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Retardation of σ-phase transformation in modified superalloy RR2072

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Abstract

A comparative investigation of σ-phase transformation in base and modified experimental alloy RR2072 (C, Hf, and B) has been undertaken. The alloys were exposed at 950 °C for 5 to 500 hours. It was found that σ-phase transformation was notably retarded in the modified alloys due to the prior formation of M23C6 carbides and Ta/Ti being tied up in the MC phase. Detailed investigation has revealed that M23C6 carbides absorb Cr, Mo, and Co, consequently retarding σ-phase transformation that demands Cr, Mo, and Co in addition to Re. In the interdendritic regions, the growth of σ-phase was physically limited by MC carbides and chemically inhibited by the very localized microsegregation.

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References

  1. R.F. Decker, J.P. Rowe, and J.W. Freeman: NACA Technical Note 4049, NACA, Washington, DC, June 1957.

  2. G.L. Erickson: Metal Handbook, 10th ed., ASM, Materials Park, OH, vol. 10, 1990, pp. 981–94.

    Google Scholar 

  3. E.W. Ross and K.S. O’Hara: Superalloy 1996, R.D. Kissinger, D.J. Deye, A.D. Cetal, M.V. Nathal, T.M. Pollock, and D.A. Woodford, eds., TMS, Warrendale, PA, 1996, pp. 19–25.

    Google Scholar 

  4. W.S. Walston, J.C. Schaeffer, and W.H. Murphy: in Superalloy 1996, R.D. Kissinger, D.J. Deye, A.D. Cetal, M.V. Nathal, T.M. Pollock, and D.A. Woodford, eds., TMS, Warrendale, PA, 1996, pp. 9–17.

    Google Scholar 

  5. W. Betteridge and J. Heslop: The Nimonic Alloys and Other Nickel-Base High-Temperature Alloys, 2nd ed., Edward Arnold Ltd., 1974, p. 70.

  6. Q.Z. Chen, N. Jones, and D.M. Knowles: Acta Metall., in press.

  7. K. Harris, G.L. Erickson, and R.E. Schwer: Metal Handbook, 10th ed., ASM, Materials Park, OH, 1990, vol. 10, pp. 995–1006.

    Google Scholar 

  8. J.J. Jackson, M.J. Donachie, R.J. Henricks, and M. Gell: Metall. Trans. A, 1977, vol. 8A, p. 1615.

    CAS  Google Scholar 

  9. E.W. Ross and C.T. Sims: Superalloys II, John Wiley & Sons, New York, NY, 1987, p. 98.

    Google Scholar 

  10. E.W. Ross and C.T. Sims: Superalloys II, John Wiley & Sons, New York, NY, 1987, pp. 111–18.

    Google Scholar 

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Authors and Affiliations

  1. the Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong

    Q. Z. Chen (Research Assistant Professor)

  2. Materials Performance Technologies, Lower Hutt, New Zealand

    D. M. Knowles (Senior Research Manager)

Authors
  1. Q. Z. Chen
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  2. D. M. Knowles
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Chen, Q.Z., Knowles, D.M. Retardation of σ-phase transformation in modified superalloy RR2072. Metall Mater Trans A 33, 1319–1330 (2002). https://doi.org/10.1007/s11661-002-0058-9

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  • DOI: https://doi.org/10.1007/s11661-002-0058-9

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