Heat Input Dependence of Weld HAZ Cracking in Aerospace Superalloy Haynes 282
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Date
2012
Authors
Osoba, L.O.
Gao, Z.
Ojo, O.A.
Journal Title
Journal ISSN
Volume Title
Publisher
The Canadian Society for Mechanical Engineering International Congress
Abstract
A study of weld heat affected zone (HAZ)
cracking and its dependence on heat input during laser beam
welding of a newly developed γ’ precipitation strengthened
nickel-base superalloy Haynes 282 (HY 282) was carried
out. Careful and detailed microstructural study of the nature
of HAZ cracking in the alloy showed that the cracking is
attributable to degradation of hot ductility of the alloy due to
formation of liquid film along grain boundaries. An increase
in the magnitude of laser heat input resulted in a
considerable reduction in the HAZ cracking. The cracking
variation with heat input is discussed in relation to the time
that the subsolidus HAZ region spent at peak temperatures.
The behavior is also discussed with the results of numerical
simulation, which show that reduction in the magnitude of
thermally induced strain rate gradient may contribute to
reduced HAZ cracking that occurred with an increase in
heat input.
Description
Keywords
Joining; Laser Welding; Ni based superalloy
Citation
Osoba, L.O. Gao, Z. Ojo, O.A. (2012). Heat Input Dependence of Weld HAZ Cracking in Aerospace Superalloy Haynes 282. Proceedings of The Canadian Society for Mechanical Engineering International Congress; Winnipeg, Manitoba, Canada; June 4-6.