigue failure principle of USS122G stainless steel coated with MoS2 film was analyzed. In rolling contact fatigue test, compared with uncoated USS122G steel, the wear depth of MoS2 coated specimen was shallower and the width was narrower. MoS2 thin film could effectively improve the friction reduction and wear resistance of USS122G stainless steel substrate. Under dry friction conditions, compared with uncoated USS122G stainless steel, the friction coefficient of USS122G stainless steel coated with MoS2 film was reduced from 0.8 to 0.06-0.07. The wear rate was reduced from 1.68×10‒5 mm3/(N.m) to 9.41×10‒8 mm3/(N.m). Under the condition of grease lubrication, the friction coefficient of USS122G stainless steel was about 0.12, and the friction coefficient was stable at about 0.103 after MoS2 film plating. In the low-cycle fatigue test, USS122G stainless steel coated with MoS2 thin film sample reached the strength limit failure under low cycle times, and the direction of the dark tissue region at the crack source of the failure fracture was different. The region with low strength first experienced quasi-cleavage fracture, then fatigue cracking, and finally fracture failure. Based on the results, compared with uncoated USS122G, USS122G coated with MoS2 films not only improves the fatigue properties, but also significantly improves the tribological properties and extends the service life of the substrate. |
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