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In order to estimate the magnitude of irradiation creep induced stress relaxation, torsionaI creep tests were conducted on cylindrical Inconel 718 specimens under 17 MeV proton irradiation at 350 C for doses up to 0.4 dpa. In a first series of tests, the applied stress was held constant and the irradiation creep deformation was measured for stresses ranging from 20% to 90% of the yield stress. In a second series of tests, the stress relaxation was measured for a constant strain. Similar tests were conducted on 316L stainless steel samples in 20% cold-worked conditions. For both materials, the stress dependence of the irradiation creep rate is linear up to a maximum shear stress of about 150 MPa and quadratic for higher stresses.

As a conclusion, in the stress range of interest, which lies between 50%; and 80% of the yield stress, the stress relaxation is expected to be strong at the beginning of the irradiation until the limiting stress of about 250 MPa is approached..

Additional information

Authors: SCHOLZ R, JRC Institute for Health and Consumer Protection-BMS, Ispra (IT);MATERA R, JRC Institute for Health and Consumer Protection-BMS, Ispra (IT)
Bibliographic Reference: Article published in: Journal of Nuclear Materials 283-287 (2000) pp.414-417. Oral Report given at: ICFRM-9 Conference. Organised by: Pacific Northwest Labs, University of California. Held at: Colorado Springs, (US), 10-15 October, 19
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