|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Diffusion, Trapping Mechanisms and Some Implications on Local Approach of Fracture in Martensitic Steel
||Stéphane Cohendoz, Cyril Berziou, Christelle Rebere, Remy Milet, Catherine Savall, Abdelali Oudriss, Jamaa Bouhattate, Juan Creus, Xavier Feaugas
|On-Site Speaker (Planned)
Hydrogen diffusion and trapping mechanisms have been revisited in martensitic steels with a large variability of microstructural parameters. Electrochemical permeation set-up associated with thermal desorption spectroscopy and elastic theoretical calculations was methodically used to find a relationship between physical parameters associated with diffusion and trapping and microstructure evolutions. Using FEM calculations and a new design of permeation testing under tensile loading until fracture we revisit the question of hydrogen embrittlement of martensitic steel. We explore the impact of mobile and trapped hydrogen on ductile and brittle fracture of martensitic steel. We highlight that trapped hydrogen promotes ductile fracture and in opposite, that the mobile hydrogen conduces to a quasi-clivage fracture mode at a scale of martensitic laths. Finally, the contribution of plasticity and hydrostatic state on damage is discussed using local approach of fracture.
||Planned: Supplemental Proceedings volume