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Stress Corrosion Cracking Behavior of Dissimilar Metal Weldments in High Temperature Water Environments

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Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors

Abstract

The stress corrosion cracking behavior of dissimilar metal (DM) welds, including Alloy 52-A 508 and Alloy 82-A 508, under simulated BWR coolant conditions was studied. Effects of postweld heat treatment and specimen size on the corrosion fatigue and SCC growth rates of DM welds were evaluated. The crack growth rates of the DM weld heat-treated at 621 °C for 24 h was observed to be faster than those for the as-welded. But the DM weld heat-treated at 621 °C for 8 h + 400 °C for 200 h showed better SCC resistance than the as-welded. The longer the heat treatment at 621 °C, the higher the chromium carbides density along the grain boundary was observed. The SCC growth rates observed for the 1/2T CT specimens were faster than those for 1T CT specimens. It could be accounted for by the shorter distance for oxygen and anions to diffuse to the crack tip in the thinner specimen.

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Authors and Affiliations

  1. Institute of Nuclear Energy Research (INER), 1000 Wenhua Road, Longtan, Taoyuan, 32546, Taiwan

    J. Y. Huang, M. F. Chiang, R. C. Kuo, J. S. Huang & S. L. Jeng

Authors
  1. J. Y. Huang
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  2. M. F. Chiang
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  3. R. C. Kuo
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  4. J. S. Huang
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  5. S. L. Jeng
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Editor information

Editors and Affiliations

  1. Oak Ridge National Laboratory, USA

    Jeremy T. Busby

  2. Electric Power Research Institute, USA

    Gabriel Ilevbare

  3. GE Global Research Center, USA

    Peter L. Andresen

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© 2011 TMS (The Minerals, Metals & Materials Society)

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Huang, J.Y., Chiang, M.F., Kuo, R.C., Huang, J.S., Jeng, S.L. (2011). Stress Corrosion Cracking Behavior of Dissimilar Metal Weldments in High Temperature Water Environments. In: Busby, J.T., Ilevbare, G., Andresen, P.L. (eds) Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors. Springer, Cham. https://doi.org/10.1007/978-3-319-48760-1_67

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