Cracking Susceptibility After Post-Weld Heat Treatment in Haynes 282 Nickel Based Superalloy
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Date
2013
Authors
Osoba, L.O.
Khan, A.K.
Adeosun, S.O.
Journal Title
Journal ISSN
Volume Title
Publisher
Acta Metall. Sin. (Engl. Lett.)
Abstract
This paper presents a study of the standard post-weld heat treatment (PWHT) behaviour of autogenous laser
welded γ’ age-hardenable precipitation strengthened nickel based superalloy Haynes 282 (HY 282). The study
involves a careful and detailed microstructural characterisation as well as an analysis of the weld cracking
susceptibility during welding and Gleeble thermo-mechanical physical simulation. Various factors that could
influence post-weld cracking in superalloys weld were experimentally examined. Our microstructural examination of the as-solution heat treated (SHTed) material and the thermo-mechanically refined grain material
shows that intergranular heat affected zone (HAZ) cracking is observable in only the as-welded SHTed material. There was no indication of post-weld heat treatment cracking in all welded materials. Our conclusion, in
this study, is that the chemistry of superalloy HY 282 which aids the preclusion/ formation of deleterious solidification microconstituents during welding as well as its relatively slow aging kinetics enhances its resistance
to PWHT cracking.
Description
Keywords
Cracking; Microstructure Analysis; Nickel based Superalloy
Citation
Osoba, L.O. Khan, A.K. Adeosun, S.O. (2013). Cracking Susceptibility After Post-Weld Heat Treatment in Haynes 282 Nickel Based Superalloy. Acta Metall. Sin. (Engl. Lett.); 26(6): 747—753.