skip to main content

DOE PAGESDOE PAGES

Title: Powder bed charging during electron-beam additive manufacturing

Electrons injected into the build envelope during powder-bed electron-beam additive manufacturing can accumulate on the irradiated particles and cause them to repel each other. Furthermore, these electrostatic forces can grow so large that they drive the particles out of the build envelope in a process known as smoking. Here, a model of powder bed charging is formulated and used to develop criteria that predict the conditions under which the powder bed will smoke. These criteria suggest dependences on particle size, pre-heat temperature, and process parameters that align closely with those observed in practice.
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility and Materials Science and Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 124; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; additive manufacturing; electron beam welding; powder processing; surface spectroscopy; electrostatics
OSTI Identifier:
1362208
Alternate Identifier(s):
OSTI ID: 1397781