ISSN   1004-0595

CN  62-1095/O4

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岳迪凡, 李文生, 张婷, 翟海民, 王海鹏, 朱晓霞, 李亚明, 张春芝. 超音速火焰喷涂410不锈钢涂层组织结构及摩擦学行为研究[J]. 摩擦学学报, 2024, 44(3): 1−13. doi: 10.16078/j.tribology.2023002
引用本文: 岳迪凡, 李文生, 张婷, 翟海民, 王海鹏, 朱晓霞, 李亚明, 张春芝. 超音速火焰喷涂410不锈钢涂层组织结构及摩擦学行为研究[J]. 摩擦学学报, 2024, 44(3): 1−13. doi: 10.16078/j.tribology.2023002
YUE Difan, LI Wensheng, ZHANG Ting, ZHAI Haimin, WANG Haipeng, ZHU Xiaoxia, LI Yaming, ZHANG Chunzhi. Microstructure and Wear Behavior of HVOF 410 Stainless Steel Coating[J]. Tribology, 2024, 44 (3): 1−13. doi: 10.16078/j.tribology.2023002
Citation: YUE Difan, LI Wensheng, ZHANG Ting, ZHAI Haimin, WANG Haipeng, ZHU Xiaoxia, LI Yaming, ZHANG Chunzhi. Microstructure and Wear Behavior of HVOF 410 Stainless Steel Coating[J]. Tribology, 2024, 44 (3): 1−13. doi: 10.16078/j.tribology.2023002

超音速火焰喷涂410不锈钢涂层组织结构及摩擦学行为研究

Microstructure and Wear Behavior of HVOF 410 Stainless Steel Coating

  • 摘要: 采用超音速火焰喷涂技术制备氧燃比为4.36、4.91及5.51的410不锈钢涂层,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和显微硬度仪分析表征涂层微观组织结构及力学性能. 研究微观组织结构和粉末沉积特性对涂层在干滑动摩擦条件下磨损性能的影响. 结果表明:随着氧燃比的升高,涂层结构变得均匀致密,涂层孔隙率由0.71 %下降至0.38 %,涂层显微硬度略下降约1%. 随着氧燃比的增加,涂层磨损率从17.96×10−6 mm3/(N·m)下降至9.35×10−6 mm3/(N·m),涂层耐磨性能升高,并且稳定磨损阶段涂层主要磨损机制从分层磨损和磨料磨损转变为氧化磨损和轻微磨料磨损. 当氧燃比为5.51时,涂层具有较低的孔隙率和均匀的微观结构,涂层的分层磨损倾向更低.

     

    Abstract: Low density and excellent mechanical properties of aluminium alloy make it widely used as a lightweight structural material in automobile manufacturing, but its lack of surface protection properties as a working part, especially low surface strength, hardness and poor wear resistance, limits its application as a heavy truck and tracked vehicle wheel in harsh working conditions such as gobi beach and sand field. Therefore, it is necessary to strengthen the surface of aluminium alloys to improve their comprehensive surface properties, which is important to improve their service life and expand their applications. 410 stainless steel has been widely used in surface engineering due to its high toughness, good hardness and wear resistance, and low material cost. In this study, 410 stainless steel coatings with oxygen-fuel ratios (OF) of 4.36, 4.91, and 5.51 were prepared on 6061 aluminum alloy surface using high-velocity oxygen-fuel (HVOF) spraying. The microstructure and mechanical properties of the 410 stainless steel coatings were characterized by XRD, SEM, and microhardness analysis. The effects of microstructure and powder deposition characteristics on the dry sliding friction and wear properties of the coatings at room temperature and atmosphere were studied. The results showed that both martensitic and ferrite structures were formed in the 410 stainless steel coatings sprayed with different OFs. As the OF increased from 4.36 to 5.51, the number of unmelted and semi-melted particles in the coating decreased, the structure became homogeneous and dense, the porosity of the coating decreased from 0.71% to 0.38%, the microhardness decreased from 592 HV0.1 to 586 HV0.1, and the surface roughness in the sprayed state decreased from 11.35 μm to approximately 7.05 μm. Under the conditions of dry sliding friction between the 410 stainless steel coating and the Si3N4 ball, the coefficient of friction changed with the surface state of the 410 stainless steel coating and exhibited different wear mechanisms at different run-in stages. In the pre-run-in stage (Stage I), the fraction coefficient tended to be 0.2 and remained stable, with the main wear mechanism being micro-contact high stress sliding wear; in the second run-in stage (Stage II), the fraction coefficient rised rapidly, with the wear mechanisms being micro-cutting, brittle peeling and three-body abrasive wear; in the third run-in stage (Stage III), the fraction coefficient falled slightly and then rised to around 0.7, with the main wear mechanisms being three-body abrasive wear and delamination wear. The deposition characteristics (porosity, hardness, etc.) and microstructure of the spray coating directly influenced the frictional run-in characteristics of the coating. The decrease in porosity and hardness of the coating caused a lag in its second run-in phase, while the increase in ferrite prolonged its second and third run-in phases. As OF increased, the wear resistance of the coating increased and the wear rate of the coating decreased from 17.96×10−6 mm3/(N·m) to 9.35×10−6 mm3/(N·m). The wear rate of the coating is 89%~94% lower than the aluminium alloy substrate wear rate of 164.27×10−6 mm3/(N·m). As the OF increased, the main wear mechanism in the stable wear phase of the coating changed from delamination wear to oxidation wear. At a low OF of 4.36, the coating induced delamination due to high porosity and frictional stress cracking of unfused deposited particles, and the main wear mechanisms were delamination, oxidation and abrasive wear; at a high OF of 5.51, delamination and abrasive wear were reduced due to low porosity and a more homogeneous microstructure, and the main wear mechanisms were oxidation and slight abrasive wear.

     

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