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Coarsening Behavior of L12-Ni3Al Precipitates in Alumina-Forming Austenitic Steel
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DOI：10.1007/s40195-025-01915-0.png)
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Abstract
En 中文
The nano-scale L12-Ni3Al precipitates significantly contribute to thermal stability of alumina-forming austenitic (AFA) steels. The coarsening behavior of L12-Ni3Al precipitates in AFA steels during isothermal aging with considering the influence of alloying elements was investigated. The results show that the coarsening rate of L12-Ni3Al precipitates increases with co-additions of Ni and Cu, and especially, the increase of Cu content promotes the nucleation of L12-Ni3Al precipitates. A dynamic competition exists between Lifshitz–Slyozov–Wagner theory and transient interface diffusion-controlled theory for coarsening behavior of L12-Ni3Al precipitates with duration of isothermal aging. Additionally, the transition from L12-Ni3Al precipitates to B2-NiAl precipitates during isothermal aging results in the formation of a depleted zone of L12-Ni3Al precipitates around B2-NiAl precipitates, which inhibits the growth of L12-Ni3Al precipitates. The coarsening of L12-Ni3Al precipitates significantly contributes to the yield strength of AFA steels.
Keywords:
Alumina-forming austenitic steel
Isothermal aging
Coarsening behavior
L1 2 -Ni 3 Al precipitates
B2-NiAl precipitates
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