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Electron-beam additive manufacturing of high-temperature metals

Published online by Cambridge University Press:  10 October 2016

Lawrence E. Murr  and
Shujun Li
Lawrence E. Murr
Affiliation:
Department of Metallurgical, Materials and Biomedical Engineering, The University of Texas at El Paso, USA; [email protected]
Shujun Li
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, China; [email protected]
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Abstract

This article overviews electron-beam melting (EBM), including process optimization issues. Examples of EBM-fabricated components described include hexagonal close-packed Ti-6Al-4V, face-centered-cubic René 142 (a Ni-based superalloy), and body-centered-cubic pure iron, corresponding to a melt temperature range from 1375°C to 1630°C. Residual microstructures observed for these fabricated components by optical microscopy, scanning electron microscopy, and transmission electron microscopy include equilibrium as well as nonequilibrium features, which illustrate prospects for novel structure–property manipulation in the EBM process. The EBM process relies on available pre-alloyed, precursor powders that are selectively melted layer by layer by a computer-aided design scanned electron beam to form relatively small, but often complex, products or components. Direct metal deposition innovations capable of truly three-dimensional metal printing are described, especially high-temperature metals and alloys for future additive manufacturing technologies.

Keywords

electron-beam meltinghigh-temperature metalsmicrostructures
Type
Research Article
Information
MRS Bulletin , Volume 41 , Issue 10: Metallic materials for 3D printing , October 2016 , pp. 752 - 757
Copyright
Copyright © Materials Research Society 2016 

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