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The detailed evolution of the graphitized microstructure of carbon steel during annealing has been studied by thin-foil transmission electron microscopy, enabled by the refined dispersion of small graphite nodules produced. The graphitization annealing of 0.38wt.% carbon steel in the quenched martensitic state resulted in the formation of graphite nodules, of the order of 2–5μm in diameter, after...
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