Characterization and Rationalization of Microstructural Evolution in GRCop-84 Processed by Laser-Powder Bed Fusion (L-PBF)

Minneci, Robert P.; Haines, Michael P.; Gradl, Paul R.; Ellis, David L.; Lass, Eric A.; Bunn, Jeffrey R.; Choo, Hahn; Jones, Zachary C.; Babu, Sudarsanam S.; Rawn, Claudia J.

doi:10.1007/s11661-024-07315-w

Title: Characterization and Rationalization of Microstructural Evolution in GRCop-84 Processed by Laser-Powder Bed Fusion (L-PBF)

Journal Article · 27 February 2024 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI: https://doi.org/10.1007/s11661-024-07315-w · OSTI ID:2351086

Minneci, Robert P. ^[1]; Haines, Michael P. ^[1]; Gradl, Paul R. ^[2]; Ellis, David L. ^[3]; Lass, Eric A. ^[1]; Bunn, Jeffrey R. ^[4]; Choo, Hahn ^[1]; Jones, Zachary C. ^[2]; Babu, Sudarsanam S. ^[5]; Rawn, Claudia J. ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)
NASA Glenn Research Center, Cleveland, OH (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

In this study, prismatic geometries of GRCop-84 [Cu-8Cr-4Nb (at. pct)] were built with laser-powder bed fusion (L-PBF) process. The samples were sectioned parallel or perpendicular to the build direction and characterized in the as-built and after post-processing with a hot-isostatically pressing (HIP) treatment. The microstructure and phase evolutions were evaluated with optical microscopy, scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), and high-temperature X-ray diffraction (HTXRD) up to 1223 K. The samples in the as-built conditions exhibited predominantly columnar epitaxial and misoriented Cu-FCC grains. The microstructure evolutions are discussed based on locations within the overall build geometry, the dynamics of small melt pool shape and sectioning effects. The above grain structure did not change significantly during post-process HIP treatment. The stability of this FCC grain structure is attributed to the formation of primary stable Cr₂Nb (Laves phase) during L-PBF, even before the emergence of FCC grains from liquid. The stability of Cr₂Nb in both as-built and HIPed samples were evaluated using high-temperature X-ray diffraction measurements and compared with that of gas-atomized powder. The significance of these results is discussed with reference to aerospace applications.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2351086

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 5 Vol. 55; ISSN 1073-5623

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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