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Report No.
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Character evaluation of strength in dispersion stlengthened ferritic steel(2)

Nakashima, Hideharu*; not registered; not registered; Yoshida, Fuyuki*; not registered

In order to clalify the origin of strength anisotropy in ODS ferritic steel with Y$$_{2}$$O$$_{3}$$ particles at high temperatures, the threshold stress was measured by the stress abruptly loading test at 650 $$^{circ}$$C and the effect of grain-boundary sliding on the high-temperature strength was clarified. The results are summalized as follows. (1)The threshold stress obtained by the stress abruptly loading test decreased from the Orowan stress to the void-hardening stress as the time under load elapsed. This behavior is well explained by the attractive interaction between dislocations and particles. (2)The grain-boundary sliding was clearly observed for grain boundaries in-clined by 45$$^{circ}$$ to the stress axis. The threshold stress for the high-temperature deformation accompanying grain-boundary sliding agreed with the threshold stress obtained by the stress abruptly loading test. Therefore, it is considered that grain interior deformation induces the grain-boudary sliding of the ODS ferritic steel at high temperatures.

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