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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

采用铜和镍含量不同的铁基模型合金作为试样。在东京大学高通量辐照装置（HIT）上用来自串列加速器的3- 4 MeV镍离子和来自货车de Graaff的3.75MeV质子辐照这些模型合金。与此同时，利用日本材料试验堆（JMTR）进行中子辐照。与谷川教授实验室合作进行正电子湮没研究，筑波大学材料科学研究所是本财政年度的主要兴趣之一。在563 K下，用加速至3 MeV的镍离子辐照模型合金，根据EDEP-1程序计算，辐照剂量在损伤峰值深度处为1 mdpa。用能量在0 ~ 30 keV的单能正电子束轰击样品表面，用半导体探测器探测湮没γ射线的能谱，测量了样品表面的湮没γ射线能谱。 ...更多信息用各种正电子加速电压重复测试。与未辐照样品相比，每个辐照样品的S-参数都有所增加。这可能表明产生了空位型缺陷。关于材料成分的影响，含铜合金比不含铜的合金表现出更大的S参数的增加。镍对S参数的增加没有影响。根据实验结果推测，铜与铁中的空位之间存在较强的相互作用，并产生了铜-空位复合物。这些结果在1992年10月的日本金属研究所秋季会议上报告。虽然类似的测量的3 MeV质子辐照的样品进行了尝试，增加的S-参数没有检测到由于低缺陷浓度。为了检测质子辐照引起的S参数增加，似乎有必要增加辐照剂量或降低质子能量。关于JMTR的中子辐照，已经开始了两个系列的辐照。一个系列是在不同的中子能谱下的辐照，另一个系列是在相差一个数量级的两个中子通量水平下的辐照。辐照后实验将从明年开始。离子辐照的结果为中子辐照数据的分析提供了有益的基础信息。少