Effect of impurities and grain boundaries on the kinetic characteristics of the radiation damage of iron and austenitic steels

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Demidov, D.^1 ; Smirnov, E.^1 ; Tsepelev, A.^1,2

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, 31 Kashirskoe highway, Moscow

115409, Russia^1

Institute of Metallurgy and Materials Science, Russian Academy of Sciences (IMET RAS), 49 Leninsky pr., Moscow

119991, Russia^2

关键词: Austenitic stainless;    Fast neutron reactors;    Kinetic characteristics;    Nucleation and growth;    Radiation-enhanced diffusion;    Recombination rate;    Steady state concentration;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012012/pdf
DOI  :  10.1088/1757-899X/130/1/012012

来源: IOP

【 摘 要 】

Austenitic stainless steel AISI 304, 316 and similar in composition, are used to create many elements of the reactor core, such as fuel cladding of fast-neutron reactor. It is known that during the operation, they became subject to such type of radiation damage, as the vacancy swelling and radiation creep. In this paper, was analyzed the effect of alloying elements, impurities and their complexes with radiation defects (RD) on the characteristics of RD and radiation-enhanced diffusion (RED) Parameters of vacancy voids nucleation and growth processes were also studied on the example of Cr18Ni10T steel. Evaluation of the temperature dependence of steady-state concentration of RD for materials with different binding energy complexes «defect - impurity», the effective values of mutual recombination rate RD for materials complexes, influence the formation of impurity complexes and volume density of grain boundaries on the rate of growth of vacancy voids and radiation creep was conducted. The possibility of varying the characteristics of the complex defect - impurity and grain boundary size for the suppression of radiation creep and vacancy swelling was studied.