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This report describes an evaluation of Charpy test data from high-copper, low Charpy upper-shelf energy, Linde 80 submerged-arc weld metals furnished by the Babcock & Wilcox (B&W) Owners Group for irradiation and testing as a part of the Second and Third Irradiation Series of the Heavy Section Steel Technology (HSST) Program at Oak Ridge National Laboratory for a timely study of the effects of neutron radiation. The HSST data was evaluated to provide a large data base from which to evaluate the effects of neutron radiation on the Charpy impact test results. The specimens were irradiated over a range of temperatures and fluence values. These specimens were grouped by the irradiation temperature and fluence so as to minimize the standard deviation value for both properties. The upper-shelf energy, the 30-ft-lb (40.7-J) transition temperature, and the 50-ft-lb (67.8-J) transition temperature were reevaluated. These Charpy transition temperature and upper-shelf energy values are significantly different from the comparable values previously reported by the HSST Program. The upper-shelf energy values and 30-ft-lb (40.7-J) transition temperatures for each data subset are summarized. From these data, one author was able to determine the effect of irradiation temperature on the change in Charpy impact properties.
Charpy impact data, neutron fluence, submerged-arc weld metal, Linde 80 weld metal, irradiation temperature, reactor vessel weld metals, neutron radiation
Lowe, Arthur L.
Advisory engineer (materials), Babcock & Wilcox, A. McDermott Company, Lynchburg, VA