Recovery of mechanical property in low-activation vanadium alloys in post-irradiation heat treatment

• Project/Area Number: 20560763
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: University of Fukui
• Principal Investigator: FUKUMOTO Kenichi University of Fukui, 附属国際原子力工学研究所, 教授 (30261506)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 低放射化バナジウム合金 / 照射脆性 / 熱回復 / 補修技術 / 原子力・エネルギー / 格子欠陥 / 回復 / 照射脆化

Research Abstract

In order to improve the irradiation embrittlement of low activation-induced V-4Cr-4Ti alloy after neutron irradiation below 300C, a research for post-irradiation heat treatment for neutron-irradiated vanadium alloys was conducted. It was found that an anneal treatment at 500C for 10 to 20 hours in a vacuum was required tomake the ductility of irradiated vanadium alloys recovered in tensile test after the anneal treatment. The recovery of ductile behavior in irradiated vanadium alloys is caused by the transition of deformation mode from rapid local necking deformation to uniform deformation due to the reduction of barrier strength factor for defect clusters. It was considered that the reduction of barrier strength factor for defect clusters against dislocation motion during deformation was brought by desorption of interstitial gas impurities from defect clusters after anneal treatment as the interstitial impurities had been absorbed in dislocation core in the as-irradiated ones.

Research Products

• [Journal Article] (2011)
• [Presentation] 低放射化バナジウム合金の低温熱時効による塑性回復の研究 (2011)
  • Author(s): 岩崎将大, 福元謙一, 徐虫L、
  • Organizer: 日本原子力学会2011年春の大会
  • Place of Presentation: 福井市
  • Year and Date: 2011-03-29
• [Presentation] 低放射化バナジウム合金の低温熱時効による塑性回復の研究 (2011)
  • Author(s): 岩崎将大, 福元謙一, 徐虫L
  • Organizer: 日本原子力学会2011年春の大会
  • Place of Presentation: 福井大学
  • Year and Date: 2011-03-29
• [Presentation] 低温中性子照射したバナジウム合金の高温引張試験におけるセレーション挙動 (2010)
  • Author(s): 岩崎将大, 福元謙一, 山崎正徳, 鳴井実, 徐虫L
  • Organizer: 第8回核融合連合講演会
  • Place of Presentation: 飛騨市
  • Year and Date: 2010-06-09
• [Presentation] 低温中性子照射したバナジウム合金の高温引張試験におけるセレーション挙動 (2010)
  • Author(s): 岩崎将大, 福元謙一, 山崎正徳, 鳴井実, 徐虫L
  • Organizer: 第8回核融合連合講演会
  • Place of Presentation: 岐阜県高山市
  • Year and Date: 2010-06-09
• [Presentation] Precipitation behavior on mechanical property change for thermal aging heat treatment in V-Cr-Ti alloys (2009)
  • Author(s): Y.Kuroyanagi, K.Fukumoto
  • Organizer: ICFRM-14
  • Place of Presentation: 札幌
  • Year and Date: 2009-09-08
• [Presentation] Precipitation behavior on mechanical property change for thermal aging heat treatment in V-Cr-Ti alloys (2009)
  • Author(s): Y.Kuroyanagi, K.Fukumoto
  • Organizer: ICFRM-14
  • Place of Presentation: 札幌コンベンションセンター
  • Year and Date: 2009-09-08
• [Presentation] 常陽炉重照射バナジウム合金の機械的特性と損傷組織の相関性 (2009)
  • Author(s): 福元謙一
  • Organizer: 日本原子力学会
  • Place of Presentation: 東京都東京工業大学
  • Year and Date: 2009-03-25
• [Remarks] ホームページ等