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Phase Analysis in the Region Brazed with Ni-14Cr-10Co-3.5Al-2.5Ta-2.8B Filler Metal Using Electron Backscatter Diffraction

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Abstract:

The phases formed in the wide-gap region brazed with Ni-14Cr-10Co-3.5Al-2.5Ta-2.8B filler metal powder in IN738 superalloy were investigated by electron backscatter diffraction (EBSD). The wide-gap brazing process was carried out in a vacuum of 2×10-5 torr at 1503 K. The region brazed with filler metal powders had a microstructure consisting of two kinds of eutectic colonies, one is Ni solid solution-CrB eutectic and the other is Ni solid solution-Ni3B eutectic. EBSD pattern analysis revealed that the CrB phase had orthorhombic structure with lattice parameters of a=0.297, b=0.786 and c=0.293 nm, and the Ni3B phase had orthorhombic structure with lattice parameters of a=0.439, b=0.522 and c=0.662 nm. The cuboidal-shaped phase precipitated in the Ni solid solution was found to be the γ' (Ni3Al) phase, which had cubic structure with lattice parameter of a=0.357 nm.

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Periodical:

Materials Science Forum (Volume 569)

Pages:

93-96

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.569.93

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Online since:

January 2008

Authors:

Yong Hwan Kim, S.I. Kwun

Keywords:

Brazing, CrB, Electron Backscatter Diffraction (EBSD), Eutectic Colony, Ni3B, γ' (Ni3Al)

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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