Characterization of High Temperature Creep Properties in Recrystallized 12Cr-ODS Ferritic Steel Claddings.

Abstract

The high temperature strengthening mechanism of previously manufactured 12Cr-ODS ferritic steel claddings was clarified. In the recrystallized 12Cr-2W-0.3Ti-0.24Y(2)O(3)-ODS ferritic steel cladding, alphaY(2)TiO(5) type complex oxide formation was responsible for the drastic reduction of oxide particle size and the resulting shortened distance between particles, which led to superior internal creep rupture strength at 973 K because of the high resistance to gliding dislocation. Internal creep deformation was considered to be controlled by the grain boundary sliding associated with grain morphology: the near Sigma11, Sigma9 and Sigma19 coincidence boundaries with a [110] common axis.