Amorphization under fracture surface in hydrogen-charged and low- temperature tensile-tested austenitic stainless steel
Amorphization under fracture surface in hydrogen-charged and low- temperature tensile-tested austenitic stainless steel
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充氢低温拉伸奥氏体不锈钢断裂表面非晶化
DOI：
10.1080/09500839.2020.1841915
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发表时间：
2021
影响因子：
1.2
通讯作者：
and Y. Horibe
中科院分区：
文献类型：
--
作者：
A. Harada;K. Kusunoki;K. Moritani;K. Matsumoto;M. Hatano;and Y. Horibe
采用聚焦离子束法和透射电镜相结合的方法，研究了在- 70℃下进行低应变速率拉伸试验的充氢稳定奥氏体sus316l不锈钢断口以下的微观组织。在断口板条状结构下发现了与多晶区化学成分几乎相同的非晶态区，但未出现氢对拉伸性能的破坏。在非晶区，观察到具有波浪形对比的带状区域，其边界常伴有裂纹。非晶态区与带状区域的存在表明，在低温拉伸试验中，充氢SUS 316L不锈钢的非晶态化是由于高密度的空位伴随着过量空位的聚集而发生的。
The microstructure just below the fracture surface in hydrogen-charged stable austenitic SUS 316L stainless steel, which was subjected to a low strain rate tensile test at −70°C, was studied by a combination of the focused-ion-beam method and transmission electron microscopy. An amorphous region with a chemical composition almost identical to that of the polycrystalline region was found under the lath-like structure on the fracture surface, although no deterioration of tensile properties by hydrogen appeared. In the amorphous region, band-like regions with wavy contrasts were observed, which were often accompanied by cracks at the boundaries. The presence of the amorphous region with band-like regions implies that amorphization occurred due to high-density vacancies accompanied by agglomerations of excess vacancies in the hydrogen-charged SUS 316L stainless steel that was tensile-tested at low temperatures.
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DOI：
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发表时间：
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期刊：
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影响因子：
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