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Title: Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation

Abstract

The current work combines the Cluster Dynamics (CD) technique and CALPHAD-based precipitation modeling to address the second phase precipitation in cold-worked (CW) 316 stainless steels (SS) under irradiation at 300–400 °C. CD provides the radiation enhanced diffusion and dislocation evolution as inputs for the precipitation model. The CALPHAD-based precipitation model treats the nucleation, growth and coarsening of precipitation processes based on classical nucleation theory and evolution equations, and simulates the composition, size and size distribution of precipitate phases. We benchmark the model against available experimental data at fast reactor conditions (9.4 × 10–7 dpa/s and 390 °C) and then use the model to predict the phase instability of CW 316 SS under light water reactor (LWR) extended life conditions (7 × 10–8 dpa/s and 275 °C). The model accurately predicts the γ' (Ni3Si) precipitation evolution under fast reactor conditions and that the formation of this phase is dominated by radiation enhanced segregation. The model also predicts a carbide volume fraction that agrees well with available experimental data from a PWR reactor but is much higher than the volume fraction observed in fast reactors. We propose that radiation enhanced dissolution and/or carbon depletion at sinks that occurs at high flux couldmore » be the main sources of this inconsistency. The integrated model predicts ~1.2% volume fraction for carbide and ~3.0% volume fraction for γ' for typical CW 316 SS (with 0.054 wt% carbon) under LWR extended life conditions. Finally, this work provides valuable insights into the magnitudes and mechanisms of precipitation in irradiated CW 316 SS for nuclear applications.« less

Authors:
 [1];  [2];  [2];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. 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
OSTI Identifier:
1351784
Alternate Identifier(s):
OSTI ID: 1573130
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 130; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Austenitic stainless steels; radiation induced precipitation; radiation enhanced precipitation; LWR extended life conditions

Citation Formats

Mamivand, Mahmood, Yang, Ying, Busby, Jeremy T., and Morgan, Dane. Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.03.025.
Mamivand, Mahmood, Yang, Ying, Busby, Jeremy T., & Morgan, Dane. Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation. United States. https://doi.org/10.1016/j.actamat.2017.03.025
Mamivand, Mahmood, Yang, Ying, Busby, Jeremy T., and Morgan, Dane. Sat . "Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation". United States. https://doi.org/10.1016/j.actamat.2017.03.025. https://www.osti.gov/servlets/purl/1351784.
@article{osti_1351784,
title = {Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation},
author = {Mamivand, Mahmood and Yang, Ying and Busby, Jeremy T. and Morgan, Dane},
abstractNote = {The current work combines the Cluster Dynamics (CD) technique and CALPHAD-based precipitation modeling to address the second phase precipitation in cold-worked (CW) 316 stainless steels (SS) under irradiation at 300–400 °C. CD provides the radiation enhanced diffusion and dislocation evolution as inputs for the precipitation model. The CALPHAD-based precipitation model treats the nucleation, growth and coarsening of precipitation processes based on classical nucleation theory and evolution equations, and simulates the composition, size and size distribution of precipitate phases. We benchmark the model against available experimental data at fast reactor conditions (9.4 × 10–7 dpa/s and 390 °C) and then use the model to predict the phase instability of CW 316 SS under light water reactor (LWR) extended life conditions (7 × 10–8 dpa/s and 275 °C). The model accurately predicts the γ' (Ni3Si) precipitation evolution under fast reactor conditions and that the formation of this phase is dominated by radiation enhanced segregation. The model also predicts a carbide volume fraction that agrees well with available experimental data from a PWR reactor but is much higher than the volume fraction observed in fast reactors. We propose that radiation enhanced dissolution and/or carbon depletion at sinks that occurs at high flux could be the main sources of this inconsistency. The integrated model predicts ~1.2% volume fraction for carbide and ~3.0% volume fraction for γ' for typical CW 316 SS (with 0.054 wt% carbon) under LWR extended life conditions. Finally, this work provides valuable insights into the magnitudes and mechanisms of precipitation in irradiated CW 316 SS for nuclear applications.},
doi = {10.1016/j.actamat.2017.03.025},
journal = {Acta Materialia},
number = C,
volume = 130,
place = {United States},
year = {Sat Mar 11 00:00:00 EST 2017},
month = {Sat Mar 11 00:00:00 EST 2017}
}

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Cited by: 18 works
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Works referencing / citing this record:

Characterization of Passive Films Formed on As-received and Sensitized AISI 304 Stainless Steel
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