The effect of grain size on the damping capacity of Fe-17 wt%Mn

The grain size dependence of the damping capacity of Fe-17 wt%Mn steel was investigated. A high damping capacity was measured in the ultra-fine grained steel, despite its lower volume fraction of ε martensite and lower density of ε variant boundaries and ε/y phase boundaries. Dilatometry of the ultr...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-01, Vol.683, p.187-194
Hauptverfasser: Shin, Sunmi, Kwon, Minhyuk, Cho, Wontae, Suh, In Shik, De Cooman, B.C.
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Sprache:eng
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Zusammenfassung:The grain size dependence of the damping capacity of Fe-17 wt%Mn steel was investigated. A high damping capacity was measured in the ultra-fine grained steel, despite its lower volume fraction of ε martensite and lower density of ε variant boundaries and ε/y phase boundaries. Dilatometry of the ultra-fine grained Fe-17 wt%Mn steel revealed that the ε⇔y phase transformation was largely suppressed. The features of the damping spectra were related to the anti-ferromagnetic transition in the y phase, the thermo-elastic ε⇔y phase transformation and the motion of grain boundaries in the ultra-fine grained microstructure. The damping spectrum of the ultra-fine grained Fe-17 wt%Mn steel was dominated by grain boundary damping effects.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.10.079