Effect of Hot Isostatic Pressing on the Microstructure of K417G Cast Turbine Discs

Abstract:

The present study focused on the effect of hot isostatic pressing (HIP) treatment on the microstructure of K417G superalloy. The experimental results showed that after the HIP treatment the size and volume fraction of the porosities significantly decreased. In addition, the dendritic structure and γ/γ' eutectics in the as-cast specimens became obscure after the HIP treatment due to the improvement of segregation. The γ′ phases in the dendrite core were smaller than those in the interdendritic region, whether in the as-cast or HIP specimens. The slow cooling at the end of the HIP treatment leads to the irregular morphology of the γ′ phases.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 557-561
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.557
• Online since: April 2015
• Authors: Jie Li, Chao Yuan, Jian Ting Guo, Jie Shan Hou, Lan Zhang Zhou
• Keywords: Hot Isostatic Pressing (HIP), K417G Superalloy, Microstructure, Porosity

References

[1] B.A. Gryaznov, S.S. Gorodetskii and A.S. Tugarinov, Damage in the turbine blades of aviation after operation, probl. Prochn 11(1973) 65-67.

[2] G. Marahleh, A.R.I. Khrder and H.F. Hamad, Creep life prediction of service-exposed turbine blades, Mater. Sci. Eng. A. 433(2006) 306-309.

DOI: 10.1016/j.msea.2006.06.066

[3] E.N. Kablow, Cast gas-turbine engine blades, Misis, Moscow, (2001).

[4] S.H. Chang, Optimization of pressure and soaking time of HIP treatment on 713LC cast superalloy, Mater. Trans. 50(2009) 909-916.

DOI: 10.2320/matertrans.mer2008435

[5] G.E. Wasielewski, N.R. Lindblad, Elimination of casting defects using HIP, Inter. Confer. on superalloys, USA. (1972) D1-D24.

DOI: 10.7449/1972/superalloys_1972_d-1_d-24

[6] S.C. Lee, S.H. Chang, T.P. Tang, H.H. Ho and J.K. Chen, Improvement in the microstructure and tensile properties of Inconel 718 superalloy by HIP treatment, Mater. Trans. 47(2006) 2877-2881.

DOI: 10.2320/matertrans.47.2877

[7] I. Radomir, V. Geaman and M. Stoicanescu, Densification mechanisms made during creep techniques applied to the hot isostatic pressing, Social and Behavioral Sciences, 62(2012) 779-782.

DOI: 10.1016/j.sbspro.2012.09.131

[8] A.G. Beresnev, Effect of hot isostatic pressing on the structure and properties of cast polycrystalline gas-turbine blades made of nickel superalloys, Matally. 3(2012) 48-56.

DOI: 10.1134/s0036029512050047

[9] G.X. Hu, X. Cai, and Y.H. Rong, Fundamentals of materials science, Shang Hai Jiao Tong University Press, (in Chinese) 2010. Chapter 4.

[10] R.A. Stevens, P.E.J. Flewitt, Removal of casting porosity in superalloy IN738 using hydrostatic pressure sintering, Metal. Science, 14(1980) 81-88.

DOI: 10.1179/030634580790426247

[11] A.G. Beresnev, Effect of hot isostatic pressing on the structure and properties of cast polycrystalline gas-turbine blades made of nickel superalloys, Matally. 3(2012) 48-56.

DOI: 10.1134/s0036029512050047