Optimizing HVOF-sprayed inconel 718 coatings via direct single-aging treatment: Influence of aging temperature on microstructure, mechanical and tribological properties

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-05-11 DOI:10.1016/j.surfcoat.2025.132263

Shuhan Yang , Dingyong He , Fengxiao Ma , Li Cui , Lixia Ma , Qing Cao , Fanhui Bu , Yi Xu , Jinman Yu

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引用次数: 0

Abstract

The enhancement of the hardness and tribological properties of ball valve surface coatings is imperative for stability and reliability of reusable engines. In this study, Inconel 718 coatings were deposited on SUS 304 substrates using high-velocity oxygen fuel (HVOF) spraying. The effects of direct single aging treatments on the microstructure, mechanical and tribological properties of the HVOF-sprayed Inconel 718 coatings were systematically investigated, revealing the intrinsic relationships between aging temperature, microstructural evolution and performance. The results indicate that the porosity, grain size, oxidation degree and residual compressive stress levels of the coatings subjected to direct single aging treatments (SA600–720) increase with temperature, while the dislocation strengthening effect exhibits a negative correlation with it. Within the range of 600 °C to 660 °C, the γ’ phase is identified as the primary precipitate, undergoing significant coarsening and redissolution between 640 °C and 660 °C. From 680 °C to 720 °C, the γ” phase becomes the dominant precipitate, with its quantity and size increasing markedly with the aging temperature. The mechanical and tribological properties of the SA700 coating are optimized due to the synergistic effects of dislocation strengthening, precipitation strengthening, and residual compressive stress. Specifically, it achieves a microhardness of 694.9 HV_0.1, representing an increase of 25.4 % and 29.2 % over the coatings of as-sprayed (ASC) and solution with double aging treatments (SDA). Moreover, the average friction coefficient, wear mass and wear volume of the SA700 coating are reduced to 0.4125 μ, 0.54 mg, and 0.0066 mm³, respectively, representing decreases of 17.2 %, 45.7 %, and 47.6 % compared to the ASC coating. This study demonstrates that direct single aging treatments effectively enhance the mechanical and tribological properties of HVOF-sprayed Inconel 718 coatings.

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通过直接单次时效处理优化hvof喷涂inconel 718涂层：时效温度对微观组织、力学和摩擦学性能的影响

提高球阀表面涂层的硬度和摩擦学性能对可重复使用发动机的稳定性和可靠性至关重要。在这项研究中，采用高速氧燃料（HVOF）喷涂技术在sus304衬底上沉积了Inconel 718涂层。系统研究了直接单次时效处理对hvof喷涂Inconel 718涂层组织、力学性能和摩擦学性能的影响，揭示了时效温度、组织演变与涂层性能之间的内在关系。结果表明：直接单次时效处理（sa600 ~ 720）涂层的孔隙率、晶粒尺寸、氧化程度和残余压应力水平随温度升高而升高，位错强化效果与温度升高呈负相关；在600 ~ 660℃范围内，γ′相为初生析出相，在640 ~ 660℃之间发生了明显的粗化和再溶。从680℃到720℃，γ”相成为主要析出相，随着时效温度的升高，γ”相的数量和尺寸显著增大。由于位错强化、沉淀强化和残余压应力的协同作用，优化了SA700涂层的机械性能和摩擦学性能。显微硬度达到694.9 HV0.1，比喷涂态（ASC）和双时效态（SDA）分别提高了25.4%和29.2%。与ASC涂层相比，SA700涂层的平均摩擦系数、磨损质量和磨损体积分别降低到0.4125 μ、0.54 mg和0.0066 mm3，分别降低了17.2%、45.7%和47.6%。研究表明，直接单次时效处理能有效提高hvof喷涂Inconel 718涂层的力学性能和摩擦学性能。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.