Effect of Heat Treatment on Mechanical Properties and Corrosion Response of HVOF Sprayed High Entropy Alloy Coatings

N. Abhijith, Deepak Kumar, Karun Rawat
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Abstract

Surface and sub-surface related degradation of steels can be minimized using suitable surface coatings. High entropy alloys (HEA) are prominent and emerging materials among many coating materials. The current study investigates the effect of heat treatment of HEA coating on mechanical, metallurgical, and corrosion properties. The HEA coatings on SS304 steel were deposited using a High-Velocity Oxy-Fuel (HVOF) thermal spray process. The developed coatings were furnace heat treated at 700 °C, 900 °C, and 1100 °C, respectively, and their performance was benchmarked with the as-sprayed coatings. The metallurgical, mechanical, and microstructural analyses were performed using X-ray diffraction (XRD), Nanoindentation, Scratch test, and Field Emission Scanning Electron Microscope (FESEM) techniques. The corrosion response of the as sprayed and heat-treated coatings were recorded using a Potentiostat. The results indicated that as-sprayed coatings consisted of a single-phase BCC solid solution; however, the single-phase changed to a dual dual-phase system after heat treatment (BCC+FCC). The 900 °C heat-treated HEA coating exhibited superior mechanical and corrosion properties. But those characteristics started diminishing when the heat treatment temperature exceeded 900 °C. The introduction of the new FCC phase softened the coating, thereby leading to the evolution of microcracks in the coating. These micro-cracks acted as channels for electrolyte diffusion and further corroded the coatings. The current study surmised that HVOF-sprayed HEA coating should not be heat treated at above 900 °C.
热处理对 HVOF 喷射高熵合金涂层机械性能和腐蚀反应的影响
使用合适的表面涂层可以最大限度地减少钢材的表面和次表面降解。在众多涂层材料中,高熵合金(HEA)是一种突出的新兴材料。本研究调查了 HEA 涂层热处理对机械、冶金和腐蚀特性的影响。SS304 钢上的 HEA 涂层采用高速氧燃料(HVOF)热喷涂工艺沉积。开发出的涂层分别在 700 ℃、900 ℃ 和 1100 ℃ 下进行了熔炉热处理,并将其性能与原喷涂涂层进行了对比。使用 X 射线衍射 (XRD)、纳米压痕、划痕测试和场发射扫描电子显微镜 (FESEM) 技术进行了冶金、机械和微观结构分析。使用恒电位仪记录了喷涂和热处理涂层的腐蚀反应。结果表明,喷涂后的涂层由单相 BCC 固溶体组成;但在热处理后,单相变成了双双相体系(BCC+FCC)。经过 900 °C 热处理的 HEA 涂层具有优异的机械性能和腐蚀性能。但当热处理温度超过 900 ℃ 时,这些特性开始减弱。新的 FCC 相的引入软化了涂层,从而导致涂层中出现微裂纹。这些微裂缝成为电解质扩散的通道,并进一步腐蚀涂层。本次研究推测,HVOF 喷射的 HEA 涂层不应在 900 °C 以上的温度下进行热处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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