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Amorphization under fracture surface in hydrogen-charged and low- temperature tensile-tested austenitic stainless steel
Philosophical Magazine Letters ( IF 1.2 ) Pub Date : 2020-11-12 , DOI: 10.1080/09500839.2020.1841915
A. Harada 1 , K. Kusunoki 1 , K. Moritani 1 , K. Matsumoto 2 , M. Hatano 2 , Y. Horibe 1
Affiliation  

ABSTRACT 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.

中文翻译:

充氢低温拉伸奥氏体不锈钢断口下非晶化

摘要 采用聚焦离子束法和透射法相结合,研究了在-70°C 下进行低应变率拉伸试验的充氢稳定奥氏体 SUS 316L 不锈钢断口正下方的微观结构。电子显微镜。在断裂表面的板条状结构下发现了化学成分与多晶区几乎相同的非晶区,尽管没有出现因氢而导致的拉伸性能劣化。在非晶区,观察到具有波浪形对比的带状区域,这些区域往往伴随着边界处的裂纹。
更新日期:2020-11-12
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