Phase transformations during high temperature brazing of dissimilar bonding of IN738 to TiAl intermetallic compound using Ni-Si-B ternary filler alloy

Subject Areas :

Dariush  Kokabi ¹ (Ph.D. student, IROST, Tehran, Iran)
Ali  Kaflou ² (Associated Prof., Department of Advanced Materials & Renewable Energies, IROST, Tehran, Iran)
Majid  Pouranvari ³ (Assistant Prof., Faculty of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran)
Reza  Gholamipour ⁴ (Associated Prof., Department of Advanced Materials & Renewable Energies, IROST, Tehran, Iran)

Received: 2019-12-08 Accepted : 2020-02-19 Published : 2021-04-21

Keywords: Inconel738 TiAl intermetallic compound high temperature brazing MBF, 30 Microstructure Microhardness,

Abstract :

In this research microstructural evolution during high temperature brazing of dissimilar bonding of IN738 Ni-base superalloy to TiAl intermetallic compound using an amorphous Ni-Si-B ternary alloy was investigated. Phase transformations via solidification and solid state reactions are discussed. Observations indicated that the microstructure of IN738/MBF-30/TiAl joint consist of four different zones; isothermal solidification zone in both sides, athermally solidified zone in the bond center, diffusion affected zone in the IN738 side and reaction layer in the TiAl side. γ-Ni solid solution phase in ISZ of the IN738 side and binary isostructural solid solutions in ISZ of the TiAl side were formed during holding time at bonding temperature. Ni-Cr borides have been formed due to binary eutectics associated with γ-Ni solid solution in the ASZ during cooling. Cr-Mo borides and Ni-rich boride with different morphologies were precipitated in the DAZ. Ni element from MBF-30 molten interlayer reacted with γ-TiAl base, leading to the formation of the reaction layer containing single phase δ-Ti2Ni and triple phase τ2-Al2TiNi+τ4-AlNi2Ti+β1-NiAl layers adjacent to TiAl substrate. Microhardness evaluation of different zones indicated that some high hardness phases have formed in the bond region and presence of the γ-Ni solid solution in the ASZ cause to decrease the detrimental effects of them. 

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