Modeling of Unidirectional Growth in a Single Crystal Turbine Blade Casting

Abstract:

Article Preview

Single crystal superalloy turbine blade are widely used in aero-engineering. However, there are often grain defects occurring during the fabrication of blade by casting. It is important to study the formation of microstructure related defects in turbine blades. Single crystal blade sample castings of a nickel-base superalloy were produced at different withdrawal rates by the directional solidification process and investment casting. There was a difference between the microstructure morphology at the top part of the turbine blade sample castings and the one at the bottom. Higher withdrawal rates led to more differences in the microstructure and a higher probability of crystallographic defect formation such as high angle boundaries at locations with an abrupt change of the transversal section area. To further investigate the formation of grain defects, a numerical simulation technique was used to predict the crystallographic defects occurring during directional solidification. The simulation results agreed with the experimental ones.

Info:

Periodical:

Edited by:

A Roósz, M. Rettenmayr and Z. Gácsi

Pages:

111-116

DOI:

10.4028/www.scientific.net/MSF.508.111

Citation:

Q. Y. Xu et al., "Modeling of Unidirectional Growth in a Single Crystal Turbine Blade Casting", Materials Science Forum, Vol. 508, pp. 111-116, 2006

Online since:

March 2006

Export:

Price:

$35.00

[1] D.G. Morris, S. Naka, P. Caron: Intermetallics and superalloys (Weinheim; New York: Wiley-VCH: Deutsche Gesellschaft f Materialkunde, 2000).

[2] G.J.S. Higginbotham: Mater. Sci. Technol. Vol. 2 (1986), p.442.

[3] I. Wagner, P.R. Sahm: The Science of Casting and Solidification (Romania, 2001), p.201.

[4] P.R. Beeley, R.F. Smart: Investment Casting (The Institute of Materials, London, UK 1995).

[5] K.O. Yu: Modeling for Casting and Solidification Processing (Marcel Dekker, Inc., New York 2002).

[6] R.D. Kissinger, D.J. Deye, D.L. Anton, et al: Superalloys 1996 (The Minerals, Metals and Materials Society, Warrendale, Pennsylvania, USA 1996).

[7] F.R.N. Nabarro, H.L. de Villiers: The Physics of Creep (Taylor and Francis, London 1995).

[8] R.W. Cahn, A.G. Evans, M. McLean: High Temperature Structural Materials (Chapman and Hall, London 1996).

[9] A. Wagner, B.A. Shollock and M. McLean: Materials Science and Engineering Vol. A374 (2004), p.270.

[10] A. De Bussac, Ch. -A. Gandin: Materials Science and Engineering Vol. A237 (1997), p.35.

[11] W.J. Beek, K.M.K. Muttzall, J.W. van Heuven: Transport Phenomena (John Wiley & Sons, LTD, New York 1999).

[12] Z.J. Liang, Q.Y. Xu, J.R. Li, et al.: Acta Metall Sin Vol. 40 (2004), p.439.

In order to see related information, you need to Login.