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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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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Edited by:

Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee

Pages:

93-96

Citation:

Y. H. Kim and S.I. Kwun, "Phase Analysis in the Region Brazed with Ni-14Cr-10Co-3.5Al-2.5Ta-2.8B Filler Metal Using Electron Backscatter Diffraction", Materials Science Forum, Vol. 569, pp. 93-96, 2008

Online since:

January 2008

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$38.00

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