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

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Kokabi Dariush; KAFLOU ALI; POURANVARI MAJID; Gholamipour Reza

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Journal: Journal of Advanced Processes in Materials Engineering Year:2021 | Volume:15 | Issue:1 (56) Page(s): 11-23

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Title

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

Author(s)

Kokabi Dariush | KAFLOU ALI | POURANVARI MAJID | Gholamipour Reza | Issue Writer Certificate

Keywords

Inconel738. TiAl intermetallic compound. high temperature brazing. MBF-30. Microstructure. MicrohardnessQ1

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 τ 2-Al2TiNi+τ 4-AlNi2Ti+β 1-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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APA: Copy

Kokabi, Dariush, KAFLOU, ALI, POURANVARI, MAJID, & Gholamipour, Reza. (2021). Phase transformations during high temperature brazing of dissimilar bonding of IN738 to TiAl intermetallic compound using Ni-Si-B ternary filler alloy. ADVANCED PROCESSES IN MATERIALS, 15(1 (56) ), 11-23. SID. https://sid.ir/paper/386333/en

Vancouver: Copy

Kokabi Dariush, KAFLOU ALI, POURANVARI MAJID, Gholamipour Reza. Phase transformations during high temperature brazing of dissimilar bonding of IN738 to TiAl intermetallic compound using Ni-Si-B ternary filler alloy. ADVANCED PROCESSES IN MATERIALS[Internet]. 2021;15(1 (56) ):11-23. Available from: https://sid.ir/paper/386333/en

IEEE: Copy

Dariush Kokabi, ALI KAFLOU, MAJID POURANVARI, and Reza Gholamipour, “Phase transformations during high temperature brazing of dissimilar bonding of IN738 to TiAl intermetallic compound using Ni-Si-B ternary filler alloy,” ADVANCED PROCESSES IN MATERIALS, vol. 15, no. 1 (56) , pp. 11–23, 2021, [Online]. Available: https://sid.ir/paper/386333/en

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