INFLUENCE OF THERMOCYCLIC TREATMENT MODES ON THE PROPERTIES OF SHKH15 STEEL

Kaparov S. A., Mamatkadyrova B. B., Zholdoshov B. M.

Abstract

An assessment is given to various methods of increasing the resistance
of cold-forming dies of ShKh15 steel by thermal cycling methods. Practical
experiments were carried out in which the temperature of the initial hardening,
the frequency and temperature of the intermediate tempering, the temperature of
the final hardening and tempering were varied. It should be noted that it is not
always necessary to separate in practice the operations in the time of preliminary
quenching and tempering from the final processes. In the case of massive stamps
(in this moment, under the massive one should be understood as stamps with
a wall thickness of more than 30 - 45 mm), it is required to carry out thermal
cycling processing only of the surface layers adjacent to the stamp engraving. In
order to evaluate the influence of the specified parameters of thermal and thermal
cycling on the structure of ball-bearing steel grade ShKh15, an experiment was
performed, in which the temperature values and the number of quenches, as well
as high-temperature intermediate tempering, were varied.