Martensitic transformation, phase constitution, microstructure and damping properities of rapidly solidified binary Fe-17%Mn alloy

6^th International Conference and Exhibition on Materials Science and Engineering

September 12-14, 2016 Atlanta, USA

N Yan and B Wei

Northwestern Polytechnical University, China

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Discovery of shape memory effect in Feâ��Mn based alloys undergoing non-thermoelastic �³â���µ martensitic transformation raise a possibility that the alloys can absorb mechanical energy by internal friction. It posses the combination of a pronounced damping capacity and good mechanical properties and have been the subject of many investigations as part of a particular interest in high damping alloys for engineering applications. Thus, the high damping Fe-17%Mn alloy can be widely applied to household appliances, automobiles, industrial facilities and power plant components with its excellent damping capacity (specific damping capacity of 30%) and mechanical property (an ultimate tensile strength of 700 MPa). The Fe-Mn based alloys are successfully used in stone cutting machines, where the reduction in noise achieved in 10-25 dB. The damping capacity in Fe-Mn based alloys is generally attributed to �µ martensite and stacking faults together. In the present work, the aim is to investigate the martensitic transformation, phase constitution, microstructure and damping properities of Fe-17%Mn alloy prepared by thin strip casting and free fall processing. The variation of strip thickness is found to have a large effect on the phase constitution, microstructure and damping property of the alloy. Heat treatment of the thin strips enhances the damping property with temperature and strain, remarkably. The influence of difference in cooling rate and undercooling of rapid solidified droplets on the martensitic transformation and microstructure is also demonstrated. Both the martensitic transformation temperature Ms and inverse martensitic transformation temperature increases with the decrease in droplet diameter. The microstructure is composed of much refined (Fe) dendrites.

Biography :

Email: yanna@nwpu.edu.cn