Evolution of microstructure and mechanical properties on dissimilar transient liquid phase (TLP) bonding of GTD-111 and
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RESEARCH PAPER
Evolution of microstructure and mechanical properties on dissimilar transient liquid phase (TLP) bonding of GTD-111 and IN-718 by BNi-9 (AWS A5.8/A5.8M) interlayer Ali Izadi Ghahferokhi 1 & Masoud Kasiri-Asgarani 1
&
Kamran Amini 2 & Reza Ebrahimi-kahrizsangi 1 & Mahdi Rafiei 1
Received: 11 March 2020 / Accepted: 12 October 2020 # International Institute of Welding 2020
Abstract Dissimilar transient liquid phase (TLP) bonding of GTD-111 and IN-718 nickel-based superalloys was investigated using BNi-9 (AWS A5.8/A5.8M) as an interlayer. The effect of the bonding time on the microstructure and mechanical properties of the TLPbonded specimens was studied at 1100 °C using optical microscopy (OM), scanning electron microscopy (SEM) equipped with energy-dispersive spectrometry (EDS), and micro-hardness and shear strength analyses. Joint microstructural studies revealed that at the bonding times shorter than 75 min, nickel- and chromium-rich borides were formed with the joint centerline. The volume fraction of intermetallic compounds decreased with the increase of the bonding time and the diffusion of boron element whereby the isothermal solidification eventually completed after 75 min. Micro-hardness investigations along the bonding joint showed that the hardness of an isothermal solidification zone (ISZ) decreased with the completion of isothermal solidification. The hardest zone in the joint structure belonged to the athermal solidification zone (ASZ). The shear strength test results showed that incrementing the bonding time increased the shear strength where the shear strength value at 1 min/1100 °C (320 MPa) raised to 590 MPa after the completion of isothermal solidification. Keywords TLP bonding . GTD-111 superalloy . IN718 superalloy . BNi-9 interlayer . Mechanical properties . Bonding time
1 Introduction Nickel-based superalloys have multiple interesting specifications such as outstanding high-temperature tensile strength and microstructural stability, good fatigue strength, and satisfactory creep and stress rupture properties along with proper oxidation and corrosion resistance [1]. These specifications
This article is part of the Topical Collection on Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding * Masoud Kasiri-Asgarani [email protected]; [email protected] * Kamran Amini [email protected] 1
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2
Center for Advanced Engineering Research, Majlesi Branch, Islamic Azad University, Isfahan, Iran
make superalloys a good option for manufacturing the components used in gas turbines due to their complex shape configurations [2], albeit it is inevitable to confront defects such as formation of thermal fatigue and corrosion cracks at high operational temperatures. Repairing processes such as joining methods are used to restore damaged parts to an applicable condition [3]. Common joining processes carried out
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