Oxidation-assisted fatigue crack initiation and propagation mechanism in CoCrAlY-coated superalloy under high temperature

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

Corrosion Science Pub Date : 2025-08-31 DOI:10.1016/j.corsci.2025.113283

Qian Li , Jia Wei , Yuqi Xie , Yingbo Li , Junkai Liu

引用次数: 0

Abstract

The low-cycle fatigue behavior of CoCrAlY-coated superalloy was studied at 900 °C in air. The investigation focused on the influence of strain amplitude and annealing treatment on fatigue life, with particular attention to the role of oxidation in promoting crack propagation. Surface oxidation of the coating resulted in the formation of Al-depleted layer, which facilitated initiation fatigue crack initiation. At the crack tip within coating or substrate, oxidation-induced β/γ'→γ transformation accelerated crack propagation. The coating/substrate interface effectively hinders crack growth. In addition, annealing treatment softened the material and reduced the stress amplitude, which decreased crack initiation but accelerated crack growth.

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cocraly涂层高温合金氧化辅助疲劳裂纹萌生与扩展机制

研究了cocrally涂层高温合金在900℃空气中的低周疲劳行为。研究重点是应变幅值和退火处理对疲劳寿命的影响，特别关注氧化在促进裂纹扩展中的作用。涂层表面氧化形成贫铝层，有利于引发疲劳裂纹。在涂层或基体裂纹尖端，氧化诱导的β/γ′→γ相变加速了裂纹扩展。涂层/衬底界面有效地阻止了裂纹的扩展。此外，退火处理软化了材料，降低了应力幅值，减少了裂纹萌生，但加速了裂纹扩展。

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

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.