Effect of H₂S partial pressure on the tensile properties of A350LF2 steel in the absence and presence of pre-immersion

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• 作者：Yameng Qi^a ; Hongyun Luo^a ; ^{luo7128@163.com" class="auth_mail} ; Shuqi Zheng^b ; Changfeng Chen^b ; Zhenguo Lv^b ; Maoxian Xiong^b
• 关键词：Carbon steel ; H2S partial pressure ; Pre-immersion ; Hydrogen embrittlement ; Slow strain rate test
• 刊名：Materials Science and Engineering: A
• 出版年：15 July 2014
• 年：2014
• 卷：609
• 期：Complete
• 页码：161-167
• 全文大小：3188 K

文摘

Effect of H₂S partial pressure (P_H2S)$\left(P_{{\mathrm{H}}_2\mathrm{S}}\right)$ on the tensile properties of A350LF2 steel with and without pre-immersion was investigated by slow strain rate testing and electrochemical impedance spectroscopy. The results show that relative tensile strength and plasticity loss increased with increasing P_H2S$P_{{\mathrm{H}}_2\mathrm{S}}$ in the absence and presence of pre-immersion. Greater tensile property damage occurred in steel without pre-immersion compared to that with pre-immersion. The relative plasticity loss increment of steel without pre-immersion was larger than that with pre-immersion as P_H2S$P_{{\mathrm{H}}_2\mathrm{S}}$ was increased from 0.1 MPa to 1.6 MPa. Fractography exhibited flat brittle fracture on the samples without pre-immersion and mixed ductile-brittle fracture on the pre-immersed samples. Furthermore, the embrittled regions on the fracture surface of pre-immersed specimens increased with P_H2S$P_{{\mathrm{H}}_2\mathrm{S}}$. In addition, no cracks existed in the steel after pre-immersion. The cracks on the fracture surface of steel could be attributed to the combination of tensile stress and high hydrogen concentration induced by the hydrogen diffusion and accumulation during the tensile test.