Synchronous optimization of strength, ductility and corrosion resistance of bulk nanocrystalline 304 stainless steel

Publication date: Available online 10 September 2019Source: Journal of Materials Science & TechnologyAuthor(s): S.G. Wang, M. Sun, S.Y Liu, X. Liu, Y.H. Xu, C.B. Gong, K. Long, Z.D. ZhangAbstractStructural materials usually suffer from several attacks during their service, such as tension, fatigue and corrosion. It is necessary to synchronously improve these properties for their lightweight and long-lifetime, but corrosion resistance and ductility are generally inverse correlation with strength, it is very difficult to simultaneously optimize all three properties. However, bulk nanocrystalline 304 stainless steel (BN-304SS) produced by severe rolling technology possessed the larger yield and ultimate tensile strengths with sufficient elongation (> 40%) during tensile test, the larger saturation stress and longer lifetime during low-cycle fatigue, the enhanced uniform and pitting corrosion resistances during five-day immersion test in 6 mol/L HCl, the lowered stress corrosion cracking (SCC) susceptibility with larger yield (˜2.40 GPa) and ultimate tensile (˜2.66 GPa) strengths, and enough elongation (> 30%) during stress corrosion in comparison with conventional polycrystalline 304 stainless steel (CP-304SS) counterpart. The uniform and pitting corrosion resistances of fractured BN-304SS were enhanced in comprsion with those of fractured CP-304SS during seven-day immersion test in 1 mol/L HCl. These results demonstrated the strengths, ductility and corrosion resistances of B...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research