Synchronous optimization of strengths, ductility and corrosion resistances of bulk nanocrystalline 304 stainless steel

Autor: Yuxiang Xu, S.G. Wang, Z. D. Zhang, K. Long, C.B. Gong, Xingfen Liu, Mingtai Sun, Suyun Liu
Rok vydání: 2020
Předmět:
Zdroj: Journal of Materials Science & Technology. 37:161-172
ISSN: 1005-0302
DOI: 10.1016/j.jmst.2019.05.073
Popis: Structural 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 BN-304SS can be simultaneously optimized by severe rolling technology. These improved results of BN-304SS in different disciplines were understood by its valence electron configurations rather than traditional microstructural parameters.
Databáze: OpenAIRE
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