A Research on the Mechanisms of Radiation Embrittlement of Steels

钢的辐射脆化机理研究

基本信息

批准号：
02452289
负责人：
ISHINO Shiori
金额：
$ 4.1万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

Iron based model alloys of which copper and nickel contents are varied have been employed as the specimen. These model alloys were irradiated with 3-4MeV nickel ions from a tandetron and with protons from 3.75MeV van de Graaff at the High Fluence Irradiation Facility of the University of Tokyo (HIT). In parallel with these, neutron irradiations are being carried out using the Japanese Material Testing Reactor (JMTR).Positron annihilation study in collaboration with Professor Tanigawa's Lab., Institute of Material Science, Tsukuba University was one of the main interests in this fiscal year. The model alloys were irradiated with nickel ions accelerated to 3MeV at 563K.The irradiation dose was 1mdpa at the damage peak depth as calculated by the EDEP-1 code. Monoenergetic positron beams with energies between 0 and 30keV were impinged into the ion-irradiated surface of the sample, and the energy spectrum of the annihilation gamma-rays were detected with a semiconductor detector.These measu … More rements were repeated with various positron accelerating voltages. Each irradiated sample showed the increase of S-parameter in comparison with the unirradiated sample. This may indicate the production of vacancy-type defects. With regard to the effect of the material composition, copper-bearing alloys showed the greater increase of the S-parameter than the alloys containing no copper. Nickel had no effect on the S-parameter increase. It is speculated from the results that there is a strong interaction between copper and vacancies in iron, and that the production of the copper-vacancy complexes occurs. These results were reported at the autumn meeting of the Japan Institute of Metals in October, 1992. Although similar measurements of the 3MeV-proton irradiated samples were attempted, increase of S-parameter was not detected due to the low defect concentration. It seems necessary to increase the irradiation dose or to lower the proton energy for detecting the S-parameter increase caused by proton irradiation.With regard to the neutron irradiation at the JMTR,two series of irradiations have already started. One series is the irradiation under varied neutron spectrum, another is the irradiation under two neutron flux levels which differ by one order of magnitude. Post irradiation experiments will begin from next year. The results of the ion irradiation would give the profitable fundamental information for the analyzes of the neutron irradiation data. Less

基于铁和镍含量的基于铁的模型合金已被用作样品。这些模型合金用来自Tandetron的3-4MEV镍离子和来自东京大学高通量辐照设施的3.75mev van de Graaff的质子辐照。与这些同时，正在使用日本材料测试反应堆（JMTR）进行中子辐射。与塔尼川教授实验室合作，Tsukuba University材料科学研究所，positron an灭研究是本财政年度的主要利益之一。该模型合金在563K时以加速至3MEV的镍离子受照射。辐照剂量为1MDPA，在EDEP-1代码计算的损伤峰深度下为1MDPA。带有0至30keV之间的能量的单烯型极光束撞击了样品的离子辐照表面，并用半导体检测器检测到an灭伽玛射线的能量光谱。这些测量值……通过各种正电子加速度电压重复更多的动元。每个受照射样品显示与未辐照样品相比，S参数的增加。这可能表明产生空缺型缺陷。关于材料成分的作用，含铜合金显示出比不含铜的合金更大的S参数增加。镍对S参数增加没有影响。从结果中可以推测出铁中的铜和空位之间存在很强的相互作用，并且出现了铜胶合络合物的产生。这些结果在1992年10月在日本金属研究所的秋季会议上报道了。尽管尝试了3Mev-Proton辐照样品的类似测量，但由于缺陷浓度较低，未检测到S参数的增加。似乎有必要增加辐照剂量或降低质子能量以检测由质子照射引起的S参数增加。关于JMTR的中子辐射，已经开始了两个系列的辐照。一个系列是在不同的中子光谱下的辐照，另一个是在两个中子通量水平下的辐射，其数量级不同。辐照后实验将从明年开始。离子照射的结果将为中子辐照数据分析提供有利可图的基本信息。较少的