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<p>Enhancing homogenization efficiency and hot-workability is the key issue for wrought superalloys in the industry. A novel approach for simultaneous accelerating the homogenization kinetics and improving hot-workability via a simple way of prior hot-deformation was proposed, which was not widely accepted for wrought superalloys. The homogenization efficiency is increased by 40%–70% via performing 10%–20% prior hot-deformation. Both theoretical and experimental analyses revealed that the increment in homogenization efficiency is mainly attributed to the decrease in interdendritic-segregation spacing, and thus the necessary diffusion distance, rather than that of dislocations. In addition, dynamic and static recrystallizations occurred during the prior hot-deformation and diffusion-annealing processes, and the grains were significantly refined even after the homogenization. Furthermore, the size of the precipitates was refined as well. These enhanced the hot-workability of the homogenized ingot for the subsequent cogging process.</p>

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Accelerating homogenization kinetics and enhancing hot-workability of as-cast nickel-based superalloy via prior hot-deformation

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Jia-jun Chen,
  • Yang Zhou,
  • Hao-ran Han,
  • Xian-guang Zhang,
  • Goro Miyamoto,
  • Ping-mei Tang,
  • Dong-ping Xiao,
  • Jian-hui Fu,
  • Peng Shi,
  • Yi-wu Pei,
  • Jian Zhang

摘要

Enhancing homogenization efficiency and hot-workability is the key issue for wrought superalloys in the industry. A novel approach for simultaneous accelerating the homogenization kinetics and improving hot-workability via a simple way of prior hot-deformation was proposed, which was not widely accepted for wrought superalloys. The homogenization efficiency is increased by 40%–70% via performing 10%–20% prior hot-deformation. Both theoretical and experimental analyses revealed that the increment in homogenization efficiency is mainly attributed to the decrease in interdendritic-segregation spacing, and thus the necessary diffusion distance, rather than that of dislocations. In addition, dynamic and static recrystallizations occurred during the prior hot-deformation and diffusion-annealing processes, and the grains were significantly refined even after the homogenization. Furthermore, the size of the precipitates was refined as well. These enhanced the hot-workability of the homogenized ingot for the subsequent cogging process.