|About this Abstract
|2020 TMS Annual Meeting & Exhibition
|Advanced High Strength Steels IV
|Effect of Si on Microstructure and Mechanical Properties of FeMnAlC Lightweight Steels
|Zhangwei Wang, Wenjun Lu, Junyang He, Dirk Ponge, Dierk Raabe, Zhiming Li
|On-Site Speaker (Planned)
We systematically investigated the influence of Si on the microstructural evolution and mechanical properties of Fe-30Mn-9Al-1.2C-xSi (x=0-2 wt. %) lightweight steels under the as-homogenized state. With the increase of Si content from 0 to 2 wt. %, the average sizes of κ-carbides in the austenite matrix increase from ~1 nm to ~12 nm. In addition, particle-shaped κ_0-carbide and α-ferrite are formed at grain boundaries in the steel with 2 wt. % Si. The growth of κ-carbide in grain interior further causes a strong precipitate strengthening effect, leading to the increase of yield strength from ~450 MPa to ~900 MPa. The primary deformation mechanism is the formation of slip bands in all the three steels, which involves the shear of κ-carbides upon straining. The present study provides valuable insights into the design of lightweight steels via the addition of lightweight elements.
|Planned: Supplemental Proceedings volume