Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels

IMR OpenIR

	Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels
	Fang, BY; Han, EH; Wang, JQ; Ke, W
通讯作者	Ke, W()
	2005-11-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	41 期号:11 页码:1174-1182
摘要	Environmentally 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.
关键词	local strain rate stress corrosion cracking corrosion fatigue strain assisted corrosion cracking environmentally assisted cracking
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000233702000010
出版者	SCIENCE PRESS
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/82519
专题	中国科学院金属研究所
通讯作者	Ke, W
作者单位	Chinese Acad Sci, Inst Met Res, Environm Corros Ctr, Shenyang 110016, Peoples R China
推荐引用方式 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.