Influence of Hydrogen on the Failure Mechanism of Standard Duplex Stainless Steel X2CrNiMoN22-5-3 Exposed to Corrosion Fatigue

M. Wolf, A. Pfennig
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Abstract

IIn a geothermal environment, cathodic protection is employed to improve resistance against corrosion fatigue. However, during the cathodic reactions under applied potential, hydrogen is generated and assimilated, leading to a reduced lifetime expectancy of high-alloyed steels. The corrosion fatigue mechanism of a standard duplex stainless steel X2CrNiMoN22-5-3 (1.4462) specimen loaded with hydrogen was studied in a corrosion chamber specifically designed for the purpose, surrounded by the electrolyte of the Northern German Basin at 369 K. The microstructural reactions resulting in hydrogen incorporation significantly decrease the number of cycles to failure of the specimen. This reduction is attributed to hydrogen enhancing crack propagation and causing early failure, primarily due to the deterioration of the mechanical properties of the ferritic phase rather than corrosion reactions or corrosive degradation.
氢对暴露于腐蚀疲劳的标准双相不锈钢 X2CrNiMoN22-5-3 失效机理的影响
在地热环境中,采用阴极保护可提高抗腐蚀疲劳的能力。然而,在外加电位下的阴极反应过程中,会产生并同化氢,从而导致高合金钢的预期寿命缩短。在专门为此设计的腐蚀室中,在 369 K 的德国北部盆地电解液的包围下,研究了加载氢的标准双相不锈钢 X2CrNiMoN22-5-3 (1.4462) 试样的腐蚀疲劳机理。这种减少归因于氢促进了裂纹扩展并导致早期失效,这主要是由于铁素体相机械性能的恶化,而不是腐蚀反应或腐蚀降解。
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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