Abstract
The effect of isothermal heating on the ε-phase formation in solution-treated standard Hadfield steel was studied. When solution-treated Hadfield steel was heated isothermally at some temperature range, it precipitated a large quantity of grain-boundary carbides and pearlitic constituents. Consequently, the carbon content in the γ-phase decreased, then the γ-phase was transformed to ε-phase after the specimens were cooled to room temperature. The isothermal temperature range of steels containing the ε-phase at room temperature shaped a C-curve which has the nose of 500°×5 hr and extending over the temperature range of 450∼625°. This range corresponds to the range in which a large quantity of pearlitic constituents were precipitated. The existence of the ε-phase in steels at room temperature was observed in both the microstructure and the X-ray diffraction pattern. This ε-phase was transformed to the γ-phase when the specimens were heated at 200∼280°,and this transformation was confirmed as a remarkable expansion in the thermal dilatation curve.
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