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Carbon redistribution is known to occur during martensite ageing. The two associated processes most discussed in the literature are spinodal decomposition and carbon segregation to defects. In order to elucidate the topic, the ageing and tempering of two Fe-Ni-C alloys have been characterised by means of atom probe tomography and synchrotron radiation diffraction. Upon ageing at room temperature, carbon redistribution is clearly observed, where the process of carbon segregation to defects appears to be most likely to occur. Nevertheless, the possibility of spinodal decomposition is not entirely discarded, and the current work presents a series of discussion points that challenge our current understanding of the thermodynamic of ferrite in steels. ARTICLE HISTORY

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IN the original article there is an error in the first sentence of the abstract. bcc-to-bcc should be fcc to bcc. The corrected sentence is as follows:In this paper, we describe the effects of mechanical loading on fcc to bcc phase transformations of an Advanced High Strength Steel during cooling.