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首页> 美国政府科技报告 >Modeling the influence of irradiation temperature and displacement rate on hardening due to point defect clusters in ferritic steels
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Modeling the influence of irradiation temperature and displacement rate on hardening due to point defect clusters in ferritic steels

机译：模拟辐照温度和位移速率对铁素体钢中点缺陷团簇硬化的影响

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The influence of irradiation temperature and displacement rate have been investigated using a detailed kinetic model that incorporates an explicit description of point defect clustering. These clusters are potentially responsible for the fraction of the radiation-induced hardening that is attributed to the so-called ''matrix defect.'' The model considers both interstitial and vacancy clustering, with the former treated as Frank loops and the later treated as microvoids. The point defect clusters can be formed either directly in the displacement cascade or by diffusive encounters between free point defects. The results indicate that the assumption of steady state point defect concentrations is not valid for temperatures much below the light water reactor pressure vessel operating temperature of about 288(degrees)C. At lower temperatures, the time required for the point defect concentrations to reach steady state can exceed an operating reactor's lifetime. Even at 288(degrees)C, the length of the point defect transient could influence the interpretation of irradiation experiments conducted at accelerated damage rates. The hardening due to point defect clusters was calculated using a simple dislocation barrier model. The model predicts that both cluster types can give rise to significant hardening. The relative importance of each type is shown to be a function of irradiation temperature and displacement rate.

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