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Effects of thermal aging and stress triaxiality on PWSCC initiation susceptibility of nickel-based Alloy 600

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Abstract

In present study, effects of thermal aging and triaxial stress were investigated in terms of primary water stress corrosion cracking susceptibility. The thermal aging was applied via heat treatment at 400°C and triaxial stress was applied via notched tensile test specimen. The crack initiation time of each specimen were then measured by direct current potential drop method during slow strain rate test at primary water environment. Alloys with 10 years thermal aging exhibited the highest susceptibility to stress corrosion cracking and asreceived specimen shows lowest susceptibility. The trend was different with triaxial stress applied; 20 years thermal aging specimen shows highest susceptibility and as-received specimen shows lowest. It would be owing to change of precipitate morphology during thermal aging and different activated slip system in triaxial stress state.

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Authors and Affiliations

  1. Department of Nuclear Science and Engineering, School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology, 50, UNIST-gil, Eonyang-eup, Ulji-gun, Ulsan, 44919, Korea

    Seung Chang Yoo, Kyoung Joon Choi, Taeho Kim & Ji Hyun Kim

Authors
  1. Seung Chang Yoo
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  2. Kyoung Joon Choi
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  3. Taeho Kim
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  4. Ji Hyun Kim
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Correspondence to Ji Hyun Kim.

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Ji Hyun Kim is an Associate Professor in Department of Nuclear Engineering at Ulsan National Institute of Science and Technology, Republic of Korea. His research interests include high temperature corrosion and mechanical properties of materials, especially structural materials and fuel cladding materials of nuclear power plants. His research skills are based on simulation, modeling and experimental mechanics with fundamental and comprehensive understanding in various academic disciplines including nuclear, mechanical, and materials science and engineering.

Seung Chang Yoo is a graduate student in School of Mechanical and Nuclear Engineering of Ulsan National Institute of Science and Technology. His research interest is high temperature corrosion of nickel-based alloys, stainless steels, and dissimilar metal welds in nuclear power plant.

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Yoo, S.C., Choi, K.J., Kim, T. et al. Effects of thermal aging and stress triaxiality on PWSCC initiation susceptibility of nickel-based Alloy 600. J Mech Sci Technol 30, 4403–4406 (2016). https://doi.org/10.1007/s12206-016-0901-3

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  • DOI: https://doi.org/10.1007/s12206-016-0901-3

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