OBRABOTKAMETALLOV Vol. 25 No. 3 2023 technology Fig. 3. Surfaces of metal flow velocity vectors of layers during accumulative roll bonding with thickness reduction ratio of 45 % composite is plotted along the abscissa (0 is the lower surface of the composite, and 1 is the upper surface of the composite). In fig. 4, attention should be given to the increase in the inhomogeneity of the effective strain ei with an increase in reductions during rolling. At a low reduction ratio of 30 %, the deformation inhomogeneity across the layers is practically indiscernible, and the difference between the maximum and minimum values is 0.02. With an increase in reductions, the inhomogeneity of effective strain ei becomes more pronounced and reaches a maximum at the highest reduction of 75 %, with a difference between the maximum and minimum value equal to 0.17. It should be noted that at reductions up to 65 %, the middle layer of the composite from D16 alloy is characterized by lower values of the effective strain ei. This is consistent with the distribution pattern of the layer flow velocity vectors and the conclusion about the lag of the flow velocity of the central layer from those of the outer layers. Fig. 4. Distribution of effective strain in the cross section of composites depending on thickness reduction during rolling
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