Abstract
In the present study, the ageing precipitation behaviors of Fe-CuNiAlMn steels at different ageing temperatures for 4 h were investigated. The size, number density, crystal structure and composition of co-precipitates at different ageing temperatures were characterized by atom probe tomography (APT) and transmission electron microscopy (TEM). The results showed that with the increase of ageing temperature, the hardness of Fe-CuNiAlMn steel first increased and then decreased, and the hardness peak was obtained at 500 °C for 4 h, which was due to the high-density and small-size co-precipitates with a core-shell structure. Moreover, increasing the ageing temperature will promote the structural transformation of the Cu-rich phase, resulting in the separation of the Cu-rich phase and the NiAlMn-type phase.
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