Eng
Ukr
Rus
Print
2018 №06 (06) DOI of Article
10.15407/tpwj2018.06.01
2018 №06 (02)

The Paton Welding Journal 2018 #06
TPWJ, 2018, #6, 2-8 pages
 
Evolution of structure of oxide dispersion strengthened nickel alloys in fusion welding


Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                      0957-798X (print)
Issue                       #6, 2018 (June)
Pages                      2-8
 
 
Authors
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
 
 
References
  1. Gessinger, G.Kh. (1988) Powder metallurgy of high-temperature alloys. Chelyabinsk, Metallurgiya, Chelyab. Div. [in Russian].
  2. Valiev, F.Z., Aleksandrov, I.V. (2007) Volumetric nanostructured metallic materials: Production, structure and properties. Moscow, IKTs Akademkniga [in Russian].
  3. Chebryakova, E.V. (2011) Peculiarities of mechanism of strengthening of metal matrices with nanoparticles of refractory compounds. In: of All-Russian Conf. on Nanomaterials NANO 2011. Moscow, IMET RAN [in Russian].
  4. Gusev, A.I. (1998) Effect of nanostructural state in compact metals and joints. Uspekhi Fiz. Nauk, 168, 29–58 [in Russian].
  5. Soni, P.R. (2000) Mechanical alloying: Fundamentals and applications. Cambridge, Cambridge Int. Sci. Publ.
  6. He, X.D., Xin, Y., Li, M.W., Sun, Y. (2009) Microstructure and mechanical properties of ODS-Ni-based superalloy foil produced by EB-PVD. of Alloys and Compounds, 467(1–2), 347. https://doi.org/10.1016/j.jallcom.2007.11.122
  7. Gleiter, H. (2000) Nanostructured materials. Basic concepts and microstructure. Acta Mater., 48(1), 1–29. https://doi.org/10.1016/S1359-6454(99)00285-2
  8. Andrievsky, R.A., Glezer, A.M. (1999) Size effects in nanocrystalline materials. Peculiarities of structure. Fizika Metallov i Metallovedenie, 88(1), 50–73 [in Russian].
  9. Rebinder, P.A. (1958) Physicochemical mechanics. Moscow [in Russian].
  10. Janko, B. (1986) High-temperature alloys for gas turbines and other application. Brussels, D. Ridee.
  11. Kondrik, A.I., Kovtun, G.P., Datsenko, O.A. et al. (2008) Modern materials for thermonuclear power engineering. Kharkov, NNTsKhPTI [in Russian].
  12. Azerenkov, N.A., Kovtun, G.P., Litovchenko, S.V. (2009) Nanotekhnologies and nanomaterials in nuclear power engineering. In: of Int. Scient. Conf. on Physicochemical Principles of Formation and Modification of Micro- and Nanostructures. FMMN, Zbirnyk Nauk. Prats. Kharkiv, NFTTsMON ta NANU, 2009, 152–157.
  13. Kovtun, G.P., Verevkin, A.A. (2010) Nanomaterials: Technologies and materials science (Review). Kharkov, NNTs KhPTI [in Russian].
  14. Howard, S.M., Jasthi, DB, K., Arbegast, W.J. et al. (2004) Friction stir welding of MA957 oxide dispersion strengthened ferritic steel. In: Fusion materials semiannual progress report for the period ending. December 31, 55–60.
  15. Hemilton, M.L. et al. (2000) Fabrication technology for ODS alloy MA957, PNL-13165.
  16. Shinozaki, K et al. (1997) Metallurgical and mechanical properties of ODS alloy MS956 friction welds. Welding J., 76(8), 289–299.
  17. Feng, Z., Ren, W. (2006) Initial development in joining of ODS alloys using friction stir welding. Report No. ORNL/GEN4LTR-06-021.
  18. Portnoj, K.I., Babich, V.N. (1974) Dispersion-hardened materials. Moscow, Metallurgiya [in Russian].
  19. Kelly, A., Nicholson, R. (1966) Dispersion hardening. Moscow, Metallurgiya [in Russian].

>