The work hardening effects due to the press working process improved tensile strength of material. The strength of mild steel sheet, that was the blank material, increased near to the 590MPa grade high tensile strength steel sheet after three stages of press working. The press-working increased the dislocation density using X-ray and Neutron diffraction technique. The dislocation cell size and shape was deeply related to the work-hardening due to the plastic deformation.
