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Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

机译：690MPa级海洋工程钢微观结构与氢气降解的相关性

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摘要

Electrochemical H charging, hydrogen permeation, and hydrogen-induced cracking (HIC) behavior of 690 MPa grade steel substrate and different heat-treatment states (annealed, quenched, normalized, tempered) are investigated by cyclic voltammetry (CV), hydrogen permeation, electrochemical H charging, and slow strain rate tensile test (SSRT). The results show that hydrogen diffuses through the steel with the highest rate in base metal and the lowest rate in annealed steel. The hydrogen-induced cracks in base metal show obvious step shape with tiny cracks near the main crack. The cracks of annealed steel are mainly distributed along pearlite. The crack propagation of quenched steel is mainly transgranular, while the hydrogen-induced crack propagation of tempered steel is along the prior austenite grain boundary. HIC sensitivity of base metal is the lowest due to its fine homogeneous grain structure, small hydrogen diffusion coefficient, and small hydrogen diffusion rate. There are many hydrogen traps in annealed steel, such as the two-phase interface which provides accommodation sites for H atoms and increases the HIC susceptibility.
机译：通过循环伏安法（CV），氢渗透，电化学，研究了690MPa级钢基材和不同热处理状态（退火，淬火，归一化，回火）的电化学H充电，氢渗透和氢气诱导的裂化（HIC）行为（退火，淬火，归一化，回火） H充电，慢速应变速率拉伸试验（SSRT）。结果表明，氢气扩散通过钢，基础金属中的最高速率和退火钢中的最低速率。基础金属中的氢诱导的裂缝显示出明显的阶梯形状，在主要裂缝附近的微小裂缝。退火钢的裂缝主要沿珠光体分布。淬火钢的裂纹繁殖主要是跨晶，而钢化钢的氢诱导的裂纹谱沿前奥氏体晶界。由于其精细的均匀晶粒结构，小氢扩散系数和小的氢气扩散速率，基础金属的HIC敏感性是最低的。退火钢中有许多氢陷阱，例如两相界面，其为H原子提供容纳位点并增加HIC易感性。

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