Behavior of 316L stainless steel containing corrosion pits under cyclic loading

Muntasir Hashim, Farnoosh Farhad, David Smith-Boyle, Robert Akid, Xiang Zhang, Philip J Withers

Research output: Contribution to journalArticle

Abstract

The environmental performance of 316L grade stainless steel, in the form of tensile specimens containing a single corrosion pit with various aspect ratios, under cyclic loading in aerated chloride solutions is investigated in this study. Results from environmental tests were compared and contrasted with those obtained using finite element analysis (FEA). Fractography of the failed specimens obtained from experiments revealed that fatigue crack initiation took place at the base of the shallow pit. The crack initiation shifted towards the shoulder and the mouth of the pit for pits of increasing depth. This process is well predicted by FEA, as the strain contour maps show that strain is the highest around the centric strip of the pit. However, for shallow pits, local strain is uniformly distributed around that strip but begins to concentrate more towards the shoulder and the mouth region for increasingly deep pits.

Original languageEnglish
Pages (from-to)2009-2019
Number of pages11
JournalMaterials and Corrosion
Volume70
Issue number11
Early online date21 Jun 2019
DOIs
Publication statusPublished - 1 Nov 2019

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Keywords

  • 316L stainless steel
  • Stress Corrosion Cracking (SCC)
  • corrosion pits
  • fatigue
  • pit-to-crack transition

ASJC Scopus subject areas

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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