抄録
The work-hardening characteristics of anisotropic tensile deformations and the corresponding residual strain changes of pre-strained ferrite single-phased steels without and with aging treatment were investigated by using in-situ neutron diffraction. The plastic deformation along the pre-strained direction shows discontinuous yielding behavior at the beginning stage. On the other hand, the plastic deformation perpendicular to the pre-strained direction shows continuous yielding. An anisotropy of mechanical property in steel is induced by deformation direction and strain ageing. As a result, the tensile and compressive residual strains were found in the <200> and <110> grains along the pre-strained direction, respectively. It is also found that the work hardening rate along the pre-strained direction is higher than that of perpendicular to the pre-strained direction after strain-ageing, resulting in the deference of residual strain among the crystal orientations.
