Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 761, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138026
Keywords
Electroplastic; Residual stress; Electron wind force; Frank-read source; Dislocation structure
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Funding
- National Natural Science Foundation of China [51601011, 51874023, U1860206]
- Fundamental Research Funds for the Central Universities
- Recruitment Program of Global Experts
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In this study, the effect of high current density electropulsing (10(3) A/mm(2) for 150 mu s) on the residual stress of quenched steel was investigated with the objective of determining the electroplastic effect on plastic strain and dislocation evolution. The residual stress and dislocation density, which were closely related to the plastic strain, were significantly reduced through electropulsing. The direct effect of drift electrons on the dislocation motion, instead of side effects such as skin, pinch, instantaneous thermal expansion stress, and Joule heating, primarily contributes to the plastic strain. Employing the thermally activated plastic flow concept, the drift electrons were also found to have an effect on the thermally activated dislocation motion in addition to the force exerted on the dislocations by an electron wind. Under the action of drift electrons, the movement of vacancies and dislocations were enhanced, which accelerated the dislocation annihilation. In contrast, affected by the electron wind force, Frank-Read source failed to produce a large amount of dislocations, thereby simultaneously decreasing the dislocation multiplication rate. Finally, the dislocation density decreased and the dislocation structure was rearranged parallel to the direction of motion of the drift electrons.
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