발간논문

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Vol.17, No.3, 231 ~ 239, 1979
Title
Serrated Flow and Thermomechanical Treatment
김인섭 In Sup Kim
Abstract
Serrated flow or Portevin-Le Chatelier effect is made through the intermittent locking of mobile dislocations by diffusing solute atmosphere within certain temperature and strain rate range. This dynamic strain ageing phenomena appear as the serrated flow curve which has one to one correspondence with Luders band propagation. The frequent locking of mobile dislocations induces enhanced dislocation multiplication and high work hardening. Second phase precipitation on the uniform and dense dislocation substructure does not deteriorate the durability of the dynamically strain aged material significantly while improving its strength. Such a thermomechanical treatment is reviewed on a low carbon steel, high strength low alloy steels, and 7075 aluminum alloy.
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