FTMP場の理論に基づくラスマルテンサイト組織のモデル化とクリープ変形解析

抄録

This study addresses hierarchical modeling of high Cr steels with lath martensite structures yielding the inhomogeneous recovery-triggered accelerated creep rupture at relatively lower stress conditions, based on field theory of multiscale plasticity (FTMP). From dawn-to-dusk scheme that involves natural modeling of the composing lath block units as well as building-block type constructions of the lath packet structures is proposed, together with the interaction field-based recovery modeling between high dense dislocations in the lath (Scale A) and the lath block structure (Scale B). The contributions of the spatial interaction from Scale A to B via the incompatibility tensor field is extensively discussed in terms of its projection direction in introducing in the hardening law of the constitutive equation used. It turns out that the slip normal direction as the projection direction exhibits the primary role for speeding the localized recovery ultimately leading to the accelerated creep rupture.