On the Reasons for the Non-Unique Behavior of Structure-Sensitive Magnetic Characteristics of Alloyed Carbon Steels under Tempering

摘要

The effect of the alloying elements Mn, Cr and Si on the magnetic hysteretic properties of cementite and model steels with a carbon content of 0.6 mass % is studied. Alloying with carbide-forming elements (Mn, Cr) are shown to reduce the coercive force and the Curie point of cementite. Temperature measurements of the coercive force of model steels with a carbon content of 0.6 mass % alloyed with manganese, chromium or silicon have been made at temperatures ranging between -196 and 300°C. It has been ascertained that the local peak of the coercive force of the steels in this range of temperatures falls on the Curie point of carbide phase precipitates. The behavior of the coercive force of alloyed steels depending on tempering temperature ranging between 250 and 700°C is shown to be governed mainly by the coercivity and kinetics of the formation of cementite precipitates.