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Effect of H2S on stress corrosion cracking and hydrogen permeation behaviour of X56 grade steel in atmospheric environment

机译:H 2 S对大气环境下X56级钢应力腐蚀开裂和氢渗透行为的影响

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摘要

Susceptibility to stress corrosion cracking of X56 steel and its relationship with hydrogen permeation behaviour in atmospheric environment containing H2S was investigated by hydrogen permeation tests at a slow strain rate. The results show that: the fracture strain decreases with the decrease of strain rate under the same experimental conditions; the fracture strain also decreases with the increase of H2S concentration under the same strain rate, and the increased concentration of H2S has no significant effect on the hydrogen permeation in the first wet, etc. dry cycle, however has lead to increased hydrogen permeation in the later cycles. The SEM images of the fractured surfaces show clear evidences of enhanced stress corrosion cracking susceptibility by H2S.
机译:通过在低应变速率下的氢渗透试验,研究了X56钢在含H 2 S的大气环境中应力腐蚀开裂的敏感性及其与氢渗透行为的关系。结果表明:在相同的实验条件下,断裂应变随着应变率的降低而减小。在相同应变速率下,断裂应变也随H 2 S浓度的增加而减小,H 2 S浓度的增加对氢的渗透没有明显影响。但是,第一个湿式等干燥循环在随后的循环中导致氢渗透增加。断裂表面的SEM图像清楚地证明了H 2 S增强了应力腐蚀裂纹敏感性。

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