Suppression of trip effect in metastable steel by electrical current

V.V. Stolyarov, E.A. Klyatskina, V.F. Terentyev


The work deals with a possible application of current at deformation processes. The literary analysis has shown existence of articles on electroplastic effect in single-phase materials without phase transformations and lack of works on a research of current impact on deformation behavior in materials with phase transformation. Therefore, influence of current regimes and current mode on deformation behavior of TRIP steel in austenite-martensie and completely martensite states is investigated . Tensile tests, the X-ray diffraction analysis and the scanning electron microscopy observations of fracture are used. For lack of current steel in austenite- martensite state at tension displays martensitic transformation that leads to an excellent combination of mechanical properties - the high ultimate tensile stress and preservation of initial plasticity. It is shown that in austenite-martensite the stress-strain tension curve shape and a type of the serrated plastic flow current jumps conditioned by martensite transformation and electroplastic effect depend on current mode. Single current pulses practically don't influence on mechanical properties and thedeformation behavior. The multipulse and direct current is caused the considerable thermal effect, decrease in electroplastic effect and TRIP effect suppression. As a result both ultimate tensile stress and elongation to failure decreases. The steel in martensite state doesn't display TRIP effect at tension with current indue to the lack of the return transformation, and elongation to failure sharply decreases. The failure type of samples for both states, irrespective of current, occurs on the mechanism of a viscous separation or shift.

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