Bicrystal samples of Ni base superalloy IN792 were produced to study the structure evolution in directional solidification process. In the case of converging grains, the misaligned dendrites were able to block the better aligned dendrites at the grain boundary. The dendrite blocking leaded to inclination of the grain boundary from the misaligned grain to the better aligned grain. Thus, the better aligned grain was overgrown by the misaligned grain. In the case of diverging grains, dendrite development at the grain boundary leaded to inclination of the grain boundary from the better aligned grain to the misaligned grain. Consequently, the better aligned grain overgrew the misaligned grain.
ZHOU Yi-Zhou
,
JIN Shou
,
XUN Xiao-Feng
. STRUCTURE EVOLUTION IN DIRECTIONALLY SOLIDIFIED BICRYSTALS OF NICKEL BASE SUPERALLOYS[J]. Acta Metall Sin, 2010
, 46(11)
: 1327
-1334
.
DOI: 10.3724/SP.J.1037.2010.00280
[1] Mclean M. Directionally Solidified Materials for High Temperature Service. London: Metals Society, 1983: 5
[2] Quested P N, Mclean M. Mater Sci Eng, 1984; 65: 171
[3] Reed R C. The Superalloys Fundamentals and Applications. Cambridge: Cambridge University Press, 2006: 124
[4] Gell M, Duhl D N, Giamei A F. Superalloys 1980, Metals Park, OH: American Society for Metals, 1980: 205
[5] Ross E W, O’Hara K S. Superalloys 1996, Warrendale, PA: TMS, 1996: 19
[6] Kear B H, Piearcey B J. Trans Metall Soc AIME, 1967; 239: 1209
[7] Li J R, Zhao J Q, Liu S Z, Han M. Superalloys 2008, Warrendale, PA: TMS, 2008: 443
[8] Walton D, Chalmers B. Trans Metall Soc AIME, 1959; 215: 447
[9] McLean M, Lee P D, Shollock B A. Advance Materials and Processes for Gas Turbines. Warrendale, PA: TMS, 2003: 83
[10] Esaka H. PhD Thesis, No.615, Ecole Polytechnique Federale de Lausanne, Switzerland: 1986
[11] Rappaz M, Gandin C A. Acta Metall Mater, 1994; 42: 2233
[12] Rappaz M, Gandin C A, Desbiolles J L, Thevoz P. Metall Mater Trans, 1996; 27A: 695
[13] Zhou Y Z, Volek A, Green N R. Acta Mater, 2008; 56: 2631
[14] Zhou Y Z, Green N R. Superalloys 2008. Warrendale, PA: TMS, 2008: 317
[15] Stanford N, Djakovic A, Shollock B A, McLean M, D’Souza N. Superalloys 2004, Warrendale, PA: TMS, 2004: 719
[16] D’Souza N, Jennings P A, Yang X L, Dong H B, McLean M. Metall Mater Trans, 2005; 36B: 657
[17] Zhang J, Singer R F. Metall Mater Trans, 2004; 35A: 939
[18] Wagner A, Shollock B A, McLean M. Mater Sci Eng, 2004; 374A: 270
