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非線形渦電流法によるオーステナイト系ステンレス鋼の材料劣化診断

Evaluation of material degradation of austenitic stainless steels based on nonlinear eddy current method

内一 哲哉*; 高木 敏行*; 根本 義之  ; 高屋 茂 ; 欅田 理*

Uchimoto, Tetsuya*; Takagi, Toshiyuki*; Nemoto, Yoshiyuki; Takaya, Shigeru; Keyakida, Satoshi*

本研究では、非線形渦電流法によるオーステナイト系ステンレス鋼の、照射誘起応力腐食割れに関連した材料劣化診断の可能性を検討した。そのため照射誘起偏析模擬材の高温での引張り試験を行い、その前後での非線形渦電流法による評価を行った。さらに磁気力顕微鏡による引張り試験片の微視的な磁気特性の評価を行った。その結果、結晶粒界でのCr欠乏とNi富化に関連した磁性相の生成により、非線形渦電流法における検出信号の高調波比が変化することを確認した。

This paper discusses feasibility of non-linear eddy current method to evaluate material degradations of austenitic stainless steels associated with irradiation assisted stress corrosion cracking. For the purpose, tensile test at elevated temperature was conducted on materials simulating radiation-induced segregation, and non linear harmonic analysis of eddy current was carried out for the tensile test specimens. In addition, microstructure of magnetization of the tensile test specimens was observed by magnetic force microscopy. It was shown that non linear harmonics of eddy current is associated with the Cr depletion and Ni enrichment at grain boundary and intragranular phase transformation.

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