Failure Behavior of Sensitized SUS304 Stainless Steel with Small Surface Pre-Crack under Constant Load Condition in Simulated BWR Environment
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概要
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Small surface intergranular cracks similar to those detected in the heat affected zone of the welded components of primary water recirculation loop for boiling water reactor (BWR) were introduced on the surface of sensitized SUS304 stainless steel by using a fretting fatigue technique, where multiple parallel small surface cracks in the localized fretting slip region were nucleated. Constant load tests at various initial stress intensity factors (K<SUB>i</SUB>) were then carried out in 288°C, 7.3MPa pure water, which is the operating condition for BWR, to investigate failure behavior of this material under constant load condition. From the results, it was speculated that the K<SUB>ISCC</SUB> for small surface crack was lower than 4.7MPa·m<SUP>1/2</SUP>, which was significantly low compared to that of long crack (10-20 MPa·m<SUP>1/2</SUP>).
著者
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Otsuka Yuichi
Department Of Biological Sciences Graduate School Of Science Osaka University
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Mutoh Yoshiharu
Department Of Mechanical Engineering Nagaoka Univ. Of Technology
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OTSUKA Yuichi
Department of System Safety, Nagaoka University of Technology
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SAENGSAI Anchalee
Department of Materials Science, Nagaoka University of Technology
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MUTOH Yoshiharu
Department of Material Science, Nagaoka University of Technology
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