Effect of Boron on Solidification Microstructure in a Single Crystal Superalloy

Abstract:

Carbon and boron were mainly considered to strengthen grain boundaries formed during single crystal casting of complex shaped components. However, those elements cause segregation forming the phase with low melting temperature or with brittle nature. To determine the optimum amount of these elements, the effect of boron on solidification behavior was investigated in the C doped single crystal RR 2072 alloy. The solid/liquid interface morphologies and the solidification microstructures were studied at various solidification rates and with B addition by directional solidification.

• Periodical: Materials Science Forum (Volumes 486-487)
• Pages: 460-463
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.486-487.460
• Online since: June 2005
• Authors: Chang Yong Jo, D.H. Kim, Yeong Seok Yoo, D.H. Ye, Jung Hun Lee
• Keywords: Boron, Defect Tolerance, Directional Solidification, Single Crystal Superalloy

References

[1] R.C. Heimink, R.A. Testin, A.R. Price, R. Pachman, G,L. Elickson, K. Harris, J.A. Nesbitt, and J.F. Radavich, in Superalloy 2000, Proc. of the 2000 Superalloys Symp., eds. T.M. Pollck et. al. (TMS, Warrendale, PA, 2002) p.171.

DOI: 10.7449/2000/superalloys_2000_171_179

[2] K. Harris and J.B. Wahl, in Parsons 2000 Advanced Mateials for 21st Ecntury Turbines and Power Plant, Proc. of 2000 Charles Parson Turbine Conference, eds. A. Strang et. al., IOM communications Ltd., Cambridge, UK, 2000) p.832.

[3] H. Tamaki, A. Yoshinari, A. Okayama and S. Nakamura, in Superalloy 2000, Proc. of the 2000 Superalloys Symp., eds. T.M. Pollck et. al. (TMS, Warrendale, PA, 2002) p.757.

[4] Q.Z. Chen, N. Jones, D.M. Knowles, Acta Mater., 50 (2002) 1095.

[5] J.H. Lee and J.D. Verhoeven, J. Phase Equil. 15 (1994) 136.

[6] J.D. Verhoeven, Fundamentals of Physical Metallurgy (John Wiley and Sons, New York, 1975) p.257.