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Electrochemical Characterization on the Potential Dependent Stress Corrosion Cracking Mechanism of 10Ni8CrMoV High Strength Steel

机译:10Ni8CrMoV高强度钢的电位相关应力腐蚀开裂机理的电化学表征

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摘要

Stress corrosion cracking (SCC) of 10Ni8CrMoV high strength steel influenced by applied potentials in simulated seawater are investigated by combining slow strain rate tensile (SSRT) tests with electrochemical measurements. The potential region corresponding to different cracking mechanism is divided, and the SCC susceptibility is also discussed. The results show that the potential dependent SCC mechanism can be given theoretically by using potentiodynamic polarization at different scanning rate, cyclic voltam-metry and dynamic electrochemical impedance spectroscopy (DEIS) measurements, which includes ductile fracture through slip separation with serious uniform corrosion, transgranular SCC (TGSCC) under anodic dissolution (AD), retarded crack growth under the cathodic protection, and intergranular SCC (IGSCC) under hydrogen embrittlement (HE). With the negative shift of the potential, the SCC susceptibility of the steel increases firstly above the open circuit potential (OCP) and decreases later under the cathodic protection, then increases again below the hydrogen evolution potential. The bainite lath grain boundary of 10Ni8CrMoV steel has opposite effects on TGSCC and IGSCC.
机译:通过将慢应变速率拉伸(SSRT)试验与电化学测量相结合,研究了10Ni8CrMoV高强度钢受模拟海水中施加电势影响的应力腐蚀开裂(SCC)。划分了对应于不同裂解机理的潜在区域,并讨论了SCC敏感性。结果表明,通过在不同扫描速率下使用电动力极化,循环伏安法和动态电化学阻抗谱(DEIS)测量,可以从理论上给出与电位相关的SCC机理,其中包括通过滑移分离产生的韧性断裂以及严重的均匀腐蚀,跨晶SCC (TGSCC)在阳极溶解(AD)下,在阴极保护下延迟了裂纹的扩展以及在氢脆(HE)下的晶间SCC(IGSCC)。随着电势的负移,钢的SCC磁化率首先在开路电势(OCP)以上增加,然后在阴极保护下降低,然后在氢析出电势以下再次增加。 10Ni8CrMoV钢的贝氏体板条晶界对TGSCC和IGSCC具有相反的作用。

著录项

  • 来源
    《ISIJ international》 |2017年第5期|888-894|共7页
  • 作者单位

    Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection, 149-1 Zhuzhou Road, Laoshan District, Qingdao, 266101 China;

    Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection, 149-1 Zhuzhou Road, Laoshan District, Qingdao, 266101 China;

    Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection, 149-1 Zhuzhou Road, Laoshan District, Qingdao, 266101 China;

    Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection, 149-1 Zhuzhou Road, Laoshan District, Qingdao, 266101 China;

    Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection, 149-1 Zhuzhou Road, Laoshan District, Qingdao, 266101 China;

    Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection, 149-1 Zhuzhou Road, Laoshan District, Qingdao, 266101 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    high strength steel; stress corrosion cracking (SCC); applied potential; electrochemistry; seawater;

    机译:高强度钢应力腐蚀开裂(SCC);应用潜力;电化学海水;

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