Effect of hydrogen-induced plasticity on the stress corrosion cracking of X70 pipeline steel in simulated soil environments

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:658

Article

Liu, Z. Y.^1,2  Wang, X. Z.¹  Du, C. W.^1,2  Li, J. K.^1,2  Li, X. G.^1,2,3 

[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Beijing 100083, Peoples R China

[2] Minist Educ, Key Lab Corros & Protect, Beijing 100083, Peoples R China

[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

关键词: Pipeline steel;    Hydrogen induced plasticity;    Stress corrosion cracking;    Soil environments;   

DOI  :  10.1016/j.msea.2016.02.019

来源: Elsevier

【 摘 要 】

The susceptibility to stress corrosion cracking (SCC) of X70 pipeline steel under cathodic protection in near-neutral pH and acidic solutions was investigated by slow-strain-rate tensile test, circumferential notch tensile (CNT) test, and three-point-bending (TPB) test. Results confirmed the existence of a hydrogen-induced plasticity (HIP) effect within a particular range of cathodic potentials. HIP effect lowered the SCC risk of X70 steel by releasing stress concentration at crack-initiation spots and then decreasing the stress intensity. Crack-growth behavior examined by CNT and TPB tests proved the existence of an HIP effect. (C) 2016 Elsevier B.V. All rights reserved.

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