Abstract
Results of experiments on the strain-hardening characteristics of Armco ingot iron during slow plastic deformation under tension (strain rate: 10 −4 sec 1̄) are presented. The observed anomalous effects are discussed. It is shown that the serrated stress—strain curves often observed with this type of material are a consequence of the anomalous velocity dependence of strain-hardening. In this connection a modification of the Nabarro theory of blue brittleness is tentatively proposed.
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