Scholarlink

<p>Single-step strain-annealing thermo-mechanical treatment (TMT) reliably produced grain-boundary-engineered (GBE) microstructures in 22-mm 316LN stainless steel. Cold-worked (5–20%) and solution-annealed (1173–1273&#xa0;K, 30&#xa0;min) blanks were characterized by electron backscatter diffraction (EBSD) to assess the grain boundary character distribution. Optimized TMTs markedly increased low-Σ CSL fractions (≤ Σ29b), with Σ3 twins dominating in these variants and elevated J2/J3 triple-junction fractions that fragment continuous random high-angle boundary networks. The Σ3/(Σ9 + Σ27) ratio and triple junction statistics distinguish prolific twinning regimes from conditions where Σ3 regeneration and strain-induced boundary migration (SIBM) synergize to amplify low-Σ connectivity. Electrochemical potentiokinetic reactivation (EPR) testing before and after sensitization demonstrated improved low-Σ connectivity with a reduced degree of sensitization. The single-step strain-annealing route therefore offers an industrially scalable, time efficient option to tailor boundary networks in thick 316LN components, balancing manufacturability with enhanced intergranular corrosion resistance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessing Grain Boundary Character Distribution in Austenitic Stainless Steel Subjected to Thermo-mechanical Treatment

  • 期刊论文

  • 发表日期：

    2026年5月4日

查看全文
  • D. P. Rao Palaparti,
  • A. Poonguzhali,
  • V. D. Vijayanand,
  • K. Mariappan,
  • G. V. Prasad Reddy

摘要

Single-step strain-annealing thermo-mechanical treatment (TMT) reliably produced grain-boundary-engineered (GBE) microstructures in 22-mm 316LN stainless steel. Cold-worked (5–20%) and solution-annealed (1173–1273 K, 30 min) blanks were characterized by electron backscatter diffraction (EBSD) to assess the grain boundary character distribution. Optimized TMTs markedly increased low-Σ CSL fractions (≤ Σ29b), with Σ3 twins dominating in these variants and elevated J2/J3 triple-junction fractions that fragment continuous random high-angle boundary networks. The Σ3/(Σ9 + Σ27) ratio and triple junction statistics distinguish prolific twinning regimes from conditions where Σ3 regeneration and strain-induced boundary migration (SIBM) synergize to amplify low-Σ connectivity. Electrochemical potentiokinetic reactivation (EPR) testing before and after sensitization demonstrated improved low-Σ connectivity with a reduced degree of sensitization. The single-step strain-annealing route therefore offers an industrially scalable, time efficient option to tailor boundary networks in thick 316LN components, balancing manufacturability with enhanced intergranular corrosion resistance.