Abstract
Two kinds of damage produced in cyclic creep were studied: (1) change in the dislocation density and arrangement, to be studied in copper and (2) damage phenomena perhaps involving precipitates in Cr-Mo-V rotor steel. In copper tested at low temperatures, strain bursts were recognized for the first time in polycrystals of a pure metal in both cyclic and static creep. Cyclic stress-strain response in cyclic creep was defined, and a study of single crystals carried out in order to study better the dislocation structures associated with bursts. Because of its superior quality, a Westinghouse rotor steel was eventually chosen for detailed study. Effort was directed this year on the high temperature testing apparatus. High temperature tests have been extended to lower amplitudes.
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