| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Crack Initiation and Propagation Analyses of Hydrogen-related Fracture Surfaces of Tempered Martensitic Steel |
| Author(s) |
Takahiro Chiba, Takashi Yasukawa, Kenichi Takai |
| On-Site Speaker (Planned) |
Takahiro Chiba |
| Abstract Scope |
The hydrogen-related crack initiation and propagation in tempered martensitic steel were investigated through fracture surface topography analysis (FRASTA) and crystallographic orientation analysis. The hydrogen-related fracture morphologies of tempered martensitic steel were characterized by intergranular and quasi-cleavage transgranular fractures. FRASTA suggested that the hydrogen-related crack initiation site was inclusion and the crack propagated from quasi-cleavage fracture to intergranular fracture near the crack initiation site. In addition, crystallographic orientation analysis suggested that intergranular fracture propagated on prior austenite grain boundaries, whereas quasi-cleavage fracture propagated along {011} planes near the crack initiation site. However, quasi-cleavage fracture consisted of not only {011} planes but also various planes. These findings indicate that the fracture propagation path changed from the intergranular fracture on the prior austenite grain boundaries to the quasi-cleavage fracture along {011} planes and various planes caused by the cross slip in body-centered-cubic lattice within the prior austenite grains by the influence of inclusion. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |