Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold

Liu, Zhefeng; Miao, Kai; Lian, Weibo; Lu, Zhongliang; Li, Dichen

doi:10.3390/met12111832

Open AccessArticle

Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold

by

Zhefeng Liu

^†,

Kai Miao

^†,

Weibo Lian

,

Zhongliang Lu

^* and

Dichen Li

^*

State Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

^*

Authors to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Metals 2022, 12(11), 1832; https://doi.org/10.3390/met12111832

Submission received: 5 September 2022 / Revised: 1 October 2022 / Accepted: 24 October 2022 / Published: 28 October 2022

(This article belongs to the Special Issue Modeling and Simulation of Solidification in Alloys)

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Abstract

The stray grain defect is often found at the platform in the process of directional solidification of single crystal blades because local undercooling easily occurs in this area. A variable wall thickness mold based on stereolithography and gelcasting technology was proposed to solve the local undercooling at the platform. The influence of variable wall thickness mold on the temperature field of the platform during directional solidification was studied via simulation. The numerical simulation results show that variable wall thickness can effectively prevent heat dissipation at the platform, thereby reducing the undercooling and avoiding the formation of stray grains. At the same time, the influence of molds assembly angle on the formation of stray grains was analyzed, and the appropriate molds assembly angle is suggested.

Keywords: single crystal; directional solidification; stray grains; numerical simulation; variable wall thickness

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MDPI and ACS Style

Liu, Z.; Miao, K.; Lian, W.; Lu, Z.; Li, D. Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold. Metals 2022, 12, 1832. https://doi.org/10.3390/met12111832

AMA Style

Liu Z, Miao K, Lian W, Lu Z, Li D. Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold. Metals. 2022; 12(11):1832. https://doi.org/10.3390/met12111832

Chicago/Turabian Style

Liu, Zhefeng, Kai Miao, Weibo Lian, Zhongliang Lu, and Dichen Li. 2022. "Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold" Metals 12, no. 11: 1832. https://doi.org/10.3390/met12111832

APA Style

Liu, Z., Miao, K., Lian, W., Lu, Z., & Li, D. (2022). Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold. Metals, 12(11), 1832. https://doi.org/10.3390/met12111832

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Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold

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