Mechanical and Corrosion Properties of Low‑Carbon Steel Processed by Cryorolling: Effect of Different Initial Microstructures

摘要

In this study, low-carbon steel was fabricated by 70% rolling with ferrite–pearlite and ferrite–martensite as starting microstructuresat liquid nitrogen temperature. The samples were characterized for microstructure, crystallite size, strength, andcorrosion behaviour by using optical microscopy, X-ray diffraction, tensile test, potentiodynamic polarization, immersiontest and electrochemical impedance spectroscopy. The ferrite–martensite starting microstructure has the highest grain aspectratio (12.86), highest ultimate tensile strength (927.36 MPa), highest yield strength (920.05 MPa), smallest crystallite size(4.80 nm) and elongation (8.08%) than cryorolled sample with ferrite