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
著者:
野際 公宏 Kimihiro NOGIWA 鬼塚 貴志 Takashi ONITSUKA 阿部 輝宜 Teruyoshi ABE 中村 孝久 Takahisa NAKAMURA 榊原 安英 Yasuhide SAKAKIBARA
発刊日:
公開日:
atom probeATR Fugencast austenite stainless steel (CASS)Charpy impact testprediction modelrecirculation pump casingthermal aging embrittlement
概要
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 oC. 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.
