Optimization of B2/L21 hierarchical precipitate structure to improve creep resistance of a ferritic Fe-Ni-Al-Cr-Ti superalloy via thermal treatments
Optimization of B2/L21 hierarchical precipitate structure to improve creep resistance of a ferritic Fe-Ni-Al-Cr-Ti superalloy via thermal treatments
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DOI：
10.1016/j.scriptamat.2018.10.004
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发表时间：
2019-03
影响因子：
6
通讯作者：
G. Song;Soon-jik Hong;Jin Kyu Lee;S. Song;S. Hong;K. B. Kim;P. Liaw
中科院分区：
文献类型：
--
作者：
G. Song;Soon-jik Hong;Jin Kyu Lee;S. Song;S. Hong;K. B. Kim;P. Liaw
通过系统的热处理和蠕变试验，研究了B2-NiAl/L21-Ni 2 TiAl分级沉淀强化铁素体合金的沉淀相结构对沉淀相/基体界面、弹性应变和蠕变抗力的影响。实验结果表明，最高的蠕变强度是在热处理的样品中含有最大的相干沉淀物与精细的内部网络，而半相干沉淀物的结果在蠕变强度急剧下降。研究发现，强弹性应变场受沉淀物内部结构的影响，在提高抗蠕变性方面起着至关重要的作用。
The effect of precipitate structures of a B2-NiAl/L21-Ni2TiAl hierarchical precipitate-strengthened ferritic alloy on the precipitate/matrix interface, elastic strain, and creep resistance has been investigated by systematic heat-treatments and creep experiments. The experimental results reveal that the highest creep strength was achieved in a heat-treated sample containing the largest coherent precipitate with fine internal networks, whereas the semi-coherent precipitate results in a sharp drop of the creep strength. It was found that the strong elastic strain field, affected by the internal structure within the precipitate, plays a crucial role in improving the creep resistance.