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Characterization of γ′ Precipitation Behavior in Additively Manufactured IN738LC Superalloy via In-Situ Small-Angle Neutron Scattering

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Tan,  Qing
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Qin, H., Chi, H., Tao, Y., Xie, M., Shi, S., Yu, H., et al. (2023). Characterization of γ′ Precipitation Behavior in Additively Manufactured IN738LC Superalloy via In-Situ Small-Angle Neutron Scattering. JOM-Journal of the Minerals Metals & Materials Society, 211-223. doi:10.1007/978-3-031-27447-3_14.


Cite as: https://hdl.handle.net/21.11116/0000-0010-0B25-9
Abstract
In the present study, quantitative evaluation of the size and volume fraction of γ′ particles have been studied by Small-Angle Neutron ScatteringSmall-Angle Neutron Scattering (SANS) and FE-SEM in additively manufactured IN738LCIN738LC SuperalloySuperalloys employing isothermal heat treatmentHeat treatment conditions at 850 ℃. The results show that there is no observable γ′ precipitationPrecipitation in the as-deposited alloy, while a large number of small cellular and striated sub-structures can be characterized with widths ranging from 0.5 to 1.5 μm. During the 850 ℃ isothermal heat treatmentHeat treatment, the γ′ phase rapidly precipitates in large quantities and shows a unimodal irregular sphere-like shape. The average size of the γ′ particles increases with longer agingAging times. After 10 min of isothermal heat treatmentHeat treatment the average γ′ particle size is 72.5 nm. This average size increase to 137.3 nm after 120 min of ageing. However, the volume fraction (VF) of γ′ precipitates does not change after 10 min of isothermal heat treatmentHeat treatment time, at which point the VF % reaches about 40%. This result varies significantly from IN738LCIN738LC that was prepared by traditional casting processes.