Abstract
14Cr-4.5Al ODS steels were prepared by adding Y2Ti2O7 and Y2O3 nanoparticles respectively. Bilayer-structure corrosion scales were formed while the Y2Ti2O7-ODS steel showed a lower mass gain of 108.1 mg/dm2 in SCW for 1500 h. Compared with Y2O3, Y2Ti2O7 with finer size and higher number density exhibited more effective hindrance impacts on the diffusion of ions. Furthermore, adding Y2Ti2O7 in the ODS steel can provide more zero valent Al to form alumina film through inhibiting the formation of coarse Y-Al-O particles. Our work demonstrates that substituting Y2O3 with Y2Ti2O7 is an effective route to improve the corrosion resistance of Al-adding ODS steels.
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