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ステンレス鋳鋼の熱時効脆化推定法の検討

Research of estimation method of thermal aging embrittlement on cast austenitic stainless steel

野際 公宏; 鬼塚 貴志; 阿部 輝宜; 榊原 安英; 中村 孝久

Nogiwa, Kimihiro; Onitsuka, Takashi; Abe, Teruyoshi; Sakakibara, Yasuhide; Nakamura, Takahisa

廃止措置が進められている「ふげん」より採取された実機材を用いて熱時効脆化の発生状況を確認するとともに、脆化予測式モデルの妥当性について検討を行った。シャルピー衝撃エネルギーの実測値に対して、H3Tモデルによる予測値は脆化の程度を厳しく予測していることが確認された。また同時に活性化エネルギーや脆化の感受性などについて、脆化機構に基づいた検討を行うことにより、脆化予測の高精度化の余地があることが示唆された。

Thermal embrittlement of cast austenitic stainless steel components from the decommissioned advanced thermal prototype reactor "Fugen" has been characterized. Cast stainless steel materials were obtained from recirculation pump casing. The actual time at temperature for the materials was 138,000 h at 275$$^{circ}$$C. The Fugen material show modest decrease in Charpy-impact properties and a small increase in micro-Vickers hardness in ferrite phase because of thermal aging at relatively low service temperatures. The fracture toughness prediction method (H3T model) predicts slightly lower values for Charpy-impact energy obtained from the Fugen material. The results from microstructural analysis suggest that the prediction method have the potential to provide higher accuracy by considerations of the activation energy for embrittlement at low service temperatures.

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