Simulation and experimental analysis of nanoscale precipitation during ageing treatment of laser powder-bed fusion fabricated IN718 Ni-based superalloy

0560218 - ÚJF 2023 RIV US eng J - Journal Article
Kermanpur, A. - Babu, R. P. - Larsson, H. - Ryukhtin, Vasil - Hedstrom, P.
Simulation and experimental analysis of nanoscale precipitation during ageing treatment of laser powder-bed fusion fabricated IN718 Ni-based superalloy.
Materials Characterization. Roč. 191, SEP (2022), č. článku 112163. ISSN 1044-5803. E-ISSN 1873-4189
R&D Projects: GA MŠMT EF16_013/0001812
Research Infrastructure: CANAM II - 90056; Reactors LVR-15 and LR-0 II - 90120
Institutional support: RVO:61389005
Keywords : Laser powder-bed fusion * IN718 Ni-based superalloy * Precipitation simulation * Ageing * Small-angle neutron scattering
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.matchar.2022.112163

Temporal evolution of the nanoscale disc-shaped gamma'' (Ni3Nb) and spherical gamma' (Ni3(Al,Ti)) strengthening pre-cipitates during double-stage ageing treatment of the laser powder-bed fusion (LPBF) fabricated IN718 Ni-based superalloy is studied by thermodynamic-based modeling, electron microscopy, and small-angle neutron scat-tering (SANS). The precipitation kinetics of both gamma'' and gamma' particles in the multi-component/multi-phase IN718 alloy system was successfully predicted by the Langer-Schwartz-Kampmann-Wagner approach. The simulated particle size and volume fraction during ageing was validated against electron microscopy and SANS results, respectively. The size and volume fraction of the gamma'' phase was monotonically increased during the first ageing stage up to about 100 nm and 14%, respectively, but interestingly unchanged during the second stage. On the other hand, the volume fraction of gamma' phase was sharply increased to about 15% after about 100 s and kept constant until the end of the first ageing stage, where it then decreased to about 7%. The gamma' particle size monotonically increased up to about 20 nm. According to the determined temporal evolution of the nanoscale precipitates, a shorter ageing treatment of the LPBF IN718 superalloy compared to the conventionally manu-factured alloy could be suggested.
Permanent Link: https://hdl.handle.net/11104/0333230