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Precipitate Size in GRCop-84 Gas Atomized Powder and Laser Powder Bed Fusion Additively Manufactured Material

A. H. Seltzman, S. J. Wukitch

Fusion Science and Technology / Volume 77 / Number 7-8 / November 2021 / Pages 641-646

Technical Paper / dx.doi.org/10.1080/15361055.2021.1913030

Received:December 16, 2020
Accepted:April 1, 2021
Published:December 2, 2021

Laser powder bed fusion (LPBF), also known as selective laser melting, of Glenn Research Copper 84 (GRCop-84), a Cr2Nb (8 at. % Cr, 4 at. % Nb) precipitation-hardened alloy, produces a fully dense, high-conductivity alloy with tensile strength (470-MPa yield and 710-MPa ultimate tensile strength) superior to other competing copper alloys. Agglomeration and coarsening of precipitates in gas atomized GRCop-84 powder occurred above a threshold of 17 μm in diameter. Area of precipitates within cross sections is consistent among powder particles of different diameters indicating a consistent atomization process. Precipitates within gas atomized powder were shown to either melt and subsequently re-precipitate as the melt pool rapidly cools or break apart during LPBF resulting in precipitates smaller than in the initial powder. Precipitate size in powder therefore does not affect precipitate size, and thus tensile strength, in LPBF GRCop-84.