Abstract
In previous studies the authors have shown that a Fe-17% Mn alloy possesses the highest damping capacity in the Fe-Mn system. It was suggested that the damping is related to the amount of {epsilon} martensite. Thus the objective of this study has been to investigate the effect of {epsilon} content on the damping capacity of Fe-17% Mn alloy. To increase the amount of {epsilon} martensite, two different heat treatments were applied: One was cooling to various temperatures between room temperature and {minus}196 C, and the other was cyclic transformation, {gamma}{leftrightarrow}{epsilon}, between room temperature and 255 C above A{sub f}. The two heat treatments led to the different dependences of damping capacity on {epsilon} martensite content. The first heat treatment showed that the damping capacity is gradually increased with increasing {epsilon} martensite volume fraction, while the second heat treatment showed that the damping capacity is steeply decreased with increasing {epsilon} martensite content. In the present paper, the reason has been elucidated clearly.
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