Effects of Laves phase particles on recovery and recrystallization behaviors of Nb-containing FeCrAl alloys
Effects of Laves phase particles on recovery and recrystallization behaviors of Nb-containing FeCrAl alloys
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DOI：
10.1016/j.actamat.2017.11.027
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发表时间：
2018-02
期刊：
影响因子：
9.4
通讯作者：
Z. Sun;P. Edmondson;Y. Yamamoto
中科院分区：
文献类型：
--
作者：
Z. Sun;P. Edmondson;Y. Yamamoto
研究了含Nb的FeCrAl合金变形前后的组织和力学性能。经形变处理后，Fe2Nb型Laves相颗粒在bcc-Fe基合金中弥散分布，尤其是沿晶界，与无Nb的FeCrAl合金相比，有效地稳定了回复组织和再结晶组织。当Nb含量达到1wt%时，恢复区的稳定性增加。含Nb的FeCrAl合金在1100℃以下退火时，再结晶组织由沿轧制方向长大的晶粒组成，织构较弱，再结晶晶粒尺寸与退火温度之间存在反常关系。用泰勒因子解释了形变态和退火态的组织不均匀性。退火后的含Nb FeCrAl合金具有良好的强度和塑性，是轻水反应堆燃料包壳的理想材料。
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.