CREEP-BEHAVIOR OF ODS STEELS

The creep properties of oxide dispersion strengthened (ODS) steels, DT and DY alloys,were investigated in the temperature range 500-700 degr ees C. The evaluation of the creep threshold stress was performed by c reep dip tests. The Norton's creep law, corrected with this experiment al threshold stress, gives a good description of the creep behaviour o f DT and DY alloys. Transmission electron microscopy (TEM) observation s showed the dislocations to be pinned to the small oxide particles ba sed on thermally activated dislocation detachment from oxide particles . The results are discussed in the light of Arzt's model.