Transgranular crack growth in the pipeline steels exposed to near-neutral pH soil aqueous solutions: Discontinuous crack growth mechanism

被引：33

作者：

Egbewande, Afolabi ^{[1
]}

Chen, Weixing ^{[1
]}

Eadie, Reg ^{[1
]}

Kania, Richard ^{[2
]}

Van Boven, Greg ^{[3
]}

Worthingham, Robert ^{[2
]}

Been, Jenny ^{[2
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada

[2] TransCanada Pipelines Ltd, Calgary, AB T2P 5H1, Canada

[3] Spectra Energy Transmiss, Vancouver, BC V6E 3P3, Canada

来源：

CORROSION SCIENCE | 2014年 / 83卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Steel; Corrosion fatigue; Stress corrosion; STRESS-CORROSION CRACKING; HYDROGEN; DISSOLUTION; SCC; TIP;

D O I：

10.1016/j.corsci.2014.02.032

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This investigation enabled the identification of a discontinuous crack growth mechanism of pipeline steels in near-neutral pH environments, which was determined from experimental simulations lasting more than 4 months, using a novel experimental setup that had incorporated the synergistic effects of realistic mechanical loading and the changes of environments affected by coating disbonding and CO2 level in the system. The discontinuous crack growth occurs by repeated crack dormancy-active growth cycles. Crack.dormancy can be either mechanically or environmentally induced, while the active growth is initiated because of a combined effect of cyclic loading, stress concentration and hydrogen segregation and trapping. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：343 / 354

页数：12

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