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Effects of Permanent Magnetic Stirring on the Solidification Nucleation Behavior of GH4742 Superalloy

  • Advances in Grain Refinement during Solidification
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Abstract

Permanent magnetic stirring (PMS) was applied during the solidification of GH4742 superalloy for preventing hot cracking through grain refining, and the solidification nucleation behavior under different rotation speeds was studied by both experimental investigation and numerical simulation. The results show that the equiaxed zone is enlarged, and equiaxed grains are remarkably refined by PMS. However, the grain-refining degree has little change with the rotation speed increases from 100 rpm to 300 rpm. The forced flow of GH4742 metal melt is produced by PMS, and it increases with increasing rotation speed. The grain refining mainly depends on the multiplication of solidified nuclei by the forced melt flow which promotes the nuclei separation from the mold wall at the solidification nucleation stage. However, the nuclei number shows no significant difference with increasing rotation speed because of two opposite effects of forced melt flow on the nuclei separation behavior. The minimum separation length of nucleus from the mold wall is decreased with increasing rotation speed, which promotes the nuclei separation. Meanwhile, the combination of atoms to nucleus is reduced, which inhibits the nuclei separation. This mechanism offers new insights into the effects of PMS on the solidification of superalloys.

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Acknowledgements

This research was financially supported by the Major Projects in Aviation Engines and Gas Turbines of China (Grant No. J2019-VI-0020-0136) and the National Key Research and Development Program of China (Grant No. 2022YFB3705102).

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Authors and Affiliations

  1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Jiahui Wang, Lei Wang, Xiu Song & Yang Liu

  2. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China

    Haitao Zhang & Jing Zou

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  1. Jiahui Wang
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Wang, J., Wang, L., Song, X. et al. Effects of Permanent Magnetic Stirring on the Solidification Nucleation Behavior of GH4742 Superalloy. JOM 75, 2818–2827 (2023). https://doi.org/10.1007/s11837-023-05740-7

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  • DOI: https://doi.org/10.1007/s11837-023-05740-7

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