Abstract
Ferritic and ferritic/martensitic oxide dispersion-strengthened (ODS) steels are a promising class of materials with high potential for application at high temperature and irradiation. Creep-to-rupture behavior of such steels with 12 and 14mass% chromium (Cr) was tested in stagnant oxygen-controlled liquid lead and air at 650°C and 125–400MPa engineering stress. Liquid Pb affects insignificantly creep strength of both steels in comparison to air. In general, 12Cr-ODS shows slightly better creep performance than 14Cr-ODS. A significant change in the stress exponent n of the Norton occurs around 330MPa and 380MPa for 12Cr- and 14Cr-ODS, respectively, pointing at a change in creep mechanism of the ODS steels. Additionally, brittle fracture at low stress or strain rate changes to ductile fracture at high stress/strain rate as indicated by increasing necking and strain at rupture.
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