Avtomaticheskaya Svarka (Automatic Welding), # 6, 2018, pp. 3-11
Evolution of structure of nickel oxide dispersion
strengthened alloys in fusion welding
K. A. Yushchenko, B. A. Zaderii, I. S. Gakh, A. V. Zvyagintseva,
L. M. Kapitanchuk, Yu. V. Khaskin
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine.
Change of nanodispersed structure of nickel OSD-alloys as a result of fusion welding was considered. Welded joints, produced at different modes of argon-arc, electron beam and laser welding, were investigated. It is shown that degradation of nanosized structure takes place in all considered cases. It 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, 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 Fig.
: OSD-nickel alloys, fusion welding, weld pool, degradation of nanodispersed particles, welding rate, heat input nature, weld formation
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