A new processing route to develop nano-grained structure of a TRIP-aided austenitic stainless-steel using double reversion fast-heating annealing

A novel processing route comprising double reversion annealing (DRA) was designed for developing bulk nano-grained (NG) structure of an austenitic stainless steel (Type 301LN). The new concept DRA comprised two subsequent intrinsic type processes i.e., times cold reductions (~53% and 63%) followed by fast induction heating (~200 °C/s) short duration at different temperatures (first 690 °C/60s second 750–900 °C/0.1–1s). NG revealed a remarkable improvement the mechanical properties compared to counterparts processed single annealing. Furthermore, outstanding combination strength formability is achieved structures, significantly higher than those high-Mn TWIP steels, low-alloy TRIP steels 304 steel. For instance, superior yield (~950–1030 MPa) index (11.8–12.5 mm) obtained after 750 °C/0.1s 800 °C/1 s, respectively. However, corresponding values are 300 MPa 12 mm 500 10 270 In order reveal effect on stretch formability, Erichsen cup testing conducted both initial specimens. Moreover, also simulated finite element method (FEM) survey further details their deformation.