Concurrent Precipitation of Nb(C,N) and Metastable M23C6 in Alloy 347H at 700°C and 750°C: Computer Simulations and Comparison to Experiment

Glazoff, Michael V.; Gao, Michael C.; Capolungo, Laurent; Brady, Michael P.; Ilevbare, Gabriel O.; Yamamoto, Yukinori; Ren, Qing-Qiang; Poplawsky, Jonathan D.; Yu, Jianguo; Zhang, Feng

doi:10.1007/s11837-021-05140-9

Title: Concurrent Precipitation of Nb(C,N) and Metastable M₂₃C₆ in Alloy 347H at 700°C and 750°C: Computer Simulations and Comparison to Experiment

Journal Article · 04 February 2022 · JOM. Journal of the Minerals, Metals & Materials Society

DOI: https://doi.org/10.1007/s11837-021-05140-9 · OSTI ID:1883662

^[1]; Gao, Michael C. ^[2]; Capolungo, Laurent ^[3];

^[4]; Ilevbare, Gabriel O. ^[1];

^[4];

^[4]; Yu, Jianguo ^[1]; Zhang, Feng ^[5]

Idaho National Lab. (INL), Idaho Falls, ID (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab., Ames, IA (United States)

Here, we present our results for the concurrent precipitation of metastable M₂₃C₆, Nb(C,N) secondary precipitates, and the Nb(C,N) primary crystals in 347H austenitic stainless steel. For precipitation modeling, we have accounted for the elastic contribution to interfacial energy, and for the Fe-spin-polarization for NbC/Fe and M₂₃C₆/Fe interfacial energy values: for NbC/Fe ~ 0.63 J/m². For M₂₃C₆ precipitates, an error function was used to describe the interfacial energy growth with particle size. In precipitation simulations, the average size of the primary Nb(C,N) particles remained ~ 1 μm at 700°C and ~ 0.3 μm at 750°C. The M₂₃C₆precipitates at 750°C dissolved after 120 h (our simulations) compared to 300 h (experiments). The Nb(C,N)/Fe interfacial energy was not affected by the nitrogen additions. With these modifications, reasonable agreement with the available experimental data was obtained, which allows using them in the development of the 2nd-phase particle-informed creep theory.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1883662

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 4 Vol. 74; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Concurrent Precipitation of Nb(C,N) and Metastable M₂₃C₆ in Alloy 347H at 700°C and 750°C: Computer Simulations and Comparison to Experiment