|About this Abstract
||2014 TMS Annual Meeting & Exhibition
||Multiscale Approaches to Hydrogen-assisted Degradation of Metals
||Random-walk Based Continuum Model of Hydrogen Diffusion and Trapping in Metals
||Jesus Toribio, Viktor Kharin
|On-Site Speaker (Planned)
Addressing the purposes of hydrogen assisted fracture (HAF) analysis, modelling of hydrogen diffusion in metals with account for physical-mechanical fields and factors of material microstructure (hydrogen trapping) is revisited. Coherent development of continuum model of diffusion and trapping is undertaken. Desired flux and balance equations in media with multiple traps are derived from the basic kinetics principles by way of extending the random walk theory towards its continuum implementation. This gives rise to novel generalised partial-differential equations of diffusion with trapping. For circumstances, which are relevant to plenty of engineering HAF cases, a series of previously suggested specialised models of trapping-affected stress-strain-assisted hydrogen diffusion in metals are retrieved by way of a chain of omissions in derived equations of terms that can become insignificant under certain circumstances, which are specified explicitly. Through this prism, the recovered simplified models are collated as regards their suitability for analyses of specific HAF situations.
||Planned: Paper Selections