|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||On the Development of High-strength High-damping Steels: A CALPHAD Assisted Alloy Design Study
||Julian Rackwitz, Cemal Cem Tasan, Gregory Bruce Olson
|On-Site Speaker (Planned)
Self-damping materials provide various benefits for consumer comfort and component lifetimes including noise reduction, dynamic stability, and fatigue. Lately, the Fe-Mn alloy system has gained more attention as a low-cost nonmagnetic alternative to high-damping Ti-Ni and Mn-Cu alloys. Currently, there exists a trade-off between damping capacity and strength in these alloys prohibiting their use in load-bearing applications. To overcome this limitation, we propose the need of short-range motion of partial dislocations to be sustained while impeding the long-range movement of lattice dislocations. Therefore, we present experiments to quantify the interactions between the primary damping source in Fe-Mn alloys and other microstructural features. Two prototype candidates of high-strength high-damping steels are designed based on CALPHAD modeling, prototyped, and experimentally evaluated. A driving-force-based damping model and a precipitation strengthening model are developed to derive alloy design guidelines to inform the subsequent design approach. Preliminary experimental results demonstrate the validity of this approach.
||Iron and Steel, Computational Materials Science & Engineering, Other