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Abstract
The influence of an external magnetic field of 8 T on isothermal pearlite transformation was studied in an Fe–0·4 mass%C–2 mass%Ni hypoeutectoid alloy, in which both proeutectoid ferrite and pearlite transformations were accelerated by the field. Whereas the pearlite volume fraction increased with decreasing reaction temperature, the magnetic field increased the proportion of pearlite relative to proeutectoid ferrite only at low undercoolings. The interlamellar spacing of pearlite was reduced 5–15% by the magnetic field, which may have led to a substantial increase in growth rate of pearlite nodules. Whereas the pearlite carbon content fell near the paraequilibrium γ/(γ+cem) phase boundary, other features, e.g. interlamellar spacing, seem to be in accord with the condition of non-partition local equilibrium at the pearlite/austenite boundary as reported in Fe–C base hypoeutectoid alloys.
