In site strain measurement of ferrite matrix in cold drawn pearlite steel during tensile loading by neutron diffraction

Shiota, Yoshinori; Tomota, Yo*; Harjo, S.   ; Kamiyama, Takashi*

In our previous report on in site neutron diffraction during tensile loading for heavily drawn ferrite and pearlite steels, two points were made clear. One is stress partitioning between the ferrite matrix and the cemente phases for the patented pearlite steel. Another one is the nonlinear elastic deformation above the external stress of 3GPa in the heavily drawn pearlite steel. However, these measurements were performed by the angler dipersion mehteod for {110} planes along the tensile direction, the effect of texture has not been considered. Hence, diffraction from {hkl} planes both in the tensile and transverse directions were observed in this study. Beacuse strong {hkl}110 fiber formed during severe deformation, the strain behavior was similar to that deformation of {hkl}110 single crystal. As the axis of principal stress is 110 lattice direction, transverse {hkl} deformation in cubic system possessed elastic anisotropy.