Enhanced pitting resistance through designing a high-strength 316L stainless steel with heterostructure

A high-strength 316L stainless steel with heterostructure (HS) was used to explore its corrosion properties in 3.5wt.% NaCl solution at 25 degrees C. Compared with a conventional coarse-grained (CG) sample, the HS sample with the characteristic of that the recrystallized grains (RGs) were surrounded by ultrafine/nano-structures (UFS/NSs) exhibited an enhanced pitting resistance. This was ascribed to interrupted propagation of the stable corrosion pits in RGs by the surrounded UFS/NSs. The results in current work may provide a new strategy to improve corrosion properties by heterostructural designing. (C) 2020 The Author(s). Published by Elsevier B.V.

Automated summary

By utilizing a high-strength 316L stainless steel with heterostructure, the corrosion properties in a 3.5wt.% NaCl solution were explored, showing an enhanced pitting resistance compared to conventional samples. This improvement was attributed to the interruption of stable corrosion pits propagation by the ultrafine/nano-structures surrounding the recrystallized grains. This study may offer a new approach to enhancing corrosion properties through heterostructural designing.