Linking thermal history to mechanical behavior in directed energy deposited materials

Jian Cao*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Additive manufacturing is a promising process that has the capability for process optimization and materials development of novel, multi-material and functional components of complex geometries due to the rapid and localized directional solidification of molten metallic alloys. Directed energy deposition, an additive manufacturing process that uses a high powered laser to melt blown metallic powder, introduces large gradients and sensitivity in thermal histories within a built component that lead to unique phase transformations, microstructures, residual stress and anisotropic mechanical behavior. Control of the overall mechanical behavior of DED-built components relies on control of thermal history at localized areas. Research at Northwestern University, in collaboration with Argonne National Laboratory, uses in-situ monitoring techniques such as infrared (IR) cameras, an IR two-wave pyrometer to monitor the melt pool, and a high-powered synchrotron to capture the phase change during build. Relationships between temperature, solidification rate and thermal gradient are made with the resulting microstructural characteristic and mechanical behavior at localized areas of each build. Linking thermal history to mechanical behavior of additively-built parts will lead to increased thermal control for optimal properties and open the door to alloy development.

Original languageEnglish (US)
Title of host publicationMechanics of Additive and Advanced Manufacturing, Volume 8 - Proceedings of the 2018 Annual Conference on Experimental and Applied Mechanics
EditorsSharlotte Kramer, Jay Carroll, Jennifer L. Jordan, Helena Jin, Alison M. Beese
PublisherSpringer Science and Business Media, LLC
Number of pages2
ISBN (Print)9783319950822
StatePublished - 2019
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2018 - Greenville, United States
Duration: Jun 4 2018Jun 7 2018

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


ConferenceSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2018
Country/TerritoryUnited States


  • Additive manufacturing
  • Characterization
  • Directed energy deposition
  • Metal

ASJC Scopus subject areas

  • General Engineering
  • Computational Mechanics
  • Mechanical Engineering


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