Study of the flux effect nature for VVER-1000 RPV welds with high nickel content
Study of the flux effect nature for VVER-1000 RPV welds with high nickel content
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高镍含量 VVER-1000 RPV 焊缝的焊剂效应性质研究
DOI：
10.1016/j.jnucmat.2016.10.030
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发表时间：
2017
影响因子：
3.1
通讯作者：
G. Zhuchkov
中科院分区：
文献类型：
--
作者：
E. Kuleshova;B. Gurovich;Z. V. Lavrukhina;D. Maltsev;S. Fedotova;A. Frolov;G. Zhuchkov
本工作是对VVER-1000反应堆压力容器（RPV）用钢晶界偏析过程基本规律研究的扩展。本文考虑了不同快中子通量辐照对VVER-1000 RPV焊缝金属（WM）的组织、屈服强度和韧脆转变温度（TK）变化以及脆性沿晶断裂份额和偏析过程发展的影响。所获得的实验结果允许分离的硬化和非硬化机制的机械性能退化的材料在工作温度下照射的贡献。结果表明，相同注量、不同快中子注量辐照WM后，其TK位移的差异主要是由于杂质的GB积累动力学的差异，而材料硬化的影响很小。采用操作因素影响下低合金低碳钢中磷GB累积的动力学模型，对温度暴露、加速辐照和监视试样（SS）内辐照的磷体扩散系数进行了评估。通过实验获得了磷和镍的GB偏析水平与WM SS中的TK位移之间的相关性，并表明非硬化机制对VVER-1000 RPV钢在其整个延长寿命期间的总辐射脆化的贡献。
This work extends the research of the basic regularities of segregation processes in the grain boundaries (GB) of VVER-1000 reactor pressure vessel (RPV) steels. The paper considers the influence of irradiation with different fast neutron fluxes on the structure, yield strength and ductile-to-brittle transition temperature (TK) changes as well as on changes of the share of brittle intergranular fracture and development of segregation processes in the VVER-1000 RPV weld metal (WM). The obtained experimental results allow to separate the contribution of the hardening and non-hardening mechanisms to mechanical properties degradation of material irradiated at the operating temperature. It is shown that the difference in TKshift in WM irradiated to the same fluence with different fast neutron fluxes is mainly due to the difference in the GB accumulation kinetics of impurities and only to a small extent due to the material hardening. Phosphorus bulk diffusion coefficients were evaluated for the temperature exposure, accelerated irradiation and irradiation within surveillance specimens (SS) using a kinetic model of phosphorus GB accumulation in low-alloyed low-carbon steels under the influence of operational factors. The correlation between the GB segregation level of phosphorus and nickel, and the TKshift - in WM SS was obtained experimentally and indicates the non-hardening mechanism contribution to the total radiation embrittlement of VVER-1000 RPV steels throughout its extended lifetime.
透射电子显微镜
DOI：
10.1007/978-3-319-26651-0_3
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Burke M
通讯作者：
Burke M