| Abstract |
| This study was carried out to investigate the effect of fatigue stress magnitude on the tensile properties of the damaged Fe - 22Mn - 12Cr - 3Ni - 2Si - 4Co damping alloy under various fatigue stress magnitudes. α and ε-martensite were formed by fatigue stress in the Fe - 22Mn - 12Cr - 3Ni - 2Si - 4Co damping alloy. The α and ε-martensite formed by fatigue stress in the fatigue damaged damping alloy was formed with a specific direction and surface relief, or crossing each other. With an increasing magnitude of fatigue stress, the volume fraction of α -martensite and ε-martensite was increased, and the increasing rate of volume fraction of α -martensite was more rapid than ε-martensite. At the same fatigue stress magnitude, a large amount of α -martensite was formed than ε-martensite. With the increasing of fatigue stress magnitude, the tensile strength slowly increased and elongation rapidly decreased, and then tensile strength slowly decreased by increasing the volume fraction of α -martensite. The tensile properties of the damaged Fe - 22Mn - 12Cr - 3Ni - 2Si - 4Co alloy under fatigue stress were strongly affected by the α -martensite formed by fatigue stress. This results were the same tendency for metal with the strain induced martensite transformation.
(Received October 08, 2018; Accepted November 29, 2018) |
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| Key Words |
| fatigue stress, damping alloy, martensite, tensile properties, fatigue damage |
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