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The effects of thermomechanical treatment on microstructural changes and void swelling in a DT2203YO5-grade 13%Cr oxide-dispersion-strengthened (ODS) ferritic alloy have been studied following ion irradiations to a damage level of 50 dpa at 475°C with 600 appm helium gas implantation. Swelling in a solution treated and aged (STA) condition ranges from 0.07 to 0.24% due to cast-to-cast variations, whilst in a solution treated, cold-worked and aged (STCWA) condition the swelling decreases to 0.025%. Cavities are in general irregularly shaped, non-uniformly distributed and frequently attached to small yttria dispersoid particles.
The results confirm that this ODS ferritic steel exhibits low irradiation-induced swelling in the presence of high gas concentrations, as required for advanced fast and fusion reactor applications. The observed sensitivity of irradiation-induced swelling to compositional or processing variables implies that ODS ferritic alloys can be further optimized for high radiation resistance.
ODS ferritic steel, thermomechanical treatment, void swelling, ion irradiations, fast and fusion reactors
University College, Swansea,