Abstract
The temperature and degree of hot deformation for steel 10HFTBch have been determined. This made it possible to ensure an increase in the mechanical properties of this steel, namely, the ultimate strength up to 540–560 MPa, as well as the relative elongation up to 25–29 %. As a result, it became possible to increase the service life of wheels with increased carrying capacity. This, in turn, will make it possible to increase the load of the transported cargo by motor vehicles several times. The mechanism of the influence of the energy-power parameters of rolling on the formation of the macro- and microstructure of a two-phase steel in the process of hot deformation is disclosed. The applied scheme provided an increase in the homogeneity of the structure of the developed steel, which saved the central part of the rolled section from overheating. It has been established that a decrease in the temperature of the end of deformation leads to a decrease in the size of the recrystallized austenite grain, and, consequently, to a refinement of the ferrite grain. Also an important factor in preventing the growth of ferrite grains in the upper part of the ferritic region is the abolition of cooling of the steel in coils. The recommended mode for multicomponent alloy steel 10HFTBch is as follows: the temperature of the end of rolling is 850 °C, the beginning of accelerated cooling is 750 °C, and the temperature of strip coiling into a coil is 600 °C. The basis for ensuring the increased strength of two-phase steels is the ratio and distribution of structural fractions – ferrite (initial and precipitated from austenite), as well as martensite. When hardened by such traditional "martensite formations" as manganese, the ability to control properties is limited. This is reflected in a narrow range of variation in the strength and ductility of the developed steel. The optimal combination of strength characteristics of plastic properties reduces the metal consumption of the product by 15–25 %.
Highlights
The development of road transport in the world determines the vector of requirements for increasing loads and speed of movement of freight vehicles, creating road trains
The recommended mode for multicomponent alloy steel 10HFTBch is as follows: the temperature of the end of rolling is 850 °C, the beginning of accelerated cooling is 750 °C, and the temperature of strip coiling into a coil is 600 °C
In the study [2], it was shown that a promising direction in the development of optimal control of cargo transportation is the development of wheels for road trains with a carrying capacity of up to one railroad car, i.e, 60 tons
Summary
The development of road transport in the world determines the vector of requirements for increasing loads and speed of movement of freight vehicles, creating road trains. This makes it necessary to improve the unsprung part of the car, including the rims and wheel disks, which are critical parts. The number of flights is reduced, which leads to significant savings in fuels and lubricants, wheels of carriers [1] This requires a thorough study of new grades of hardened steels, focused on specific technical requirements, and, differing in the method of hardening alloying. The determination of the optimal thermomechanical parameters for the processing of such steels, in order to improve the mechanical properties, is an urgent task [1]
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