Mechanical Response of TWIP Steels Deformed by ECAP
TWIP steels are high Mn steels which exhibit outstanding mechanical properties,i.e.high strength,high ductility and high strain hardening rate.This combination of properties is possible because twinning acts as a deformation mechanism.Moreover,TWIP steels also follow the Hall-Petch relationship which indicates the inverse proportionally of the yield strength with the grain size of the material.Therefore,fine-grained microstructures are usually desired in order to optimize the mechanical properties of TWIP steels.Conventional processing routes,which imply hot rolling followed by cold rolling to obtain thin sheets,usually generate grain sizes as small as a few micrometers.A further reduction of the grain size to the submicron scale can be achieved by other processing routes such as Equal Channel Angle Pressing (ECAP).The effect of the grain size on the mechanical properties for ultrafine-grained TWIP steels is still under discussion,since the twinning ability of these steels could be affected by such a reduction of the grain size.In this work,ECAP was applied to a TWIP steel to refine its microstructure and the effect of the number of ECAP passes on the mechanical properties of the material will be analyzed.In general,the yield strength increased from 188MPa in the annealed condition to 1530MPa after four deformation passes and the ductility was reduced from 37% to 8.5%.
TWIP steel ECAP mechanical properties microstructure
WANG Lei CALVO Jessica BENITO Jose Antonio CABRERA José María
Universitat Politècnica de Catalunya, Barcelona, Spain
国际会议
成都
英文
367-370
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）