Abstract
The fraction of deoxidation particles of MgO, ZrO2 and Ce2O3 on austenite grain boundaries in an Fe–10mass%Ni or Fe–0.20mass%C–0.02mass%P alloy has been measured as a function of dissolved Ce content. The fraction of particles on grain boundaries, ΦA, which is defined by the ratio of the number of particles at the grain boundaries per unit area and the number of particles at the grain boundaries and the interior of the grain per unit area and the ΦA value at random dispersion, ΦR(2-D), attend the steady state within 60 min holding at 1 673 K. The ΦA and ΦR(2-D) values increase with the addition of very small amount of dissolved Ce and thereafter are independent of dissolved Ce content. The DA/dA (limiting mean grain diameter/mean particle diameter) ratios decrease with an increase in ΦA for a given volume fraction of particles.
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