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- Title
Concurrent Precipitation of Nb(C,N) and Metastable M<sub>23</sub>C<sub>6</sub> in Alloy 347H at 700°C and 750°C: Computer Simulations and Comparison to Experiment.
- Authors
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
- Abstract
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 M23C6 precipitates 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.
- Subjects
AUSTENITIC stainless steel; STAINLESS steel; COMPUTER simulation; ERROR functions; ALLOYS
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 4, p1444
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-021-05140-9