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<p>The precise acquisition of the interface heat transfer coefficient (IHTC) for temperature field of nickel-based superalloy turbine blades is of technological importance but remains a challenging task. In this work, we presented an approach to obtain the thermal conductivity of ZrSiO<sub>4</sub> ceramic shells (25–1500&#xa0;°C) by combining hot disk testing and extrapolation methods and developed a dynamic IHTC model via the finite difference method (FDM) integrated with thermocouple measurement data from the directional solidification (DS) process. The thermal conductivity of ZrSiO<sub>4</sub> shells decreases initially and then increases with temperature rises, while the IHTC decreases from 550 to 480 W/(m<sup>2</sup>&#xa0;K) during solidification. ProCAST simulations incorporating the optimized IHTC show good agreement with experimental data (<i>R</i><sup>2 </sup>= 0.9405), providing a reliable approach for the acquisition of IHTC and the quality control of superalloy castings.</p>

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Optimization for Accurate Acquisition of Interface Heat Transfer Coefficient in Directional Solidification of Nickel-Based Superalloy

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Longpei Dong,
  • Yilin Li,
  • Jiayi Sun,
  • Jingjing Liu,
  • Hui Xu,
  • Yushi Luo,
  • Yunsong Zhao,
  • Feiyu Zhang,
  • Zhentao Wang,
  • Enhui Wang,
  • Xinmei Hou

摘要

The precise acquisition of the interface heat transfer coefficient (IHTC) for temperature field of nickel-based superalloy turbine blades is of technological importance but remains a challenging task. In this work, we presented an approach to obtain the thermal conductivity of ZrSiO4 ceramic shells (25–1500 °C) by combining hot disk testing and extrapolation methods and developed a dynamic IHTC model via the finite difference method (FDM) integrated with thermocouple measurement data from the directional solidification (DS) process. The thermal conductivity of ZrSiO4 shells decreases initially and then increases with temperature rises, while the IHTC decreases from 550 to 480 W/(m2 K) during solidification. ProCAST simulations incorporating the optimized IHTC show good agreement with experimental data (R2 = 0.9405), providing a reliable approach for the acquisition of IHTC and the quality control of superalloy castings.