Analytical electron microscope study of the dissolution of the Fe3C iron carbide phase (cementite) during a graphitisation anneal of carbon steel |
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Authors: | K He A Brown R Brydson D V Edmonds |
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Affiliation: | (1) Institute for Materials Research, University of Leeds, Leeds, LS2 9JT, UK |
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Abstract: | The evolution of microstructure and composition of the Fe3C iron carbide phase (cementite) during a graphitisation anneal of a quenched, medium carbon steel has been studied by analytical
electron microscopy, including energy dispersive X-ray spectroscopy (EDX), electron energy loss spectroscopy (EELS) and energy
filtered transmission electron microscopy (EFTEM) imaging. During heat treatment at 680 °C, dissolution of the cementite particles
dispersed in the martensitic matrix was completed within a time period of 1.5 h, during which time graphite nodules began
to form. However, a non-graphitic carbon-rich amorphous phase was also detected during this heat treatment. It is postulated
that these amorphous particles could be an intermediate stage during the overall graphitisation process. |
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Keywords: | Steels Carbides Graphite Annealing Analytical electron microscopy Electron energy loss spectroscopy |
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