About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Hydrogen Diffusion and Trapping in Multiphase Materials: A Multiscale Model for Non-point Trapping |
Author(s) |
Fernando León Cázares, Dominic Dziedzic, Enrique Galindo-Nava |
On-Site Speaker (Planned) |
Fernando León Cázares |
Abstract Scope |
Hydrogen embrittlement is a major degrading phenomenon in numerous structural alloys. A key issue to anticipate such behaviour is to predict the role of the microstructure on the hydrogen kinetics within the lattice. However, most diffusion models typically assume all defects to be point traps, which falls short in describing the effects of microstructural features such as secondary phases. In this work, hydrogen charging and thermal desorption spectroscopy are explored in duplex steels with varied austenitic contents to investigate the trapping effects of this phase. The behaviours are reproduced with a novel model for hydrogen diffusion in multiphase alloys that combines continuum diffusion laws at two different length scales. Parametric analyses yield clear size and volume fraction effects, which are then used to explain the behaviours of typical retained austenite morphologies in steels. An additional equilibrium model for volumetric phases and the regimes where this is valid are further discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Modeling and Simulation, Other |