About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-59: Effect of Replacing Ni by Cu on Hydrogen Embrittlement in Austenitic Stainless Steel |
Author(s) |
Hyung Jun Cho, Sung-Joon Kim |
On-Site Speaker (Planned) |
Hyung Jun Cho |
Abstract Scope |
Austenitic stainless steels are mainly used as structure materials for hydrogen facilities due to their high hydrogen embrittlement resistance. In this work, three austenitic stainless steels that have different contents of Ni and Cu were investigated to elucidate the effect of Ni and Cu on phase stability and hydrogen embrittlement. XRD analysis revealed that Cu stabilizes the austenite phase as effectively as Ni. However, the degree of hydrogen embrittlement increased as Ni was replaced by Cu. The amount of desorbed hydrogen and deformation mode differed in the three alloys. Diffusivity increased but solubility decreased as Ni was replaced by Cu. In addition, twinning was the main deformation mode in Ni-added alloy, while tangled dislocation developed in Cu-replaced alloy. These factors seemed to cause difference in microcrack initiation and propagation after hydrogen charging and deformation. Thus, different interaction with hydrogen and dislocation behavior was responsible for the difference in hydrogen embrittlement. |
Proceedings Inclusion? |
Undecided |