Mechanisms for high creep resistance in alumina forming austenitic (AFA) alloys

Gwalani, Bharat; Escobar, Julian D.; Song, Miao; Thomas, Jonova; Silverstein, Joshua; Chuang, Andrew Chihpin; Singh, Dileep; Brady, Michael P.; Yamamoto, Yukinori; Watkins, Thomas R.; Devaraj, Arun

doi:10.1016/j.actamat.2023.119494

Title: Mechanisms for high creep resistance in alumina forming austenitic (AFA) alloys

Journal Article · 03 November 2023 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2023.119494 · OSTI ID:2251631

Gwalani, Bharat ^[1];

^[2];

^[2]; Thomas, Jonova ^[3]; Silverstein, Joshua ^[2]; Chuang, Andrew Chihpin ^[3]; Singh, Dileep ^[3];

^[4];

^[4]; Devaraj, Arun ^[2]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); North Carolina State University, Raleigh, NC (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Castable alumina forming austenitic (AFA) alloys have demonstrated superior creep life and oxidation resistance at temperatures exceeding 800⁰C. Despite the success in the applicability of these alloys in extreme environments, there is a limited understanding of the deformation modes and the influence of each alloying element guiding the alloy design strategies that could further enhance the creep strength of these AFA alloys, particularly at temperatures at and above 900⁰C. In this study, we reveal the mechanism underpinning the superior creep performance of castable AFA alloys that involves suppressing primary carbide formation through minor compositional modification. This approach results in a three-fold increase in creep strength at 900⁰C and 50 MPa. Here, by employing integrated characterization techniques, we analyzed the microstructures of two AFA alloys, both before and after the creep process. We discovered that the suppression of primary carbides permits the in-situ clustering of now-available interstitial elements such as C, Si, and O during high-temperature creep. This improved solid solution strengthening and reduced stacking fault energy of the alloy. Moreover, it also enabled controlled secondary carbide formation during testing, further improving the creep resistance. These findings underline the important interplay between alloy composition, microstructure, and creep properties, and offer a promising design strategy for developing economical high-temperature Fe-based alloys suitable for advanced applications.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Environmental Molecular Sciences Laboratory (EMSL), Richland, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE

Grant/Contract Number:: AC05-00OR22725; AC05-76RL01830; AC02–06CH11357

OSTI ID:: 2251631

Alternate ID(s):: OSTI ID: 2369748

Journal Information:: Acta Materialia, Vol. 263, Issue 1; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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dislocation
microscopy
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