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solute-redistribution
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Diffusion brazing metallurgy of IN718/Ni-Cr-Si-B-Fe/IN718
, Article Welding Journal ; Vol. 93, issue. 2 , February , 2014 , pp. 60s-68s ; ISSN: 00432296 ; Ekrami, A ; Kokabi, A. H ; Sharif University of Technology
Abstract
This paper investigates the effect of microstructure development on mechanical properties of diffusion brazed IN718 nickel-based superalloy using a Ni-Cr-Si-B-Fe filler metal. The phase transformations during diffusion brazing of IN718/Ni-Cr-Si-B-Fe/IN718, which dictate the microstructure of the bonds are governed by diffusion-induced isothermal solidification, cooling-induced athermal solidification, and diffusion-induced solid-state precipitation. It was found that when partial isothermal solidification occurs at the bonding temperature, the residual liquid is transformed into eutectic-type microconstituents. Considering solute redistribution and segregation behavior of the melting point...
Solute redistribution during transient liquid phase bonding of IN738LC with BNi-3 interlayer
, Article Materials Science and Technology ; Volume 24, Issue 4 , 2008 , Pages 449-456 ; 02670836 (ISSN) ; Ekrami, A ; Ohsasa, K ; Matsuura, K ; Sharif University of Technology
2008
Abstract
Redistribution of alloying elements in the transient liquid phase (TLP) bonding zone of IN738LC/ BNi-3/IN738LC was studied to investigate microstructural evolution in this area. Wavelength dispersive spectrometry and electron probe microanalysis revealed that, during non-isothermal solidification in the TLP bonding zone, enrichment of residual liquid phase with the positive segregating elements caused formation of intermetallic in the bonding zone. Scanning electron microscopy observation Indicated that the redistribution of alloying elements, between TLP bonding zone and base alloy, resulted In formation of a γ′ boundary layer, containing high density of fine γ′, around the bonding zone....