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首页> 外文期刊>ISIJ international >Defects Responsible for Hydrogen Embrittlement in Austenitic Stainless Steel 304 by Positron Annihilation Lifetime Spectroscopy
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Defects Responsible for Hydrogen Embrittlement in Austenitic Stainless Steel 304 by Positron Annihilation Lifetime Spectroscopy

机译：通过正电子湮没寿命光谱法负责奥氏体不锈钢304的氢脆缺陷

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摘要

Hydrogen-related defects in the metastable austenitic stainless steel 304 were analyzed by positron annihilation lifetime spectroscopy to determine the factors responsible for hydrogen embrittlement. Hydrogen was introduced by the cathodic electrolysis method to the ～10-μm topmost layer which was then etched by electrochemical polishing to investigate the formation of hydrogen-induced defects in the bulk. Although hydrogen embrittlement did not occur simply upon removal of the hydrogen-charged layer, a decrease in ductility was confirmed by applying 10% tensile strain and subsequent polishing. In this latter sample a positron lifetime component of ～180 ps was detected, which is longer than that of dislocations, and disappeared upon annealing at 100°C. After further straining the sample until fracture, the formation of vacancy clusters was observed. These results suggest that hydrogen diffused to deeper regions upon application of tensile stress, where vacancy-hydrogen complexes were generated and developed into vacancy agglomerates. The detection of the precursors of the vacancy clusters, which are thought to lead to the brittle fracture, represents a fundamental step forward in the understanding of the hydrogen embrittlement process in austenitic stainless steels.
机译：通过正电子湮没寿命光谱分析亚稳奥氏体不锈钢304中的氢相关缺陷，以确定负责氢脆的因素。通过电化学抛光将阴极电解方法引入氢气中的氢气，然后通过电化学抛光蚀刻，以研究散装中氢诱导的缺陷的形成。尽管仅在除去氢气的粘合层后没有发生氢气脆化，但通过施加10％拉伸菌株和随后的抛光来确认延展性的降低。在后一种样品中，检测到〜180 ps的正电子寿命组分，其比脱位长，并且在100℃下退火时消失。在进一步将样品进一步突出直至骨折后，观察到空位簇的形成。这些结果表明，在施加拉伸应力时扩散到更深区域的氢气，其中产生空位 - 氢气复合物并开发成空位凝聚物。被认为导致脆性骨折的空位簇的前体的检测代表了理解奥氏体不锈钢中的氢脆方法的基本步骤。

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