Abstract
From an analysis of temperature dependences of the coercive force, contributions of different mechanisms to the formation of the coercive force of steel U9A samples after quenching and tempering have been determined. It is shown that the main contribution to the formation of the coercive force upon tempering at intermediate and high temperatures Ttemp comes from the magnetic hardness of cementite. The coercive force of cementite is determined by its structural state and in the range of tempering temperatures equal to 300–700°C changes along a curve with a maximum, thereby forming a maximum in the Hc(Ttemp) dependence of this steel as well.
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