4.7 Article

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

Journal

Publisher

ELSEVIER
DOI: 10.1016/j.jmrt.2020.12.005

Keywords

316L stainless steel; Heterostructure; EBSD; Pitting resistance; Potentiodynamic polarization

Funding

  1. National Natural Science Foundation of China [51741106, 52071180]
  2. Natural Science Foundation of Jiangsu Province [BK20191292]
  3. Natural Science Foundation of Anhui Province [2008085J23]
  4. China Postdoctoral Science Foundation [2020TQ0300]
  5. Natural Science Foundation of Anhui Provincial Education Department [KJ2020A0342]
  6. Foundation of Key Laboratory of National Defense Science and Technology [6142005180208]
  7. Scientific Research Starting Foundation of Anhui Polytechnic University of China [2020YQQ009, 2020YQQ026, 2020YQQ027]

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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.
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.

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