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

铜和镍含量不同的铁基模型合金被用作样品，这些模型合金在高通量辐照设施中用来自串联电子管的 3-4MeV 镍离子和来自 3.75MeV 范德格拉夫的质子进行辐照。与此同时，东京大学 (HIT) 正在使用日本材料测试反应堆进行中子辐照。（JMTR）。与筑波大学材料科学研究所谷川教授实验室合作进行的正电子湮没研究是本财年的主要兴趣之一，模型合金采用镍离子在563K下加速至3MeV进行辐照。辐照剂量。根据 EDEP-1 代码计算，能量在 0 到 0 之间的单能正电子束处的损伤峰值深度为 1mdpa。将 30keV 的能量照射到样品的离子辐照表面，用半导体探测器检测湮没伽马射线的能谱。在不同的正电子加速电压下重复这些测量，每个辐照样品都显示出增加的能量。与未辐照样品相比的 S 参数这可能表明含铜合金中出现了空位型缺陷。与不含铜的合金相比，S参数的增加对S参数的增加没有影响，从结果推测，铜和铁中的空位之间存在强烈的相互作用。这些结果在 1992 年 10 月日本金属学会秋季会议上报告。尽管尝试了 3MeV 质子辐照样品的类似测量，但 S 参数并未增加。由于缺陷浓度低，似乎有必要增加辐照剂量或降低质子能量来检测质子辐照引起的S参数增加。关于JMTR的中子辐照，已经进行了两个系列的辐照。一个系列是在不同中子谱下的辐照，另一个是在相差一个数量级的两个中子通量水平下的辐照。明年，离子辐照的结果将为中子辐照数据的孪生提供有利的基本信息。