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Title: Additively manufactured tantalum microstructures

Abstract

Additively manufacturing tantalum is a challenging process in which obstacles are stemming from the high melting temperature and susceptibility to oxidation of tantalum. In this paper, several combinations of deposition parameters were considered in an effort to obtain fully dense additively manufactured tantalum produced on an EOSINT M280 DMLS system. Deposition parameters significantly affect the resulting microstructure of additively manufactured tantalum, altering grain morphology, grain size, crystallographic preferred orientation, and deposition porosity. Due to the nature of the laser sintering process applied, which implies large directional temperature gradients, the resulting microstructures were strongly columnar along the building direction. Microstructural differences for different deposition conditions manifested themselves in both grain morphology and preferred crystal orientations in the columnar grains. Deposition speed and laser power were important parameters to consider for obtaining porosity-free material. Finally, stripe width had the most significant effect on grain growth.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1459835
Report Number(s):
LA-UR-18-22425
Journal ID: ISSN 2589-1529
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Materialia
Additional Journal Information:
Journal Volume: 1; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; additive manufacturing; tantalum; texture

Citation Formats

Livescu, Veronica, Knapp, Cameron M., Gray, George T., Martinez, Ramon M., Morrow, Benjamin M., and Ndefru, Bineh G. Additively manufactured tantalum microstructures. United States: N. p., 2018. Web. doi:10.1016/j.mtla.2018.06.007.
Livescu, Veronica, Knapp, Cameron M., Gray, George T., Martinez, Ramon M., Morrow, Benjamin M., & Ndefru, Bineh G. Additively manufactured tantalum microstructures. United States. doi:10.1016/j.mtla.2018.06.007.
Livescu, Veronica, Knapp, Cameron M., Gray, George T., Martinez, Ramon M., Morrow, Benjamin M., and Ndefru, Bineh G. Wed . "Additively manufactured tantalum microstructures". United States. doi:10.1016/j.mtla.2018.06.007. https://www.osti.gov/servlets/purl/1459835.
@article{osti_1459835,
title = {Additively manufactured tantalum microstructures},
author = {Livescu, Veronica and Knapp, Cameron M. and Gray, George T. and Martinez, Ramon M. and Morrow, Benjamin M. and Ndefru, Bineh G.},
abstractNote = {Additively manufacturing tantalum is a challenging process in which obstacles are stemming from the high melting temperature and susceptibility to oxidation of tantalum. In this paper, several combinations of deposition parameters were considered in an effort to obtain fully dense additively manufactured tantalum produced on an EOSINT M280 DMLS system. Deposition parameters significantly affect the resulting microstructure of additively manufactured tantalum, altering grain morphology, grain size, crystallographic preferred orientation, and deposition porosity. Due to the nature of the laser sintering process applied, which implies large directional temperature gradients, the resulting microstructures were strongly columnar along the building direction. Microstructural differences for different deposition conditions manifested themselves in both grain morphology and preferred crystal orientations in the columnar grains. Deposition speed and laser power were important parameters to consider for obtaining porosity-free material. Finally, stripe width had the most significant effect on grain growth.},
doi = {10.1016/j.mtla.2018.06.007},
journal = {Materialia},
number = ,
volume = 1,
place = {United States},
year = {2018},
month = {7}
}

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