TY - JOUR
T1 - Epitaxial deposition of nickel-based superalloy René 142 through scanning laser epitaxy (SLE)
AU - Basak, Amrita
AU - Acharya, Ranadip
AU - Das, Suman
N1 - Funding Information:
This work was sponsored by the Office of Naval Research through grant N00014-11-1-0670 as part of the Cyber-enabled Manufacturing Systems (CeMS) program. The authors would like to thank Bill Carter, GE Global Research for providing the René N5 substrates and Mr. Ron Witt, EBSD Analytical, 2044 N 1100 E Lehi, Utah 84043 for his assistance with EBSD.
Publisher Copyright:
© 2018
PY - 2018/8
Y1 - 2018/8
N2 - Single-pass depositions of columnar René 142 on investment cast single-crystal (SX) René N5 substrates having [100] and [001] primary dendrite growth directions were obtained through scanning laser epitaxy (SLE), a laser powder bed fusion (LPBF)-based additive manufacturing (AM) process. The microstructure and the microhardness properties of the René 142 deposits were investigated through high-resolution optical microscopy (HR-OM), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), x-ray diffraction (XRD), electron backscatter diffraction (EBSD), and micro-hardness measurements. HR-OM investigations revealed the capability of SLE in depositing more than 1000 μm of columnar René 142 in a single pass. SEM investigations demonstrated that the primary γ/γ′ precipitates in the deposit region were 90% finer in size compared to the substrate. XRD investigation revealed the presence of a strong [200] peak and EBSD analysis confirmed SX René 142 growth. Microhardness measurements showed an increase in the hardness values by ∼10% in the deposit region compared to the cast substrate. The results showed that the SLE process has tremendous potential in producing epitaxial deposits of nickel-based superalloys and, therefore, the findings reported in this work can pave ways to fabricate components with dissimilar-chemistry high-γ′ nickel-based superalloys using an LPBF-based AM process.
AB - Single-pass depositions of columnar René 142 on investment cast single-crystal (SX) René N5 substrates having [100] and [001] primary dendrite growth directions were obtained through scanning laser epitaxy (SLE), a laser powder bed fusion (LPBF)-based additive manufacturing (AM) process. The microstructure and the microhardness properties of the René 142 deposits were investigated through high-resolution optical microscopy (HR-OM), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), x-ray diffraction (XRD), electron backscatter diffraction (EBSD), and micro-hardness measurements. HR-OM investigations revealed the capability of SLE in depositing more than 1000 μm of columnar René 142 in a single pass. SEM investigations demonstrated that the primary γ/γ′ precipitates in the deposit region were 90% finer in size compared to the substrate. XRD investigation revealed the presence of a strong [200] peak and EBSD analysis confirmed SX René 142 growth. Microhardness measurements showed an increase in the hardness values by ∼10% in the deposit region compared to the cast substrate. The results showed that the SLE process has tremendous potential in producing epitaxial deposits of nickel-based superalloys and, therefore, the findings reported in this work can pave ways to fabricate components with dissimilar-chemistry high-γ′ nickel-based superalloys using an LPBF-based AM process.
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U2 - 10.1016/j.addma.2018.06.014
DO - 10.1016/j.addma.2018.06.014
M3 - Article
AN - SCOPUS:85049072223
SN - 2214-8604
VL - 22
SP - 665
EP - 671
JO - Additive Manufacturing
JF - Additive Manufacturing
ER -