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Actual Problems in Machine Building. 2015. N 2
Materials Science
in Machine Building
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SURFACE HARDENING OF STEELS FOR MINING EQUIPMENT COMPONENTS
Maksimov A.B.,
Ph.D. (Engineering), Associate Professor, e-mail:
aleksandrmks@yandex.ruGulyaev М.V.,
Ph.D. (Military), Associate Professor, e-mail:
aladin58@mail.ruKerch State Maritime Technological University, 82 Ordzhonikidze str., Kerch, 298300, Republic of
Crimea, Russian Federation.
Abstract
It is necessary to increase durability of steel components used in coal machine building.
Application of local buildups and a more complex chemical composition of steels lead to higher
production costs and deterioration of weldability. In this regard, the use of sparingly alloyed steels
such as14Г2 is of practical interest. The distribution of the temperature field across the thickness of
the plate in the process of unilateral accelerated cooling with different heat transfer coefficients is
studied. It is shown that the cooling rate through the thickness of each layer of the plate first
increases and then decreases. The hardness of steel decreases with increasing the distance from a
surface being rapidly cooled. Using thermokinetic diagrams of austenite decomposition helps to
select the necessary parameters of cooling.
Keywords
one-sided cooling, heat transfer coefficient, hardness, cooling rate, thermokinetic diagram of
austenite decomposition, steel