FEATURES OF DYNAMIC STRAIN AGING DEVELOPMENT IN CARBON STEEL DURING REVERSE LOADING
DOI:
https://doi.org/10.34185/1991-7848.itmm.2026.01.011Keywords:
carbon steel, dynamic strain aging (DSA), dislocation, temperature, strain hardening, plasticizationAbstract
The study evaluates the possibility of increasing the ductility of cold-drawn carbon steel by utilizing controlled dynamic strain aging (DSA) processes under alternating deformation. It was found that a change in the deformation sign (compression-tension) leads to a shift in the onset of flow stress serrations toward higher strain levels compared to unidirectional tension. Based on the analysis of the stress of unrevised motion of dislocations and the strain hardening coefficient, it is shown that the suppression of DSA during reverse loading is caused by a disruption in the kinetic relationship between the dislocation waiting time and the duration of their free motion. An optimal temperature range for alternating bending (250–275 °C) was identified, which ensures the realization of kinetic conditions for stabilizing DSA processes to enhance the plasticity of high-carbon wire without compromising its strength properties. It is proved that heating above 275 °C violates this condition, leading to the degradation of mechanical properties. The practical value lies in justifying the necessity of forced cooling of the metal after deformation.
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