Papers › The relative contributions of TWIP and TRIP to strength in fine grained medium-Mn steels
The relative contributions of TWIP and TRIP to strength in fine grained medium-Mn steels
T W J Kwok, P Gong, R Rose, D Dye
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A medium Mn steel of composition Fe-4.8Mn-2.8Al-1.5Si-0.51C (wt.%) was processed to obtain two different microstructures representing two different approaches in the hot rolling mill, resulting in equiaxed vs. a mixed equiaxed and lamellar microstructures. Both were found to exhibit a simultaneous TWIP+TRIP plasticity enhancing mechanism where deformation twins and α′-martensite formed independently of twinning with strain. Interrupted tensile tests were conducted in order to investigate the differences in deformation structures between the two microstructures. A constitutive model was used to find that, surprisingly, twinning contributed relatively little to the strength of the alloy, chiefly due to the fine initial slip lengths that then gave rise to relatively little opportunity for work hardening by grain subdivision. Nevertheless, with lower high-cost alloying additions than equivalent Dual Phase steels (2-3 wt% Mn) and greater ductility, medium-Mn TWIP+TRIP steels still represent an attractive area for future development.
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