The Role of Chemical Composition in WWER RPV Irradiation Embrittlement

A. Kryukov, L. Debarberis, U. V. Estorff, F. Gillemot
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引用次数: 4

Abstract

The main chemical elements influencing WWER RPV steel radiation embrittlement are copper, phosphorus, nickel and manganese. Copper and phosphorus are the main influencing elements for WWER-440 RPVs. The influence of copper is implemented in the forming of nanocluster centres rounded by other elements which are the effective barriers to dislocation movements. Phosphorus segregates inside the grains, interacting with matrix defects and attracted to the Cu-type precipitates. Phosphorus also migrates to grain boundaries through diffusion processes. Due to the higher nickel content and very low copper and phosphorus present in WWER-1000 RPV steel, the main influencing element for this RPV type is nickel. The manganese content also has to be taken into account due to synergism of Ni and Mn. The semi-mechanistic model is based on key embrittlement mechanisms of chemical elements influence: matrix damage, irradiation-induced precipitation and element segregation proposed.
化学成分在WWER RPV辐照脆化中的作用
影响WWER RPV钢辐射脆化的主要化学元素是铜、磷、镍和锰。铜和磷是影响WWER-440 RPVs性能的主要元素。铜的影响是在被其他元素包围的纳米团簇中心的形成中实现的,这些元素是位错运动的有效屏障。磷在晶粒内部偏析,与基体缺陷相互作用并被cu型析出相吸引。磷也通过扩散过程迁移到晶界。由于WWER-1000 RPV钢中镍含量较高,而铜和磷含量极低,因此镍是影响该类型RPV钢性能的主要因素。由于Ni和Mn的协同作用,锰的含量也必须考虑在内。该半机制模型基于化学元素影响脆性的关键机制:基体损伤、辐照诱导析出和元素偏析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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