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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Irradiation-induced precipitates in a neutron irradiated 304 stainless steel studied by three-dimensional atom probe
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Irradiation-induced precipitates in a neutron irradiated 304 stainless steel studied by three-dimensional atom probe

机译：三维原子探针研究中子辐照304不锈钢中辐照引起的析出物

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摘要

Irradiation-induced precipitates in a 304 stainless steel, neutron-irradiated to a dose of 24 dpa at 300 °C in the fuel wrapper plates of a commercial pressurized water reactor, were investigated by laser-assisted three-dimensional atom probe. A high number density of 4 × 10~(23) m~(-3) of Ni-Si rich precipitates was observed, which is one order of magnitude higher than that of Frank loops. The average diameter was ～10 nm and the average chemical composition was 40% Ni, 14% Si, 11% Cr and 32% Fe in atomic percent. Over a range of Si concentrations, the ratio of Ni to Si was ～3, close to that of γ′ precipitate (Ni_3Si). In some precipitates, Mn enrichment inside the precipitate and P segregation at the interface were observed. Post-irradiation annealing was performed to discuss the contribution of the precipitates to irradiation-hardening.
机译：用激光辅助三维原子探针研究了304不锈钢的辐照诱发沉淀物，该辐照沉淀物是在商用加压水反应堆的燃料封壳板中于300°C辐照剂量为24 dpa的中子辐照的。观察到高4×10〜（23）m〜（-3）的富Ni-Si析出物的密度，比弗兰克环高出一个数量级。平均直径为〜10 nm，平均化学成分为原子百分比的40％Ni，14％Si，11％Cr和32％Fe。在一定范围的Si浓度下，Ni与Si之比约为〜3，接近于γ'沉淀物（Ni_3Si）。在某些析出物中，观察到析出物中的Mn富集和界面处的P偏析。进行辐照后退火以讨论沉淀物对辐照硬化的贡献。

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