825合金在高温超临界水中的一般腐蚀和应力腐蚀开裂行为

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

Corrosion Science Pub Date : 2025-03-29 DOI:10.1016/j.corsci.2025.112895

Hongsheng Chen , Rui Tang , Tianguo Wei , Xuesong Leng

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引用次数: 0

摘要

研究了825合金在550℃和650℃超临界水中的一般腐蚀和应力腐蚀开裂行为。结果表明，在650℃下，825合金在长时间暴露时表现出稳定的增重行为，而在550℃下，由于TiN析出物氧化引起的均匀腐蚀和点蚀的相互作用，合金的增重和减重行为交替发生。在550℃时，形成多孔的双层氧化膜，外层主要由（Cr,Fe）2O3晶粒组成，内层由点缀着多晶尖晶石氧化物的亚层基体组成。在此温度下，应力腐蚀裂纹以断口边缘区域的晶间裂纹为特征。在650℃时，氧化膜由多晶尖晶石氧化物和Cr2O3组成，更加均匀、致密和具有保护作用。在这种高温下，断裂模式转变为解理和韧性断裂的结合。

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General corrosion and stress corrosion cracking behaviors of Alloy 825 in high-temperature supercritical water

General corrosion and stress corrosion cracking behaviors of Alloy 825 were investigated in supercritical water at 550 °C and 650 °C. The results show that Alloy 825 demonstrates consistent weight gain with prolonged exposure at 650 °C, while exhibits alternating weight gain and weight loss behaviors at 550 °C due to the interplay between uniform corrosion and pitting corrosion caused by the oxidation of TiN precipitates. At 550 °C, a porous and double-layer oxide film is generated, with the outer layer primarily composed of (Cr,Fe)₂O₃ grains and the inner layer consisting of the sub-layer matrix interspersed with polycrystalline spinel oxides. Stress corrosion cracking at this temperature is characterized by intergranular cracks at the edge regions of the fracture surface. At 650 °C, the oxide film is more uniform, compact and protective, comprising polycrystalline spinel oxides and Cr₂O₃. The fracture mode at this elevated temperature transitions to a combination of cleavage and ductile fractures.

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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.