Studying the effect of magnetic treatment modes on changes in hardness and heat capacity of fast-cutting steels after treatment by a pulsed magnetic ield
Abstract
Kindenko N. I. Studying the effect of magnetic treatment modes on changes in hardness and heat capacity of fast-cutting steels after treatment by a pulsed magnetic ield // Herald of the DSEA. – 2019. – № 2 (46). – P. 77–82.
The present work is devoted to the study of issues related to improving the operational properties of tools from high-speed steels by means of magnetic-pulse processing. The analysis of the effect of magnetic treatment on the change in hardness and heat capacity of high-speed steels after treatment with a pulsed magnetic field is carried out. It is shown that the effectiveness of the magnetic treatment method depends on a number of factors relating both to the conditions of exposure to a tool by a magnetic field, and to the conditions in which this tool is operated. It was established that as a result of the impact of a pulsed magnetic field, the physicomechanical properties of high-speed steels change, the cold and hot hardness increases, and the tool material becomes more uniform in structure. It is noted that the primary cause of improving the performance of a tool subjected to magnetic treatment is the change in the properties of the tool material, which occurs due to the magnetostriction hardening of high-speed steel. It is shown that for a stable manifestation of the effect of magnetic treatment of an instrument, it is necessary in each specific case to take into account the value of the magnetic field strength, the dwell time of the instrument in the working inductor, and the aging time of the instrument after magnetic treatment. It has been established that an increase in tool life is not due to deficiencies in heat treatment, manifested in an increase in cold hardness, but due to an improvement in the properties of the tool material and, above all, such operational properties as hardness and heat resistance.
References
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Kindenko N.I., Motov V.A. Justification of the technological limits of the application of the method of magnetic processing of a punch punch and drills of high-speed steels in pulsed magnetic fields. Materials working by pressure. Kramatorsk: DSEA. 2016, 2 (43), рр. 165-169 (in Russian).
Kindenko N.I. The wear mechanism and operability of a tool made of high speed steel and hardened by the IMP method. Herald of the DSEA. Kramatorsk: DSEA. 2018, 2 (44), рр. 120-124 (in Russian).
