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Effect of B, Zr, and C on Hot Tearing of a Directionally Solidified Nickel-Based Superalloy

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Abstract

The effect of the minor elements B, Zr, and C on the castability of a Nickel-based γ′-strengthened superalloy has been investigated. Tube-like specimens were prepared by directional solidification where the rigid ceramic core leads to hoop stresses and grain boundary cracking. It was found that an important improvement in castability can be achieved by adjusting the minor elemental composition. Too low C (≤0.15 pct) and too high B and Zr contents (≥0.05 pct) lead to material that is very prone to solidification cracking and should be avoided. The results cannot be rationalized on the basis of the current models for solidification cracking. Instead, pronounced hot tearing is observed to occur at high amounts of γ/γ′-eutectic and high Zr contents. The critical film stage where dendrites at the end of solidification do not touch and are separated by thin liquid films must be avoided. How Zr promotes the film stage will be discussed in the paper.

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Acknowledgments

This project was partly funded by the Bavarian State Ministry of Education, Science and Arts, and the Bavarian State Ministry of Economics, Infrastructure, Traffic and Technology within the KW21 research framework and was undertaken in collaboration with MTU Aero Engines Munich, Germany. The project was also partly funded by the German Science Foundation Collaborative Research Centre SFB/Transregio 103, project B1. This support is gratefully acknowledged.

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Authors and Affiliations

  1. WTM Institute, University of Erlangen-Nuremberg, Martensstr. 5, 91058, Erlangen, Germany

    J. Grodzki (Research Associate, Development Engineer)

  2. Siemens AG, Huttenstr. 12, 10553, Berlin, Germany

    J. Grodzki (Research Associate, Development Engineer)

  3. WTM Institute, Department of Materials Science, University of Erlangen-Nuremberg, 91058, Erlangen, Germany

    N. Hartmann (Post Graduate Student), R. Rettig (Research Associate) & R. F. Singer (Professor, Director)

  4. MTU Aero Engines AG, 80995, Munich, Germany

    E. Affeldt (Industrial Advisor and Contracting Body)

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  1. J. Grodzki
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  3. R. Rettig
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  5. R. F. Singer
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Correspondence to J. Grodzki.

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Manuscript submitted September 11, 2015.

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Grodzki, J., Hartmann, N., Rettig, R. et al. Effect of B, Zr, and C on Hot Tearing of a Directionally Solidified Nickel-Based Superalloy. Metall Mater Trans A 47, 2914–2926 (2016). https://doi.org/10.1007/s11661-016-3416-8

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