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

ABSTRACT

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.

KEYWORDS:

• SPIF
• FLD
• SEM fractography
• EDX
• corrosion analysis
• numerical simulation

Author contributions

All listed authors meet the ICMJE criteria. We attest that all authors contributed significantly to the creation of this manuscript, each having fulfiled criteria as established by the ICMJE. All authors read and approved the final manuscript.

Competing interests

The authors have no relevant financial or non-financial interests to disclose.

Data availability statement

The experimental datasets obtained from this research work and then the analysed results during the current study are available from the corresponding authors on reasonable request.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.