Microstructural analysis of laser weld fusion zone in Haynes 282 superalloy
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Date
2012
Authors
Osoba, L.O.
Ding, R.G.
Ojo, O.A.
Journal Title
Journal ISSN
Volume Title
Publisher
Materials Characterization
Abstract
Analytical electron microscopy and spectroscopy analyses of the fusion zone (FZ)
microstructure in autogenous laser beam welded Haynes 282 (HY 282) superalloy were
performed. The micro-segregation patterns observed in the FZ indicate that Co, Cr and Al
exhibited a nearly uniform distribution between the dendrite core and interdendritic regions while Ti and Mo were rejected into the interdendritic liquid during the weld solidification. Transmission electron diffraction analysis and energy dispersive X-ray
microanalysis revealed the second phase particles formed along the FZ interdendritic region to be Ti–Mo rich MC-type carbide particles. Weld FZ solidification cracking, which is
sometimes associated with the formation of γ–γ' eutectic in γ' precipitation strengthened
nickel-base superalloys, was not observed in the HY 282 superalloy. Modified primary solidification path due to carbon addition in the newly developed superalloy is used to explain
preclusion of weld FZ solidification cracking in the material.
Description
Keywords
Joining Superalloy Welding
Citation
Osoba, L.O. Ding, R.G. Ojo, O.A. (2012). Microstructural analysis of laser weld fusion zone in Haynes 282 superalloy. Materials Characterization; 65: 93–99.