In the powder-based electron beam additive manufacturing (EBAM) process, preheating is applied, prior to the melting stage, to aggregate precursor powders and to reduce the residual stresses in the build parts. Preheating results in sintering of the powders, which serve as the initial work material for the subsequent melting stage. In this study, sintered Ti-6Al-4V alloy powders from preheating were obtained and studied. The specimens of sintered powders, also processed to prepare metallographic samples, were observed and characterized by optical microscopy (OM) and scanning electron microscopy (SEM). The results show that after preheating, some powders are partially “melted” and necks between adjacent particles are formed with metallurgical bonds. The sintering evidence, necking, can be noted on both the build plane and the side surface (normal to the build plane). The Baktetwave α-β structure is identified in the powders, while the martensitic structure is formed in the solid EBAM part.
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ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference
June 10–14, 2013
Madison, Wisconsin, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-5545-4
PROCEEDINGS PAPER
Characterization of Sintered Ti-6Al-4V Powders in Electron Beam Additive Manufacturing
Xibing Gong
,
Xibing Gong
The University of Alabama, Tuscaloosa, AL
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Kevin Chou
Kevin Chou
The University of Alabama, Tuscaloosa, AL
Search for other works by this author on:
Xibing Gong
The University of Alabama, Tuscaloosa, AL
Kevin Chou
The University of Alabama, Tuscaloosa, AL
Paper No:
MSEC2013-1131, V001T01A002; 8 pages
Published Online:
November 27, 2013
Citation
Gong, X, & Chou, K. "Characterization of Sintered Ti-6Al-4V Powders in Electron Beam Additive Manufacturing." Proceedings of the ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. Volume 1: Processing. Madison, Wisconsin, USA. June 10–14, 2013. V001T01A002. ASME. https://doi.org/10.1115/MSEC2013-1131
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