Abstract
Austenitic stainless steels are prominent materials for their superior corrosion resistance and a combination of strength and ductility. However, the relatively low yield strength limits its application in high strength structural applications. Cryorolling is one of the promising methods of enhancing the mechanical properties of sheet metals. In the present work, Cryorolling of UNS S31000 stainless steel resulted in five-fold enhancement in yield strength with a significant loss in ductility. However, flash annealing at 800 °C for 120 s could restore its ductility up to 50% of its original ductility. The enhancement in strength is attributed to the formation of deformation nano-twins during flash annealing along with a bimodal grain structure.
Highlights
Austenitic stainless steels are prominent materials for their superior corrosion resistance and a combination of strength and ductility
Owing to its good corrosion resistance arising from the high Cr content and single-phase microstructure, it is used for Cryogenic tanks of missiles, space vehicles etc[2]
The present study investigates the effect of rolling at room temperature and Cryogenic temperatures on the mechanical properties of UNS S31000 stainless steel
Summary
Austenitic stainless steels are prominent materials for their superior corrosion resistance and a combination of strength and ductility. In the present work, Cryorolling of UNS S31000 stainless steel resulted in five-fold enhancement in yield strength with a significant loss in ductility. Austenitic stainless steel (UNS S31000) exhibits excellent high temperature properties along with good corrosion resistance. UNS S31000 stainless steel sheet products are generally produced by hot rolling of slabs, and possess a relatively low yield strength of around 250–300 MPa. it is highly desirable to enhance their strength, but without sacrificing their corrosion resistance and ductility. Rezaee et al Investigated increase of strength by developing ultrafine grained microstructure produced by cold rolling of low nickel stainless steel followed by annealing at 850 °C11. The present study investigates the effect of rolling at room temperature and Cryogenic temperatures on the mechanical properties of UNS S31000 stainless steel. Since an enhancement in the strength is often associated with a reduction in ductility, we have investigated three levels of flash annealing to optimize the recovery of ductility
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