Magnetic and microstructural characterization of cold rolled UNS S31803duplex stainless steel

Abstract

Duplex stainless steel presents an attractive combination of mechanical properties and resistance to corrosion. These properties rely on a two-phase mixture compound to produce a microstructure that is approximately equal for the ferritic and austenitic phases. The samples used in this study were cold rolled to degrees of deformation of 20%, 40%, 60% and 80% according to their thickness. The vibrating sample magnetometer (VSM), X-ray diffraction (XRD), and optical microscopy were used to characterize the rolled samples. It was observed that the cold rolled samples of 40%, 60% and 80% showed an increase in saturation magnetization compared to the samples of as received and cold rolled of 20%, and this probably occurred because of the formation of strain-induced martensite. It can be seen that the amount of the ferromagnetic phase calculated by ferritoscope tends to decrease with an increasing degree of deformation. The deformation caused by cold rolling resulted in a significant change in diffraction peaks and the mechanical and magnetic properties.