NDLI: Grain refinement of freeform fabricated ti-6al-4v alloy using beam/arc modulation

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Grain refinement of freeform fabricated ti-6al-4v alloy using beam/arc modulation

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hafley, Robert A. Mitzner, Scott Liu, Stephen Domack, Marcia S.
Copyright Year	2012
Description	Grain refinement can significantly improve the mechanical properties of freeform-fabricated Ti-6Al-4V alloy, promoting increased strength and enhanced isotropy compared with coarser grained material. Large beta-grains can lead to a segregated microstructure, in regard to both alpha-phase morphology and alpha-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 (EBF(sup 3)) 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.
File Size	2333321
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20120014597
Archival Resource Key	ark:/13960/t5hb44591
Language	English
Publisher Date	2012-08-06
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Grain Size Fabrication Isotropy Titanium Alloys Vanadium Alloys Mechanical Properties Aluminum Alloys Solidification Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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