Heat Input Dependence of Weld HAZ Cracking in Aerospace Superalloy Haynes 282
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The Canadian Society for Mechanical Engineering International Congress
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.
Joining; Laser Welding; Ni based superalloy
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.