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<p>High strain rate incremental deformation paths were applied at various temperatures and for different initial microstructural states through hot compression experiments on the <i>γ</i>–<i>γ</i>′ nickel-based superalloy René 65, simulating the hot ring-rolling deformation process. For identical final strain level, strain rate, deformation temperature, incremental deformation time and initial microstructural state, it was observed that a lower final recrystallization level is obtained for a higher number of increments. Flow stress and thermal analysis showed that the effective deformation temperature is affected by self-heating, leading to higher effective temperature for lower number of increments and so promoting recrystallization. Intragranular <i>γ</i>′ precipitation analyses exhibited a coarsening effect for the condition showing higher final recrystallization level. For further understanding, incremental deformations were interrupted before and after specific dwell times, assessing the effect of post-dynamic evolution on the final recrystallized level. Finally, the interaction between recrystallization and <i>γ</i>′ precipitation was studied in the case of an incremental deformation. It revealed that the alternation of deformation increments and dwell times emphasizes the dampening effect of intragranular <i>γ</i>′ on recrystallization evolution.</p>

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Influence of the Number of Increments on Recrystallization for a Typical Ring-Rolling Deformation

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Théo Huyghe,
  • Malik Durand,
  • Eric Georges,
  • Daniel Pino Muñoz,
  • Julien de Jaeger,
  • Christian Dumont,
  • Marc Bernacki,
  • Nathalie Bozzolo

摘要

High strain rate incremental deformation paths were applied at various temperatures and for different initial microstructural states through hot compression experiments on the γ–γ′ nickel-based superalloy René 65, simulating the hot ring-rolling deformation process. For identical final strain level, strain rate, deformation temperature, incremental deformation time and initial microstructural state, it was observed that a lower final recrystallization level is obtained for a higher number of increments. Flow stress and thermal analysis showed that the effective deformation temperature is affected by self-heating, leading to higher effective temperature for lower number of increments and so promoting recrystallization. Intragranular γ′ precipitation analyses exhibited a coarsening effect for the condition showing higher final recrystallization level. For further understanding, incremental deformations were interrupted before and after specific dwell times, assessing the effect of post-dynamic evolution on the final recrystallized level. Finally, the interaction between recrystallization and γ′ precipitation was studied in the case of an incremental deformation. It revealed that the alternation of deformation increments and dwell times emphasizes the dampening effect of intragranular γ′ on recrystallization evolution.