Optimizing the surface quality of electrochemical machined Ni-based single crystal superalloy via manipulation of phase and dendrite dissolution

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-10-30 DOI:10.1016/j.corsci.2024.112548

Yongxin Liu , Xiaowei Lei , Wenbo Du , Wenjing Yao , Nan Wang

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引用次数: 0

Abstract

The transpassive dissolution behaviors of Ni-based single crystal superalloy in 10 %NaCl, 10 %NaNO₃, and mixed solution are investigated by using potentiodynamic polarization, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The alloy exhibits opposite yet complementary dissolution characteristics in NaCl and NaNO₃ solutions. The different responses of γ/γ′ phases to

{Cl}^{-}

and

{NO}_{3}^{-}

contribute to the opposite dissolution behaviors of dendrites and interdendritic regions. The surface flatness is noticeably enhanced in mixed solution due to the synchronous dissolution of the γ/γ′ phases. Our work paves the way for obtaining high-quality surface in electrochemical machining of single crystal superalloys.

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通过控制相和枝晶溶解优化电化学加工镍基单晶超级合金的表面质量

利用电位极化、扫描电子显微镜、能量色散 X 射线光谱和 X 射线光电子能谱研究了镍基单晶超级合金在 10%NaCl、10%NaNO3 和混合溶液中的渗透溶解行为。合金在 NaCl 和 NaNO3 溶液中表现出相反但互补的溶解特性。γ/γ′相对 Cl- 和 NO3- 的不同反应导致了树枝状和树枝间区域相反的溶解行为。在混合溶液中，由于γ/γ′相的同步溶解，表面平整度明显提高。我们的研究为在单晶超合金的电化学加工中获得高质量的表面铺平了道路。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.