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- 저자 : Kozeschnik, Ernst (검색결과 1 건)
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Shim, Jae-Hyeok,Povoden-Karadeniz, Erwin,Kozeschnik, Ernst,Wirth, Brian D. Elsevier 2015 JOURNAL OF NUCLEAR MATERIALS Vol.462 No.-
<P><B>Abstract</B></P> <P>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 γ′ and G phases. In addition to the original compositions, the compositions for radiation-induced segregation at a dose level of 5, 10 or 20dpa have been used in the simulation. In a 316 austenitic stainless steel, γ′ appears as the main precipitate with a small amount of G phase forming at 10 and 20dpa. On the other hand, G phase becomes relatively dominant over γ′ at the same dose levels in a Ti-stabilized 316 austenitic stainless steel, which tends to suppress the formation of γ′. 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.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We model the precipitation kinetics in irradiated 316 austenitic stainless steels. </LI> <LI> Radiation-induced phases are predicted to form at over 10dpa segregation conditions. </LI> <LI> The Si content is the most critical for the formation of radiation-induced phases. </LI> </UL> </P>
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