Abstract
The austenitic steels based on the Fe-Mn-Al-C system are relatively less expensive than those from the Fe-Cr-Ni-C system due to their being nickel-chromium free stainless steels. The fatigue crack growth (FCG) behavior and elastic-plastic fracture toughness (J - integral) of an alloy of the Fe-Mn-Al-C system have been studied at room temperature. This fatigue crack growth study revealed a bilinear form of behavior in relation to the Paris approach. Fractographic studies confirmed that the crack growth micromechanism changes from being microstructure-sensitive to being structure-insensitive when the reversed plastic zone size exceeds the grain size of the material. This change is accompanied by a change in crack closure mechanism from a roughness-induced to a plasticity-induced one. The Ni-Cr free austenitic steel offers better fatigue crack growth resistance as compared to that for the conventional 304L type stainless steel containing Ni-Cr. It also is found to possess a high fracture toughness (JIc) value of 187 kJ/m2 comparable with other grades of stainless steel containing nickel and chromium.
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