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<p>This study used commercial 321 stainless steel plates as raw materials and subjected them to Grain boundary engineering (GBE) treatment. It was observed that the length proportion of low Σ value coincidence site lattice boundaries (Σ3 + Σ9 + Σ27) increased from 39.3% before GBE treatment to 75.9% after GBE treatment, with the proportion of coherent Σ3 boundaries rising from 26.2% to 58.1%. Creep tests were conducted on samples without titanium stabilization treatment under various stress conditions at 550°C. The results indicated that the high-temperature creep life of the material improved by more than 70% following GBE treatment. Electron backscatter diffraction and nano-indentation analysis showed that the creep stress concentration at coherent twin boundaries (CTBs) is lower than that at random grain boundaries, reducing the likelihood of creep voids or cracks forming at CTBs. Furthermore, CTBs have a suppressive effect on the propagation of grain boundary cracks. The results of this study are significant for advancing our understanding of the role of CTBs in the high-temperature creep deformation of face-centered cubic metals without precipitated phases.</p>

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Effect of Coherent Twin Boundary on High Temperature Creep Property of 321SS Without Titanium Stabilization Treatment

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Gang Xu,
  • Xiao Cheng,
  • Jiexin Wu,
  • Weiguo Wang,
  • Zhen Wang,
  • Song Chen

摘要

This study used commercial 321 stainless steel plates as raw materials and subjected them to Grain boundary engineering (GBE) treatment. It was observed that the length proportion of low Σ value coincidence site lattice boundaries (Σ3 + Σ9 + Σ27) increased from 39.3% before GBE treatment to 75.9% after GBE treatment, with the proportion of coherent Σ3 boundaries rising from 26.2% to 58.1%. Creep tests were conducted on samples without titanium stabilization treatment under various stress conditions at 550°C. The results indicated that the high-temperature creep life of the material improved by more than 70% following GBE treatment. Electron backscatter diffraction and nano-indentation analysis showed that the creep stress concentration at coherent twin boundaries (CTBs) is lower than that at random grain boundaries, reducing the likelihood of creep voids or cracks forming at CTBs. Furthermore, CTBs have a suppressive effect on the propagation of grain boundary cracks. The results of this study are significant for advancing our understanding of the role of CTBs in the high-temperature creep deformation of face-centered cubic metals without precipitated phases.