Volume 4, Issue 7 (July 2007)

    Irradiation Hardening and Microstructure Evolution of Ion-irradiated ODS Ferritic Steels

    (Received 11 July 2006; accepted 22 June 2007)

    Published Online: 2007

    CODEN: JAIOAD

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    Abstract

    Irradiation hardening and microstructural change of oxide dispersion strengthened (ODS) ferritic steels were investigated by using the ion-irradiation technique. The material used for the present study was K3 (16C-2W-0.3Ti-4.6Al-0.4Y2O3) ODS ferritic steel for the application to Generation IV concept advanced reactors and fusion reactors. 6.4 MeV Fe3+ ions were used to irradiate to the K3 ODS steel by using a 1.7 MeV tandem accelerator. The irradiation temperatures were 300°C and 500°C. The nominal displacement damage rate and total displacement damage were 1×10−3 dpa/s and up to 10 dpa at about 600-nm depth from the irradiated surface, respectively. Nano-indentation hardness was evaluated with a Berkovich indenter. After the ion-irradiation at 300°C up to 1 dpa, the normalized nano-indentation hardness (hardness after irradiation/hardness before irradiation) of the K3 ODS steel reached about 1.28 and the value showed no change up to 10 dpa. On the other hand, the ion-irradiation at 500°C up to 10 dpa showed no significant irradiation hardening. TEM observation revealed that dense and fine dislocation loops were formed in the ion-irradiated steels at 300°C, which were probably enough to explain the irradiation hardening.


    Author Information:

    Yutani, Kentaro
    Graduate Student, Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto

    Kasada, Ryuta
    Research Associates and Professor, Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto

    Kishimoto, Hirotatsu
    Research Associates and Professor, Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto

    Kimura, Akihiko
    Research Associates and Professor, Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto


    Stock #: JAI100701

    ISSN: 1546-962X

    DOI: 10.1520/JAI100701

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    Author
    Title Irradiation Hardening and Microstructure Evolution of Ion-irradiated ODS Ferritic Steels
    Symposium 23rd Symposium on Effects of Radiation on Materials, 2006-06-15
    Committee E10