650℃/20 MPa超临界CO2中镍基合金腐蚀蠕变裂纹萌生机理

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

Corrosion Science Pub Date : 2025-09-18 DOI:10.1016/j.corsci.2025.113329

Liujie Yang , Xingyu Feng , Pengshuai Liu , En-Hou Han , Wenjun Kuang

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引用次数: 0

摘要

研究了650℃/20 MPa S-CO2环境下镍基合金腐蚀蠕变裂纹萌生机理。在锥形拉伸试样上成功地捕获了整个腐蚀蠕变裂纹萌生过程。在初始阶段，晶界支持Cr的快速扩散，这有助于形成被动氧化层并导致空位的积累。在蠕变过程中，氧化引起的空位加速了被动氧化层下晶间孔的形成。650℃时，应变逐渐向晶界集中，最终导致表面被动氧化膜破裂，导致晶间氧化。同时，由于空位的快速积累，氧化尖端以外的孔隙继续形成。孔隙形成与晶间氧化的相互促进，加速了晶间氧化物的生长，最终导致裂纹萌生。

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Mechanism of corrosion-creep crack initiation of nickel-base alloy in 650°C/20 MPa supercritical CO2

The mechanism of corrosion-creep crack initiation of nickel-base alloy was investigated in 650 °C/20 MPa S-CO₂ environment. The entire corrosion-creep crack initiation process is successfully captured on a tapered tensile sample. At the initial stage, grain boundary supports fast Cr diffusion that helps to form the passive oxide scale and cause the accumulation of vacancy. During creep, the oxidation-induced vacancy accelerates the formation of intergranular pore beneath the passive oxide scale. The strain gradually concentrates on grain boundary at 650 °C and eventually ruptures the surface passive oxide film, leading to intergranular oxidation. Meanwhile, pore continues to form beyond the oxidation tip due to the rapid accumulation of vacancies. The mutual promotion between pore formation and intergranular oxidation accelerates the growth of intergranular oxide and finally results in crack initiation.

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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.