Metadynamic Recrystallization of the Nickel-Based Superalloy Allvac 718Plus^TM

Abstract:

During hot working of the recently developed nickel based alloy Allvac 718PlusTM softening kinetics like dynamic, metadynamic as well as static recrystallization govern the microstructure evolution during and after hot forming and hence the final mechanical properties. In this work the metadynamic recrystallization was investigated using double hit compression tests. The classical methodology of offset stress comparison was not usable because of discontinuous yielding of this material. Thus a new method to describe the softening during metadynamic recrystallization was developed, which compares the deformation energy at equal strains, i.e. the area beneath the true strain vs. true stress curve, of the first and second hit as well as at steady state.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 2327-2332
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.2327
• Online since: January 2010
• Authors: Christof Sommitsch, Daniel Huber, Martin Stockinger
• Keywords: Finite Element Model (FEM), Metadynamic Recrystallization, Superalloy

References

[1] D.F. Paulonis and J.J. Schirra, in: Proc. Superalloys 718, 625, 706 and Various Derivatives, edited by E.A. Loria, The Minerals, Metals and Materials Society, Warrendale (2001), p.13.

DOI: 10.7449/2001/superalloys_2001_13_23

[2] R.C. Reed: The Superalloys (Cambridge Univ. Press, Cambridge 2008).

[3] W.D. Cao and R. Kennedy, in: Proc. Superalloys, edited by K.A. Green, The Minerals, Metals and Materials Society, Warrendale (2004), p.91.

[4] D.S. Bergstrom and T.D. Bayha, in: Proc. Superalloys 718, 625, 706 and Various Derivatives, edited by E.A. Loria, The Minerals, Metals and Materials Society, Warrendale (2005), p.243.

DOI: 10.7449/2005/superalloys_2005_243_252

[5] R.L. Kennedy, in: Proc. Superalloys 718, 625, 706 and Various Derivatives, edited by E.A. Loria, The Minerals, Metals and Materials Society, Warrendale (2005), p.1.

[6] R.A.P. Djaic and J.J. Jonas: J. Iron and Steel Inst. Vol. 210 (1972), p.256.

[7] P.E. Mosser, G. Leconte, J. Leray, A. Lasalmonie and Y. Honnorat, in: Proc. Superalloys 718 - metallurgy and applications, edited by E.A. Loria, The Minerals, Metals and Materials Society, Warrendale (1989), p.179.

DOI: 10.7449/1989/superalloys_1989_179_188

[8] J.J. Jonas, C.M. Sellars and W.J. McG. Tegart: Metall. Reviews Vol. 130 (1969), p.1.

[9] P. Uranga, A.I. Fernandez, B. Lopez and J.M. Rodriguez-Ibabe: Mater. Sci. Eng. Vol. A345 (2003), p.319.

[10] L. Karjalainen and J. Perttula: ISIJ Int. Vol. 36 (1996), p.729.

[11] S. Kleber and C. Sommitsch: Mater. Sci. Forum Vol. 467-470 (2004), p.1237.

[12] K.P. Rao, Y.K.D.V. Prasad and E.B. Hawbolt: J. Mater. Proc. Techn. Vol. 77 (1998), p.166.

[13] C. Stotter, C. Sommitsch, J. Wagner, H. Leitner, I. Letofsky-Papst, G.A. Zickler, W. Prantl and M. Stockinger: Int. J. Mater. Res. 99 (2008), p.376.

DOI: 10.3139/146.101648

[14] R. Radis, G. Zickler, M. Stockinger, C. Sommitsch and E. Kozeschnik, in: Proc. Thermec 09, International Conference on Processing and Manufacturing of Advanced Materials, T. Chandra et al. (Eds. ) (2009), in press.

[15] D. Huber, C. Stotter, C. Sommitsch, S. Mitsche, P. Poelt, B. Buchmayr and M. Stockinger, in: Proc. 11th Int. Symp. Superalloys 2008, edited by R.C. Reed, The Minerals, Metals and Materials Society, Warrendale (2008), p.855.

DOI: 10.7449/2008/superalloys_2008_855_861

[16] S.A. Nalawade, M. Sundararaman, R. Kishore and J.G. Shah: Scripta Mater. 59 (2008), p.991.

[17] A. Oradei-Basile and J.F. Radavich: in: Proc. Superalloys 718, 625 and Various Derivatives, edited by E.A. Loria, The Minerals, Metals and Materials Society, Warrendale (1991), p.325.

DOI: 10.7449/1991/superalloys_1991_325_335

[18] M. Stockinger: Mikrostrukturelle Simulation des Gesenkschmiedens von %ickelbasis- Legierungen (PhD Thesis, Graz University of Technology 2003).