Actual Problems in Machine Building 2015 No. 2

Actual Problems in Machine Building. 2015. N 2 Materials Science in Machine Building ____________________________________________________________________ 374 2. Максимов А.Б. Устойчивость термически армированного проката при продольном изгибе / В Кн. II Научные чтения им. И.А. Одинга «Механические свойства современных конструкционных материалов» –М. – 2014. – С. 184-185. 3. Теплотехнический справочник. Под ред. Юренева В.Н. и Лебедева П.Д. –М.: Энергия. 1976. Т2. – 896 с. 4. Попов А.А., Попова А.Е. Изотермические и термокинетические диаграммы распада переохлажденного аустенита. Изд.: Металлургия. – 1965. – 495 с. SURFACE HARDENING OF STEELS FOR MINING EQUIPMENT COMPONENTS Maksimov A.B., Ph.D. (Engineering), Associate Professor, e-mail: aleksandrmks@yandex.ru Gulyaev М.V., Ph.D. (Military), Associate Professor, e-mail: aladin58@mail.ru Kerch 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