High-Speed Erichsen Testing of Grain-Refined 301LN Austenitic Stainless Steel Processed by Double-Reversion Annealing

Abstract Austenitic Cr–Ni stainless-type 301LN steel was subjected to a double-reversion annealing (DRA) treatment develop bulk grain-refined microstructures. The tensile properties and formability of the DRA structures were determined by high-speed Erichsen cupping tests at strain rate 1.5 s ?1 (50 mm ) compared with those coarse-grained steel. Detailed microstructural features characterized using electron backscatter diffraction technique X-ray analysis. achieved for 1 second 800 °C 900 exhibited superior combination yield (~ 950 770 MPa, respectively) 1050 strengths ductility 35 40 pct, respectively, as well reasonable index values under biaxial strain. Due adiabatic heating, had higher austenite stability during stretch forming, i.e. , less prone strain-induced martensitic transformation. finite-element method (FEM) used conduct coupled field thermomechanical analyses deformation processes structures. Comparison FEM experimental results revealed considerable influence 20 pct) transformation on temperature rise. balance strength value developed nanograined microstructure is comparable that commercial