Deformation behavior of ferrite–austenite duplex lightweight Fe–Mn–Al–C steel

Analysis of banded microstructures in multiphase steels assisted by transformation-induced plasticity

“…Indeed, the amount of plastic deformation in the ferritic matrix is higher for banded microstructures than for dispersed ones, which in relative terms diminishes the contribution to the overall strength of the (harder) secondary phase in banded microstructures. This prediction of the simulations is consistent with experimental observations reported in [29], albeit for tensile tests. In the experiments a significant portion of the deformation was carried by the ferritic matrix while the austenite in the banded regions experienced a smaller deformation and, consequently, a relatively small transformation rate.…”

“…The benchmark distribution is typically encountered in cold-rolled TRIP steels that are subsequently subjected to a two-step annealing (intercritical annealing followed by isothermal heat treatment), where retained austenite appears in grains wedged between ferritic grains. Conversely, austenitic grains clustered in a band-like region may appear during hot-rolling (i.e., high-temperature mechanical deformation during processing), whenever the banded morphology is not completely removed during further heat treatment, see [29]. The relevance of banded morphologies on the mechanical response of ferrous alloys has been discussed in [30][31][32].…”

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

“…In the present study, we performed laser welding on sheets of a ferrite-based lightweight steel containing high concentrations of Mn, Al, and C. Further, the steel consisted of dual phases with different mechanical properties and underwent work hardening during deformation [9,32]. Therefore, there could be three reasons for the fracturing that occurred in the HAZ.…”

“…As a result, highly deformable high-strength steels such as transformation-induced-plasticity (TRIP) steels and twinning-induced-plasticity (TWIP) steels have been developed [1][2][3][4][5][6][7][8]. Recently, a ferrite-based lightweight steel, namely, Fe-Al-Mn-C steel, which exhibits transformation-induced hardening during deformation, was announced [9][10][11][12].…”

“…They reported that preferential straining occurred in the coarse ferrite matrix during tensile deformation. Seo et al [9] investigated the deformation behavior of a Fe-3.5 wt % Mn-5.9 wt % Al-0.4 wt % C alloy and found that most of the deformation was accommodated by the ferrite phase, while the clustered austenite particles underwent a strain-induced martensitic transformation. This also resulted in the buildup of strain along the ferrite/austenite interphase boundaries.…”