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

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• 作者：Sunmi Shin^a ; ^b ; ^{smshin@kitech.re.kr} ; Minhyuk Kwon^a ; Wontae Cho^c ; In Shik Suh^c ; B.C. De Cooman^a
• 关键词：Fe-Mn alloy ; Epsilon martensite ; Damping ; Internal friction ; Thermal cycling
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：23 January 2017
• 年：2017
• 卷：683
• 期：Complete
• 页码：187-194
• 全文大小：1411 K
• 卷排序：683

文摘

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/γ phase boundaries. Dilatometry of the ultra-fine grained Fe-17 wt%Mn steel revealed that the ε↔γ phase transformation was largely suppressed. The features of the damping spectra were related to the anti-ferromagnetic transition in the γ phase, the thermo-elastic ε↔γ 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.