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Formation mechanism and coarsening behavior of fan-type structures in a new Ni–Cr–Co-based powder metallurgy superalloy

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Abstract

The formation mechanism and coarsening behavior of fan-type structures in a new Ni–Cr–Co-based powder metallurgy superalloy were investigated by means of field scanning electron microscope, transmission electron microscope, electron backscattered diffraction, and differential scanning calorimetry. The results show that the fan-type structures consist of finger-shaped γ′ dendrites and γ matrix between them. They nucleate in the chemical segregation regions on grain boundaries and grow by diffusion. There are three types of solute atoms flow: (a) rapid diffusion along grain boundary; (b) the diffusion from supersaturated γ matrix to fan-type γ′ phases; and (c) short-distance diffusion from the previous formed γ′ phases at high temperature to γ′ phases formed at low temperature within the branches of fan-type structures. These γ′ dendrites are perpendicular to grain boundaries and grow asymmetrically, resulting in grain boundary serration. In addition, the fan-type structures coarsen within the γ′ depletion zone after the standard aging treatment.

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References

  1. Larson JM, Volin TE, Larson FG (1977) Micro Sci 5:209

    CAS  Google Scholar 

  2. Furrer DU (1999) Scripta Mater 40:1215

    Article  CAS  Google Scholar 

  3. Furrer DU (2007) Proceeding of the eleventh international symposium on advanced superalloys-production and application CSM:192

  4. Mitchell RJ, Li HY, Huang ZW (2009) J Mate Process Tech 209:1011

    Article  CAS  Google Scholar 

  5. Lu XD, Deng Q, Du JH, Qu JL, Zhuang JY, Zhong ZY (2009) J Alloy Compd 477:100

    Article  CAS  Google Scholar 

  6. Lu XD, Du JH, Deng Q, Zhong ZY (2009) J Alloy Compd 486:195

    Article  CAS  Google Scholar 

  7. Huang SC, Chang KM (1984) J Mater Sci 19:1220. doi:10.1007/BF01120032

    Article  CAS  Google Scholar 

  8. Dwarapureddy AK, Balikci E, Ibekwe S, Raman A (2008) J Mater Sci 43:1802. doi:10.1007/s10853-007-2342-y

    Article  CAS  Google Scholar 

  9. Lemsky J (2004) Assessment of NASA dual microstructure heat treatment method for multiple forging batch heat treatments. NASA-CR-212950, NASA. Glenn Research Center, Cleveland

  10. Gabb TP, Gayda J (2005) Forging of advanced disk alloy LSHR. NASA-TM-213649, NASA. Glenn Research Center, Cleveland

  11. Wu K, Liu GQ, Hu BF, Wu H, Zhang YW, Tao Y, Liu JT (2009) J Univ Sci Tech B 31:719 (in Chinese)

    CAS  Google Scholar 

  12. Morinaga M, Yukawa N, Adachi H (1984) J Phys Soc Jpn 53:653

    Article  CAS  Google Scholar 

  13. Yukama N, Morinaga M, Murata Y, Ezaki H, Inouet S (1988) Superalloys, vol 225. TMS, Warrendale, pp 765–774

  14. TTNI8 (2009) Thermotech Ni-based superalloys database Version 8.0”, ThermoTech, www.thermocalc.com

  15. ASTM Standard E112, 2004e2 (2004) Standard test methods for determining average grain size. ASTM International, West Conshohocken. doi:10.1520/E0112-96R04E02. www.astm.org

  16. Staron P, Kampmann R (2000) Acta Mater 48:701

    Article  CAS  Google Scholar 

  17. Staron P, Kampmann R (2000) Acta Mater 48:713

    Article  CAS  Google Scholar 

  18. Assadi H, Schroers J (2002) Acta Mater 50:89

    Article  CAS  Google Scholar 

  19. Ricks RA, Porter AJ, Ecob RC (1983) Acta Metall 31:43

    Article  CAS  Google Scholar 

  20. Henry MF, Yoo YS, Yoon DY, Choi J (1993) Metall Trans A 24:1733

    Article  Google Scholar 

  21. Zhang JH, Yao XD, Zhang ZY, Li YA, Guan HR, Hu ZQ (1994) Acta Metall Sin 30:453 (in Chinese)

    Google Scholar 

  22. Yoo YS (2005) Scripta Mater 53:81

    Article  CAS  Google Scholar 

Download references

Acknowledgement

This study was financially supported by National Pre-research Funds and High Technology Research and Development Program of China (No. 2007AA03A223).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    K. Wu, G. Q. Liu & B. F. Hu

  2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    G. Q. Liu

  3. Department of Materials Science and Metallurgy, University of Cambridge, Cambridgeshire, CB 3QZ, UK

    F. Li

  4. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Y. W. Zhang

  5. High Temperature Materials Research Institution, CISRI, Beijing, 100081, China

    Y. W. Zhang, Y. Tao & J. T. Liu

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  1. K. Wu
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  4. F. Li
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  7. J. T. Liu
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Correspondence to K. Wu.

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Wu, K., Liu, G.Q., Hu, B.F. et al. Formation mechanism and coarsening behavior of fan-type structures in a new Ni–Cr–Co-based powder metallurgy superalloy. J Mater Sci 47, 4680–4688 (2012). https://doi.org/10.1007/s10853-012-6336-z

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  • DOI: https://doi.org/10.1007/s10853-012-6336-z

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