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2018 №06 (06) DOI of Article
10.15407/tpwj2018.06.01 		2018 №06 (02)

The Paton Welding Journal 2018 №06


The Paton Welding Journal, 2018, #6, 2-8 pages
 

Evolution of structure of oxide dispersion strengthened nickel alloys in fusion welding

K.A. Yushchenko, B.A. Zadery, I.S. Gakh, A.V. Zvyagintseva, L.M. Kapitanchuk and V.Yu. Khaskin


E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
 
Changes of nanodispersed structure of nickel ODS-alloys as a result of fusion welding were considered. Welded joints, produced at different modes of argonarc, electron beam and laser welding were investigated. It is shown that degradation of nanosized structure takes place in all considered cases. It is expressed mainly in change of strengthening particles up to microsized level, some variation of their chemical composition and morphology. A level of structure degradation depends on a level of overheating of weld pool metal, which in turn, is determined by value of specific power of heat source, welding rate, heat input and cooling nature. It is shown that the positive result, i.e minimum degradation of initial metal nanostructure, can be reached at optimum combination of the maximum technologically acceptable welding rate and heat input concentration, minimum margin and controlled distribution of power, which provide through penetration and formation of weld with parallel fusion surfaces. 19 Ref., 9 Figures.

Keywords: ODS-nickel alloys, fusion welding, weld pool, degradation of nanodispersed structure, particle coarsening, welding rate, heat input nature, weld formation
 
Received:                12.04.18
Published:               05.07.18
 
 
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