Abstract
Austenitic Fe-8.7Al-29.7Mn-1.04C alloy (where the composition is in approximate weight per cent) was cyclically deformed at various total strain amplitudes. The microstructural changes induced by fatigue at room temperature were examined by transmission electron microscopy. At low strain amplitudes, it was found that the substructure consisted of well-developed loop patches and veins. However, at high strain amplitudes a series of closely spaced ladder-like persistent slip bands was formed in the alloy investigated. Furthermore, K phase Fe 3AlC x particles were induced in the Fe-8.7Al-29.7Mn-1.04C alloy during cycling at high strain amplitudes.
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