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Korean Journal of Metals and Materials > Epub ahead of print
Effect of Stress Magnitude on the Tensile Properties of Damaged Damping Alloy Under Fatigue Stress
피로손상된 제진합금의 인장성질에 미치는 피로응력 크기의 영향(Effect of Stress Magnitude on the Tensile Properties of Damaged Damping Alloy Under Fatigue Stress)
Received: 8 October 2018;  Accepted: 29 November 2018.  Published online: 8 January 2019.
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.
Keywords: fatigue stress, damping alloy, martensite, tensile properties, fatigue damage
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