Mapping of 475 °C embrittlement in ferritic Fe–Cr–Al alloys

Radiation tolerance of neutron-irradiated model Fe–Cr–Al alloys

“…Traditional Fe-Cr-Al alloys targeted for high-temperature oxidizing environments, such as PM2000™ or APMT™, use high (i.e., >15 wt %) chromium solute additions, which have been known to exhibit phase instability in typical LWR clad operating temperatures [9,[17][18][19][20][21][22][23][24][25]. This phase instability is the result of the miscibility gap in the body-centered-cubic (BCC) Fe-Cr system [26][27][28] and has been indicated to exist within the BCC Fe-Cr-Al ternary system as well [9,[17][18][19][20][21][22][23][24][25]. High-chromium-content Fe-Cr and Fe-Cr-Al decomposes into the Fe-rich α and Cr-rich α' phases.…”

High Temperature Steam Oxidation Testing of Candidate Accident Tolerant Fuel Cladding Materials

“…For the 22.5 and 25%Cr alloys, the Cr-rich oxide was protective but not adherent. Such high alloy Cr content raises concerns about α´ formation and embrittlement [22][23][24][25], especially under irradiation. These results suggest that there are limited prospects for current 9-14%Cr ODS steels, which have attracted interest for other nuclear applications [26][27][28].…”

“…Lowering the Al and Cr contents from the typical 20Cr-5Al composition could result in an alloy more suitable for thin walled tubing with better mechanical properties and weldability. As with the Fe-Cr alloys, the 20%Cr level raises concerns about α´ formation and embrittlement [24,29]. The synergism between Cr and Al contents is the well-known "third element" effect [30], where less Al is needed in the alloy to form an external Al 2 O 3 scale as the Cr content is increased.…”

The Effects of Si and Al Alloying on α/γ Phase Equilibria in Fe-Cr-Ni-Mn Based Ternary and Quaternary Systems

“…[13][14][15] As part of the endeavor to understand the feasibility of using Fe-Cr-Mn-Ni based alloys as filler metals during welding, this study reports the effects of Si and Al alloying on phase boundaries between a/c phases in a wide composition range in the Fe-Cr-Mn-Ni-Si and Fe-Cr-Mn-Ni-Al quinary systems using the same methodology as in previous study. [12] The experimentally obtained results are compared with thermodynamic calculation using Thermo-calc software.…”