Martensitic transformation during cyclic deformation and strain fatigue characteristics of Fe-Mn-Si alloy

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作者：
Electromechanics and Materials Engineering College, Dalian Maritime University, Dalian 116026, China [1 ]
不详 [2 ]
不详 [3 ]
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来源：
Cailiao Rechuli Xuebao | 2007年 / 5卷 / 62-65期
关键词：
Cyclic deformation - Epsi martensitic transformation - Strain amplitude - Strain fatigue characteristics - Strain fatigue life;
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摘要：
With XRD analysis, SEM observation and strain fatigue test, it is found that the γ ↔ Ε martensitic transformation and its reverse transformation occur in Fe-Mn-Si shape memory alloy under alternate stress. The repetitive stress induced γ ↔ Ε martensitic transformation and its reverse transformation in Fe-Mn-Si shape memory alloy with the cyclic deformation can increase fatigue life of the alloy by reducing stress concentration, restraining plastic sliding deformation and delaying the formation and growing of microcracks. The bending-fatigue fractured section in Fe-Mn-Si alloy shows brittle fracture.The strain fatigue life of the Fe-17Mn-10Cr-5Si-4Ni alloy with a strain amplitude of ± 1.5% is 1300 cycles, which is about 10 times more than that of U71Mn steel and 1Cr18Ni9Ti steel.
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