Effects of Neutron Irradiation on Precipitation in Reactor Pressure Vessel Steels
Effects of Neutron Irradiation on Precipitation in Reactor Pressure Vessel Steels
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中子辐照对反应堆压力容器钢中析出物的影响
DOI：
10.1520/jai12386
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
T. Williams
中科院分区：
文献类型：
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作者：
R. Faulkner;Z. Lu;D. Ellis;T. Williams
几种不同Ni、Cu和Mo含量的MnMoNi压力容器钢在辐照和未辐照条件下进行了研究。为了更全面地了解这些合金中颗粒间和颗粒内析出的性质，使用分析透射电子显微镜进行了检查。特别要注意的是，除了铜沉淀外，材料中还存在碳化物种群，这在其他地方得到了详细的研究。最引人注目的发现是在这些钢中发现了细小的、颗粒内（直径10纳米）的Fe3C颗粒，以及通常预期的类似大小的富铜沉淀。中子辐照增加了所有相（Fe3C、Cu-rich和Mo2C）的颗粒间和颗粒内析出的体积分数。在高镍条件下，中子辐照对增加体积分数的作用最小；高铜合金（WV）中子辐照对析出率的影响在低镍条件下最大；高铜合金（SG (SH)）在高镍区，晶间析出最为普遍；低铜材料（WF）值得注意的是，这种材料含有最少的颗粒内细尺度沉淀。这可能是因为Cu的析出很少。Mo和C对Mo2C相的形成有重要影响，在高Mo-C的辐照材料（SH） （0.48% Mo）中观察到大量Mo2C相的形成。这些结果讨论了各种模型的颗粒间和内部的沉淀成核和生长。
Several MnMoNi pressure vessel steels with varying Ni, Cu, and Mo contents have been investigated in the irradiated and unirradiated condition. Examination using analytical transmission electron microscopy was performed in order to understand more fully the nature of both the inter- and intra-granular precipitation in these alloys. In particular, attention has been paid to the carbide population, which exists in the material in addition to the copper precipitates, which have received detailed study elsewhere. The most dramatic revelations concern the discovery that fine, intra-granular (10 nm diameter) Fe3C particles are present in these steels, in addition to the normally expected copper-rich precipitates of a similar size. Neutron irradiation increases the volume fractions of inter- and intra-granular precipitation of all phases (Fe3C, Cu-rich, and Mo2C). Neutron irradiation has the least effect in increasing volume fraction in high Ni; high Cu alloys (WV). The effects of neutron irradiation on precipitation rates are greatest in low Ni; high Cu alloys (SG (SH)). Inter-granular precipitation is most prevalent in the high Ni; low Cu material (WF). It is significant that this material contains the least intra-granular fine-scale precipitation. This is probably because the Cu precipitation is minimal. Mo and C have an important influence on the amount of Mo2C phase formed, with large amounts being observed in high Mo-C, irradiated material (SH) (0.48 % Mo). These results are discussed in terms of various models for inter-and intra-granular precipitate nucleation and growth.