Abstract：The effect of Mn contents on microstructure and properties of Fe-Mn alloy was studied. The damping property of the test material was done by dynamic thermal mechanical analyzer, and the phase composition of the material was semi-quantitatively determined by X-ray Diffraction and electron backscatter diffraction scanning electron microscope. The results show that the damping property of Fe-Mn alloy increases linearly with the increase of strain amplitude, and the damping properties of Fe-Mn alloy increase with the increase of Mn content. And the strength of Fe-Mn alloy increases with the increase of Mn content, while the toughness decreases. The analysis shows that the increase of Mn content can increase the content of ?-martensite and refine the lath of ?-martensite, increase the interface of damping source and improve the damping property of the alloy.
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