Stress corrosion cracking behavior of X80 steel in artificial seawater under controlled strain rate and applied potentials
Stress corrosion cracking behavior of X80 steel in artificial seawater under controlled strain rate and applied potentials
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DOI：
10.1007/s12540-015-5132-0
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发表时间：
2015-08
影响因子：
3.5
通讯作者：
Daeho Jeong;W. Jung;Young-Ju Kim;M. Goto;Sangshik Kim
中科院分区：
文献类型：
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作者：
Daeho Jeong;W. Jung;Young-Ju Kim;M. Goto;Sangshik Kim
在人工海水（ASW）中，以1×10−4、1×10−5和1×10−6/sec的应变速率，研究了外加电位对X80钢应力腐蚀开裂（SCC）行为的影响。在应变过程中分别施加- 650，- 850，- 950和- 1,050 mVSCE的控制电位。结果表明，在海水环境中，X80钢在阳极和阴极作用下均对SCC敏感，且对应变速率敏感。在-650 mVSCE的阳极电位下，SCC在表面凹坑处启动。阴极施加电位对X80钢在ASW中SCC行为的影响更为复杂，表面损伤（包括凹坑和氢致开裂）和表面产生的氢浓度的综合作用倾向于决定SCC敏感性。通过显微组织和断口形貌观察，探讨了具有不同应用潜力的X80钢在ASW中的自熔行为。
The effect of applied potential on the stress corrosion cracking (SCC) behavior of X80 steel was examined in artificial seawater (ASW) at different strain rates of 1×10−4, 1×10−5and 1×10−6/sec. The controlled potential of −650, −850, −950 and −1,050 mVSCE, respectively, was applied during strainig. It was found that X80 steel was susceptible to SCC in seawater environment under both anodic and cathodic applied potentials and the susceptibility was sensitive to strain rate. The SCC was initiated at the surface pits under an anodic applied potential of -650 mVSCE. The effect of cathodic applied potential on the SCC behavior of X80 steel in ASW was more complex, such that the combined effect of surface damage, including pits and hydrogeninduced cracking, and hydrogen concentration generated on the surface tended to determine the SCC susceptibility. The SCC behavior of X80 steel with different applied potentials in ASW was discussed based on the microstructural and the fractographic observations.