Scholarlink

<p>The current study is conducted to reveal the influence of Al/Ti ratio on the solidification characteristics, microsegregation of alloying elements, and eutectic precipitates in 15Cr–30Ni heat-resistant alloy produced by electroslag remelting (ESR). An increase in the Al/Ti ratio enhances the microsegregation degrees of Ti and Si, whereas suppresses microsegregation degrees of Nb and Mo during solidification of 15Cr–30Ni alloy. The increase in the Al/Ti ratio of the alloy promotes the precipitation of eutectic Laves phase and (Ti,Nb)C in terms of their size distribution, number proportion, and area fraction. A model for predicting microsegregation of alloying elements considering non-equilibrium parameters, constitutional undercooling, back-diffusion in the solid phase, and dendritic remelting was developed. The proposed modified Won–Thomas model reaches much higher prediction accuracy than Scheil–Gulliver, Clyne–Kurz, and Won–Thomas models. The average differences between the predicted microsegregation degrees of Ti, Nb, Si, and Mo by the modified Won–Thomas model and the measured results by EPMA are 7.9, 18.3, 9.0, and 4.7&#xa0;pct, respectively. The relative contributions of constitutional undercooling, back-diffusion, and dendritic remelting to the microsegregation during the solidification of liquid alloy were quantitatively analyzed. The modified Won–Thomas model shows significant advantages by combining analytical rigor with straightforward implementation. The present study provides valuable insights for optimizing processing parameters of ESR and establishing appropriate homogenization treatment strategies for the as-cast ESR ingots.</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

Effect of Al/Ti Ratio on Microsegregation and Eutectic Precipitates in Electroslag Remelted 15Cr–30Ni–Fe Heat-Resistant Alloy

  • 期刊论文

  • 发表日期：

    2026年1月26日

查看全文
  • Huai Zhang,
  • Chengbin Shi,
  • Hui Wang,
  • Peng Ren

摘要

The current study is conducted to reveal the influence of Al/Ti ratio on the solidification characteristics, microsegregation of alloying elements, and eutectic precipitates in 15Cr–30Ni heat-resistant alloy produced by electroslag remelting (ESR). An increase in the Al/Ti ratio enhances the microsegregation degrees of Ti and Si, whereas suppresses microsegregation degrees of Nb and Mo during solidification of 15Cr–30Ni alloy. The increase in the Al/Ti ratio of the alloy promotes the precipitation of eutectic Laves phase and (Ti,Nb)C in terms of their size distribution, number proportion, and area fraction. A model for predicting microsegregation of alloying elements considering non-equilibrium parameters, constitutional undercooling, back-diffusion in the solid phase, and dendritic remelting was developed. The proposed modified Won–Thomas model reaches much higher prediction accuracy than Scheil–Gulliver, Clyne–Kurz, and Won–Thomas models. The average differences between the predicted microsegregation degrees of Ti, Nb, Si, and Mo by the modified Won–Thomas model and the measured results by EPMA are 7.9, 18.3, 9.0, and 4.7 pct, respectively. The relative contributions of constitutional undercooling, back-diffusion, and dendritic remelting to the microsegregation during the solidification of liquid alloy were quantitatively analyzed. The modified Won–Thomas model shows significant advantages by combining analytical rigor with straightforward implementation. The present study provides valuable insights for optimizing processing parameters of ESR and establishing appropriate homogenization treatment strategies for the as-cast ESR ingots.