INFLUENCE OF THERMOMECHANICAL ROLLING SCHEDULES ON SCREW-SHAPED AND FLAT ROLLS AND NITRIDING SCHEDULES ON THE STRUCTURE AND MECHANICAL PROPERTIES OF P6M5 STEEL CUTTERS
Abdirova R.D. Mashekov S.A. Fedorov S.V. Absadykov B.N. Ibragimova R.R.
2021National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2021#6Issue 45015 - 22 pp.
The article studies the influence of the number of passes during rolling (cogging) of blank part in helical and smooth rolls on the formation of structures, mechanical and plastic properties of tool steel P6M5 after thermomechanical processing under different modes and low-temperature ion nitriding. It is shown that cogging in helical rolls with twelve passes and one pass in smooth rolls allows to obtain an ultra-finegrained (UFG) structure in surface zone of the rolled strips. It is established that nitriding of the surface zone with a coarse-grained structure contributes to the surface hardening of the samples, changes in the strength characteristics of steel, and reduces the plastic properties, which is due to the formation of a crushable surface layer on the samples. It is proved that when nitriding workpieces with a UMP structure, a hardened layer is formed that is less prone to brittle fracture. The results of analysis and estimation of the thickness of the nitrided layer after rolling in HR (helical roll) and PR (plain roll) under various thermomechanical conditions and nitriding at a temperature of 500 ° C are presented. It is established that ion nitriding under the selected temperature-strain mode allows almost 2 times to increase the microhardness of the surface during nitriding, and the thickness of the near-surface layer increases under thermomechanical processing of HR with twelve passes.
helical and smooth rolls , ion nitriding , mechanical properties , microhardness , steel R6M5 , structure
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Satbayev University, Almaty, Kazakhstan
Moscow State University of Technology «STANKIN», Moscow, Russian Federation
A.B. Bekturov Institute of Chemical Sciences, Almaty, Kazakhstan
Shakarim University of Semey, Semey, Kazakhstan
Satbayev University
Moscow State University of Technology «STANKIN»
A.B. Bekturov Institute of Chemical Sciences
Shakarim University of Semey
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