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Evaluation of Crack Growth Rates and Microstructures Near the Crack Tip of Neutron-Irradiated Austenitic Stainless Steels in Simulated BWR Environment by Yasuhiro Chimi; Shigeki Kasahara; Hitoshi Seto; Yuji Kitsunai; Masato Koshiishi; Yutaka Nishiyama is a book available to read on EtoBox.

What is Evaluation of Crack Growth Rates and Microstructures Near the Crack Tip of Neutron-Irradiated Austenitic Stainless Steels in Simulated BWR Environment about?

In order to understand irradiation-assisted stress corrosion cracking (IASCC) growth behavior, crack growth rates (CGRs), locally deformed microstructure, and oxide film properties for neutron-irradiated austenitic stainless steels (SSs) are investigated. Crack growth rate tests have been performed in simulated Boiling Water Reactor (BWR) water conditions (at \*288 °C) on a neutron-irradiated 316L SS at \*12-14 dpa. After the crack growth rate tests, the microstructures near the crack tip of the CT specimens are examined with scanning transmission electron microscope (FE-STEM). In comparison with a previous study at <\*2 dpa, the irradiated 316L SS at \*12 dpa shows a less benefit of low electrochemical corrosion potential (ECP) conditions on CGR. An inactive crack tip immersed over 1000 h was filled with oxides, while almost no oxide film was observed near the active crack front in the low-ECP conditions. In addition, a high density of deformation twins and dislocations were found near the fracture surface of the crack front. It is considered that both localized deformation and oxidation are possible dominant factors for the SCC crack growth in highly irradiated SSs.

Author

Yasuhiro Chimi; Shigeki Kasahara; Hitoshi Seto; Yuji Kitsunai; Masato Koshiishi; Yutaka Nishiyama

Publisher

Springer International Publishing : Imprint : Springer

Published

2017

Language

EN

ISBN

9783030046385

Subjects

Engineering, Science, Stem