TY - GEN
T1 - A study on the effects of substrate crystallographic orientation on microstructural characteristics of René N5 processed through scanning laser epitaxy
AU - Basak, Amrita
AU - Das, Suman
N1 - Funding Information:
This work is sponsored by the Office of Naval Research through grants N00014-11-1-0670 and N00014-14-1-0658. The authors would like to thank Mr. Ron Witt, EBSD Analytical, 2044 N 1100 E Lehi, Utah 84043 for his assistance with EBSD Analysis. Disclosures Dr. Suman Das is a cofounder of DDM Systems, a start-up company commercializing SLE technology. Dr. Das and Georgia Tech are entitled to royalties derived from DDM Systems' sale of products related to the research described in this paper. This study could affect their personal financial status. The terms of this arrangement have been reviewed and approved by Georgia Tech in accordance with its conflict of interest policies.
PY - 2016
Y1 - 2016
N2 - In this work, the single-pass fabrication of more than 1000 μm thick René N5, a high γ′ and "non-weldable" single-crystal superalloy on top of investment cast René N5 substrates having 〈100〉 and 〈001〉 crystallographic orientations through scanning laser epitaxy (SLE) was demonstrated. SLE is a powder-bed fusion based additive manufacturing (AM) process that was exclusively developed to repair and manufacture gas turbine hotsection components made of nickel-base superalloys. The microstructures of the René N5 deposits were investigated using optical imaging, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and electron back scatter diffraction (EBSD). Optical microscopy revealed that the substrate crystallographic orientation of 〈100〉 did not prohibit dendritic growth along the 〈001〉 direction in the deposit region. Scanning electron microscopy investigations showed the presence of finer microstructure in the deposit region compared to the substrate region. The crack-free deposits obtained for René N5 represent one of the few successes reported for a "non-weldable" single-crystal superalloy of its kind using powder-bed based AM process.
AB - In this work, the single-pass fabrication of more than 1000 μm thick René N5, a high γ′ and "non-weldable" single-crystal superalloy on top of investment cast René N5 substrates having 〈100〉 and 〈001〉 crystallographic orientations through scanning laser epitaxy (SLE) was demonstrated. SLE is a powder-bed fusion based additive manufacturing (AM) process that was exclusively developed to repair and manufacture gas turbine hotsection components made of nickel-base superalloys. The microstructures of the René N5 deposits were investigated using optical imaging, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and electron back scatter diffraction (EBSD). Optical microscopy revealed that the substrate crystallographic orientation of 〈100〉 did not prohibit dendritic growth along the 〈001〉 direction in the deposit region. Scanning electron microscopy investigations showed the presence of finer microstructure in the deposit region compared to the substrate region. The crack-free deposits obtained for René N5 represent one of the few successes reported for a "non-weldable" single-crystal superalloy of its kind using powder-bed based AM process.
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U2 - 10.1002/9781119075646.ch110
DO - 10.1002/9781119075646.ch110
M3 - Conference contribution
AN - SCOPUS:85008194205
T3 - Proceedings of the International Symposium on Superalloys
SP - 1041
EP - 1049
BT - SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
A2 - Hardy, Mark
A2 - Huron, Eric
A2 - Glatzel, Uwe
A2 - Griffin, Brian
A2 - Lewis, Beth
A2 - Rae, Cathie
A2 - Seetharaman, Venkat
A2 - Tin, Sammy
PB - Minerals, Metals and Materials Society
T2 - 13th International Symposium on Superalloys, SUPERALLOYS 2016
Y2 - 11 September 2016 through 15 September 2016
ER -