Purpose. Assessing the impact of technological parameters on the properties of the complex in the manufacture of valves with a high level of safety. Methodology. Material for the study was selected alloy steel 20ХГС2. Curing rods with a diameter of 6,5 mm was performed rapid cooling from temperatures of 1080…1100 °C. The heating was carried out in Vacation chamber furnaces. Cold plastic deformation was carried out by drawing. Mechanical properties were determined from the analysis of stress-strain curve. The microstructure was studied using light microscopy and methods of quantitative metallographic. The parameter evaluating thin crystalline structure of the metal line width has been used ( ) x-ray interference (220). Findings. Shows the change in the properties of the complex as a function of temperature end of accelerated cooling of steel wire rod, which is being investigated. The analysis of the structural state of rolled after heat strengthening and after various degrees of plastic deformation by drawing. Shown that 20…30 % after deformation rapidly cooled to a temperature of steel 20ХГС2 580…600 °C, elongation is maintained at the level of 6 %, while the strength reaches at values of 2000-2100 MPa. Using the tempering at an intermediate temperature can improve the plastic properties of the pre-heat-strengthened, cold-rolled steel. Originality. The deformation of the thermally bonded low-alloy steel 20ХГС2 accompanied by a monotonic decrease in the line width of x-ray interference (220). Rate of increase in strength during cold deformation of steel martensite-bainite structure is due to the simultaneous development processes from the decay of the softening of martensitic structures and deformation strengthening. Practical value. The research results can be used to develop high-technology manufacturing reinforcing bar in an industrial environment for steel making

Currently, cast iron remains one of the major modern casting materials in metallurgy and machine-building industry and is sure to take the lead in the future. Chilled cast iron has high hardness and wear resistance due to a large number of carbide phases in its structure. However, low ductility and impact hardness essentially limit its applicability in terms of processing. Hot plastic working, under which the eutectic net crushing is observed, appears to be one of the most effective means of the eutectic alloy products shape and microstructure transformation. Chilled cast iron properties fundamentally improve after hot plastic working: ductility, strength and impact hardness increase by 2-3 times on retention of the high hardness factor. Chilled cast iron ductility increase can be attained when using phase transformations in eutectic cementite under lean alloying with carbide forming elements. The purpose of the paper is to study alloying effect on the chilled cast iron ductility as well as eutectic cementite behavior under hot rolling. In the paper hardening and softening of the structural components in chilled cast iron under hot working have been studied. The deformation texture forming in eutectic cementite under hot rolling has been revealed, which is connected with the dynamic softening and depends on the degree and the nature of its alloying. The mechanism and regularities of the phase transformation effect in cementite on its behavior under plastic deformation and on the alloys ductility in general have been studied. In cementite chromium alloying initiates processes, that can be characterized as the pre-precipitation stage of the new phases, and this way it contributes to the cast iron ductility reduction and embrittles cementite. Carbide transformation, that occurs in eutectic cementite under alloying with vanadium, stimulates softening of the alloy and increases its ductility level. Moreover, the multiple glide planes {130},{011},{112} in cementite have been determined. It has been found out, that in supersaturated cementite vanadium carbides precipitation stimulates the extra glide plane {111} occurrence under hot rolling. The essence of the carbide transformation phenomenon is that under hot working there occurs the lubricating effect at the transition of the metastable iron carbide condition, which is strengthened with vanadium supersaturation and mechanical hardening, to a more stable condition due to precipitation of the proeutectoid constituents on the one hand, and because of the dynamic softening processes on the other hand. At that, the autocatalyticity effect is observed: there is precipitation of carbides with hardening and softening, similar to the processes that arise as a result of the superplastic effect induced by phase transformations.

Causes of reasons and explanation of mechanism forming damages of railway wheels tread were investigated. At slipping on contact surfaces wheelrail a between by simultaneous development of processes of work-hardening and softening metal determines the terms of origin damages of railway wheels tread were fixed.