Scholarlink

<p>The feasibility of producing N4 pure nickel strip via twin-roll strip casting (TRSC) was firstly investigated in this study. The results showed that the as-cast strip obtained by TRSC predominantly exhibited the columnar grain structure with an average grain size of 208.1&#xa0;<i>μ</i>m, which is significantly refined compared with the millimeter-scale grains typically observed in conventionally ingot cast. Annealing of the cold-rolled TRSC strip resulted in a slightly coarser recrystallized grain structure than that of the cold-rolled CHR strip, because the cold-rolled TRSC strip inherited the coarse columnar grain structure formed during solidification, which reduced the effective density of recrystallization nucleation sites. However, the annealed TRSC strip exhibited the tensile strength comparable to that of the annealed CHR strip. After the annealing at 850&#xa0;°C for 5 minutes, a favorable strength-ductility balance was achieved in the TRSC strip, with the ultimate tensile strength of 403.9&#xa0;MPa and the total elongation of 45.5&#xa0;pct, fully satisfying the national standards for N4 pure nickel strip. EBSD analysis revealed that both strips annealed at 850 °C for 5&#xa0;minutes underwent complete recrystallization, while the annealed TRSC strip developed a higher fraction of Σ3 annealing twin boundaries than the annealed CHR strip. Estimation using the Hall–Petch relationship indicates that the difference in strengthening due to grain size between the two processes is minor. Additionally, a higher Σ3 boundary fraction in the annealed TRSC strip increased the effective density of dislocation obstacles. As a result, the comparable strength–ductility balance was achieved in the annealed TRSC strip compared with the annealed CHR strip.</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

Exploration on Twin-Roll Strip Casting to Efficiently Produce N4 Pure Nickel Strip with Favorable Strength-Ductility Balance

  • 期刊论文

  • 发表日期：

    2026年3月6日

查看全文
  • Ligang Liu,
  • Xueying Lyu,
  • Hui Xu,
  • Lankun Wang,
  • Jun Cao,
  • Wanlin Wang,
  • Peisheng Lyu

摘要

The feasibility of producing N4 pure nickel strip via twin-roll strip casting (TRSC) was firstly investigated in this study. The results showed that the as-cast strip obtained by TRSC predominantly exhibited the columnar grain structure with an average grain size of 208.1 μm, which is significantly refined compared with the millimeter-scale grains typically observed in conventionally ingot cast. Annealing of the cold-rolled TRSC strip resulted in a slightly coarser recrystallized grain structure than that of the cold-rolled CHR strip, because the cold-rolled TRSC strip inherited the coarse columnar grain structure formed during solidification, which reduced the effective density of recrystallization nucleation sites. However, the annealed TRSC strip exhibited the tensile strength comparable to that of the annealed CHR strip. After the annealing at 850 °C for 5 minutes, a favorable strength-ductility balance was achieved in the TRSC strip, with the ultimate tensile strength of 403.9 MPa and the total elongation of 45.5 pct, fully satisfying the national standards for N4 pure nickel strip. EBSD analysis revealed that both strips annealed at 850 °C for 5 minutes underwent complete recrystallization, while the annealed TRSC strip developed a higher fraction of Σ3 annealing twin boundaries than the annealed CHR strip. Estimation using the Hall–Petch relationship indicates that the difference in strengthening due to grain size between the two processes is minor. Additionally, a higher Σ3 boundary fraction in the annealed TRSC strip increased the effective density of dislocation obstacles. As a result, the comparable strength–ductility balance was achieved in the annealed TRSC strip compared with the annealed CHR strip.