Simultaneously improving the strength and ductility of Fe–22Mn–0.6C twinning-induced plasticity steel via nitrogen addition

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

13 Scopus Citations
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Author(s)

  • H.K. Yang
  • Y.Z. Tian
  • Z.J. Zhang
  • Z.F. Zhang

Detail(s)

Original languageEnglish
Pages (from-to)276-280
Journal / PublicationMaterials Science and Engineering A
Volume715
Online published6 Jan 2018
Publication statusPublished - 7 Feb 2018

Abstract

The effect of nitrogen addition on the mechanical properties of Fe–22Mn–0.6C (wt%) twinning-induced plasticity steel was studied. It was found that the stacking fault energies of the two steels were comparable, and the twinned grain fractions of FeMnC and FeMnC-N steels were similar before the true strain of 0.5. With increasing the strain to 0.7, the fraction of secondary twinned grain rose to support the further strong work-hardening rate of FeMnC-N steel. Moreover, the nitrogen addition suppressed the dynamic strain aging, which can trigger early shear fracture in FeMnC steel. Therefore, the work-hardening rate was kept increasing and the frequency of plastic instability was suppressed by nitrogen addition. As a result, the ultimate tensile strength and uniform elongation simultaneously increased in FeMnC-N steel.

Research Area(s)

  • Deformation twin, Dynamic strain aging, Nitrogen, Stacking fault energy, Twinning-induced plasticity (TWIP) steel

Citation Format(s)