Optimization of B2/L21 hierarchical precipitate structure to improve c…
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논문명 | 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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저자 | Gian Song, Soon Jik Hong, Jin Kyu Lee, Sung Ho Song, Sung Hwan Hong, Ki Buem Kim, Peter K Liaw |
저널명 | Scripta Materialia |
게재년월 | 2019/3/1 |
Vol. pp | 161권 페이지 18-22 |
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.