|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels V
||Low-density Steels: Processing Pathways and Alloying Strategies in Medium Mn, Al-added Steels
||Tomas Scuseria, Kelcey Garza, Dean Pierce, Amrinder Gill, Jerry Arnold, Amy Clarke, Kester Clarke
|On-Site Speaker (Planned)
Low-density steels are a promising path to increased energy savings and performance in Advanced High Strength Steels (AHSS) for the automotive industry. Al additions (3-12 wt %) to medium Mn steels provide direct mass savings through density reductions near 10%, while promoting duplex, ferrite-austenite microstructures with high specific strength and elongation. Concurrently, the presence of coarse δ-ferrite or deleterious intermetallics may hinder ductility and formability. Additional alloying strategies, such as the introduction of B2 precipitates (Ni, Cu) or other microalloying (V, Nb, B) in low-density steels, have shown promise in tailoring the desired work hardening characteristics. Experimental Fe-Mn-Al-C based grades were produced into sheets and characterized in the hot-rolled and heat treated conditions. Effects of alloying content and prior processing on phase fractions, grain refinement, morphology, and local composition were investigated to give optimal balance of deformation mechanisms, such as Transformation Induced Plasticity (TRIP) and Twinning Induced Plasticity (TWIP).