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<p>This study investigates the grain boundary engineering of N06625 alloy through deformation heat treatment, aiming to increase the fraction of low Σ coincidence site lattice (CSL) grain boundaries and enhance crack resistance and mechanical properties. A combination of cold rolling and annealing was employed to systematically examine the synergistic effects of low ΣCSL grain boundaries and twin-related domain (TRD) formation. The results indicate that under 5% cold rolling and annealing at 1110°C, the fraction of low ΣCSL grain boundaries significantly increased, with the Σ3 boundaries reaching 64.3% and Σ9 + Σ27 boundaries at 7.99%. Meanwhile, the average TRD size expanded to 231.61, contributing to a more optimized grain boundary character distribution (GBCD). However, under higher deformation levels (15%), dynamic recrystallization suppressed the formation of low ΣCSL boundaries. These findings provide new insights into grain boundary engineering for N06625 alloy, offering a theoretical basis for improving its mechanical performance and crack resistance. This work holds great potential for high-temperature applications, particularly in the aerospace industry.</p>

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Effect of Deformation Heat Treatment Process on the Grain Boundary Character Distribution of N06625 Alloy

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Qi Chen,
  • Fang Huang,
  • Huaying Li,
  • Yaohui Song,
  • Ming Zhao,
  • Guanzheng Su

摘要

This study investigates the grain boundary engineering of N06625 alloy through deformation heat treatment, aiming to increase the fraction of low Σ coincidence site lattice (CSL) grain boundaries and enhance crack resistance and mechanical properties. A combination of cold rolling and annealing was employed to systematically examine the synergistic effects of low ΣCSL grain boundaries and twin-related domain (TRD) formation. The results indicate that under 5% cold rolling and annealing at 1110°C, the fraction of low ΣCSL grain boundaries significantly increased, with the Σ3 boundaries reaching 64.3% and Σ9 + Σ27 boundaries at 7.99%. Meanwhile, the average TRD size expanded to 231.61, contributing to a more optimized grain boundary character distribution (GBCD). However, under higher deformation levels (15%), dynamic recrystallization suppressed the formation of low ΣCSL boundaries. These findings provide new insights into grain boundary engineering for N06625 alloy, offering a theoretical basis for improving its mechanical performance and crack resistance. This work holds great potential for high-temperature applications, particularly in the aerospace industry.