Investigation on the dissolution of η phase in a cast Ni-based superalloy

M. R. Jahangiri; H. Arabi; S. M. A. Boutorabi

doi:10.1007/s12613-013-0691-x

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M. R. Jahangiri, H. Arabi, and S. M. A. Boutorabi, Investigation on the dissolution of η phase in a cast Ni-based superalloy, Int. J. Miner. Metall. Mater., 20(2013), No. 1, pp.42-48. https://dx.doi.org/10.1007/s12613-013-0691-x

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Investigation on the dissolution of η phase in a cast Ni-based superalloy

摘要: The dissolution behavior of η phase has been investigated in a cast Ni-based superalloy. The results showed that the platelets and blocks of η phase were formed within the interdendritic regions of the microstructure. Applying standard solution annealing at 1150–1160℃ for a period of 4 h did not result in the complete dissolution of η phase. For the complete dissolution of η phase without residual incipient melting, a 2-step solution annealing has been recommended. After dissolution at high temperatures, the η phase transforms to two MC-type carbides: one is enriched in Ti, Nb, and Ta, and the other is of (Zr,Ti)C type.

Investigation on the dissolution of η phase in a cast Ni-based superalloy

Abstract: The dissolution behavior of η phase has been investigated in a cast Ni-based superalloy. The results showed that the platelets and blocks of η phase were formed within the interdendritic regions of the microstructure. Applying standard solution annealing at 1150–1160℃ for a period of 4 h did not result in the complete dissolution of η phase. For the complete dissolution of η phase without residual incipient melting, a 2-step solution annealing has been recommended. After dissolution at high temperatures, the η phase transforms to two MC-type carbides: one is enriched in Ti, Nb, and Ta, and the other is of (Zr,Ti)C type.

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