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Title: Location specific solidification microstructure control in electron beam melting of Ti-6Al-4V

Abstract

Relationships between prior beta grain size in solidified Ti-6Al-4V and melting process parameters in the Electron Beam Melting (EBM) process are investigated. Samples are built by varying a machine-dependent proprietary speed function to cover the process space. Optical microscopy is used to measure prior beta grain widths and assess the number of prior beta grains present in a melt pool in the raster region of the build. Despite the complicated evolution of beta grain sizes, the beta grain width scales with melt pool width. The resulting understanding of the relationship between primary machine variables and prior beta grain widths is a key step toward enabling the location specific control of as-built microstructure in the EBM process. Control of grain width in separate specimens and within a single specimen is demonstrated.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1417377
Resource Type:
Journal Article
Resource Relation:
Journal Name: Additive Manufacturing; Journal Volume: 19; Journal Issue: C
Country of Publication:
United States
Language:
ENGLISH
Subject:
42 ENGINEERING; 43 PARTICLE ACCELERATORS

Citation Formats

Narra, Sneha P., Cunningham, Ross, Beuth, Jack, and Rollett, Anthony D.. Location specific solidification microstructure control in electron beam melting of Ti-6Al-4V. United States: N. p., 2018. Web. doi:10.1016/j.addma.2017.10.003.
Narra, Sneha P., Cunningham, Ross, Beuth, Jack, & Rollett, Anthony D.. Location specific solidification microstructure control in electron beam melting of Ti-6Al-4V. United States. doi:10.1016/j.addma.2017.10.003.
Narra, Sneha P., Cunningham, Ross, Beuth, Jack, and Rollett, Anthony D.. Mon . "Location specific solidification microstructure control in electron beam melting of Ti-6Al-4V". United States. doi:10.1016/j.addma.2017.10.003.
@article{osti_1417377,
title = {Location specific solidification microstructure control in electron beam melting of Ti-6Al-4V},
author = {Narra, Sneha P. and Cunningham, Ross and Beuth, Jack and Rollett, Anthony D.},
abstractNote = {Relationships between prior beta grain size in solidified Ti-6Al-4V and melting process parameters in the Electron Beam Melting (EBM) process are investigated. Samples are built by varying a machine-dependent proprietary speed function to cover the process space. Optical microscopy is used to measure prior beta grain widths and assess the number of prior beta grains present in a melt pool in the raster region of the build. Despite the complicated evolution of beta grain sizes, the beta grain width scales with melt pool width. The resulting understanding of the relationship between primary machine variables and prior beta grain widths is a key step toward enabling the location specific control of as-built microstructure in the EBM process. Control of grain width in separate specimens and within a single specimen is demonstrated.},
doi = {10.1016/j.addma.2017.10.003},
journal = {Additive Manufacturing},
number = C,
volume = 19,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}