ON THE INFLUENCE OF SMALL AMOUNTS OF IMPURITIES ON RECRYSTALLIZATION AND GRAIN GROWTH OF HIGH PURITY IRON. NOTE I. EFFECT OF INTERSTITIAL CARBON AND EFFECT OF PRECIPITATED OXIDE IMPURITIES
NATIONAL ELECTROTECHNICAL INST TURIN (ITALY)
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A study was made of the effect of small amounts of impurities on recrystallization of Fe and related effects of recovery and grain growth. Methods of preparation of high purity Fe were studied. Some pure Fe specimens were carburized at 700 C with increasing amounts of C added to the H2. These, together with other specimens of Fe of different purity, were cold worked in different amounts and the recovery and recrystallization were followed by hardness, micrographs and x rays. In pure Fe, recovery effects and recrystallization were observed much before the less pure specimens. The effect of C appears small in comparison with the effects of some substitutional elements. Preliminary measurements of grain boundary internal friction of pure Fe with different C content were performed. Displacement of the grain boundary peak was consistent with the recrystallization temperature.