Evaluation of Closed Stress Corrosion Cracks in Ni-Based Alloy Weld Metal Using Subharmonic Phased Array
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概要
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Closed stress corrosion cracks (SCCs) have been generated in Ni-based alloy weld metal in nuclear power plants. The ultrasonic inspection is difficult because of the crack closure. For the application of new inspection methods and training/educating of inspection engineers, realistic closed SCC specimens are required. However, there is no means for forming such SCC specimens in a reasonable amount of time. Here, we present a two-step method. The first step is to form an open SCC in chemical solution. The second step is to close the SCC by generating oxide films between the crack faces in high-temperature pressurized water (HTPW). To verify the crack closure, we used a closed-crack imaging apparatus, the subharmonic phased array for crack evaluation (SPACE). Consequently, we found that parts of the SCC after 1321 h immersion were closed in the HTPW. Thus, we verified the two-step method for forming realistic closed SCC specimens in a reasonable amount of time.
- 2012-07-25
著者
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Ohara Yoshikazu
Department Of Cardiology Kochi Health Sciences Center
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Yamanaka Kazushi
Department Of Applied Physics Faculty Of Engineering University Of Tokyo:(present Address)mechanical
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SHINTAKU Yohei
Department of Materials Processing, Faculty of Engineering, Tohoku University
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Horinouchi Satoshi
Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan
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Ikeuchi Masako
Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan
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