About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-65: Hydrogen Effect on 15Cr-15Mn-4Ni based Stable Austenitic Stainless Steels with Carbon or Nitrogen |
Author(s) |
Kyung-Shik Kim, Jee-Hyun Kang, Sung-Joon Kim |
On-Site Speaker (Planned) |
Kyung-Shik Kim |
Abstract Scope |
Stable austenitic stainless steels are used as structural materials for hydrogen environment due to high solubility and low diffusivity of hydrogen and the suppression of martensitic transformation. Carbon and nitrogen are reported to enhance the resistance to hydrogen embrittlement in the sense of stabilizing austenite. Fe-15Cr-15Mn-4Ni based steels with 0.3 weight percent of carbon or nitrogen were electro-chemically charged with hydrogen and deformed to investigate the degradation of tensile properties from hydrogen with each interstitial element. The elongation of both alloys decreased, and the cracks formed at the surface were found to be responsible for the degradation. Cracks were initiated at the triple junction of the grain boundaries. With carbon, the cracks propagated inside the specimen through grains forming cleavage fracture, whereas with nitrogen, intergranular fracture was observed. Strain hardening rates went through different trends and the different effects of carbon and nitrogen on hydrogen embrittlement could be explained. |
Proceedings Inclusion? |
Undecided |