DAMAGE OF FUSION MATERIALS UNDER VARIABLE IRRADIATION CONDITIONS

可变辐照条件下聚变材料的损坏

• 批准号: 09480110
• 负责人: YOSHIDA Naoaki
• 金额: $ 4.99万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09480110/
• 关键词: fusion material; radiation damage; void swelling; stainless steel; vanadium alloy; スレンレス鋼

Though it is expected that the irradiation conditions such as the temperature and the neutron flux are change widely under operation of fusion reactors, most of the irradiation experiments for fusion material development have been carried out at constant conditions. In this projects, therefore, irradiation experiments were performed at various temperature conditions to understand the fundamental damage mechanism under various conditions.In the case of pure metals and alloys, where no segregation are expected, it was revealed that the temporal unbalance of interstitial atoms and vacancies during the change of the temperature greatly affected the accumulation of damage by comparing the experimental results and numerical calculation of defect accumulation based on the rate theory.On the other hand, in the case of P-modified austenitic stainless steel, which is known as high swelling resistance material due to the sink effects of FeィイD22ィエD2P properties, voids are formed easily by short pre-irradiation at low temperature, because of the formation of unstable FeィイD22ィエD2P precipitates during the pre-irradiation. It was also found that co-addition of Ti with P enhanced the stability of FeィイD22ィエD2P precipitates even in the pre-irradiation at low temperature.It was cleared that the effects of temperature variation on the formation of Ti-oxide is important in the V-4Cr-4Ti alloy. Pre-irradiation at low temperature enhances the formation of high density Ti-oxides, and this results in the large influence on the structure and hardiness of the material. It was also revealed that the suppression of penetration of oxygen through the specimen surfaces is indispensable for the further studies of radiation damage. We will therefore establish the method for the prevention of oxygen penetration at first and continue the studies on the temperature variation effects in the V-4Cr-4T alloy.

虽然预期在聚变反应堆的操作下，诸如温度和中子通量的辐照条件广泛地变化，但是用于聚变材料开发的大多数辐照实验都是在恒定条件下进行的。因此，在本项目中，在各种温度条件下进行了辐照实验，以了解各种条件下的基本损伤机制。在纯金属和合金的情况下，预计没有偏析，实验结果与数值计算结果的对比表明，温度变化过程中间隙原子和空位的时间不平衡对损伤的累积有很大的影响另一方面，在P改性的奥氏体不锈钢的情况下，其由于Fe_（22）Fe_（22）Fe_（22）D_2P性质的下沉效应而被称为高抗溶胀性材料，由于在预照射期间形成不稳定的Fe_（22）Fe_（22）D_2P沉淀物，因此在低温下通过短时间预照射容易形成空隙。Ti和P的共同加入增强了Fe_（22）O_（22）O_（22）P沉淀的稳定性，表明温度变化对V-4Cr-4 Ti合金中Ti氧化物的形成有重要影响。低温预辐照促进了高密度钛氧化物的形成，对材料的结构和硬度有很大影响。研究还表明，抑制氧透过试样表面是进一步研究辐射损伤所不可缺少的。因此，我们将首先建立防止氧渗透的方法，并继续研究温度变化对V-4Cr-4 T合金的影响。

项目成果

K, Yasunaga, H. Watanabe, N. Yoshida, T. Muroga, N. Noda: "Microstructure of Tantalum Irradiated with Heavy Ions"J. Nucll. Mater.. 258-263. 879-882 (1998)

K、Yasunaga、H. Watanabe、N. Yoshida、T. Muroga、N. Noda：“重离子辐照钽的微观结构”J。

H. Wantanabe, T. Arinaga, K. Ochiati, T. Muroga, N. Yoshida: "Microstructure of Vanadium Alloys during Ion Irradiation with Stepwise Change of Temperature"J. Nucl. Mater.. (受理済み). (2000)

H. Wantanabe、T. Arinaga、K. Ochiati、T. Muroga、N. Yoshida：“随着温度的逐步变化，钒合金的微观结构”J.（已接受）。

Q. Xu, N. Yoshida, T. Toshiie: "Defect Formation Processes in Fe-Cr-Ni Alloys by Neuron Irradiation under Thermal Cycles"Materials Trans. JIM.. 38. 836-841 (1997)

Q. Xu、N. Yoshida、T. Toshiie：“热循环下神经元辐照在 Fe-Cr-Ni 合金中的缺陷形成过程”Materials Trans。

Q. Xu, N. Yoshida, T. Yoshiee: "Microstructural Evolution in Austenitic Satinless Steels Irradiated by Neutrons with Improved Control"Sci. Rep. RITU. A45. 71-73 (1997)

Q. Xu、N. Yoshida、T. Yoshiee：“改进控制的中子辐照奥氏体不锈钢的微观结构演化”Sci。

K, Yasunaga, H. Watanabe, N. Yoshida, T. Muroga, N. Noda: "Correlation between Defect Structure and Hardness in Tantalum Irradiated by Heavy Ion"J. Nucl. Mater.. (受理済み). (2000)

K，Yasunaga，H. Watanabe，N. Yoshida，T. Muroga，N. Noda：“重离子材料辐照钽的缺陷结构与硬度之间的关系”（已接受）。