Quantitative investigations on stress corrosion cracking initiation and propagation behavior of 20Cr-25Ni-Nb stainless steel in supercritical carbon dioxide at 650°C

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

Corrosion Science Pub Date : 2025-10-06 DOI:10.1016/j.corsci.2025.113384

Jiamei Wang , Qiyin Zhou , Jianye Chen , Xianglong Guo , Lefu Zhang , Geng Zhang , Yanping Huang

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Abstract

This study quantitatively evaluates the stress corrosion cracking (SCC) behavior of 20Cr-25Ni-Nb austenitic stainless steel in 650°C supercritical CO₂ (s-CO₂) environments, supporting the development of advanced s-CO₂ Brayton cycle systems for nuclear reactors and high-performance fuel cladding. Results demonstrate that under constant loads, SCC initiation time decreases exponentially with increasing load, with rapid initiation occurring above 0.8 times the yield strength (YS) within 120 h. Under constant stress intensity factors (K), crack growth rate (CGR) also increases exponentially with increasing K, exceeding 20 MPa√m results in CGR above 1.0 × 10⁻⁷ mm/s. Microstructural analysis reveals that SCC initiation in a 650°C s-CO₂ environment results from pronounced preferentially intergranular oxidation (PIO) along with carburization-induced oxide amorphization that further disrupts passivation and facilitate the crack initiation. Crack propagation occurs via synergistic grain boundary (GB) weakening from creep deformation, stress-assisted GB oxidation in Cr-depleted zones, and carburization ahead of the crack tip. These findings establish quantitative design limits for 20Cr-25Ni-Nb components in s-CO₂ systems.

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20Cr-25Ni-Nb不锈钢在650℃超临界二氧化碳中应力腐蚀裂纹萌生和扩展行为的定量研究

本研究定量评估了20Cr-25Ni-Nb奥氏体不锈钢在650℃超临界CO2 （s-CO2）环境下的应力腐蚀开裂（SCC）行为，为核反应堆和高性能燃料包壳先进s-CO2布雷顿循环系统的开发提供了支持。结果表明：在恒定载荷下，SCC的起裂时间随载荷的增加呈指数递减，在120 h内，在屈服强度（YS）的0.8倍以上发生快速起裂；在恒定应力强度因子(K)下，裂纹扩展速率（CGR）也随K的增加呈指数增长，当裂纹扩展速率大于20 MPa√m时，裂纹扩展速率大于1.0 × 10−7 mm/s。微观结构分析表明，在650°C s-CO2环境下，SCC的萌生是由明显的优先晶间氧化（PIO）和渗碳诱导的氧化物非晶化引起的，这进一步破坏了钝化，促进了裂纹的萌生。裂纹扩展是通过蠕变变形引起的晶界（GB）协同弱化、cr贫区应力辅助晶界氧化以及裂纹尖端前渗碳实现的。这些发现确定了s-CO2系统中20Cr-25Ni-Nb组分的定量设计极限。

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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.