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<p>The nano-scale L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates significantly contribute to thermal stability of alumina-forming austenitic (AFA) steels. The coarsening behavior of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates in AFA steels during isothermal aging with considering the influence of alloying elements was investigated. The results show that the coarsening rate of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates increases with co-additions of Ni and Cu, and especially, the increase of Cu content promotes the nucleation of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates. A dynamic competition exists between Lifshitz–Slyozov–Wagner theory and transient interface diffusion-controlled theory for coarsening behavior of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates with duration of isothermal aging. Additionally, the transition from L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates to B2-NiAl precipitates during isothermal aging results in the formation of a depleted zone of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates around B2-NiAl precipitates, which inhibits the growth of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates. The coarsening of L1<sub>2</sub>-Ni<sub>3</sub>Al precipitates significantly contributes to the yield strength of AFA steels.</p>

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Coarsening Behavior of L12-Ni3Al Precipitates in Alumina-Forming Austenitic Steel

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Shaoqiang Ren,
  • Qingshuang Ma,
  • Chengxian Zhang,
  • Liming Yu,
  • Huijun Li,
  • Hongtao Zhu,
  • Qiuzhi Gao

摘要

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.