Subgrain growth during creep of a tempered martensitic 12% Cr-steel

The results of Nilsvang, Eggeler and llschner on subgrain growth in X 20 CrMoV 12 1 during creep are interpreted in terms of dynamic subgrain growth. It turns out that relatively large strains are needed to establish the steady-state subgrain structure, implying that the technically relevant part of creep occurs in the transient range.