ε-phase Formation in Solution-Treated and Heated Hadfield Steel

概要

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The effect of isothermal heating on the ε-phase formation is solution-treated standard Hadfield steel was studied. When solution-treated Hadfield steel was heated isothermally at some temperature range, it precipitated a large amount of grain boundary carbides and pearlitic constituents. Consequently, the carbon content in the γ-phase decreased, and then the γ-phase transformed into ε-phase after the specimens were cooled to room temperature. The isothermal temperature range of steels containing the ε-phase at room temperature was shown by a curve of C-form having the nose of 500℃×5 hr and ranging over 450〜625℃. This range corresponds to that in which a large amount of pearlitic constituents precipitated. The existence of the ε-phase at room temperature was verified both by the microstructure and by the X-ray diffraction pattern. This ε-phase transformed into the γ-phase when the specimens were heated at 200〜280℃, which was confirmed by a remarkable expansion in the thermal dilatation curve.
東北大学の論文