FeCrAl alloys are proposed and being intensively investigated as alternative accident tolerant fuel (ATF) cladding for nuclear fission application. Herein, the influence of major alloy elements (Cr and Al), reactive element effect and heating schedules on the oxidation behavior of FeCrAl alloys in steam up to 1500 °C was examined. In case of transient ramp tests, catastrophic oxidation, i.e. rapid and complete consumption of the alloy, occurred during temperature ramp up to above 1200 °C for specific alloys. The maximum compatible temperature of FeCrAl alloys in steam increases with raising Cr and Al content, decreasing heating rates during ramp period and doping of yttrium. Isothermal oxidation resulted in catastrophic oxidation at 1400 °C for all examined alloys. However, formation of a protective alumina scale at 1500 °C was ascertained despite partial melting. The occurrence of catastrophic oxidation seems to be controlled by dynamic competitive mechanisms between mass transfer of Al from the substrate and transport of oxidizing gas through the scale both toward the metal/oxide scale interface.

提出了FeCrAl合金，并对其进行了深入研究，以作为用于核裂变应用的替代耐事故燃料（ATF）包层。在此，研究了主要合金元素（Cr和Al），反应性元素效应和加热时间表对FeCrAl合金在高达1500°C的蒸汽中的氧化行为的影响。在瞬态斜升试验的情况下，特定合金的温度斜升到1200°C以上时会发生灾难性氧化，即合金的快速和完全消耗。FeCrAl合金在蒸汽中的最高相容温度随Cr和Al含量的增加，在升温期间降低加热速率和钇的掺杂而增加。等温氧化导致所有被测合金在1400°C发生灾难性氧化。然而，尽管部分熔化，但仍确定在1500°C时形成保护性氧化铝垢。灾难性氧化的发生似乎由铝从基材的质量转移与氧化气体通过氧化皮向金属/氧化物氧化皮界面的传输之间的动态竞争机制所控制。