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The changes in the mechanical properties of AISI type 347 stainless steel produced by irradiation at ∼120 F to 5.7 × 1021 and 1.2 × 1022 neutrons per sq cm have been determined by tension, impact, and hardness tests. The ultimate strength was increased from 90,000 to 114,000 psi, yield strength was increased from 38,000 to 104,000 psi, and elongation was reduced from 64 to 30 per cent at 75 F. Somewhat smaller changes were obtained at 600 F test temperature. A 1-hr anneal at 1800 F removed all effects of irradiation produced by 1.2 × 1022 neutrons per sq cm and reduced tensile properties at 75 F to essentially the same values as the unirradiated 347 stainless steel. Increased hardness of 347 steel resulting from irradiation was not removed by annealing at 600 F. The energy absorbed at fracture on irradiated Charpy V-notch specimens was 65 ft-lb at 75 F and 20 ft-lb at - 300 F. Sufficient ductility in combination with the increased yield strength would appear to be more than adequate to warrant the service of this material in reactor environments of approximately 120 F to neutron exposures of 1.2 × 1022 neutrons per sq cm.
Shober, F. R.
Research Associate, Battelle Memorial Inst., Columbus, Ohio
Murr, W. E.
Research Engineer, Battle Memorial Inst., Columbus, Ohio