Research on Microstructures and Properties of High-Strength Anticorrosion Twinning-Induced Plasticity Steels

The microstructures, mechanical properties, and anticorrosion properties of Fe–25Mn–Cr(12, 18 wt.%)–CN TWIP steels compared with nominal Fe–22Mn–0.6C steel (TWIP-ref) in the solid-solution state were investigated present study by using X-ray diffraction (XRD), electron backscattered (EBSD), transmission microscopy (TEM), tensile tests, potentiodynamic polarization measurement, etc. results show that Fe–Mn–Cr–CN have excellent to TWIP-ref steel. strain-hardening rate 12CrN is lower than because relatively late generation high-density deformation twins, which resulted less strength increments during test. Moreover, M23C6 precipitates enriched Mn Fe formed as Cr content increased, had an important influence on properties. In steels, precipitation 18CrN sample, yield (σYS) increased slightly, while ultimate (σUTS) elongation failure are decreased. addition, has poor corrosion resistance formation (i.e., it negative potential (Ecorr) a smaller current density (Icorr)).