Abstract
The internal friction has been studied as a function of the concentration of carbon or nitrogen in α-iron at two different grain sizes and upon quenching from various temperatures. It is found that grain boundaries reduce the mobility of the interstitial atoms and that carbon probably is enriched in grain boundary films with rather high carbon content, both phenomena decreasing the internal friction. The solubility of carbon in α-iron increases the smaller the grain size. The influence of 0.08 per cent of manganese contained in the test material is briefly discussed, and a calculation of the influence of preferred orientation on the internal friction is given.
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