| 2006 №02 (04) | 2006 №02 (06) |
The Paton Welding Journal, 2006, #2, 20-25 pages
Effect of scandium additions on fine structure of weld metal in aluminium alloy 1460 welded joints
L.I. Markashova, G.M. Grigorenko, A.Ya. Ishchenko, A.V. Lozovskaya, O.S. Kushnaryova
E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.Abstract
Peculiarities of structure-phase condition of metal of the welds and welded joints made on alloy 1460 by argon-arc welding using standard filler wire Sv1201 and experimental wire 1201 with an addition of scandium were studied by transmission electron microscopy. Main structural changes caused by adding scandium are characterised by grain refining, increase in volume density of dislocations, formation of fine inclusions containing scandium, and activation of solid solution decomposition processes.
Keywords: arc welding, aluminium alloy, scandium alloying, weld metal, fine structure, phase precipitates, eutectic, dislocation density
References
1. Bernshtejn, M.L. (1965) Mechanisms of strengthening of solids. Moscow: Metallurgiya.2. Eshbi, I.F. (1972) About Orowan stress. In: Physics of strength and ductility. Moscow: Metallurgiya.
3. Honeycomb, R. (1972) Plastic deformation of metals. Moscow: Mir.
4. Kosik, J., Abson, D.J., Jonas, J.J. (1971) Strengthening effect of hotwork subgrains at room temperature. J. Iron and Steel Inst., 209(8), 624–629.
5. Embury, J.D. (1982) Ductile fracture, strength of metals and alloys (ICSMA6). In: Proc. of 6th Int. Conf. (Melbourne, Aug. 16–20, 1982). Vol. 3. Melbourne.
6. Ivanova, V.S., Gordienko, L.K., Geminov, V.N. et al. (1965) Role of dislocations in strengthening and fracture of metals. Moscow: Nauka.
7. Gordienko, L.K. (1973) Substructural strengthening of metals and alloys. Moscow: Nauka.
8. Berezina, A.L., Kolobnev, N.I., Molebny, O.A. (2001) Effect of Sc and Zr on structure and properties of Al-Cu-Li alloys depending on copper concentration. Metallofiz. Nov. Tekhnologii, 23(11), 1531–1539.
9. Berezina, A.L., Shmidt, U., Monastyrskaya, T.A. et al. (2002) Structural transformations in rapidly quenched binary Al-Sc alloys. Ibid., 24(2), 221–234.
10. Darovsky, Yu.F., Markashova, L.I., Abramov, N.P. et al. (1985) Method of preparation for electron microscopy analysis. Avtomatich. Svarka, 12, 60.
11. Dumolt, S.D., Laflin, D.E., Williams, J.K. (1984) Influence of welding on microstructure of heat-treated alloy 2219. Kiev: Naukova Dumka.
12. Ishchenko, A.Ya. (2004) Peculiarities of application of highstrength aluminium alloys for welded structures. The Paton Welding J., 9, 15–25.