Effect of Initial Particle Size on Coarsening Kinetics of γ Prime Precipitate in Nickel-Based Superalloy - A Phase Field Study

Abstract:

The effect of initia gamma prime particle size on coarsening kinetics of gamma prime precipitates in Nickel-based superalloys has been studied by means of phase field method which takes into account the lattice misfit. The simulation shows that the gamma prime precipitate morphology at the late stage of coarsening is independent of initial particle size, and the rectangle-like precipitates dominate the matrix which is in good agreement with experimental studies. The coarsening exponent increases with initial size, while the coarsening rate constant exhibits no apparent regularity. Although the coarsening trend is independent of initial particle size, the precipitate size increases with initial size at a given aging time. Through precipitate size distribution calculation, it is found that the size distribution is fairly stable, which is not sensitive to the initial particle size.

• Periodical: Applied Mechanics and Materials (Volumes 117-119)
• Pages: 1834-1838
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.117-119.1834
• Online since: October 2011
• Authors: Chang Bo Ke, Bao Zhong Xie
• Keywords: Coarsening Kinetics, Coherent Precipitate, Phase-Field Method, Superalloy

References

[1] Y. Wang, D. Banerjee, C.C. Su and A.G. Kachaturyan: Acta Mater. Vol. 46 (1998), p.2983

[2] Y.Y. Liu: J. Mater. Sci. Vol. 31 (1996), p.4311

[3] D.M. Kim and A.J. Ardell: Scr. Mater. Vol. 43 (2000), p.381

[4] D.M. Kim and A.J. Ardell: Acta Mater. Vol. 51 (2003), p.4073

[5] P.M. Sarosi, B. Wang, J.P. Simmons, Y. Wang and M.J. Mills: Scr. Mater. Vol. 57 (2007), p.767

[6] D. Banerjee, R. Banerjee and Y. Wang: Scr. Mater. Vol. 41 (1999), p.1023

[7] V. Vaithyanathan and L.Q. Chen: Acta Mater. Vol. 50 (2002), p.4061

[8] Y.H. Wen, B. Wang, J.P. Simmons and Y. Wang: Acta Mater. Vol. 54 (2006), p. (2087)

[9] D. Fan and L.Q. Chen: Acta Mater. Vol. 45 (1997), p.611