Precipitation and dissolution of delta and gamma-double-prime during heat treatment of a laser powder-bed fusion produced Ni-based superalloy
Eric Lass, Mark R. Stoudt, Maureen E. Williams, Michael B. Katz
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.
, Stoudt, M.
, Williams, M.
and Katz, M.
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 September 30, 2023)