Analyses of hydrogen distribution around fatigue crack on type 304 stainless steel using secondary i
Analyses of hydrogen distribution around fatigue crack on type 304 stainless steel using secondary i
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DOI：
10.1016/j.ijhydene.2011.03.111
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
N. Saintier;Tohru Awane;J. Olive;Shuzo Matsuoka;Y. Murakami
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文献类型：
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作者：
N. Saintier;Tohru Awane;J. Olive;Shuzo Matsuoka;Y. Murakami
对 304 型奥氏体不锈钢进行二次离子质谱 (SIMS) 分析。在暴露于氢气（10 MPa，358 K）的退火样品上，元素深度剖面 SIMS 模式能够定量描述由菲克定律计算出的氢剖面含量。根据疲劳裂纹尾流的 SIMS 分析（在 0.6 MPa 和 RT 的氢气中传播），可以计算裂纹尖端区域的表观扩散率和溶解度。变形区域的表观溶解度和扩散率分别比退火材料高两倍和五个数量级。在裂纹尖端周围发现了高氢含量，其中塑性变形发育良好（明显的滑移活动）。据推测，高表观扩散率是由于裂纹尖端的循环塑性活动引起的氢传输增强所致。
Secondary Ion Mass Spectrometry (SIMS) analyses were carried out on type 304 austenitic stainless steel. On annealed specimen exposed to hydrogen (10 MPa, 358 K), Element Depth Profiles SIMS mode was able to describe quantitatively the hydrogen profile content computed by the Fick’s law. Based on SIMS analyses on the wake of a fatigue crack (propagation in hydrogen gas at 0.6 MPa and RT), it was possible to compute an apparent diffusivity and solubility in the crack tip region. The apparent solubility and diffusivity in the deformed regions were two times and five orders of magnitude higher than the ones on annealed material, respectively. High hydrogen content was found around the crack tip, where the plastic deformation was well developed (pronounced slip activity). The high apparent diffusivity is presumed to result from enhanced hydrogen transport induced by cyclic plastic activity at the crack tip.