|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Low-density, Medium-Mn Steels: Influence of Al Content on Microstructure Related Properties
||Tomas Scuseria, Kelcey Garza, Dean Pierce, Jerry Arnold, Amy Clarke, Kester Clarke
|On-Site Speaker (Planned)
As the steel and automotive industries accelerate sustainability efforts, novel alloy design is needed to meet targets. Low-density steels have been proposed for increased energy savings and performance for AHSS. Al additions (4-11 wt%) to medium-Mn steels provide mass savings through density reductions, while promoting duplex, ferrite-austenite microstructures with excellent strength-elongation combinations. Concurrently, Al additions stabilize delta ferrite at hot-rolling temperatures, causing local chemical gradients and banded microstructures, in addition to altering austenite stability and deformation behavior. The influence of Al content and thermomechanical processing must be deconvoluted to establish robust alloy design strategies. Fe-Mn-Al-C alloys were produced into sheets and characterized in the cold-rolled and intercritically annealed condition for temperatures up to 900 °C and annealing times up to 6 h. Increasing Al additions were detrimental to tensile properties at fixed Mn and C, while increasing the Mn and C content at fixed Al improved specific strength.
||Iron and Steel, Characterization, Mechanical Properties