Interaction Between Recovery, Recrystallization, and NbC Strain-Induced Precipitation in High-Mn Steels
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FACED with the challenge of reduced CO2 emissions, steel manufacturers are involved in developing new products for automotive industry with lower densities and/or higher mechanical properties. In this context, high-Mn steels characterized by TWinningInduced Plasticity (TWIP) are highlighted because of their excellent strength and ductility combination. These steels are characterized by a high-Mn content, in the 15 to 30 pct range, and excellent strain hardening properties,[1–4] which is attributed mainly to the formation of twins during straining. As grain boundaries, twin boundaries act as strong obstacles to dislocation motion, leading to a dynamic hardening effect and very high ductility values. Due to this effect, high-Mn steels are potentially attractive for automotive applications involving press-formed parts for energy absorption, or for structural reinforcement which assures vehicle structural stability in case of car crash. However, crash resistance is related to Yield Strength (YS) and even fine-grained (1.5 deg), characteristic of a deformed microstructure. As the holding time increases, the distributions become narrower, with a significant increase in the number of grains with low GOS values (
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