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Engineering Physics Colloquium

Tuesday, March 20

3:45 PM to 5:00 PM

106 Engineering Research Building

Speaker:  Dr. Frank Garner, Radiation Effects Consulting
"Void Swelling and Irradiation Creep of Ferritic-Martensitic Alloys at Very High Radiation Doses"
Abstract:  In a nuclear reactor, the steel making up the reactor is subject to intense radiation for long exposure times. The doses are measured in displacements per atoms (dpa). Doses in present reactors may be 100 dpa, and future reactor concepts envision doses as high as 600 dpa. A review is presented of recent high-dose irradiation studies on HT9 and EP-450 conducted in FFTF and BOR-60 with maximum doses of 200 and 163 dpa, respectively, and also on EP-450, EP-823 and EP-852 irradiated side-by side in BN-350 to doses of 61 dpa. Additionally data on MA957 are available from FFTF to ~100 dpa. Irradiation creep strains in these ferritic-martensitic steels have been found to be less by a factor of ~2 compared to austenitic steels, but creep strains are sometimes obscured by concurrent precipitation and recovery strains, often of opposite sign. Dispersoids in MA957 were found to reduce thermal creep at higher temperatures but not to reduce irradiation creep to doses of ~100 dpa. 
Biography:  For four decades Frank Garner has played a prominent role in the international radiation damage and nuclear reactor communities as a technical contributor and a scientific leader. Dr. Garner received his B.Sc in Chemical Engineering, (1963) and D.Sc in Nuclear Engineering with Materials emphasis (1970) from the University of Virginia in Charlottsville.