検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

オーステナイトステンレス鋼の中性子照射による磁気特性変化に関する研究

Study on magnetic property change on neutron irradiated austenitic stainless steel

根本 義之; 大石 誠; 伊藤 正泰; 加治 芳行

Nemoto, Yoshiyuki; Oishi, Makoto; Ito, Masayasu; Kaji, Yoshiyuki

これまで原子炉構造材として使用されるオーステナイトステンレス鋼の中性子照射に基づく材料劣化をき裂等の発生以前の予兆段階で渦電流法、交流磁化法等の磁気的手法により検知する技術開発に関連した研究成果を報告してきた。SUS304等の材料では照射以前から材料中に存在するフェライト相等の磁性相からの磁気信号が、照射による磁気変化の検知を阻害する可能性が考えられるため、本研究では、SUS304照射材の磁気測定を行い、照射量に依存した磁気変化が検知可能であることを確認した。また粒界割れ等の材料劣化と磁気データの相関に関与すると考えられる、照射材の結晶粒界での磁性相生成を透過型電子顕微鏡観察により確認した。以上の成果を報告する。

Authors previously reported that Eddy current method and AC magnetization method have potential to be applied for development of diagnostic technics to detect the sign of material degradation before cracking on the austenitic stainless steels used as structural material in nuclear power plants. In typical austenitic stainless steels such as type304, magnetic ferrite phase would exist in the alloy before irradiation, and it is concerned to disturb the magnetic measurement on irradiated material. Magnetic measurements were conducted in this work on type304 austenitic stainless steel specimens irradiated up to different doses. In addition, microstructure observation was conducted on the area including grain boundary to discuss the correlation of magnetization on irradiated austenitic stainless alloy and grain boundary cracking. Obtained magnetic data on irradiated type304 stainless steel were seen clearly different from that on un-irradiated specimen, and showed positive correlation with radiation dose, therefore it was thought that magnetic measurement technics can be applied for the material which contains certain quantity of ferrite phase before irradiation. In the microstructural observation, magnetic phase (FeNi$$_{3}$$) formation along the grain boundary was revealed.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.