Notch sensitivity and short cracks tolerance in a super 13Cr stainless steel under sulfide stress corrosion cracking conditions

IF 2.7 4区材料科学 Q3 ELECTROCHEMISTRY

Corrosion Reviews Pub Date : 2022-11-25 DOI:10.1515/corrrev-2022-0010

R. V. Landim, J. Castro, G. Altoé, M. Meggiolaro, J. Velasco

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引用次数: 2

Abstract

Abstract Notch sensitivity under sulfide stress corrosion cracking (SSC) conditions is quantified in this work, considering its tolerance to short cracks that start at notch tips and become non-propagating after growing for a short while. The considered material is an UNS S41426 super 13Cr5Ni2Mo martensitic stainless steel, frequently used in pipelines to transport aggressive fluids in offshore applications. Tolerance to short SCC cracks depends on the notch size and shape, on the stress gradient ahead of its tip, and on basic material resistances to crack initiation SSSC and growth KISSC inside the aggressive environment. The proposed notch-sensitivity model can be a powerful and economical alternative design tool to substitute traditional pass/non-pass criteria normally used to choose materials for SSC and similar environmentally assisted cracking (EAC) service conditions. This model is validated by testing the steel into an aqueous solution of 100 g/L of Cl−, pH 4.0, 25 kPa of H2S, and 75 kPa of CO2, at 23 ± 2 °C. After measuring SSSC (461 ± 23 MPa) and KISSC (36.9 ± 0.6 MPa√m), short crack tolerance predictions are verified on notched specimens loaded under a peak stress at their tips σmax = 0.95⋅SY >> SSSC, where SY = 826 MPa is the yield strength of the tested steel.

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硫化物应力腐蚀开裂条件下超13Cr不锈钢的缺口敏感性和短裂纹容限

摘要本工作量化了硫化物应力腐蚀开裂（SSC）条件下的缺口敏感性，考虑到其对始于缺口尖端并在短时间增长后不再扩展的短裂纹的耐受性。所考虑的材料是UNS S41426超级13Cr5Ni2Mo马氏体不锈钢，经常用于海上应用中输送腐蚀性流体的管道。短SCC裂纹的公差取决于缺口尺寸和形状、尖端前方的应力梯度以及侵蚀环境中裂纹萌生SSSC和扩展KISSC的基本材料阻力。所提出的缺口敏感性模型可以成为一种强大而经济的替代设计工具，以取代通常用于选择SSC和类似环境辅助开裂（EAC）使用条件材料的传统合格/不合格标准。通过在23±2°C下将钢放入100 g/L Cl−、pH 4.0、25 kPa H2S和75 kPa CO2的水溶液中进行测试，验证了该模型。在测量SSSC（461±23 MPa）和KISSC（36.9±0.6 MPa√m）后，对缺口试样的短裂纹容限预测进行了验证，这些缺口试样在其尖端的峰值应力σmax=0.95·SY>>SSSC下加载，其中SY=826 MPa是被测钢的屈服强度。

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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来源期刊

Corrosion Reviews 工程技术-材料科学：膜

CiteScore

5.20

自引率

3.10%

发文量

审稿时长

4.5 months

期刊介绍： Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.