STRAIN HARDENING OF STEEL SHEETS IN MULTI-PHASE THICKNESS REDUCTION

Abstract

The results of investigation of strain hardening phenomena in model investigated ironing process are presented. As a characteristic model we used the strip-ironing of larger thickness steel sheets between inclined die surfaces. The low carbon mild steel sheet C0148 P3, suitable for plastic forming was used. It was measured deformation force (tensile force) in conditions of changing the relevant tribo-influences in multi-phase ironing. Also, the stress intensity distribution for different conditions were obtained by using micro hardness method. Finally, the micro hardness was measured and then stress intensity fields are determined. In each phase of ironing the hardening increas was determined as well.Publishe