| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Steels for Sustainable Development
|
| Presentation Title |
Low-density, Medium-Mn Steels for Lightweighting: Influence of Al content on Microstructure and Tensile Properties |
| Author(s) |
Tomas Scuseria, Kelcey Garza, Dean Pierce, Jerry Arnold, Amy Clarke, Kester Clarke |
| On-Site Speaker (Planned) |
Tomas Scuseria |
| Abstract Scope |
Low-density steels are a candidate for increased energy savings and performance for Advanced High Strength Steel (AHSS). Al additions (5-7 wt%) to medium-Mn steels provide lightweighting through density reductions, while promoting duplex microstructures with excellent tensile properties. Concurrently, Al stabilizes ferrite at high temperatures, creating local chemical gradients and banded microstructures that are sensitive to processing, in addition to altering the austenite stability and work-hardening characteristics, such as TRIP, TWIP, or planar slip. This influence of Al 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. Increasing Al additions were found to be detrimental to tensile properties at fixed Mn and C content, while increasing the Mn and C content to suppress high ferrite fractions improved specific strength. Additionally, cryogenic treatment and tempering was used to study martensite-containing microstructures for increased strength. |