6533b857fe1ef96bd12b46c7

RESEARCH PRODUCT

FEM based prediction of phase transformations during Friction Stir Welding of Ti6Al4V titanium alloy

Gianluca BuffaAntonino DucatoLivan Fratini

subject

Plastic weldingMaterials scienceMechanical EngineeringMetallurgyTitanium alloyWeldingCondensed Matter PhysicsElectric resistance weldinglaw.inventionFusion weldingFrictionStirWelding Titanium alloys FEM model Phase transformationMechanics of MaterialslawFriction stir weldingGeneral Materials ScienceFriction weldingEmbrittlement

description

Abstract Friction Stir Welding (FSW) is a solid state welding process patented in 1991 by TWI; initially adopted to weld aluminum alloys, it is now being successfully used also for high resistant materials. Welding of titanium alloys by traditional fusion welding techniques presents several difficulties due to high material reactivity with oxygen, hydrogen, and nitrogen with consequent embrittlement of the joint. In this way FSW represents a cost effective and high quality solution. The final mechanical properties of the joints are strictly connected to the microstructural evolutions, in terms of phase change, occurring during the process. In the paper a 3D FEM model of the FSW welding process, based on a thermo-mechanical fully coupled analysis, is presented. The model, tuned both for the thermo-mechanical analysis and the phase transformation through experimental data, is able to predict the phase volume fraction in the typical zones of the joints at the varying of the main process parameters. The obtained results permit to assess that the tuned FEM model of the FSW process can be utilized as an effective design tool.

yearjournalcountryeditionlanguage
2013-10-01Materials Science and Engineering: A
https://doi.org/10.1016/j.msea.2013.06.009