|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Very Strong High-entropy Steel Strengthened by Multiphase of Multiscale
||Yi-Hsuan Sun, Zen-Hao Lai, Jui-Fan Tu, Yu-Jen Tseng, Hung-Wei Yen
|On-Site Speaker (Planned)
High-entropy steel is Fe-based alloy designed with entropy-driven compositional complexity. In this work, a novel high-entropy lightweight steel has been developed by managing microstructural complexity under compositional complexity. In this steel, a microstructure composed of austenite and D03 intermetallic compounds is obtained by duplex annealing after cold rolling. Besides, a further aging induces precipitation of nanometer-sized κ-carbides in austenite, which bring about strength increase by 700 MPa. Interestingly, the total elongation of the steel is about 15%, which is attributed to twinning-induced plasticity. Influence of κ-carbides on stacking fault energy and deformation twin was discussed in this work. Moreover, interaction between deformation twin and κ-carbide is further investigated by TEM. The present research provides an idea in alloy and microstructural design of high-entropy lightweight steel with 1.5 GPa-level yield strength, 1.7 GPa-level ultimate tensile strength and good ductility.
||Iron and Steel, High-Entropy Alloys, Mechanical Properties