Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys: precipitation reactions and incipient recrystallisation

Tang, YT; Panwisawas, C; Jenkins, BM; Liu, J; Shen, Z; Salvati, E; Gong, Y; Ghoussoub, JN; Michalik, S; Roebuck, B; Bagot, PAJ; Lozano-Perez, S; Grovenor, CRM; Moody, MP; Korsunsky, AM; Collins, DM; Reed, RC

Journal article

Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys: precipitation reactions and incipient recrystallisation

Abstract:: A supersaturated γ phase microstructure is produced in Ni-based superalloys using laser powder bed fusion (L-PBF) – the cooling rate arising from the process is shown to suppress the solid-state precipitation of the γ phase. The response of the material to a heat treatment therefore requires new understanding at the fundamental level, since the first population of precipitate forms upon heating, in contrast to cooling from homogenisation above the γ solvus. Here, we have interrogated two new nickel-based superalloys designed for the L-PBF technology, both in situ and ex situ, at multiple length scales using advanced characterisation methods. First, we conducted in situ synchrotron X-ray diffraction during various heat treatments to trace the evolution of the γ volume fraction with temperature. The first structural changes were detected at an unexpectedly low temperature of ~445 °C. Second, the temperature for γ nucleation and its sensitivity to heating rate was studied using an electrical resistivity method. Then, the γ composition upon heating, isothermal holding and cooling is analysed using atom probe tomography (APT), the result is rationalised by further scanning-transmission electron microscopy and nanoscale secondary ion mass spectroscopy. Finally, static recrystallisation during isothermal exposure was investigated, which occurs within minutes. This work sheds light on a new strategy of tailoring microstructure for additively manufactured superalloys by manipulation of the γ precipitate distribution upon heating.

Publication status:: Published

Peer review status:: Peer reviewed

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APA Style

Tang, Y. T., Panwisawas, C., Jenkins, B. M., Liu, J., Shen, Z., Salvati, E., Gong, Y., Ghoussoub, J. N., Michalik, S., Roebuck, B., Bagot, P. A. J., Lozano-Perez, S., Grovenor, C. R. M., Moody, M. P., Korsunsky, A. M., Collins, D. M., & Reed, R. C. (2023). Multi-length-scale study on the heat treatment response to supersaturated nickel-based superalloys: precipitation reactions and incipient recrystallisation. Additive Manufacturing, 62.

MLA Style

Tang, Y. T., et al. “Multi-Length-Scale Study on the Heat Treatment Response to Supersaturated Nickel-Based Superalloys: Precipitation Reactions and Incipient Recrystallisation.” Additive Manufacturing, vol. 62, Elsevier, 2023.

Chicago Style

Tang, YT, C Panwisawas, BM Jenkins, J Liu, Z Shen, E Salvati, Y Gong, et al. 2023. “Multi-Length-Scale Study on the Heat Treatment Response to Supersaturated Nickel-Based Superalloys: Precipitation Reactions and Incipient Recrystallisation.” Additive Manufacturing 62.
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