Numerical modeling of the influence of process conditions on hydrogen transport at microstructural level
Mohamed Hassan, Ruhr-Universitšt Bochum, Bochum, Germany
Hydrogen transport behavior in metals is greatly influenced by their microstructure. Different types of trapping sites like dislocations and grain boundaries can result in significant trapping effect which not only increases total hydrogen concentration but also has a significant effect on diffusivity. The hydrogen transport behavior in metals is also influenced by the application of mechanical loading. Therefore, for the proper modeling of hydrogen diffusion, these influences must be considered. In order to realize this, a micromechanical model based on coupled crystal plasticity and hydrogen diffusion is developed and applied to a polycrystalline microstructure to study the trapping effect of dislocations through a series of simulation tests. \ First, a study of a precharged material is carried out where hydrogen is allowed to redistribute under the influence of mechanical loading applied as 20% biaxial strain. It is observed that two locations emerge in the material at which locally.
Session T2: Tuesday, 26 June 2018
End: 03:15 p.m.