Early Stages of Crack Nucleation Mechanism in Fe39Mn20Co20Cr15Si5Al1 High-Entropy Alloy during Stress Corrosion Cracking Phenomenon: Pit Initiation and Growth

IF 2.4 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2024-08-11 DOI:10.3390/cryst14080719

Pranshul Varshney, Nilesh Kumar

引用次数: 0

Abstract

This study investigated the susceptible sites for pit nucleation in a transformation-induced plasticity (TRIP) Fe39Mn20Co20Cr15Si5Al1 (at.%) high-entropy alloy (HEA) in 3.5 wt.% NaCl solution. The investigation involved a constant-load stress corrosion cracking (SCC) experiment. The SCC testing was interrupted at different pre-determined time intervals to characterize the specimen surface using a scanning electron microscope (SEM), electron backscattered diffraction (EBSD), and a three-dimensional optical stereomicroscope. The EBSD results revealed pit nucleation at the susceptible γ–ε interphase and ε–ε interlath/plate boundaries. The three-dimensional profile and SEM results indicated an increase in pit depth with no change in pit diameter on the surface of the specimen as the experiment progressed over time. This study highlights the importance of microstructural features and mechanical loading in the corrosion behavior of TRIP HEAs, providing insights into the mechanisms of pit nucleation and growth under aggressive environmental conditions.

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应力腐蚀开裂现象中 Fe39Mn20Co20Cr15Si5Al1 高熵合金裂纹成核机制的早期阶段：凹坑萌发和生长

本研究调查了在 3.5 wt.% NaCl 溶液中的转化诱导塑性（TRIP）Fe39Mn20Co20Cr15Si5Al1 (at.%)高熵合金（HEA）的凹坑成核易感部位。研究涉及恒定载荷应力腐蚀开裂（SCC）实验。在不同的预定时间间隔内中断 SCC 测试，使用扫描电子显微镜 (SEM)、电子反向散射衍射 (EBSD) 和三维光学立体显微镜对试样表面进行表征。EBSD 结果表明，在易受影响的 γ-ε 相间和 ε-ε 层间/板间边界存在凹坑成核现象。三维剖面图和扫描电镜结果表明，随着实验时间的推移，试样表面的凹坑深度增加，但凹坑直径没有变化。这项研究强调了微观结构特征和机械负载在 TRIP HEA 腐蚀行为中的重要性，为深入了解侵蚀性环境条件下凹坑成核和生长的机理提供了依据。

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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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.