DETERMINATION OF RESIDUAL-STRESSES IN BCC METALS SUBJECTED TO DEEP AXISYMMETRICAL DEFORMATION

The effect of the plastic anisotropy of a bce lattice on residual stre sses was analyzed in deep drawing of the material. It is shown that te nsile stresses in the [001] direction and compressive stresses in the [110] direction arise in individual crystallites when the [110] axis c oincides with the axis of deformation. These stresses, called mesostre sses, cause the nonlinearity of the dependence of d(hkl) On sin(2) psi that observed in cold-drawn steels. The dependences calculated for th e {211}, {310}, {220}, and {200} reflections agree with experimental d ata. The method proposed provides for the evaluation of residual macro stresses and residual mesostresses that are active on the scale of ind ividual crystallites in metals and alloys with a hoc lattice that have undergone a deep axisymmetric deformation.