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The effects of fast reactor irradiation conditions on the tensile properties of two ferritic/martensitic steels

Author:
Stuart A. Maloy   M.B. Toloczko   K.J. McClellan   T. Romero   Y. Kohno   F.A. Garner   R.J. Kurtz   A. Kimura  


Journal:
Journal of Nuclear Materials


Issue Date:
2006


Abstract(summary):

Tensile testing has been performed at 25 and at ~400degC on two ferritic/martensitic steels (JFMS and HT-9) after irradiation in FFTF to up to ~70dpa at 373-433degC. As observed in previous studies, this range of irradiation temperatures has a significant effect on hardening. The percent increase in yield stress decreases with increasing irradiation temperature from 373 to 433degC. The JFMS alloy, which has 0.7wt% silicon, exhibits approximately a factor of two increase in yield strength between tests at 427 and at 373degC, and shows an increase in hardening with increasing dose. A comparison of the JFMS tensile properties to the properties of other ferritic/martensitic steels suggests that this hardening is due to precipitation of a Si-rich laves phase in this alloy. The HT-9 alloy, which contains more chromium and more carbon but less silicon (0.2wt%), less molybdenum and less nickel, hardens during irradiation at 373degC, but shows less hardening for irradiations performed at 427degC and no increase in yield stress with increasing dose beyond 10dpa. [All rights reserved Elsevier]


Page:
62-69


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