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Title: Effect of recrystallization on ion-irradiation hardening and microstructural changes in 15Cr-ODS steel
Authors: Ha, Yoosung
Kimura, Akihiko  kyouindb  KAKEN_id
Author's alias: 木村, 晃彦
Keywords: Dual ion irradiation
Irradiation hardening
Defect trapping and absorption
Issue Date: 15-Dec-2015
Publisher: Elsevier
Journal title: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume: 365
Issue: Part A
Start page: 313
End page: 318
Abstract: 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.
Description: Proceedings of the 19th International Conference on Ion Beam Modification of Materials (IBMM 2014)
Rights: © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
The full-text file will be made open to the public on 15 December 2017 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/217609
DOI(Published Version): 10.1016/j.nimb.2015.07.076
Appears in Collections:Journal Articles

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