Effect of Double-Aging Heat Treatment on Microstructure and Tribological Behaviour of Cold Sprayed IN718 Coating

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2023-08-16 DOI:10.1007/s12540-023-01507-6

Alwin Balasundaram, Aviral Bisht, M. Anantharaman, Srinivasa R. Bakshi, M. Kamaraj

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Abstract

In this work, the effect of double-aging (DA) heat treatment on the microstructure and the tribological behaviour of cold-sprayed Inconel 718 (IN718) coating was studied and compared with hot-rolled IN718. After double-aging, the dendrite structure of the as-sprayed coating was modified and secondary phases such as γʹ, γʺ, and δ phases were formed. The microhardness of the coating improved after double-aging and was higher than the double-aged IN718 due to the leftover microstrain in the coating. Sliding wear tests were carried out at room temperature (RT) and 600 °C using a ball-on-disc tribometer with alumina balls. The double-aged coating had improved wear resistance than the as-sprayed coating and the double-aged substrate at room temperature. At 600 °C, the wear rate of the hot-rolled IN718 was marginally lower than the as-sprayed coating due to the formation of a comparatively thick mechanically mixed layer (MML) reinforced with Al₂O₃ which was more protective in nature. The double-aging treatment improved the wear resistance of the coating significantly at 600 °C and its wear rate was comparable to that of the double-aged substrate. The substrate and the coating undergo a combination of abrasive and tribo-oxidative wear at RT. At 600 °C, the wear mechanism involves a combination of oxidative and abrasive modes. Raman analysis revealed that the oxide formed on the wear track consisted of NiO and Fe₃O₄ at RT, and the glaze layer formed during high-temperature wear consisted of a mixture of the NiFe_xCr_2-xO₄ spinel and Fe₃O₄.

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双时效热处理对冷喷涂IN718涂层组织和摩擦学性能的影响

在这项工作中，研究了双时效（DA）热处理对冷喷涂 Inconel 718 (IN718) 涂层微观结构和摩擦学行为的影响，并与热轧 IN718 进行了比较。经过双时效处理后，喷涂涂层的枝晶结构发生了改变，形成了γʹ、γʺ和δ等次生相。由于涂层中残留的微应变，双时效后涂层的显微硬度有所提高，并高于双时效 IN718。在室温（RT）和 600 °C条件下，使用带氧化铝球的盘上球摩擦磨损测试仪进行了滑动磨损测试。在室温下，双时效涂层的耐磨性优于喷涂涂层和双时效基底。在 600 °C 时，热轧 IN718 的磨损率略低于喷涂涂层，这是因为形成了相对较厚的机械混合层（MML），该层由 Al2O3 增强，具有更强的保护性。双时效处理显著提高了涂层在 600 °C 下的耐磨性，其磨损率与双时效基底相当。在 RT 温度下，基体和涂层经历了磨料磨损和三氧化磨损。在 600 °C时，磨损机制涉及氧化和磨蚀模式的结合。拉曼分析表明，在常温下，磨损轨道上形成的氧化物由NiO和Fe3O4组成，而在高温磨损过程中形成的釉层由NiFexCr2-xO4尖晶石和Fe3O4的混合物组成。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.