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Precipitation and dissolution of delta and gamma-double-prime during heat treatment of a laser powder-bed fusion produced Ni-based superalloy

Published

Author(s)

Eric Lass, Mark R. Stoudt, Maureen E. Williams, Michael B. Katz

Abstract

One drawback of the laser powder-bed fusion additive manufacturing (AM) technique is the build-up of residual stresses during processing that require a stress-relief heat treatment prior to components being removed from the build plate. Here, we demonstrate the coprecipitation of the gamma-double-prime-phase alongside the known delta-phase, during stress-relief annealing of AM Inconel 625 at 870 °C. The unexpected precipitation of gamma-double-prime in the AM material is attributed to the local solute enrichment to the interdendritic regions of the as-built solidification microstructure. Dissolution of the delta and gamma-double-prime phases is achieved after annealing for 15 min at 1150 °C.
Citation
Scripta Materialia
Volume
154

Keywords

Additive manufacturing, Ni-based alloys, Inconel 625

Citation

Lass, E. , Stoudt, M. , Williams, M. and Katz, M. (2018), Precipitation and dissolution of delta and gamma-double-prime during heat treatment of a laser powder-bed fusion produced Ni-based superalloy, Scripta Materialia, [online], https://doi.org/10.1016/j.scriptamat.2018.05.025 (Accessed August 16, 2022)
Created June 8, 2018, Updated November 10, 2018