1209 高Crフェライト鋼の不均一なマルチスケール組織とクリープ変形挙動(キーノート講演,OS-12C 材料の組織・強度に関するマルチスケールアナリシス(変形と微視組織),OS-12 材料の組織・強度に関するマルチスケールアナリシス)

概要

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Great advancement has been achieved in the analysis of specific microstructure instability causing a loss of creep strength at 550℃ and above. The loss of creep rupture strength has extensively been investigated for a number of tempered martensitic 9 to 12 Cr steels. The proposed mechanisms are due to the occurrence of microstructure degradation during creep exposure, especially due to inhomogeneous or preferential recovery of martensitic microstructure in the vicinity of prior austenite grain boundaries. The precipitation of Z-phase, M_6X carbonitrides and Fe_2(W,Mo) Laves phase during creep promotes inhomogeneous microstructure evolution.
2005-11-17