Abstract
Current paper presents a study of the α–α′ phase separation during prolonged heat treatments at 400 and 450 °C of 14%Cr oxide dispersion strengthened steel. Vickers hardness, thermo-electric power and differential scanning calorimetry measurements enabled to conclude that α′ precipitates already after 5,000 hr at 400 °C, while at 450 °C precipitation is detected only after 10,000 hr. Yet, the amount of α′ after 10,000 hr at 450 °C was larger. The results, combined with thermodynamic and diffusion length calculations, affirm that in 14%Cr ODS steel the separation occurs by the nucleation and growth mechanism rather than spinodal decomposition.
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