발간논문

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Vol.34, No.11, 1399 ~ 1407, 1996
Title
A Study on Damping Capacity of Fe-(17~23)%Mn Martensitic Alloys
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.
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