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Vol.6 No.4previous AA 82-SP13 (83-84-85-86)-NT67-68

Academic Articles
Regular Paper Vol.6 No.4 (2015) p.146 - p.152
 

Research of Estimation Method of Thermal Aging Embrittlement on Cast Austenitic Stainless Steel

 
Teruyoshi ABE1, Kimihiro NOGIWA2, Takashi ONITSUKA3, Takahisa NAKAMURA1, Yasuhide SAKAKIBARA1
 

1 Fugen Decommissioning Engineering Center, Japan Atomic Energy Agency, 65-20 Kizaki, Tsuruga, Fukui 914-8585, Japan
2 Sumitomo Heavy Industries, Ltd., Shinagawa-ku, 2-1-1 Osaki, Tokyo 141-6025, Japan
3 University of FUKUI, 1-2-4, Kanawa-cho, Tsuruga, Fukui 914-0055, Japan

 
Abstract
Thermal aging embrittlement of cast austenitic stainless steel components from the decommissioned Advanced Thermal prototype Reactor (ATR) Fugen power station 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 °C. The Fugen serviced 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 considering activation energy for embrittlement at low service temperatures.
 
Keywords
ATR, Fugen power station, cast austenite stainless steel, thermal aging embrittlement, serviced materials, Charpy impact test, atom probe, recirculation pump casing, spinodal decomposition, H3T model
 
Full Paper: PDF EJAM Vol.6No.4 pp.146-152 "Research of Estimation Method of Thermal Aging Embrittlement on Cast Austenitic Stainless Steel"
Article Information
Article history:
Received 19 June 2014
Accepted 17 November 2014