ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Two models to predict the microstructural evolution and post-weld properties offriction stir welds in aerospace aluminium alloys are presented. The first model is a develop-ment of an existing semi-empirical method for the prediction of hardness profiles after welding,calibrated using isothermal hardness data. Post-weld natural ageing is accounted for, and anew method that predicts natural ageing kinetics is introduced. Once calibrated, the modelis shown to accurately predict weld hardness profiles. However, this model does not explicitlypredict the microstructure and therefore cannot readily be extended to model other properties.It can also only be applied to alloys welded in peak or overaged conditions. The second modelaims to explicitly predict the heterogeneous precipitate distributions obtained after weldingfor any initial condition. It is based on classical kinetic theory and the numerical frameworkof Kampmann and Wagner. Multiple nucleation sites and multiple phases are accounted for.This model provides detailed microstructural information required for prediction of complexproperties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1101.pdf
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