Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys

Naalchian, Mojtaba; Kasiri-Asgarani, Masoud; Shamanian, Morteza; Bakhtiari, Reza; Bakhsheshi-Rad, Hamid Reza; Berto, Filippo; Das, Oisik

doi:10.3390/ma14164600

Open AccessArticle

Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys

by

Mojtaba Naalchian

¹,

Masoud Kasiri-Asgarani

^1,*,

Morteza Shamanian

^2,*

,

Reza Bakhtiari

³,

Hamid Reza Bakhsheshi-Rad

^1,*,

Filippo Berto

^4,* and

Oisik Das

⁵

¹

Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

²

Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran

³

Department of Materials Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran

⁴

Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway

⁵

Structural and Fire Engineering Division, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 97187 Luleå, Sweden

^*

Authors to whom correspondence should be addressed.

Materials 2021, 14(16), 4600; https://doi.org/10.3390/ma14164600

Submission received: 12 July 2021 / Revised: 3 August 2021 / Accepted: 5 August 2021 / Published: 16 August 2021

(This article belongs to the Special Issue Surface Processing Technology for High-Temperature Resistant Materials)

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Abstract

Phase transformations and the melting range of the interlayer BNi-3 were investigated by differential scanning calorimetry, which showed three stages of crystallization during heating. There were three exothermic peaks that indicated crystallization in the solid state. The cobalt-based X-45 and FSX-414 superalloys were bonded with interlayer BNi-3 at a constant holding time of 10 min with bonding temperatures of 1010, 1050, 1100, and 1150 °C using a vacuum diffusion brazing process. Examination of microstructural changes in the base metals with light microscopy and scanning electron microscopy coupled with X-ray spectroscopy based on the energy distribution showed that increasing temperature caused a solidification mode, such that the bonding centerline at 1010 °C/10 min included a γ-solid solution, Ni₃B, Ni₆Si₂B, and Ni₃Si. The athermally solidified zone of the transient liquid phase (TLP)-bonded sample at 1050 °C/10 min involved a γ-solid solution, Ni₃B, CrB, Ni₆Si₂B, and Ni₃Si. Finally, isothermal solidification was completed within 10 min at 1150 °C. The diffusion-affected zones on both sides had three distinct zones: a coarse block precipitation zone, a fine and needle-like mixed-precipitation zone, and a needle-like precipitation zone. By increasing the bonding temperature, the diffusion-affected zone became wider and led to dissolution.

Keywords: microstructural changes; mechanical properties; cobalt-based superalloy; transient liquid phase bonding

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MDPI and ACS Style

Naalchian, M.; Kasiri-Asgarani, M.; Shamanian, M.; Bakhtiari, R.; Bakhsheshi-Rad, H.R.; Berto, F.; Das, O. Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys. Materials 2021, 14, 4600. https://doi.org/10.3390/ma14164600

AMA Style

Naalchian M, Kasiri-Asgarani M, Shamanian M, Bakhtiari R, Bakhsheshi-Rad HR, Berto F, Das O. Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys. Materials. 2021; 14(16):4600. https://doi.org/10.3390/ma14164600

Chicago/Turabian Style

Naalchian, Mojtaba, Masoud Kasiri-Asgarani, Morteza Shamanian, Reza Bakhtiari, Hamid Reza Bakhsheshi-Rad, Filippo Berto, and Oisik Das. 2021. "Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys" Materials 14, no. 16: 4600. https://doi.org/10.3390/ma14164600

APA Style

Naalchian, M., Kasiri-Asgarani, M., Shamanian, M., Bakhtiari, R., Bakhsheshi-Rad, H. R., Berto, F., & Das, O. (2021). Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys. Materials, 14(16), 4600. https://doi.org/10.3390/ma14164600

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Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys

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