Modeling precipitation thermodynamics and kinetics in type 316 austenitic stainless steels with varying composition as an initial step toward predicting phase stability during irradiation
- Modeling precipitation thermodynamics and kinetics in type 316 austenitic stainless steels with varying composition as an initial step toward predicting phase stability during irradiation
- 심재혁; Povoden-Karadeniz, Erwin; Kozeschnik, Ernst; Wirth, Brian D.
- Radiation-induced segregation; Radiation-induced phase; Precipitation; Kinetic simulation; Austenitic stainless steel; Neutron irradiation
- Issue Date
- JOURNAL OF NUCLEAR MATERIALS
- VOL 462, 250-257
- The long-term evolution of precipitates in type 316 austenitic stainless steels at 400 C has been simulated using a numerical model based on classical nucleation theory and the thermodynamic extremum principle. Particular attention has been paid to the precipitation of radiation-induced phases such as c0 and G phases. In addition to the original compositions, the compositions for radiation-induced segregation at a dose level of 5, 10 or 20 dpa have been used in the simulation. In a 316 austenitic stainless steel, c0 appears as the main precipitate with a small amount of G phase forming at 10 and 20 dpa. On the other hand, G phase becomes relatively dominant over c0 at the same dose levels in a Ti-stabilized 316 austenitic stainless steel, which tends to suppress the formation of c0 . Among the segregated alloying elements, the concentration of Si seems to be the most critical for the formation of radiation-induced phases. An increase in dislocation density as well as increased diffusivity of Mn and Si significantly enhances the precipitation kinetics of the radiation-induced phases within this model.
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