Abstract
The temperature-dependent microstructure evolution and corresponding mechanical stability of retained austenite in medium-Mn transformation induced plasticity (TRIP) 0.17C-3.1Mn-1.6Al type steel obtained by thermomechanical processing was investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD) techniques. Specimens were deformed up to rupture in static tensile tests in the temperature range 20–200 °C. It was found that an increase in deformation temperature resulted in the reduced intensity of TRIP effect due to the higher stability of retained austenite. The kinetics of strain-induced martensitic transformation was affected by the carbon content of retained austenite (RA), its morphology, and localization in the microstructure.
Highlights
A new concept of lean medium-Mn transformation induced plasticity (TRIP) steels containing3–5 wt.% manganese is being intensively developed due to growing quality requirements and cost effectiveness of the automotive industry
The microstructural analysis was static tensile tests performed at the temperature range
20–200 austenite in TRIP-assisted 0.17C-3.1Mn-1.6Al-0.22Si-0.22Mo-0.04Nb steel deformed up to rupture in static tensile tests performed at the temperature range 20–200 °C
Summary
A new concept of lean medium-Mn transformation induced plasticity (TRIP) steels containing. Fe-0.12C-10Mn-2Al-0.05Si steel investigated by Zhang et al [18] showed an optimal TRIP effect in the temperature range 25–50 ◦ C, while increasing the deformation temperature to 100 ◦ C resulted in noticeable deterioration of yield stress (YS), ultimate tensile strength (UTS), and total elongation (TE) values. The present study concerned the microstructure evolution and mechanical stability of retained austenite in a medium-Mn TRIP steel at various deformation temperatures. It required a proper identification of retained austenite, which was quite difficult due to its relatively small size, varying morphology, and its distribution in the matrix. It can provide the amount of retained austenite and distribution and morphology of the γ phase
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