Abstract
An investigation was made of the 77°K yielding behavior of ingot iron specimens that had been prestrained and aged while under stress at 303°K. It was observed that the presence of a yield point at 303°K after a strain aging treatment does not result in a yield point at 77°K until the strain aging treatment is prolonged so as to result in an increase in the 303°K yield point of about 20 per cent. The sharpness and magnitude of the yield point at both 303°K and 77°K increased with an increase in the aging time and or an increase in the stress which was maintained upon the specimen during the aging treatment. The observations of the effect of the aging time and aging stress are discussed in terms of the contribution of the dislocation line tension and solute atmosphere density along the dislocation.
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