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

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• 作者：Z.Y. Liu^a ; ^b ; ^{liuzhiyong7804@ustb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; X.Z. Wang^a ; C.W. Du^a ; ^b ; J.K. Li^a ; ^b ; X.G. Li^a ; ^b ; ^c ; ^{lixiaogang99@ustb.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Pipeline steel ; Hydrogen induced plasticity ; Stress corrosion cracking ; Soil environments
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：21 March 2016
• 年：2016
• 卷：658
• 期：Complete
• 页码：348-354
• 全文大小：1503 K

文摘

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.