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The influence of temperature on the strain-hardening behavior of Fe-22/25/28Mn-3Al-3Si TRIP/TWIP steels

Journal Article · · Materialia
 [1];  [2];  [3];  [4];  [5];  [1];  [5];  [6]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  3. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Centro Nacional de Investigaciones Metalúrgicas
  4. Max-Planck-Institut für Eisenforschung, Düsseldorf (Germany); BAM Federal Institute for Materials Research and Testing, Berlin (Germany)
  5. Max-Planck-Institut für Eisenforschung, Düsseldorf (Germany)
  6. Vanderbilt Univ., Nashville, TN (United States)

In this work, the influence of temperature and stacking fault energy (SFE) on the strain-hardening behavior and critical resolved shear stress for twinning was investigated for three Fe–22/25/28Mn–3Al–3Si wt.% transformation- and twinning-induced plasticity (TRIP/TWIP) steels. The SFEs were calculated by two different methods, density functional theory and statistical thermodynamic modeling. The dislocation structure, observed at low levels of plastic deformation, transitions from “planar” to “wavy” dislocation glide with an increase in temperature, Mn content, and/or SFE. The change in dislocation glide mechanisms from planar to wavy reduces the strain hardening rate, in part due to fewer planar obstacles and greater cross slip activity. Additionally, the alloys exhibit a large decrease in strength and ductility with increasing temperature from 25 to 200 °C, attributed to a substantial reduction in the thermally activated component of the flow stress, predominate suppression of TRIP and TWIP, and a significant increase in the critical resolved shear stress for mechanical twinning. Interestingly, the increase in SFE with temperature had a rather minor influence on the critical resolved shear stress for mechanical twinning, and other temperature dependent factors which likely play a more dominant role are discussed.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); Ministry of Science and Innovation of Spain
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1866707
Journal Information:
Materialia, Journal Name: Materialia Journal Issue: 1 Vol. 22; ISSN 2589-1529
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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