FTMP場の理論に基づく階層構造を有する高Crフェライト系耐熱鋼に対するモデル化とクリープ変形解析

抄録

This study extends the previous seven-grained embedded packet model for a high Cr heat-resistant ferritic steel to that composed of 23-grained multi-prior austenitic grains, for the purpose representing more realistic multiscale simulations based on FTMP, in terms of the inhomogeneous recovery-triggered accelerated creep rupture processes peculiar to the material systems of concern. The effect of interaction/recovery contributions are systematically examined, where the recovery model is represented by the spatio-temporal mixed component of the incompatibility tensor field in FTMP. Point-wise duality diagram representation of the simulation results reveals that the energy storing region, which needed to be additionally introduced in the previous model, is naturally brought about within the sample, implying one of the significant contributions from the “grain aggregate” scale in the present context.