NDLI: Evolution and control of 2219 aluminum microstructural features through electron beam freeform fabrication

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Evolution and control of 2219 aluminum microstructural features through electron beam freeform fabrication

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hafley, Robert A. Taminger, Karen M. Domack, Marcia S.
Copyright Year	2006
Description	The layer-additive nature of the electron beam freeform fabrication (EBF3) process results in a tortuous thermal path producing complex microstructures including: small homogeneous equiaxed grains; dendritic growth contained within larger grains; and/or pervasive dendritic formation in the interpass regions of the deposits. Several process control variables contribute to the formation of these different microstructures, including translation speed, wire feed rate, beam current and accelerating voltage. In electron beam processing, higher accelerating voltages embed the energy deeper below the surface of the substrate. Two EBF3 systems have been established at NASA Langley, one with a low-voltage (10-30kV) and the other a high-voltage (30-60 kV) electron beam gun. Aluminum alloy 2219 was processed over a range of different variables to explore the design space and correlate the resultant microstructures with the processing parameters. This report is specifically exploring the impact of accelerating voltage. Of particular interest is correlating energy to the resultant material characteristics to determine the potential of achieving microstructural control through precise management of the heat flux and cooling rates during deposition.
File Size	977066
Page Count	13
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20060010993
Archival Resource Key	ark:/13960/t48q1095f
Language	English
Publisher Date	2006-03-01
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Fabrication Electric Potential Cooling Electron Beams Dendritic Crystals Aluminum Alloys Microstructure Heat Flux Beam Currents Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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