Research On The Damping Performance Of Fe-Mn Based Vibration Damping Alloy

In order to improve the damping and mechanical properties of Fe-Mn alloy,Fe-Mn damping alloy was made through the medium-frequency induction furnace melting.The Mn content(Fe-11 Mn,Fe-15 Mn,Fe-18Mn)of different components and the addition of C,Al,NB elements(Fe-16Mn-0.6C,Fe-16Mn-0.6C-1.5Al,Fe-16Mn-0.6C-1.5Al-0.005Nb)were designed.The multi-function internal friction instrument,X-ray diffraction technology(XRD),scanning electron microscope(SEM),optical microscope,GXL-42-Q high temperature box atmosphere furnace,HBRV-187.5 electric broom hardness tester,MTSLandmark material testing system are used to further discuss its damping behavior and production mechanism,which will make preliminary research for further engineering application study and lay a theoretical foundation for the later research.The effect of Mn content on the form and quantity of martensite in Fe-xMn alloy was studied.Moreover,with the increase of Mn content,martensite content increases gradually,The internal friction value of the alloy increases with the growth of strain amplitude.At the same time,the relation between stress and strain in Fe-xMn alloy with different Mn content was also studied.It is concluded that the stress of Fe-18 Mn increases the fastest with the increase of strain.Secondly,the stress of Fe-15 Mn increases relatively fast with the increase of strain,while the stress of Fe-11 Mn increases slowly with less plastic in the narrow strain range.The fracture morphology of the alloy shows that a large number of dimples appear in the tensile fracture morphology of the alloy at room temperature.With the increase of Mn content,the dimple depth becomes shallow gradually.The effect of adding C,Al and Nb on the properties of the alloy was studied.When Nb is added into the alloy,the quenching structure of Fe-Mn alloy is obviously refined,which leads to the increase of nucleation core of matrix,the increase of lath martensite lamellae and thinning of spacing thickness of about 1-2?m.At the same time,the tensile strength and yield strength of the alloy are higher than those of the alloy with C element,but the elongation is lower than that of the alloy without Al element.It can be seen that the mechanical properties of the alloy can be improved by properly increasing the content of Nb element.