Effects of strain and strain-induced α′-martensite on passive films in AISI 304 austenitic stainless steel

Jinlong Lv, Hongyun Luo

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

In this paper, the effects of strain and heat treatment on strain-induced α′-martensite of AISI 304 stainless steel tubes were measured by X-ray diffraction. Moreover, the effects of strain and content of α′-martensite on passivated property on the surface of the material in borate buffer solution were evaluated by electrochemical technique. The results showed that the volume fraction of α′-martensite increased gradually with the increase of tensile strain for as-received and solid solution samples. However, α′-martensite in as-received sample was more than that in the solid solution sample. The electrochemical impedance spectroscopy results showed that the solid solution treatment improved corrosion resistance of the steel, especially for samples with small strain. Moreover, acceptor densities were always higher than donor densities for as-received and solid solution samples. With the increase of strain, the increase tendency of acceptor density was more significant than that of donor density. We also found that the total density of the acceptor and donor almost increased linearly with the increase of α′-martensite. The present results indicated that the increased acceptor density might lead to the decreased corrosion resistance of the steel.

Original languageEnglish
Pages (from-to)484-490
Number of pages7
JournalMaterials Science and Engineering C
Volume34
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • AISI 304 austenitic stainless steel
  • Electrochemical impedance spectroscopy
  • Martensite transformation
  • Passive film
  • Tensile strain

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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