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Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels
Fang, BY; Han, EH; Wang, JQ; Ke, W
Corresponding AuthorKe, W()
2005-11-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume41Issue:11Pages:1174-1182
AbstractEnvironmentally assisted cracking (EAC) of X-70 pipeline steels in near-neutral pH environments, including the standard solution, NS4, and an actual soil solution, was investigated using constant loading tests, slow strain rate tests (SSRT) and cyclic loading tests. It was revealed that local strain rate is a key factor that builds a bridge between different tests, different samples and different cracking processes, and dominates fracture mode. Therefore, local strain rate is one of the most important parameters in the EAC of X-70 pipeline steels. Stress corrosion cracking (SCC) can occur only if the local strain rate is smaller than the upper susceptible local strain rate for SCC, i.e. 5 x 10(-5) s(-1). As for cyclic loading tests, when the local strain rate is higher than this upper local strain rate for SCC, corrosion fatigue (CF) will occur. Further more, mechanical facture will take place if the local strain rate is high enough. Meanwhile, it is shown that as far as the EAC of X-70 pipeline steels in near-neutral pH environments is concerned, the cracking is dominated by the local strain rate no matter which the mechanism is, dissolution or (and) hydrogen related process. Thus the mechanism of the near-neutral pH cracking for X-70 in-service pipelines in the field is SCC instead of CF. In addition, it is proposed that the term of near-neutral pH SCC is inappropriate, which should be replaced by near-neutral strain assisted corrosion cracking to better describe the EAC of X-70 pipeline steels that is, in fact, local-strain-rate-based environmentally cracking.
Keywordlocal strain rate stress corrosion cracking corrosion fatigue strain assisted corrosion cracking environmentally assisted cracking
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000233702000010
PublisherSCIENCE PRESS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82519
Collection中国科学院金属研究所
Corresponding AuthorKe, W
AffiliationChinese Acad Sci, Inst Met Res, Environm Corros Ctr, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Fang, BY,Han, EH,Wang, JQ,et al. Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels[J]. ACTA METALLURGICA SINICA,2005,41(11):1174-1182.
APA Fang, BY,Han, EH,Wang, JQ,&Ke, W.(2005).Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels.ACTA METALLURGICA SINICA,41(11),1174-1182.
MLA Fang, BY,et al."Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels".ACTA METALLURGICA SINICA 41.11(2005):1174-1182.
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