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Both flat tensile specimens and small compact-tension specimens of the martensitic 11Cr steel Type DIN 1.4914 have been irradiated to 5 dpa at 525 K and to 10 dpa at 625 K and 725 K. Tensile tests and fracture mechanics experiments have been performed at the irradiation temperatures. Irradiated specimens and thermal control specimens were tested at fully identical conditions. The 0.2 yield stress increased with about 400 MPa to values of about 950 MPa after irradiation at 525 K and 625 K, whereas irradiation at 725 K resulted in minor radiation hardening. The total elongation values were not less than 5-5% strain. The irradiation effect on the subcritical fatigue crack growth rates in the ΔK-domain of 15–40 MPa√m was minor (less than a factor 2). The fracture toughness parameters J0.2 and dJ/da were strongly reduced at all test temperatures.
neutron irradiation, martensitic steel, tensile properties, fatigue crack growth rate, fracture toughness
de Vries, MI
Business Unit Nuclear Energy, Netherlands Energy Research Foundation, ECN, LE PETTEN,