Scholarlink

<p>Controlling shrinkage porosity and microstructural inhomogeneity in complex Ni-based superalloy castings remains challenging. This study proposes a shrinkage control model via Casting module simplification, quantifying the effects of pouring temperature, shell mold temperature, and pouring rate. The results indicate that increasing the pouring temperature from 1500 to 1550&#xa0;°C reduced the shrinkage porosity volume by 3.08&#xa0;cm<sup>3</sup> (0.097%), while raising the shell mold temperature by 50&#xa0;°C suppressed this defect volume by 2.10 cm<sup>3</sup> (0.055%). A prioritized strategy was established: first increase the pouring temperature, which offers a volume reduction of 0.62&#xa0;cm<sup>3</sup> per 10&#xa0;°C, and then the shell mold temperature, which provides a reduction of 0.42 cm<sup>3</sup> per 10&#xa0;°C. Under optimized parameters (1550&#xa0;°C, 900&#xa0;°C, 5.2&#xa0;kg/s), shrinkage volume decreases from 15.54&#xa0;cm<sup>3</sup> to 2.13&#xa0;cm<sup>3</sup>, validated by experimental casting. The as-cast microstructure comprises γ matrix and MC carbides, coarsening dendritic γ and transforming MC from fine particles to coarse lamellae at grain boundaries under slower cooling rates.</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

Shrinkage Porosity and Microstructure Control via Casting-Module-Driven Optimization in Ni-based Superalloy Castings

  • 期刊论文

  • 发表日期：

    2026年3月16日

查看全文
  • Zhaohui Hu,
  • Shu Wang,
  • Ruirun Chen,
  • Xiaofu Zhang,
  • Shi Cheng,
  • Hao Tian,
  • Qiuju Zhu,
  • Xiaoming Wang,
  • Yalong Gao,
  • Jingjie Guo

摘要

Controlling shrinkage porosity and microstructural inhomogeneity in complex Ni-based superalloy castings remains challenging. This study proposes a shrinkage control model via Casting module simplification, quantifying the effects of pouring temperature, shell mold temperature, and pouring rate. The results indicate that increasing the pouring temperature from 1500 to 1550 °C reduced the shrinkage porosity volume by 3.08 cm3 (0.097%), while raising the shell mold temperature by 50 °C suppressed this defect volume by 2.10 cm3 (0.055%). A prioritized strategy was established: first increase the pouring temperature, which offers a volume reduction of 0.62 cm3 per 10 °C, and then the shell mold temperature, which provides a reduction of 0.42 cm3 per 10 °C. Under optimized parameters (1550 °C, 900 °C, 5.2 kg/s), shrinkage volume decreases from 15.54 cm3 to 2.13 cm3, validated by experimental casting. The as-cast microstructure comprises γ matrix and MC carbides, coarsening dendritic γ and transforming MC from fine particles to coarse lamellae at grain boundaries under slower cooling rates.