Dependence of Plastic Properties of Metals on the Density of Energy Absorbed during Deformation


Energy consumption of cold plastic deforming the mate-rials determines the efficiency of technological methods and their competitiveness. Specific energy consumption of deforming the materials used often to analyze these processes should be determined for scientific and practical interest. This subject is covered in the articles little. Therefore, the main objective of the present research was to investigate the plastic deformation of metals depending on the density of the energy absorbed during the process of their cold deforming performed in three different stretching ways: quasi-static, shock-impact and pulse electrohydraulic. Specimens of 6111, ВН240 and DP780 alloys were stretched quasi-static at deforming rates in the range 0.1 to 0.3 s-1. Work of stretching and the density of the energy absorbed within the deformed section of a sample depending on the plastic deformation were obtained from the diagrams. Shock-impact stretching of these same alloys was performed at rates of 200 to 2000 s-1 using the method of Kolskiy and a Hopkinson dissected bar. In this study a scheme of stretching flat samples without stretching a Hopkinson bar was worked out. Pulse electrohydraulic method was used for biaxial deforming the plates. The amount of energy released in a discharge channel, the energy of deforming the specimens and their own deformations equivalent to uniaxial stretching were determined. It was found out as a result of the research that the average deformation on the volume of the plate equivalent to uniaxial stretching the alloys is independent actually on the parameters of pulse electrohydraulic deforming. But the density of the energy absorbed within the alloy during deforming, a deforming rate and a type of the alloys have crucial influence on it. High speed deforming of the high hard steels at rates up to 1000 s-1 requires 25% as much energy as static deforming. The geometrical characteristics of the discharge chamber and rigging affect the efficiency of the process of deforming the sheet metal alloys significantly.

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