| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Effects of the Microstructure and Hydrogen Mobility on the Mechanical Behavior of Tempered Martensitic Steels |
| Author(s) |
Livia Cupertino-Malheiros, Abdelali Oudriss, Daniella Guedes, Stéphane Cohendoz, Florent Decultieux, Michel Piette, Florian Thébault, Jamaa Bouhattate, Juan Creus, Xavier Feaugas |
| On-Site Speaker (Planned) |
Abdelali Oudriss |
| Abstract Scope |
The present study aims to evaluate the influence of hydrogen on the mechanical behavior and susceptibility to hydrogen embrittlement of martensitic steels. For this objective, tensile tests with notched specimens were performed for hydrogen pre-charged and under hydrogen flux specimens, the latter was conducted in a permeation cell assembled directly on a tensile machine. Analyses of the fracture surfaces revealed that trapped hydrogen favors ductile fracture, whereas mobile hydrogen conduces to quasi-cleavage. EBSD maps showed that the quasi-cleavage fracture propagated mainly at the {101} plans. A local approach of the fracture using FEM calculations provided the distributions of hydrostatic stress, equivalent plastic strain, hydrogen concentration, and flux. This approach demonstrates that hydrogen reduced the critical stress for crack nucleation and enhanced the contribution of plasticity to the fracture process. These results are discussed in relation to the hydrogen embrittlement mechanisms, and more particularly in terms of hydrogen/plasticity interactions. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |