Towards Modeling Intergranular Stress Corrosion Cracks on Grain Size Scales

Development of advanced models at the grain size scales has so far been mostly limited to simulated geometry structures such as for example 3D Voronoi tessellations. The diculty came from a lack of non-destructive techniques for measuring the microstructures. In this work a novel grain-size scale approach for modelling intergranular stress corrosion cracking based on as-measured 3D grain structure of a 400 m stainless steel wire is presented. Grain topologies and crystallographic orientations are obtained using a diraction contrast tomography, reconstructed within a detailed nite element model and coupled with advanced constitutive models for grains and grain boundaries. The wire is composed of 362 grains and over 1600 grain boundaries. Grain boundary damage initialization and early development is then explored for a number of cases, ranging from isotropic elasticity up to crystal plasticity constitutive laws for the bulk grain material. In all cases the grain boundaries are modeled using the cohesive zone approach. The feasibility of the approach is explored. Keywords: Intergranular cracking, Image Base Modelling, Polycrystalline aggregate, Finite Element Modelling.

SIMONOVSKI Igor;  CIZELJ Leon; 

2012-04-20

ELSEVIER SCIENCE SA

JRC66778

0029-5493,   

http://www.sciencedirect.com/science/article/pii/S0029549311006571,    https://publications.jrc.ec.europa.eu/repository/handle/JRC66778,   

10.1016/j.nucengdes.2011.08.032,