Abstract
The role of dislocation cell structure is well established in the work hardening of metallic materials. The cell diameter in transmission electron microscopy specimens taken at various places along the gauge length of broken specimens of a low alloy steel containing niobium was correlated with the local strain. Also, microhardness measurements were made and the variation in hardness with strain was obtained. It is shown that the cell size decreases with increasing strain until a critical size is reached. After this critical size, the cell size remains constant, even while work hardening continues but apparently with decreasing rate as in stage III. These results are consistent with the principle of “similitude” in stage II and support the hypothesis of the mesh length theory of work hardening that stage III arises when dislocation cells cease to shrink and similitude breaks down.
Published Version
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