Laser bending of steel sheets: Corrosion testing of bended sections

Purpose - Laser bending is a good candidate to replace the flame bending process. The electrochemical response of laser bending region changes due to the microstructural modifications and high level of residual stress developed in the laser-irradiated region after the bending process. Consequently, investigation into laser bending and microstructural changes in the irradiated region as well as the electrochemical response of bending section becomes essential. This paper aims to focus on the laser bending process. Design/methodology/approach - The laser bending of steel sheets was carried out. The microstructural changes in the bending region are examined using the scanning electron microscopy and X-ray diffraction. The electrochemical response of the bended sections is investigated through potentiodynamic tests. Findings - It is found that laser-irradiated surface is free from cracks and cavitations. However, deep pit sites due to secondary pitting are observed in the bending sections. Research limitations/implications - The experiment is limited to certain thickness of the steel sheets. Increasing workpiece thickness reduces the bend angle. However, introducing high-intensity laser beams improves the bend angle on the expense of high surface roughness in the bend section. Practical implications - Laser bending process is involved with non-mechanical tooling with low cost and precision of operation. Moreover, laser bending is a good candidate to replace the flame bending process. Consequently, laser bending finds application in industry. However, under the corrosive environment care should be taken. Originality/value - The work presented is original and has not been published anywhere before. The findings will be useful for researchers and engineers working in the sheet metal forming area.