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Acta Metall Sin  2005, Vol. 41 Issue (11): 1174-1182     DOI:
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Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels
FANG Bingyan; HAN Enhou; WANG Jianqiu; KE Wei
Environmental Corrosion Center; Institute of Metal Research; The Chinese Academy of Sciences
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FANG Bingyan; HAN Enhou; WANG Jianqiu; KE Wei. Influence of strain rate on near-neutral pH environmentally assisted cracking of pipeline steels. Acta Metall Sin, 2005, 41(11): 1174-1182 .

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Abstract  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. 5×10-5 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.
Key words:  local strain rate      stress corrosion cracking      corrosion fatigue      
Received:  30 June 2005     
ZTFLH:  U177  
  TG172.9  

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I11/1174

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