Microstructure development in copper welded by the FSW-Process
2004 (English)In: SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVII / [ed] Oversby VM, Werme LO, Warrendale: Materials Research Society , 2004, Vol. 807, 483-488 p.Conference paper (Refereed)
To ensure safe storage of nuclear fuel waste, copper canisters are proposed as corrosion barrier. One alternative for sealing the copper canisters is Friction Stir Welding (FSW). During the joining process friction heat and mechanical deformation appear between the rotating tool and the material being welded. Liquid metal will not form, since this is a solid state welding process. Three distinct microstructural zones are developed namely the nugget, the thermomechanically affected zone (TMAZ) and heat-affected zone (HAZ). The nugget is in the centre of the weld, where the pin is located and where severe plastic deformation occurs that leads to recrystallisation. Surrounding the nugget, the TMAZ is only partially recrystallised, due to lower temperature increase and deformation compared to the nugget. The third zone, HAZ, surrounds the TMAZ. The initial nugget can have a classic round aluminium nugget image, when the welding conditions are cold, but the steady state nugget, is wider near the shoulder and shorter in the weld root.
Place, publisher, year, edition, pages
Warrendale: Materials Research Society , 2004. Vol. 807, 483-488 p.
, Materials Research Society Symposium Proceedings, ISSN 0272-9172 ; 807
Materials Science, Multidisciplinary
IdentifiersURN: urn:nbn:se:kth:diva-12008ISI: 000225038400079ScopusID: 2-s2.0-12844266096ISBN: 1-55899-752-0OAI: oai:DiVA.org:kth-12008DiVA: diva2:293990
27th Symposium on Scientific Basis for Nuclear Waste Management Kalmar, SWEDEN, JUN 15-19, 2003
QC 201007162010-02-152010-02-152011-10-31Bibliographically approved