Grain Refinement of Freeform Fabricated Ti-6Al-4V Alloy Using Beam/Arc Modulation

dc.creatorMitzner, Scott
dc.creatorLiu, Stephen
dc.creatorDomack, Marcia
dc.creatorHafley, Robert
dc.date.accessioned2021-10-06T20:30:23Z
dc.date.available2021-10-06T20:30:23Z
dc.date.issued2012
dc.description.abstractGrain refinement can significantly improve the mechanical properties of freeform-fabricated Ti6Al-4V alloy, promoting increased strength and enhanced isotropy compared with coarser grained material. Large β-grains can lead to a segregated microstructure, in regard to both αphase morphology and α-lath orientation. Beam modulation, which has been used in conventional fusion welding to promote grain refinement, is explored in this study for use in additive manufacturing processes including electron beam freeform fabrication (EBF3) and gas-tungsten arc (GTA) deposition to alter solidification behavior and produce a refined microstructure. The dynamic molten pool size, induced by beam modulation causes rapid heat flow variance and results in a more competitive grain growth environment, reducing grain size. Consequently, improved isotropy and strength can be achieved with relatively small adjustments to deposition parameters.en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/88435
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/15372
dc.language.isoengen_US
dc.publisherUniversity of Texas at Austinen_US
dc.relation.ispartof2012 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectTi-6Al-4V alloyen_US
dc.subjectgrain refinementen_US
dc.subjectelectron beamen_US
dc.subjectgas-tungsten arcen_US
dc.subjectfreeform fabricationen_US
dc.titleGrain Refinement of Freeform Fabricated Ti-6Al-4V Alloy Using Beam/Arc Modulationen_US
dc.typeConference paperen_US

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