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Title: Crystallographic texture control in electron beam additive manufacturing via conductive manipulation

Abstract

Additive manufacturing processes supplement traditional material processing routes with unique capabilities which can have profound impacts on component production. Physical prototyping is accelerated and the fabrication of complex components, difficult or impossible to produce conventionally, is realized. Metals research is often focused on identifying process windows to avoid defects which thereby yield desirable properties. In electron beam melting fusion processes, however, precise spatial control of the heat source allows for detailed microstructure manipulation. Design is therefore extended to the microstructure scale offering greater overall flexibility towards engineering high performance components. In this work the role of geometry and beam path sequencing in a powder bed electron beam melting process is investigated. It is observed that by carefully engineering the melting sequence the morphology and texture at the mesoscale can be controlled. Solidification in the build direction, which usually prefers [001] directions, is tilted by control of the heat flux vector which yields large columnar crystals with a strong [011] build direction preference. This newly developed conduction control strategy is demonstrated for producing alternating mesoscale structures in bulk samples. Furthermore, a new scanning strategy is demonstrated which may be suitable for promoting a randomized crystallographic texture during the additive manufacturing process.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1644213
Alternate Identifier(s):
OSTI ID: 1657980
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Materials & Design
Additional Journal Information:
Journal Name: Materials & Design Journal Volume: 195 Journal Issue: C; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; additive manufacturing; microstructure control; electron beam melting; Ni-based superalloys; solidification

Citation Formats

Fernandez-Zelaia, Patxi, Kirka, Michael M., Dryepondt, Sebastien N., and Gussev, Maxim N. Crystallographic texture control in electron beam additive manufacturing via conductive manipulation. United Kingdom: N. p., 2020. Web. https://doi.org/10.1016/j.matdes.2020.109010.
Fernandez-Zelaia, Patxi, Kirka, Michael M., Dryepondt, Sebastien N., & Gussev, Maxim N. Crystallographic texture control in electron beam additive manufacturing via conductive manipulation. United Kingdom. https://doi.org/10.1016/j.matdes.2020.109010
Fernandez-Zelaia, Patxi, Kirka, Michael M., Dryepondt, Sebastien N., and Gussev, Maxim N. Thu . "Crystallographic texture control in electron beam additive manufacturing via conductive manipulation". United Kingdom. https://doi.org/10.1016/j.matdes.2020.109010.
@article{osti_1644213,
title = {Crystallographic texture control in electron beam additive manufacturing via conductive manipulation},
author = {Fernandez-Zelaia, Patxi and Kirka, Michael M. and Dryepondt, Sebastien N. and Gussev, Maxim N.},
abstractNote = {Additive manufacturing processes supplement traditional material processing routes with unique capabilities which can have profound impacts on component production. Physical prototyping is accelerated and the fabrication of complex components, difficult or impossible to produce conventionally, is realized. Metals research is often focused on identifying process windows to avoid defects which thereby yield desirable properties. In electron beam melting fusion processes, however, precise spatial control of the heat source allows for detailed microstructure manipulation. Design is therefore extended to the microstructure scale offering greater overall flexibility towards engineering high performance components. In this work the role of geometry and beam path sequencing in a powder bed electron beam melting process is investigated. It is observed that by carefully engineering the melting sequence the morphology and texture at the mesoscale can be controlled. Solidification in the build direction, which usually prefers [001] directions, is tilted by control of the heat flux vector which yields large columnar crystals with a strong [011] build direction preference. This newly developed conduction control strategy is demonstrated for producing alternating mesoscale structures in bulk samples. Furthermore, a new scanning strategy is demonstrated which may be suitable for promoting a randomized crystallographic texture during the additive manufacturing process.},
doi = {10.1016/j.matdes.2020.109010},
journal = {Materials & Design},
number = C,
volume = 195,
place = {United Kingdom},
year = {2020},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.matdes.2020.109010

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