Martensite reversion and texture formation in 17Mn-0.06C TRIP/TWIP steel after hot cold rolling and annealing

Abstract

Electron backscattering diffraction (EBSD)Cold rolling Recrystallization TRIP/TWIP steel a b s t r a c t High Mn steels with Si and Al present great plasticity when deformed due to the TRIP/TWIP effect. This work evaluated the microstructural evolution and texture formation of a 17Mn-0.06C steel after hot rolling, cold rolling to 45% of thickness reduction and annealing at 700 • C for different times. The microstructural analysis was performed by means of dilatometry, X-ray diffraction (XRD), optical (OM) and scanning electron microscopy (SEM), electron backscattering diffraction EBSD and transmission electron microscopy (TEM). It was found that during the cooling process, after the steel is annealed, the athermal and ␣ martensites are formed. Tensile test results showed that the steel exhibits yield and tensile strength around 650 and 950 MPa with a total elongation around 45%. The austenite texture contains brass, copper and Goss components while the ␣ and martensites textures contain rotated cube and prismatic and pyramidal fibers, respectively.

Analysis of Texture and Microstructure of Annealed Fe-23Mn-3Si-3Al Steel

“…Even though a typical component occurring in the texture of recrystallized austenite is a cubic orientation {100} 001 , regardless of that, in the case of this steel, that orientation is absent. Similar results were reported in the paper of Escobar and collaborators [8].…”

“…Data in the literature indicate that in this temperature range there occurs the following transformation: ε → γ [8]. In the structure, apart from austenite, the martensite (ε and α ) are present, which is observable by selective diffraction.…”

“…This is evidence that a reverse transformation α → γ has occurred. Data in the literature [8] state that reverse transformation ε → γ occurs at temperatures of 100…”

Microstructure and Mechanical Properties of Gas Tungsten Arc Welded High Manganese Steel Sheet

“…The columnar dendrites are known to grow parallel to the maximum heat flow direction and were observed to be aligned towards the welding heat source (Figure 2e). In order to observe the cross-sectional microstructures of the base, the HAZ and the weld zone, specimens were polished and color-etched for 30 s in a 10% nital (10% NHO 3 + ethanol) and for 10 s in Klemm's I (50 mL saturated aqueous Na 2 S 2 O 3 + 1 g K 2 S 2 O 5 ) [24,25].…”

Martensite to austenite reversion in a high-Mn steel: Partitioning-dependent two-stage kinetics revealed by atom probe tomography, in-situ magnetic measurements and simulation

“…Advanced Mn-based steel variants have also been designed by means of precipitation reactions, grain refinement [5], and grain boundary segregation engineering [19]. The absence of pronounced anisotropy in both mechanical properties and crystallographic textures are among the advantages of strengthening by grain refinement [20]. This can be achieved by austenite reversion ('→) treatments, as reported for austenitic high-Mn TRIP steels [20,21].…”