FEMS EUROMAT 2023
Highlight Lecture
07.09.2023
Towards High-Strength High-Damping Steels: A CALPHAD Assisted Alloy Design Study
JR

Julian Rackwitz (M.Sc.)

Massachusetts Institute of Technology (MIT)

Rackwitz, J. (Speaker)¹; Tasan, C.¹; Olson, G.¹
¹Massachusetts Institute of Technology, Cambridge (United States)
Vorschau
21 Min. Untertitel (CC)

Improving self-damping capabilities provides various benefits for metallic materials, including increased dynamic stability and fatigue life, as well as reduced noise. Lately, the Fe-Mn alloy system has gained more attention as a low-cost, nonmagnetic alternative to high-damping cast irons, Ti-Ni, and Mn-Cu alloys. Currently, the trade-off between damping capacity and strength in these alloys limits their use in load-bearing applications. We propose that this trade-off can be overcome by suppressing the long-range movement of lattice dislocations while allowing the short-range motion of partial dislocations. To this end, by considering different strengthening approaches and developing a driving-force-based damping model, we designed two prototype candidates of high-strength high-damping steels using CALPHAD modeling. We present here preliminary experiments that demonstrate the validity of this approach by quantifying the influence of damping mechanisms in Fe-Mn alloys.

Abstract

Abstract

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