가공열처리한 Fe-20Mn-12Cr-3Ni-3Si 합금의 강도와 감쇠능의 상호관계

Abstract

This study was processed to investigate the co-relationship between the mechanical properties and damping capacity of thermo-mechanical treated Fe-20Mn-12Cr-3Ni-3Si alloy. αʹ and ε-martensite were formed by deformation and thermo-mechanical treatment. With the increasing cycle number of thermo-mechanical treatment, volume fraction of ε-martensite was increased, and then decreased, whereas dislocation and αʹ-martensite were slowly increased. In 5-cycle number thermo-mechanical treated specimens result showed more than 10% of the volume fraction of ε-martensite and less than 3% of the volume fraction of αʹ-martensite. With the increasing number of thermo-mechanical treatment, the strength rapidly increased, but the damping capacity was slowly decreased, and results of damping capacity was the opposite to tendency for a metal with deformation induced martensite transformation. The damping capacity was decreased with the strength increasing, these results was opposite to tendency for metal with deformation induced martensite transformation. The strength was affected to formation of martensite and dislocation, grain refining by thermo-mechanical treatment, damping capacity was affected formation of dislocation and grain refinement.