SYMPOSIA PAPER Published: 01 January 2002
STP10822S

In-Beam Fatigue Response of a Low Activation Ferritic Steel at 60°C

Source

Fatigue response was investigated for a low activation ferritic steel, F82H, under in-beam (dynamic), post-irradiation (static) and unirradiation conditions with 17 MeV protons at 60°C. Miniaturized specimens with a side notch in gauge were tested in a stress-control mode with triangular wave at two different loading ratios; R (σmaxmin) = 0.44 (375 MPa ↔ 165 MPa) and R = 0.2 (375 MPa ↔ 75 MPa). Fracture surfaces were examined by a scanning electron microscope (SEM) for all specimens. Some evidence of the dynamic irradiation effect on fatigue response was observed in both fatigue tests and the SEM evaluations. The dynamic effect was more influential than the static effect at R = 0.44, while it was suppressed at R = 0.2 where the larger loading amplitude was imposed on the specimen. Balance between defect flux and fatigue damage development would control the dynamic irradiation effect.

Author Information

Murase, Y
National Research Institute for Metals, Ibaraki, Japan
Nagakawa, J
National Research Institute for Metals, Ibaraki, Japan Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan
Yamamoto, N
National Research Institute for Metals, Ibaraki, Japan
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Details
Developed by Committee: E10
Pages: 211–220
DOI: 10.1520/STP10822S
ISBN-EB: 978-0-8031-5465-0
ISBN-13: 978-0-8031-2897-2