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Microstructure of steel heated in an electric furnace and desulphurised (E technology), hardened at 880 °C, and tempered at: (a) 200 °C tempered martensite, (b) 300 °C tempered martensite with metastable carbides, (c) 400 °C tempered martensite with cementite formations, (d) 500 °C sorbitol, and (e) 600 °C spheroidite [49].
