APT characterization of high nickel RPV steels
APT characterization of high nickel RPV steels
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DOI：
10.1016/j.jnucmat.2006.02.013
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发表时间：
2006-06
影响因子：
3.1
通讯作者：
Michael K. Miller;M. Sokolov;R. Nanstad;K. F. Russell
中科院分区：
文献类型：
--
作者：
Michael K. Miller;M. Sokolov;R. Nanstad;K. F. Russell
采用原子探针层析成像技术对三种高镍压力容器钢的显微组织进行了表征，探讨了高镍含量对高、低铜压力容器钢中子辐照响应的影响。高镍、低锰、低铜的VVER-1000焊缝和锻件在中子辐照下的脆化程度低于预期。Palisades焊缝温度为ΔT41Jof 102°C，显著低于Reg预测的154°C。指南1.99 Rev. 2原子探针层析成像显示，中子辐照后，VVER-1000基体和焊接材料中均存在富集镍、锰和硅的析出物。中子辐照后，在Palisades焊缝中观察到大量富集铜、镍、锰、硅和磷的析出相。原子探针断层扫描也显示了高水平的磷偏析在所有三种材料的位错。
The microstructures of three high nickel content pressure vessel steels have been characterized by atom probe tomography to investigate the influence of high nickel levels on the response to neutron irradiation of high and low copper pressure vessel steels. The high-nickel, low-manganese, low-copper VVER-1000 weld and forging exhibited lower than predicted levels of embrittlement during neutron irradiation. The Palisades weld exhibits a ΔT41Jof 102°C which was significantly lower than the value of 154°C predicted by Reg. Guide 1.99 Rev. 2. Atom probe tomography revealed nickel-, manganese-, and silicon-enriched precipitates in both the VVER-1000 base and weld materials after neutron irradiation. A high number density of copper-, nickel-, manganese-, silicon- and phosphorus-enriched precipitates were observed in the Palisades weld after neutron irradiation. Atom probe tomography also revealed high levels of phosphorus segregation to the dislocations in all three materials.