Microstructural evolution of brazed inconel 625 using amorphous VZ-2106 foil
Journal
ISIJ International
Journal Volume
53
Journal Issue
5
Pages
923-925
Date Issued
2013
Author(s)
Abstract
The article examines the micro-structural evolution of brazed Inconel 625 using amorphous VZ-2106 foil. Cross-sections of brazed joints were cut by a low-speed diamond saw, and examined by using JEOL JSM 6510 scanning electron microscope (SEM). Quantitative chemical analyses of selected areas of the brazed joint were carried out by using JEOL 8600SX electron probe micro-analyzer (EPMA) equipped with the wavelength dispersive spectroscope (WDS) position of F is located in grain boundary of IN-625 substrate. Based on the EPMA chemical analysis result, the grain boundary boride is mainly comprised of B, Cr, Ni and Mo. It has been reported that the solubility of boron in austenitic matrix is very low, and boron can easily segregate along the grain boundary to form boride precipitates upon cooling cycle of heat treatment. It is consistent with the experimental observation that Ni/Cr/Fe matrix is alloyed with 5.7 at% silicon but no boron.
Type
journal article