Journal
MATERIALIA
Volume 22, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2022.101425
Keywords
TWIP steel; TRIP steel; Stacking fault energy; Plasticity mechanisms; Twinning
Categories
Funding
- National Science Foundation Di-vision of Materials Research, USA [DMR0805295, DMR1309258]
- Ministry of Science and Innovation of Spain [MAT2012-39124]
- Center for Nanophase Materials Science [CNMS2014-291]
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The influence of temperature and stacking fault energy on the strain-hardening behavior and critical resolved shear stress for twinning in TRIP/TWIP steels was investigated. The study found that an increase in temperature, Mn content, and/or stacking fault energy led to a change in the dislocation glide mechanisms and a decrease in strain hardening rate. Additionally, the alloys exhibited a significant decrease in strength and ductility with increasing temperature.
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. In addition, the alloys exhibit a large decrease in strength and ductility with increasing temperature from 25 to 200 degrees 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.
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