S. Ukai et al., ALLOYING DESIGN OF OXIDE DISPERSION-STRENGTHENED FERRITIC STEEL FOR LONG-LIFE FBRS CORE MATERIALS, Journal of nuclear materials, 204, 1993, pp. 65-73
Oxide dispersion strengthened (ODS) ferritic steels with excellent swe
lling resistance and superior high temperature strength are prospectiv
e cladding materials for advanced fast breeder reactors. The addition
of Ti in 13Cr-3W ODS ferritic steels improved the high temperature str
ength remarkably by the formation of uniformly distributed ultra-fine
oxide particles. ODS ferritic steels have a bamboo-like grain structur
e and a strong deformation texture. The decrease of creep rupture stre
ngth in the bi-axial direction compared to the uni-axial direction is
attributed mainly to this unique bamboo grain structure. Nearly equiva
lent creep rupture strength for both bi-axial and uni-axial direction
was successfully attained by introducing the alpha to gamma transforma
tion in ODS martensitic steel.