Development pf fabrication technology for fusion blanket components with low activation vanadium alloys

低活化钒合金熔覆层部件制造技术的开发

• 批准号: 14380223
• 负责人: MUROGA Takeo
• 金额: $ 8.19万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14380223/
• 关键词: vanadium alloy; fusion blanket; fabrication technology; ceramics coating; laser welding; 政策技術

Fabrication technology of vanadium alloys has been developed for application to liquid lithium blanket for fusion reactors. Special efforts were made on laser welding technology, tube fabrication technology and ceramics insulator coating technology. Microstructural characterization during the fabrication was carried out which enhanced mechanistic understanding on the processing.Laser welding technology was developed by developing the impurity control procedure during the welding. With the decrease in the impurity pick-up during the welding, the weldment comparable mechanical properties to those of the matrix. With appropriate post weld thermal treatment, the degradation in the resistance to neutron irradiation of the weld joint was eliminated.Ceramic insulator coating with Er203 was developed both with PVD and in-situ coating methods. The resulting coating showed high stability in liquid lithium for a long period as far as the coating has high crystallinity. The coatings showed satisfactory resistance for application to the insulator coating.Fabrication of the thin wall tube for pressurized creep tube specimens were fabricated. By maintaining the precipitation orientation, less cracks were formed than those of the previous tubes. With the products, highly reliable thermal creep data are being obtained in vacuum and liquid thium environments.By these technological advancement, feasibility of the blanket construction, including test blanket modules, was demonstrated.

研制了用于聚变反应堆用液态锂包层的钒合金制备技术。重点研究了激光焊接技术、管材制造技术和陶瓷绝缘子涂层技术。在制造过程中进行了显微组织表征，增强了对加工机理的理解。激光焊接技术是通过制定焊接过程中的杂质控制程序而发展起来的。随着焊接过程中杂质的减少，焊接件的力学性能与基体相当。通过适当的焊后热处理，消除了焊缝抗中子辐照性能下降的现象。采用PVD法和原位镀膜法制备了Er203陶瓷绝缘子涂层。所制备的涂层具有较高的结晶度，在液态锂中长期具有较高的稳定性。该涂层具有良好的绝缘子涂层耐磨性。制备了用于加压蠕变管的薄壁管试样。通过保持析出方向，形成的裂纹比以前的管少。利用该产品，在真空和液态硫环境下获得了高度可靠的热蠕变数据。通过这些技术进步，论证了包层结构的可行性，包括测试包层模块。

项目成果

長坂琢也, 室賀健夫, 飯久保知人: "Development of tubing technique for high-purity low activation vanadium alloys"Fusion Science and Technology. 44. 465-469 (2003)

Takuy​​a Nagasaka、Takeo Muroga、Tomito Iikubo：“高纯低活化钒合金管材技术的开发”Fusion Science and Technology，44. 465-469 (2003)。

長坂琢也, 室賀健夫, Grossbeck, 山本琢也: "Effects of post-weld heat treatment on hardness, microstructure and impact properties of vanadium alloys"Journal of Nuclear Materials. 307-311. 1595-1599 (2002)

Takuy​​a Nagasaka、Takeo Muroga、Grossbeck、Takuy​​a Yamamoto：“焊后热处理对钒合金硬度、微观结构和冲击性能的影响”核材料杂志 307-311 (2002)。

Improvement of vanadium alloys by precipitate control for structural components of fusion reactors

通过控制聚变反应堆结构部件的析出物来改进钒合金

• 期刊: Science Forum, Vol.475-479
• 作者: T. Muroga;T. Nagasaka;A. Nishimura;J.M. Chen
• 通讯作者: J.M. Chen

Development of tubing technique for high-purity low activation vanadium alloys

高纯低活化钒合金管材技术开发

• 发表时间: 2003
• 期刊: Fusion Science and Technology 44
• 作者: 長坂琢也

Impact properties of NIFS-HEAT-2 (V–4Cr–4Ti) after YAG laser welding and neutron irradiation at 563 K

• DOI: 10.1016/j.jnucmat.2004.04.171
• 发表时间: 2004-08
• 期刊: Journal of Nuclear Materials
• 影响因子: 3.1
• 作者: T. Nagasaka;N. Heo;T. Muroga;A. Nishimura;Hideo Watanabe;M. Narui;K. Shinozaki