Effect of pre-strain on the electrochemical and stress corrosion cracking behavior of E690 steel in simulated marine atmosphere

Effect of pre-strain on the electrochemical and stress corrosion cracking behavior of E690 steel in simulated marine atmosphere
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预应变对E690钢在模拟海洋大气中电化学和应力腐蚀开裂行为的影响

DOI:
10.1016/j.oceaneng.2019.04.044
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发表时间:
2019-06
期刊:
影响因子:
5
通讯作者:
Xiaogang Li
Xiaogang Li
中科院分区:
工程技术2区
文献类型:
--
作者:
Hongchi Ma;Yi Fan;Zhiyong Liu;Cuiwei Du;Xiaogang Li

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采用慢应变速率试验和恒应变腐蚀试验,研究了预应变对E690钢在模拟海洋大气中应力腐蚀开裂行为的影响,并探讨了应力腐蚀的萌生机制。结果表明,预应变可以增强E690钢在模拟海洋大气中的阳极反应和阴极反应。E690钢在含有亚硫酸盐的海洋气氛中恒定预应变暴露4天后,会产生晶间腐蚀和微裂纹,从而对E690钢的力学性能和随后的应力腐蚀开裂行为造成不利影响。亚硫酸盐晶界和原奥氏体晶界的大角度晶界的存在是沿晶间腐蚀和应力腐蚀的主要原因。
Slow strain rate tests and constant strain corrosion tests were employed to study the effect of pre-strain on stress corrosion cracking behavior and initiation mechanism of E690 steel in simulated marine atmosphere. Results revealed that pre-strain can result in enhancement of both anodic and cathodic reactions of E690 steel in simulated marine atmosphere. Intergranular corrosion and microcracks formed after 4 days of exposure in sulfite-containing marine atmosphere at constant pre-strain, which consequently caused detrimental effects on the mechanical properties and subsequent SCC behavior of E690 steel. The presence of sulfite and high-angle grain boundaries of prior austenite grain boundaries (PAGBs) accounted for the intergranular corrosion and SCC initiation along PAGBs.
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