Development of Al added high-Cr ODS steels for fuel cladding of next generation nuclear systems

On-line monitoring of oxide formation and dissolution on alloy 800H in supercritical water

“…In Fe-Ni-Cr alloys, outward diffusion of iron and nickel and reaction with oxygen leads to the formation of oxides such as Fe 3 O 4 , Fe 2 O 3 , FeO, and NiO, depending on the oxygen concentration, temperature and exposure time of SCW [19]. The high corrosion resistance of austenitic steels in SCW is attributed to the formation of a protective chromia (Cr 2 O 3 )-based oxide rather than a spinel (FeCr 2 O 4 )-based oxide [20][21][22]. Fe and Cr diffusion coefficients in Cr 2 O 3 are reported to be quite similar, while Fe diffusion in FeCr 2 O 4 is 3 times faster than Cr [23] diffusion making these oxides less protective.…”

Feasibility of using Y2Ti2O7 nanoparticles to fabricate high strength oxide dispersion strengthened Fe–Cr–Al steels

“…The addition of Al into the ODS steels resulted in high resistance to LBE corrosion even after an exposure for 5000 h due to the formation of a dense alumina layer on the surface of ODS steels [20]. Kimura and coworkers [22] showed that the addition of 4 wt.% Al remarkably enhanced the corrosion resistance of 16Cr-ODS steel in SCW by forming stable alumina layer on the surface. Recently, our group demonstrated that oxidation resistance of the 16Cr-ODS steel at 1323 K was improved more than three times by adding 4 wt.% Al [7].…”

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

“…Especially, the ferritic 14-16%Cr ODS steels are promising candidates for the usage in internal structures of nuclear reactors due to their high strength, excellent radiation, and oxidation resistance [4]. However, present NFAs show acceptable fracture toughness (i.e., higher than 100 MPa· √ m) values at lower temperatures up to 300 • C [1,5] as well as its decrease with increasing temperature.…”