About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Environmental Degradation of Additively Manufactured Alloys
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Presentation Title |
On the Implication of Strain Localization on the Fatigue Crack Propagation Under Hydrogen Pressure of LBM Inconel 718 |
Author(s) |
Abdelali Oudriss, Simon Puydebois, Pierre Bernard, Laurent Briottet, Xavier Feaugas |
On-Site Speaker (Planned) |
Abdelali Oudriss |
Abstract Scope |
This work aims to study the impact of hydrogen on the fatigue behavior of a nickel-base alloy 718 obtained by additive manufacturing. For that purpose, the microstructure was investigated, and fatigue tests were carried out in air, and under 300bar of H2. First, the striation spacing was examined by SEM on the fracture surface. Then, thin samples were extracted using FIB from regions containing striation to question the deformation mode associated to crack propagation with and without hydrogen. The results confirmed that the crack propagation rate is directly associated with the striation distance irrespective of the considered environment. Additionally, TEM observations have highlighted the fact that inter-shear bands spacing is correlated with the striation distance. Thus, the increase of crack growth rate under H2 is a direct effect of hydrogen which increases the dislocations sources number. These results are discussed in relation to the hydrogen embrittlement mechanisms in terms of hydrogen/plasticity interactions. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |