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<p>Single-crystal superalloy blades serving in high-temperature environments are prone to recrystallization induced by surface damage. This study investigates the recrystallization behavior and suppression methods of IC21 alloy under different surface treatments. Results indicate that stored deformation energy from surface damage is the fundamental driving force for recrystallization, and the broadening trend of full width at half maximum correlates positively with increased recrystallized depth. Morphology is primarily influenced by γ′ phase distribution. Fine γ′ phases in the solution-treated state impede grain boundary migration, forming a cellular structure, whereas coarsened γ′ phases in the aged state lead to a coarse grained structure. Although recrystallized layers are weak regions during deformation and tends to induce cracks, the matrix effectively inhibits crack propagation through tip blunting and deflection mechanisms, leading to about 3% reduction in the high-temperature tensile strength. The elimination of recrystallization by recovery treatment is hindered by a synergistic mechanism. This mechanism involves dense γ/γ' interfacial obstacles, sluggish diffusion and solute drag from refractory elements, and restricted cross-slip caused by low stacking fault energy. Restoration treatment at high temperatures induces abnormal grain growth through surface Al depletion and γ′ phase dissolution.</p>

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Study on the Recrystallization Behavior and Inhibition of a Ni3Al-Based Single-Crystal Superalloy

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Liwu Jiang,
  • Dongxu Kou,
  • Xu Wang,
  • Xintian Wang

摘要

Single-crystal superalloy blades serving in high-temperature environments are prone to recrystallization induced by surface damage. This study investigates the recrystallization behavior and suppression methods of IC21 alloy under different surface treatments. Results indicate that stored deformation energy from surface damage is the fundamental driving force for recrystallization, and the broadening trend of full width at half maximum correlates positively with increased recrystallized depth. Morphology is primarily influenced by γ′ phase distribution. Fine γ′ phases in the solution-treated state impede grain boundary migration, forming a cellular structure, whereas coarsened γ′ phases in the aged state lead to a coarse grained structure. Although recrystallized layers are weak regions during deformation and tends to induce cracks, the matrix effectively inhibits crack propagation through tip blunting and deflection mechanisms, leading to about 3% reduction in the high-temperature tensile strength. The elimination of recrystallization by recovery treatment is hindered by a synergistic mechanism. This mechanism involves dense γ/γ' interfacial obstacles, sluggish diffusion and solute drag from refractory elements, and restricted cross-slip caused by low stacking fault energy. Restoration treatment at high temperatures induces abnormal grain growth through surface Al depletion and γ′ phase dissolution.