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In order to estimate the magnitude of irradiation creep induced stress relaxation, torsional creep tests were conducted on cylindrical Inconel 718 specimens under 17 MeV proton irradiation at 400 degrees Celsius 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. The tests show that the stress dependence of the irradiation creep rate is linear up to about 250 MPa and quadratic for higher stresses.

As a conclusion, in the stress range of interest, which lies between 50% and 80% or 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: Fusion Engineering and Design, 51-52 (2000) pg. 165-170. Oral report given in: ISNFT-5 Conference. Organised by: ENEA. Held in: Rome, 19-24 September, 1999
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