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Title: The effects of material anisotropy on secondary processing of additively manufactured CoCrMo

Abstract

Components produced by near net shape additive manufacturing processes often require subsequent subtractive finishing operations to satisfy requisite surface finish and geometric tolerances. It is well established that the microstructure and properties of the as-built component are sensitive to the additive processing history. Therefore, downstream secondary processes may be affected by the as-built components’ mechanical behavior. In this work we study the sensitivity of secondary machining operations on CoCrMo samples produced via laser powder bed fusion. Utilizing novel high-throughput mechanical testing, microstructure characterization, and a rigorous statistical analysis we investigate the degree of material anisotropy present in the as-built material. We then study the effects of this anisotropy on secondary processing via slot milling experiments. Our results indicate that mechanical anisotropy is driven by both the morphology of the microstructure as well as crystallographic texture. Furthermore, the machining force response is correspondingly sensitive to these sources of anisotropy, which has the potential to impact how manufacturers finish additively built parts.

Authors:
 [1];  [2];  [2];  [3];  [2]
+ Show Author Affiliations
  1. Georgia Inst. of Technology, Atlanta, GA (United States); Oak Ridge National Lab. (ORNL), Knoxville, TN (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1558500
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Additive Manufacturing
Additional Journal Information:
Journal Volume: 29; Journal Issue: C; Journal ID: ISSN 2214-8604
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Additive manufacturing; Anisotropy; Milling; Indentation; Crystallography

Citation Formats

Fernandez-Zelaia, Patxi, Nguyen, Vinh, Zhang, Hayley, Kumar, Arkadeep, and Melkote, Shreyes N. The effects of material anisotropy on secondary processing of additively manufactured CoCrMo. United States: N. p., 2019. Web. doi:10.1016/j.addma.2019.06.015.
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Fernandez-Zelaia, Patxi, Nguyen, Vinh, Zhang, Hayley, Kumar, Arkadeep, & Melkote, Shreyes N. The effects of material anisotropy on secondary processing of additively manufactured CoCrMo. United States. https://doi.org/10.1016/j.addma.2019.06.015
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Fernandez-Zelaia, Patxi, Nguyen, Vinh, Zhang, Hayley, Kumar, Arkadeep, and Melkote, Shreyes N. Fri . "The effects of material anisotropy on secondary processing of additively manufactured CoCrMo". United States. https://doi.org/10.1016/j.addma.2019.06.015. https://www.osti.gov/servlets/purl/1558500.
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@article{osti_1558500,
title = {The effects of material anisotropy on secondary processing of additively manufactured CoCrMo},
author = {Fernandez-Zelaia, Patxi and Nguyen, Vinh and Zhang, Hayley and Kumar, Arkadeep and Melkote, Shreyes N.},
abstractNote = {Components produced by near net shape additive manufacturing processes often require subsequent subtractive finishing operations to satisfy requisite surface finish and geometric tolerances. It is well established that the microstructure and properties of the as-built component are sensitive to the additive processing history. Therefore, downstream secondary processes may be affected by the as-built components’ mechanical behavior. In this work we study the sensitivity of secondary machining operations on CoCrMo samples produced via laser powder bed fusion. Utilizing novel high-throughput mechanical testing, microstructure characterization, and a rigorous statistical analysis we investigate the degree of material anisotropy present in the as-built material. We then study the effects of this anisotropy on secondary processing via slot milling experiments. Our results indicate that mechanical anisotropy is driven by both the morphology of the microstructure as well as crystallographic texture. Furthermore, the machining force response is correspondingly sensitive to these sources of anisotropy, which has the potential to impact how manufacturers finish additively built parts.},
doi = {10.1016/j.addma.2019.06.015},
journal = {Additive Manufacturing},
number = C,
volume = 29,
place = {United States},
year = {Fri Jun 28 00:00:00 EDT 2019},
month = {Fri Jun 28 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.addma.2019.06.015
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Cited by: 17 works
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Figures / Tables:

Figure 1 Figure 1: AM sample coordinates and sectioning planes. The indentation experimental schematic and the corresponding indentation samples with their orientations relative to the original build direction (BD) as shown.
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