Formability and corrosion investigation of super-austenitic stainless steel SMO 254 using single point incremental forming

In this investigation, 1-mm-thick SMO 254 super-austenitic stainless steel sheets were incrementally formed to make straight grooves and varying wall angle cones using two types of tools under varying vertical step heights, spindle speeds and feed rates. Forming limit diagram (FLD) was plotted using the results of the straight groove test. The highest, moderate and lowest formable sheets were identified. Micrographs of the fractured surfaces were captured using SEM. It was determined that the fracture mode was ductile. Finite-element analysis of the single-point incremental sheet forming (SPIF) was carried out with the help of the Abaqus software. The apportioning of stresses, strains, frustum depth and wall thickness was attained through the simulation. The results were in better concordance with the experimental outcomes. Corrosion analysis was done using the otentioynamic olarization (PDP) technique, and the scanning electron microscope micrographs of the corroded specimen sheets were studied. Energy-dispersive X-ray spectroscopy of the corroded specimen was conducted and determined the elemental composition of different areas in the specimen. The corrosion rate of the highest formable sample was found to be less than that of the lowest formable and base metal samples. This finding leads to the conclusion that the SPIF process decreases the corrosion rate of SASS sheets.