杜娟,孙涛,朱凯,樊小强,朱旻昊.二硫化钼薄膜增强超高强度不锈钢摩擦学及疲劳性能研究[J].表面技术,2024,53(15):45-56.
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].Surface Technology,2024,53(15):45-56 |
| 二硫化钼薄膜增强超高强度不锈钢摩擦学及疲劳性能研究 |
| Tribological and Fatigue Properties of Molybdenum Disulfide Film Reinforced Ultra-high Strength Stainless Steel |
| 投稿时间：2024-05-20 修订日期：2024-07-30 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.15.004 |
| 中文关键词: 二硫化钼薄膜 USS122G不锈钢 润滑脂 摩擦学性能 |
| 英文关键词:MoS2 film USS122G stainless steel grease tribological property |
| 基金项目:国家自然科学基金(52075458，U2141211) |
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| Author | Institution |
| DU Juan | AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu 610073, China |
| SUN Tao | AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu 610073, China |
| ZHU Kai | AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu 610073, China |
| FAN Xiaoqiang | School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| ZHU Minhao | School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| 中文摘要: |
| 目的 通过表面处理技术提高USS122G不锈钢摩擦学性能及力学性能。方法 采用闭合场非平衡磁控溅射技术在USS122G不锈钢表面沉积MoS2薄膜，分别测试了镀MoS2薄膜的USS122G不锈钢力学性能、抗腐蚀性能、弯曲性能、低周疲劳性能及滚动接触疲劳性能，探索了在干摩擦与石墨烯润滑脂条件下的摩擦学性能，并通过扫描电镜与XRD对MoS2薄膜进行形貌与成分分析。结果 成功在USS122G不锈钢表面沉积了MoS2薄膜，镀MoS2薄膜的USS122G不锈钢的纳米硬度为6.8 GPa。镀膜后的USS122G不锈钢的阻抗模量为1.06×105 Ω.cm2，腐蚀电流密度为1.91×10‒6 A/cm2。镀MoS2薄膜的USS122G镀层脱落的最大弯曲力约为3 695 N。在滚动接触疲劳测试中，镀MoS2试样较未镀膜的USS122G钢的磨痕深度更浅、宽度更窄。MoS2薄膜能有效提升USS122G不锈钢基底的减摩与耐磨性，在干摩擦条件下，与未镀膜的USS122G不锈钢相比，镀MoS2薄膜的USS122G不锈钢的摩擦因数从0.8降低至0.06~0.07，磨损率从1.68×10‒5 mm3/(N.m)减少到9.41×10‒8 mm3/(N.m)。在脂润滑条件下，USS122G不锈钢的摩擦因数在0.12左右，镀MoS2薄膜后摩擦因数一直稳定在0.103左右。结论 镀MoS2薄膜的USS122G较未镀膜的USS122G不仅提升了疲劳性能，还显著改善了摩擦学性能，提高了基底的使用寿命。 |
| 英文摘要: |
| 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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