Effect of recrystallization on ion-irradiation hardening and microstructural changes in 15Cr-ODS steel

• 木村, 晃彦

• Kimura, Akihiko

抄録

The effects of recrystallization on ion-irradiation hardening and microstructural changes were investigated for a 15Cr-ODS ferritic steel. Dual ion-irradiation experiments were performed at 470 °C using 6.4 MeV Fe3+ ions simultaneously with energy-degraded 1 MeV He+ ions. The displacement of damage at 600 nm depth from the specimen surface was 30 dpa. Nano-indentation test with Berkovich type indentation tip was measured by constant stiffness measurement (CSM) technique. Results from nano-indentation tests indicate irradiation hardening in ODS steels even at 470 °C, while it wasn't observed in reduced activation ferritic steel. Recrystallized ODS steel shows a larger irradiation hardening, which is considered to be due to the reduction of grain boundaries and interfaces of matrix/oxide particles. In 20% cold rolled ODS steel after recrystallization, both the hardening and bubble number density were lower than those of recrystallized ODS steel, suggesting that dislocations generated by cold rolling suppress bubble formation. Based on the estimation of irradiation hardening from TEM observation results, it is considered that the bubbles are not the main factor controlling ion-irradiation hardening.

Proceedings of the 19th International Conference on Ion Beam Modification of Materials (IBMM 2014)

収録刊行物

• Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

  Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 365 (Part A), 313-318, 2015-12-15

  Elsevier

キーワード

• Dual ion irradiation
• Irradiation hardening
• Defect trapping and absorption

詳細情報

• CRID: 1050845760768581504
• NII論文ID: 120005895438
• ISSN: 0168583X
• HANDLE: 2433/217609
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles