抄録
Effects of strain rate and hydrogen on crack propagation from a notch were investigated using a Fe-33Mn-1.1C steel by tension tests conducted at a cross head displacement speeds of 10−2 and 10−4 mm/s. Decreasing cross head displacement speed reduced the elongation by promoting intergranular crack initiation at the notch tip, whereas the crack propagation path was unaffected by the strain rate. Intergranular cracking in the studied steel was mainly caused by plasticity-driven mechanism of dynamic strain aging (DSA) and plasticity-driven damage along grain boundaries. With the introduction of hydrogen, decrease in yield strength due to cracking at the notch tip before yielding as well as reduction in elongation were observed. Coexistence of several hydrogen embrittlement mechanisms, such as hydrogen enhanced decohesion (HEDE) and hydrogen enhanced localized plasticity (HELP) were observed at and further away from the notch tip resulting in hydrogen assisted intergranular fracture and cracking which was the key reason behind the ductility reduction.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 1125-1139 |
| ページ数 | 15 |
| ジャーナル | International Journal of Hydrogen Energy |
| 巻 | 45 |
| 号 | 1 |
| DOI | |
| 出版ステータス | Published - 2020 1月 1 |
ASJC Scopus subject areas
- 再生可能エネルギー、持続可能性、環境
- 燃料技術
- 凝縮系物理学
- エネルギー工学および電力技術
UN SDG
この成果は、次の持続可能な開発目標に貢献しています
