The observations given by Ohtani et al are analyzed in the present paper and it is concluded that the kinetics of temper embrittlement in titanium-doped low carbon NiCr steel agree well with those of non-equilibrium grain-boundary segregation of Sb. Besides, the mechanism of non-equilibrium grain-boundary segregation of Sb is determined to be the most satisfactory one among the existed mechanisms in the literature to interpret the Sb-induced embrittlement kinetics in the NiCr steel. Based on the conclusion and the determination, the activation energy and frequency factor of diffusion of Sb-vacancy complexes are obtained for the first time according to the concept of critical time in non-equilibrium grain-boundary segregation theory. The calculated results can give theoretical basis for predicting and controlling over the Sb-induced embrittlement in steels.
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