Precipitation strengthening in high manganese austenitic TWIP steels
-
Colin Scott
, Blandine Remy , Jean-Louis Collet , Aurelie Cael , Cuimin Bao , Frederic Danoix , Benoît Malard and Caroline Curfs
Abstract
At low strains (∊ < 0.25), the precipitation of Ti, Nb, V carbides in austenitic Fe–Mn–C steels which exhibit twinning induced plasticity has no significant effect on work hardening. Strengthening follows the Orowan mechanism and can be described by a simple yield stress offset. However, at higher strains (∊ > 0.3) the work hardening rate decreased slightly. Synchrotron X-ray diffraction analysis suggested that this was due to a reduction in the kinetics of twin formation. The highest strengthening coefficient in cold strips was obtained with Ti additions ≤0.1 wt.% (+1 380 MPa/wt.% Ti) but the effect quickly saturated after an increase of ∼+150 MPa. With Nb additions only modest hardening (+187 MPa/wt.%) could be achieved. The strengthening due to V was >530 MPa/wt.% for V additions ≤ 0.4 wt.% Saturation effects are less critical with V additions and yield stress increases of +375 MPa were demonstrated.
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- Original Contributions
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- Neuro-finite element application in material characterization using small punch test
- Multi-phase biocomposite material in-situ fabricated by using hydroxyapatite and amorphous nanosilica
- Particularities of the formations of bainite and martensite/austenite phase in low carbon low alloy steels during continuous cooling
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- Influence of nitridation time on microstructure, morphology and optical properties of GaN nanowires by nitridizing Ga2O3/Cr thin films
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- Precipitation strengthening in high manganese austenitic TWIP steels
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- Enhancement in optical transmission of ZnO: Al film by c-orientation arrayed growth
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