由奥氏体化引起的铁素体不锈钢过早分离氧化

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

Corrosion Science Pub Date : 2025-08-13 DOI:10.1016/j.corsci.2025.113260

Anton Chyrkin, Jan Froitzheim

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引用次数: 0

摘要

薄箔（0.2-0.3 毫米厚）市上可用的铁素体不锈钢Crofer 22 APU和Crofer 22 H已在900,950,1000和1050°C的空气中氧化高达2000 H。尽管在氧化物-金属界面上残余Cr含量为18-20 wt%，但两种钢种都出现了过早分离氧化。与Crofer 22 H相比，Crofer 22 APU更容易发生分离氧化。经典寿命预测工具系统地高估了分离时间。在900°C以上，由于奥氏体化（Fe-Cr体系中的α-to-γ转变）发生在箔的缺cr角和边缘，导致过早分离氧化。提出并验证了考虑奥氏体化和几何约束的寿命模型。

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Premature breakaway oxidation of ferritic stainless steels triggered by austenitization

Thin foils (0.2–0.3 mm thick) of commercially available ferritic stainless steels Crofer 22 APU and Crofer 22 H have been oxidized in air for up to 2000 h at 900, 950, 1000, and 1050 °C. Both steel grades suffered from premature breakaway oxidation, despite the remnant Cr content in the foils being 18–20 wt% at the oxide-metal interface. Crofer 22 APU was found to be more susceptible to breakaway oxidation compared to Crofer 22 H. The classical lifetime prediction tools systematically overestimated the time to breakaway. Premature breakaway oxidation above 900 °C is demonstrated to be triggered by austenitization (the α-to-γ transformation in the Fe-Cr system) occurring in the Cr-depleted corners and edges of the foils. A novel lifetime model accounting for austenitization and geometrical constraints was introduced and validated.

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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.