Effect of High-Temperature Tempering on Ferrite in Fe- Mn- C Non-Magnetic Steel

Herein, the effect of coiling temperature on ferrite within Fe-23Mn-4Al-0.26C-0.15Ce nonmagnetic steel was investigated. The relationship between the coiling temperature on the ferrite and carbide precipitation phases was revealed using optical microscopy, scanning electron microscopy, transmission electron microscopy and electron probe microscopy. The reasons for the generation of the precipitated phase within δ ferrite were analyzed. The results show that the cooling of the steel plate to different temperatures after rolling affects the precipitation of ferrite and carbide, and that the reduction within ferrite and precipitation of carbide within non-magnetic steel can effectively reduce the magnetic flux. This change stems from the fact that the tempering temperature is higher than the low temperature transformation temperature of ferrite and austenite, and the high temperature tempering of the coil can effectively improve the amount and distribution of ferrite and carbides. The reduction of ferrite enhances the toughness of the steel and the increase of carbide improves the strength of the steel. Therefore, proper adjustment of the tempering temperature of steel coil can effectively improve the mechanical properties of non-magnetic steel.