The linear friction welding technique allows one to extend the applications of traditional rotary friction welding to non-axisymmetrical components. This welding process is therefore seen as an alternative means of manufacturing and repairing components for turbine engines and can be used to obtain a single component known as a blisk (blade + disk) that is considerably lighter, which is beneficial to its application in the aeronautics industry. In view of process optimization, the objective of this work was to apply a new methodology, based upon finite element modeling techniques, in order to obtain correlations between hardness and mechanical properties such as the elastic limit, the Young's modulus and the strain hardening coefficient. The evolution of those properties is analyzed in relation to microstructural changes in the heat affected zone (HAZ) of welds carried out on Ti alloys. The alloy selected for the manufacture of the disk was Ti-6Al-2Sn-4Zr-6Mo (Ti-6246). It was cast in disk form, forged in the beta region (beta-transus of 945 deg C) and then heat-treated. The alloys used for the blades were Ti-6Al-4V (Ti-64) and Ti-6Al-2Sn-4Zr-2Mo (Ti-6242), forged at alpha+beta and then heat-treated under different conditions. In order to study the variation in mechanical properties in relation to the distance from the weld, indentation tests were carried out as well as tensile and hardness tests. Simulations with the Finite Element Methode and iterative methods to obtain mechanical properties and influences of the friction coefficient on the properties obtained are described. Microstructural changes (phase transformation) in the weld, the base metal and the HAZ were characterized with with SEM. As it demonstrates a reasonable correspondence between numerical and experimental results, the investigation reveals that the indentation methodology constitutes a very useful tool to evaluate the uniaxial properties of linear friction welded joints between titanium alloys subject to traction.
Mechanical evaluation of linear friction welds in titanium alloys through indentation experiments
Welding International ; 21 , 2 ; 125-129
2007
5 Seiten, 9 Bilder, 3 Tabellen, 12 Quellen
Article (Journal)
English
Reibschweißen , Magnesiumlegierung , Turbinenbau , Leichtbauweise , Luftfahrtindustrie , Härteeindruck , mechanische Eigenschaft , Finite-Elemente-Methode , Fließkurve , Phasenumwandlung , Wärmebehandlung (Materialbearbeitung) , Reibungskoeffizient , Iterationsverfahren , Schweißzone , Theorie-Experiment-Vergleich , Titanaluminiumvanadiumlegierung
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