Scholarlink

<p>Aiming at the directional solidification process of vacuum arc remelting, a three-dimensional VAR model coupling heat transfer, fluid flow, solidification, nucleation and grain growth were established based on CAFE model and C language. The model was used to simulate the grain growth during solidification, and the effects of melting rate and cooling intensity on the solidification structure were discussed. The results show that the solidification structure is mainly composed of columnar crystals. The height and growth angle of the triangular columnar crystals at the bottom calculated by simulation are 320&#xa0;mm and 59.4°, respectively. The measured values are 310&#xa0;mm and 58.6°. The numerical simulation results are in good agreement with the experimental results in terms of grain structure, columnar dendrite growth direction. In addition, the increase of melting rate will shorten the growth time of columnar dendrites and increase the equiaxed crystal rate. The average grain size and the proportion of columnar crystals increase with the increase of cooling intensity. The research results provide a theoretical basis for the optimization of vacuum arc remelting technology.</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

Study on Solidification Structure of Ti6Al4V Alloy Ingot by Vacuum Arc Melting: Cellular Automation and Finite Element Method

  • 期刊论文

  • 发表日期：

    2025年12月1日

查看全文
  • Xia Yong,
  • Liu Xianghong,
  • Zhao Xiaohua,
  • Shang Jinjin,
  • Shi Puying,
  • Wang Yangyang,
  • He Tao,
  • Zhao Ning,
  • Wang Kaixuan,
  • Du Yuxuan

摘要

Aiming at the directional solidification process of vacuum arc remelting, a three-dimensional VAR model coupling heat transfer, fluid flow, solidification, nucleation and grain growth were established based on CAFE model and C language. The model was used to simulate the grain growth during solidification, and the effects of melting rate and cooling intensity on the solidification structure were discussed. The results show that the solidification structure is mainly composed of columnar crystals. The height and growth angle of the triangular columnar crystals at the bottom calculated by simulation are 320 mm and 59.4°, respectively. The measured values are 310 mm and 58.6°. The numerical simulation results are in good agreement with the experimental results in terms of grain structure, columnar dendrite growth direction. In addition, the increase of melting rate will shorten the growth time of columnar dendrites and increase the equiaxed crystal rate. The average grain size and the proportion of columnar crystals increase with the increase of cooling intensity. The research results provide a theoretical basis for the optimization of vacuum arc remelting technology.