Chromium interaction with TiO2 dispersoids in oxide dispersion strengthened ferritic steel

Auger electron spectroscopy and energy filtering TEM were used to study all oying element distributions in the vicinity of matrix-TiO2, dispersoid inte rphase boundaries in an Fe-Cr ferritic steel strengthened by dispersed TiO2 particles. Pronounced interfacial Cr segregation was found to occur in the course of annealing at 700 degrees C. The Cr segregation also leads to Cr diffusion into the dispersoids and to the formation of oxide phases with di fferent Cr/Ti ratios. The observed Cr segregation is described in terms of diffusion into the field of elastic stresses. MST/4262.