Understanding the microstructural stability in a γ'-strengthened Ni-Fe-Cr-Al-Ti alloy
Abstract
Ni-Fe-Cr-Al-Ti alloys, with Ni levels of about 45 at% have the potential to develop a microstructure consisting of a face-centered cubic (γ) matrix with homogeneously precipitated, nanoscale ordered γ' precipitates similar to that found in traditional Ni-based superalloys with a significantly greater Ni content. Here, scanning electron microscopy, transmission electron microscopy, atom probe tomography, and CALPHAD-based thermodynamic modeling were employed to determine the phase stabilities and microstructural evolution in an age-hardenable 44.56Ni-26.6Fe-19.2Cr-1.0Co-3.4Al-4.4Ti-0.7Mo-0.14 C (at%) alloy. The primary heat treatment of solution annealing at 1121 °C for 4 h followed by age-hardening at 760 °C for 16 h resulted in a microstructure consisting of fine γ' precipitates in an austenitic matrix along with grain boundary precipitates of carbides and other minor phases. Long-term aging at 900 °C for 250 h resulted in the coarsening of γ' precipitates along with a change in the morphology from an initial spherical to a more cuboidal shape. In addition, the formation of plate-like η phase precipitates was observed, concomitant with the partial dissolution of the γ' phase. The ability of computational thermodynamic models to predict microstructural characteristics is discussed.
- Authors:
-
[2];
[2];
[2];
[2];
[2];
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1813196
- Alternate Identifier(s):
- OSTI ID: 1818590
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Alloys and Compounds
- Additional Journal Information:
- Journal Volume: 886; Journal Issue: 886; Journal ID: ISSN 0925-8388
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; γ’ precipitate; Fe-Ni-Cr–based superalloys; atom probe tomography; CALPHAD
Citation Formats
Gwalani, Bharat, Shukla, Shivakant, Leonard, Donovan, Poplawsky, Jonathan D., Pierce, Dean T., Kovarik, Libor, Muralidharan, Govindarajan, and Devaraj, Arun. Understanding the microstructural stability in a γ'-strengthened Ni-Fe-Cr-Al-Ti alloy. United States: N. p., 2021.
Web. doi:10.1016/j.jallcom.2021.161207.
Gwalani, Bharat, Shukla, Shivakant, Leonard, Donovan, Poplawsky, Jonathan D., Pierce, Dean T., Kovarik, Libor, Muralidharan, Govindarajan, & Devaraj, Arun. Understanding the microstructural stability in a γ'-strengthened Ni-Fe-Cr-Al-Ti alloy. United States. https://doi.org/10.1016/j.jallcom.2021.161207
Gwalani, Bharat, Shukla, Shivakant, Leonard, Donovan, Poplawsky, Jonathan D., Pierce, Dean T., Kovarik, Libor, Muralidharan, Govindarajan, and Devaraj, Arun. Sat .
"Understanding the microstructural stability in a γ'-strengthened Ni-Fe-Cr-Al-Ti alloy". United States. https://doi.org/10.1016/j.jallcom.2021.161207. https://www.osti.gov/servlets/purl/1813196.
@article{osti_1813196,
title = {Understanding the microstructural stability in a γ'-strengthened Ni-Fe-Cr-Al-Ti alloy},
author = {Gwalani, Bharat and Shukla, Shivakant and Leonard, Donovan and Poplawsky, Jonathan D. and Pierce, Dean T. and Kovarik, Libor and Muralidharan, Govindarajan and Devaraj, Arun},
abstractNote = {Ni-Fe-Cr-Al-Ti alloys, with Ni levels of about 45 at% have the potential to develop a microstructure consisting of a face-centered cubic (γ) matrix with homogeneously precipitated, nanoscale ordered γ' precipitates similar to that found in traditional Ni-based superalloys with a significantly greater Ni content. Here, scanning electron microscopy, transmission electron microscopy, atom probe tomography, and CALPHAD-based thermodynamic modeling were employed to determine the phase stabilities and microstructural evolution in an age-hardenable 44.56Ni-26.6Fe-19.2Cr-1.0Co-3.4Al-4.4Ti-0.7Mo-0.14 C (at%) alloy. The primary heat treatment of solution annealing at 1121 °C for 4 h followed by age-hardening at 760 °C for 16 h resulted in a microstructure consisting of fine γ' precipitates in an austenitic matrix along with grain boundary precipitates of carbides and other minor phases. Long-term aging at 900 °C for 250 h resulted in the coarsening of γ' precipitates along with a change in the morphology from an initial spherical to a more cuboidal shape. In addition, the formation of plate-like η phase precipitates was observed, concomitant with the partial dissolution of the γ' phase. The ability of computational thermodynamic models to predict microstructural characteristics is discussed.},
doi = {10.1016/j.jallcom.2021.161207},
journal = {Journal of Alloys and Compounds},
number = 886,
volume = 886,
place = {United States},
year = {Sat Jul 17 00:00:00 EDT 2021},
month = {Sat Jul 17 00:00:00 EDT 2021}
}
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