Abstract
Magnetic properties of a model steel with 0.6 wt % C doped with Si are studied. It is found that the dependence of coercive force on the tempering temperature (Ttemp) of the model steel doped with 2 wt % Si is due to features of the kinetics of cementite formation in steel. From the temperature dependences of the coercive force HC of the steel, it follows that Si shifts the beginning of the carbide formation to the region of a higher Ttemp. Аn explanation of a high value of НС at Ttemp ≈ 500°C of the steel containing 2 wt % Si compared to that of the plain carbon steel is also given. It is associated with the coercivity of cementite, as a hard magnetic phase with size of precipitates close to the size of single domains.
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