Abstract The microstructures and mechanical properties of deformed and annealed Nb-containing FeCrAl alloys were investigated. Fine dispersion of Fe2Nb-type Laves phase particles was observed in the bcc-Fe matrix after applying a thermomechanical treatment, especially along grain/subgrain boundaries, which effectively stabilized the recovered and recrystallized microstructures compared with the Nb-free FeCrAl alloy. The stability of recovered areas increased with Nb content up to 1 wt%. The recrystallized grain structure in Nb-containing FeCrAl alloys consisted of elongated grains along the rolling direction with a weak texture when annealed below 1100 °C. An abnormal relationship between recrystallized grain size and annealing temperature was found. Microstructural inhomogeneity in the deformed and annealed states was explained based on the Taylor factor. Annealed Nb-containing FeCrAl alloys showed a good combination of strength and ductility, which is desirable for their application as fuel cladding in light-water reactors.

中文翻译：

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Laves 相颗粒对含 Nb FeCrAl 合金回复和再结晶行为的影响

摘要 研究了变形退火含Nb FeCrAl合金的显微组织和力学性能。在应用热机械处理后，在 bcc-Fe 基体中观察到 Fe2Nb 型 Laves 相颗粒的精细分散，特别是沿晶粒/亚晶界，与无 Nb 的 FeCrAl 合金相比，这有效地稳定了恢复和再结晶的微观结构。随着 Nb 含量达到 1 wt%，恢复区域的稳定性增加。当在 1100 ℃以下退火时，含 Nb 的 FeCrAl 合金的再结晶晶粒结构由沿轧制方向的细长晶粒组成，具有弱织构。发现再结晶晶粒尺寸与退火温度之间存在异常关系。基于泰勒因子解释了变形和退火状态的显微结构不均匀性。退火后的含 Nb 的 FeCrAl 合金表现出良好的强度和延展性，这对于它们在轻水反应堆中作为燃料包壳的应用是理想的。