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Grain Refinement of Freeform Fabricated Ti-6Al-4V Alloy Using Beam/Arc Modulation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mitzner, Scott Vogel Liu, Stephen Z. Domack, Marcia S. Hafley, Robert A. |
| Copyright Year | 2012 |
| Abstract | Grain 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 (EBF 3 ) and gastungsten 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. a Colorado School of Mines, Golden, CO b NASA Langley Research Center, Hampton, VA |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120014597.pdf |
| Alternate Webpage(s) | http://sffsymposium.engr.utexas.edu/Manuscripts/2012/2012-42-Mitzner.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
