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Technical Note

Determination of the optimal temperature regime of plastic deformation of micro alloyed automobile wheel steels

Sergiy Sheyko1, Volodymyr Tsyganov2, Oleksii Hrechanyі1, Tetyana Vasilchenko1, Anastasiia Hrechana3

1Department of Metallurgical Equipment Zaporizhzhia National University, Zaporizhzhia, Ukraine
2Department of Metal-Cutting Machines and Tools National University «Zaporizhzhia Polytechnic», Zaporizhzhia, Ukraine
3Master of Law, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Kyiv, Ukraine

Keywords

Abstract


Plastic deformation; 

     Car wheel rims;

 Thermokinetic diagram;

 Microalloying


It has been established that hot plastic deformation microalloyed steel 10HFTBch type accelerates the excretion of pearlite and causes structure refinement during subsequent cooling due to an increase of start of new phases’ centers. This leads to the formation of a fine-grained dispersed two-phase structure consisting of ferrite with a high dislocation density and pearlite. It has been determined that at the optimum deformation temperature the prevailing mechanism of structure refinement is the fragmentation of austenitic and ferrite grains of a common initial orientation into misoriented subgrains (fragments) with low-angle dislocation boundaries of deformation origin. A thorough thermokinetic analysis of the course of this process made it possible to determine the optimal temperature regime for plastic deformation for this type of steel, which is 850-900 °C. Plastic deformation increases the range of of pearlite’s transformation existence rates by 2.5 times, it was found that after 30% deformation at 950 °C, pearlite transformation begins at a cooling rate of 5 °C/s, and without deformation at 2 °C/s.

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2023 Reviewer Awards:

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2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.



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The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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