A Newly Generated Nearly Lamellar Microstructure in Cast Ti-48Al-2Nb-2Cr Alloy for High-Temperature Strengthening

Abstract

Alloy 4822 (Ti-48Al-2Cr-2Nb at. pct) cast material was given a controlled heat treatment cycle to generate a casting nearly lamellar (CNL) microstructure that enhances the temperature capability over its current engineering casting duplex (CDP) microstructure form. The cycle consisted of three steps: a short α field annealing, an α + γ field annealing, and then aging at a low temperature, with each step being followed by controlled cooling. The resulted microstructure is shown to be a mixture of non-uniformly distributed ~ 250 μm size lamellar colonies containing ~ 0.15 µm spaced laths. Standard tensile testing at 700 °C shows a yield stress of 344 MPa that is ~ 55 MPa greater than that of the current engineering CDP form. The sequential microstructure evolution processes following the three-step thermal cycle are assessed and explained in terms of phase transformations taking place across and below the α transus upon isothermal treatment and subsequent cooling. The resulted increases in high-temperature strengthening are explained by the colony and γ grain size distributions. The strengthening mechanism along with the significance is discussed.

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References

  1. 1.

    Y.W. Kim: JOM, 1994, vol. 46, pp. 30-49.

    CAS  Article  Google Scholar 

  2. 2.

    H. Clemens and H. Kestler: Adv. Eng. Mater., 2000, vol. 2, pp. 551-70.

    CAS  Article  Google Scholar 

  3. 3.

    Y-W. Kim and S.L. Kim: JOM, 2018, vol. 70, pp. 553-60.

    Article  Google Scholar 

  4. 4.

    C. Austin and T. Kelly: Structural Intermetallics, 1993, TMS, pp. 143–50.

  5. 5.

    B. London, D. Larsen, D.A. Wheeler, and P.R. Aimone: Structural Intermetallics, 1993, TMS, pp. 151–57.

  6. 6.

    F. Appel, J.D.H. Paul, M. Oehring, C. Buque, C. Klinkenberg, and T. Carneiro: Niobium for High Temperature Applications, 2004, TMS, pp. 139–52.

  7. 7.

    H. Clemens, H.F. Chladil, W. Wallgram, G.A. Zickler, R. Gerling, K.-D. Liss, S. Kremmer, V. Güther, and W. Smarsl: Intermetallics, 2008, vol. 16, pp. 827-33.

    CAS  Article  Google Scholar 

  8. 8.

    G.L. Chen, W.J. Zhang, Z.C. Liu, S.J. Li, and Y-W. Kim: Gamma Titanium Aluminides 1999, 1999, TMS, pp. 371–80.

  9. 9.

    M.J. Weimer and T.J. Kelly: GE Aviation, Ohio, Unpublished Results Presented at 3rd int’l Workshop on Gamma TiAl Technologies, 2006.

  10. 10.

    B.P. Bewlay, M. Weimer, T. Kelly, A. Suzuki, and P.R. Subramanian: Intermetallic-Based Alloys-Science, Technology, and Applications, Mater. Res. Soc. Symp. Proc., Warrendale, PA, 2012, vol. 1516, pp. 49–58.

  11. 11.

    W. Smarsly, J. Esslinger, and H. Clemens: MTU, Germany, research and development results presented at GTA-2014, 2014.

  12. 12.

    Habel U, Heutling F, Helm D, Kunze C, Smarsly W, Das G, Clemens H: World Titanium. Wiley, Hoboken, pp. 1223-27 (2015)

    Google Scholar 

  13. 13.

    Y-W. Kim and D.M. Dimiduk: JOM, 1991, vol. 41, pp. 40-47.

    Article  Google Scholar 

  14. 14.

    Y-W. Kim, Acta Metall. Mater. 1992, vol. 40, pp. 1121-34.

    CAS  Article  Google Scholar 

  15. 15.

    X.J. Xu, Y.L. Wang, F.Z. Gao, and G.L. Chen: J. alloys compd., 2006, vol. 414, pp. 131-36.

    CAS  Article  Google Scholar 

  16. 16.

    X.J. Xu, J.P. Lin, Z.K. Teng, Y.L. Wang, and G.L. Chen: Mater. Lett., 2007, vol. 61, pp. 369-73.

    CAS  Article  Google Scholar 

  17. 17.

    G. Yang, H.C. Kou, Y. Liu, J.R. Yang, J. Wang, S.Y. Zhang, J.S. Li, and H.Z. Fu: Intermetallics, 2015, vol. 63, pp. 1-6.

    CAS  Article  Google Scholar 

  18. 18.

    Y.W. Kim: JOM, 1989, vol. 41, pp. 24-30.

    CAS  Article  Google Scholar 

  19. 19.

    B.D. Worth, J.W. Jones, and J.E. Allison: Metall. Mater. Trans. A, 1995, vol. 264, pp. 2947-59.

    Article  Google Scholar 

  20. 20.

    Y.W. Kim, Mater. Sci. Eng. A, 1995, vol. A192/193, pp. 519-533.

    CAS  Article  Google Scholar 

  21. 21.

    Y.W. Kim: Intermetallics, 1998, vol. 6, pp. 623-28.

    CAS  Article  Google Scholar 

  22. 22.

    J.C. Schuster and M.Palm: J. Phase Equilib. Diff., 2006, vol. 27, pp. 255–77.

    CAS  Article  Google Scholar 

  23. 23.

    U.R. Kattner, J.C. Lin, and Y.A. Chang: Metall. Mater. Trans. A, 1992, vol. 23, pp. 2081-90.

    Article  Google Scholar 

  24. 24.

    Y.L. Jung and J.K. Park: Acta Mater., 1998, vol. 46, pp. 4123-30.

    CAS  Article  Google Scholar 

  25. 25.

    M.J. Blackburn: The Science Technology & Application of Titanium, Pergamon Press, Oxford, United Kindom, 1970, pp. 633-43.

    Google Scholar 

  26. 26.

    A. Denquin and S. Naka: Acta Mater., 1996, vol. 44, pp. 343-52.

    CAS  Article  Google Scholar 

  27. 27.

    S.A. Jones and M.J. Kafuman: Acta Metall. Mater., 1993, vol. 41, pp. 387-98.

    CAS  Article  Google Scholar 

  28. 28.

    M. Charpentier, A. Hazotte, and D. Daloz: Mater. Sci. Eng. A, 2008, vol. 491, pp. 321-30.

    Article  Google Scholar 

  29. 29.

    Z.W. Huang: Scr. Mater., 2005, vol. 52, pp. 1021-25.

    CAS  Article  Google Scholar 

  30. 30.

    Y.W. Cui, G.L. Xu, R. Kato, X.G. Lu, R. Kainuma, and K. Ishida: Metall. Mater. Trans. A, 2013, vol. 44A, pp. 1621–25.

    Article  Google Scholar 

  31. 31.

    M. Koppers, C. Herzig, M. Friesel, and Y. Mishin: Acta. Mater., 1997, vol. 45, pp. 4181-91.

    CAS  Article  Google Scholar 

  32. 32.

    C.M. Sellars and J. A. Whiteman: Metal Sci., 1978, vol. 13, pp. 187-94.

    Article  Google Scholar 

  33. 33.

    S.F. Franzén and J. Karlsson: Master’s Thesis, Chalmers University of Technology, Gothenburg, Sweden, 2010.

  34. 34.

    J.H. Moll: JOM, 2000, vol. 52, 32-34.

    CAS  Article  Google Scholar 

  35. 35.

    H. Clemens and S. Mayer: Adv. Eng. Mater., 2013, vol. 15, pp. 191-215.

    CAS  Article  Google Scholar 

  36. 36.

    Y. Xia, P. Yu, G.B. Schaffer, and M. Qian: Mater. Sci. Eng. A, 2013, vol. 574, pp. 176-85.

    CAS  Article  Google Scholar 

  37. 37.

    Q. Wang, R. Chen, X. Gong, J. Guo, Y. Su, H. Ding, and H. Fu: Metall. Mater. Trans. A, 2018, vol. 49A, pp. 4555–64.

    Article  Google Scholar 

  38. 38.

    S. Biamino, A. Penna, U. Ackelid, S. Sabbadini, O. Tassa, P. Fino, M. Pavese, P. Gennaro, and C. Badini: Intermetallics, 2011, vol. 19, pp. 776-81.

    CAS  Article  Google Scholar 

  39. 39.

    D. Hu: Intermetallics, 2001, vol. 9, pp. 1037-43.

    CAS  Article  Google Scholar 

  40. 40.

    X.H. Wu: Intermetallics, 2006, vol. 14, pp. 1114-22.

    CAS  Article  Google Scholar 

Download references

Acknowledgments

The current study was financially supported by the National Natural Science Foundation of China (Nos. 51401168 and 51774238) and the 2018 Joint Foundation of Ministry of Education for Equipment Pre-research (No. 6141A020332).

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Correspondence to Jieren Yang or Sang-Lan Kim.

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Manuscript submitted April 19, 2019.

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Gao, Z., Yang, J., Wu, Y. et al. A Newly Generated Nearly Lamellar Microstructure in Cast Ti-48Al-2Nb-2Cr Alloy for High-Temperature Strengthening. Metall Mater Trans A 50, 5839–5852 (2019). https://doi.org/10.1007/s11661-019-05491-8

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