| Title |
A Study on Damping Capacity of Fe-(17~23)%Mn Martensitic Alloys |
| Authors |
전중환(Joong Hwan Jun); 이영국(Young Kook Lee); 최종술(Chong Sool Choi) |
| Abstract |
The effects of ε martensite content and strain amplitude on damping capacity of Fe-(17~23)%Mn martensitic alloys have been investigated to Clarify reson that Fe-17%Mn alloy shows the maximum damping capacity among Fe-Mn binary system. It was observed that the damping capacity of Fe-(17~23)%Mn alloys were decreased with increasing manganese content when the specimens had similar amount of ε martensite. The deterioration of the damping capacity with increasing manganess content is attributted to the following two factors: (l)The decrease in density of stacking faults in ε martensite and γ/ε interface areas. (2) The decrease in mobility of γ/ε interface. Below 3×10-4 strain amplitude, the damping capacity of Fe-17%Mn alloy was linearly Proportional to the ε martensite content, which suggests that stacking faults and variant boundaries in ε martensite plates are the principal damping sources. Above 4×10-4 strain amplitude, however, a maximum damping capacity was observed around 60~70vol.% ε. This means that γ/ε interface acts as the damping source in addition to the stacking faults and variant boundaries in Fe-17%Mn alloy. |