A microstructural investigation on deformation mechanisms of Fe-18Cr-12Mn-0.05C metastable austenitic steels containing different amounts of nitrogen

A. Kermanpur, P. Behjati, J. Han, A. Najafizadeh, Y. K. Lee

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Deformation mechanisms of the Ni-free Fe-18Cr-12Mn-0.05C (wt%) austenitic steels containing 0, 0.25 and 0.44. N were investigated. Effects of N addition, strain and temperature on the formation of deformation-induced ε- and α'-martensite phases were determined using transmission electron microscopy and electron back-scattered diffraction techniques. Based on the microstructural evolutions, it is proposed that deformation mechanism of these steels includes the sequence of γ. →. ε-martensite. →. α'-martensite, in which the formation and stability of the ε-martensite is significantly enhanced by the N content. Increased deformation temperature from 298 to 373. K reduces the formation of ε-martensite (more than 80%).

Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalMaterials and Design
Publication statusPublished - 2015 Oct 5


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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