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Secondary Recrystallization of Nickel-Base Superalloy CM 247 LC After Processing by Metal Injection Molding

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Abstract

Fabrication of parts by metal injection molding (MIM) results in very fine grain sizes. In the present investigation, heat treatments were employed to gain a larger grain size that is more creep resistant. The alloy under investigation was CM 247 LC. The composition was slightly modified to facilitate grain growth. Secondary recrystallization was observed to occur during post-sintering annealing treatments approximately 50 °C below the sintering temperature. The grain size increased from 25 µm to > 2 mm. The increase of grain size was found to improve creep strength significantly. The samples in the as-sintered condition exhibited a bimodal grain size distribution. The grain size in a thin surface zone after sintering was slightly increased because of a lower C and O content in this zone that promoted normal grain growth. Secondary recrystallization did not occur in the surface zone. This is attributed to a lack of driving force in this area.

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Acknowledgments

The authors thank Rolls-Royce Deutschland and Bundesministerium für Wirtschaft und Energie BMWi (Federal Ministry for Economic Affairs and Energy) for financial support (Funding Code 20T1312A). Some of the work was done within the framework of the LuFo project “AdCoTurb: Advanced Components for Turbines – Fortschrittliche Turbinenkomponenten.” We also acknowledge the support from Sieglinde Müller at Schunk Sintermetalltechnik GmbH in preparation of the MIM preforms. Naicheng Sheng thanks Jan P. Liebig from WW1, Friedrich-Alexander University of Erlangen-Nuremberg, for his help in grain boundary structure analysis. We thank the technical staff at WTM and ZMP, Friedrich-Alexander University of Erlangen-Nuremberg, for the help during metallography preparation, chemical analysis and machining.

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  1. Naicheng Sheng

    Present address: Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China

Authors and Affiliations

  1. Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nuremberg (FAU), Dr.-Mack-Str. 81, 90762, Fuerth, Germany

    Naicheng Sheng, Andreas Meyer, Carolin Körner & Robert F. Singer

  2. Rolls-Royce Deutschland Ltd. & Co. KG, Eschenweg 11, Dahlewitz, 15827, Blankenfelde-Mahlow, Germany

    Katharina Horke

  3. Department of Materials Science, Institute of Materials Science and Engineering for Metals (WTM), Friedrich-Alexander University of Erlangen-Nuremberg (FAU), Martensstr. 5, 91052, Erlangen, Germany

    Carolin Körner & Robert F. Singer

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  1. Naicheng Sheng
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  2. Andreas Meyer
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  3. Katharina Horke
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  5. Robert F. Singer
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Correspondence to Naicheng Sheng.

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Manuscript submitted June 17, 2020; accepted October 27, 2020.

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Sheng, N., Meyer, A., Horke, K. et al. Secondary Recrystallization of Nickel-Base Superalloy CM 247 LC After Processing by Metal Injection Molding. Metall Mater Trans A 52, 512–519 (2021). https://doi.org/10.1007/s11661-020-06087-3

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