Effect of Joining Atmosphere in Transient Liquid Phase Bonding of Inconel 617 Superalloy

Journal Article · Fri Dec 15 04:00:00 EST 2017 · Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-017-1098-2· OSTI ID:22856067

Esmaeili, H.; Farzadi, A. ^[1]

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1. Amirkabir University of Technology (AUT), Department of Mining and Metallurgical Engineering (Iran, Islamic Republic of)

In the present paper, transient liquid phase (TLP) bonding of Inconel 617 alloy under the different furnace atmospheres of vacuum, argon gas, and air was investigated. The experiments were carried out at 1408 K (1135 °C) for 300 minutes by using BNi-1 filler metals with different thicknesses of 50 and 100 µm. The microstructure, chemical analysis, shear strength, and microhardness of the resultant joints were studied. After 300 minutes, complete isothermal solidification was obtained for both the interlayers having 50 and 100 µm thicknesses under all the furnace atmospheres. The specimens bonded under vacuum condition showed the highest shear strength, failure energy, and ductility. Also, the joint produced under argon gas atmosphere using 100-µm-thick filler metal showed a good strength and may be acceptable in many applications. However, the specimens bonded under air atmosphere were weak, due to their further cavities and non-dissolved carbides. The presence of non-dissolved carbides in the diffusion-affected zone resulted in increasing the hardness of the base metal near the interface. The carbides were dissolved and the hardness of the diffusion-affected zone was reduced under vacuum condition compared to argon and air atmospheres. The best result was obtained for the specimen joined using the 50-µm-thick interlayer under vacuum atmosphere, with about 95.8 pct joint efficiency.

• OSTI ID: 22856067
• Journal Information: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science Journal Issue: 6 Vol. 48; ISSN 1073-5615; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ARGON
BONDING
CARBIDES
CHEMICAL ANALYSIS
CONTROLLED ATMOSPHERES
DIFFUSION
DUCTILITY
FILLER METALS
FURNACES
INCONEL 617
LIQUIDS
MICROHARDNESS
MICROSTRUCTURE
SHEAR PROPERTIES
SOLIDIFICATION
THICKNESS