A Challenge to Development of Functionally-graded Long-life Divertor based on Degradation Behavior Caused by Thermal Fatigue of Tungsten

2017 Fiscal Year Final Research Report

• Project/Area Number: 26289351
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Tohoku University
• Principal Investigator: Nogami Shuhei 東北大学, 工学研究科, 准教授 (00431528)
• Co-Investigator(Kenkyū-buntansha): 江原 真司 東北大学, 工学研究科, 准教授 (30325485) ; 福田 誠 東北大学, 工学(系)研究科(研究院), 助教 (70757666) ; 涌井 崇志 東北大学, サイクロトロン・ラジオアイソトープセンター, 助教 (70359644) ; 藪内 聖皓 東北大学, 工学(系)研究科(研究院), 助教 (70633460)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 核融合炉 / ダイバータ / タングステン / 強度 / 疲労 / 寿命 / 固相拡散接合 / 傾斜機能

Outline of Final Research Achievements

The objective of this research is development of functionally-graded tungsten (W) for divertor using a void dispersion strengthened W (VDSW) and a nano structure controlled W (NSCW). Based on the fundamental mechanical properties, recrystallization behavior, fatigue properties, and resistance to the beam bombardment, development of the VDSW and NSCW was carried out and the excellent performance was shown by these materials. Development of a new testing machine for evaluating the fatigue properties was also carried out and the available data of these materials were obtained. In contrast, the evaluation of resistance to helium implantation was carried out under the only limited evaluation conditions. This is one of the issues to be improved by future works. However, the development of fabrication technology of reasonable joints using VDSW and NSCW was all but almost over. Therefore, the objective of this research is considered to be basically achieved.

Free Research Field

核融合・原子力材料