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Information × Registration Number 0216U006710, 0113U002678 , R & D reports Title Development of steel with nitride dispersion strengthening and technology of its melting and heat treatment of railway wheels increased resource exploitation. popup.stage_title Head Naydek Vladimir Leontevich, Registration Date 28-04-2016 Organization Physico-technological institute of metals and alloys National academy of Sciences of Ukraine popup.description2 Purpose - to increase up to the world level of operational reliability and durability of the rail transport in conditions of high speeds and capacity of rolling stock through the use of new high-thermomechanical wheel steels provide enhanced (at least twice), wear and pitting of rolling wheels, and the creation of rapid methods for determining the resource wheels on the criteria of cyclic crack resistance, resistance pittingcreating and subsurface delamination (flaking), taking into account the influence of operational factors (thermal-braking, low climatic temperatures, corrosive environments, etc.). The work performed. The thermodynamic parameters of the phase redistribution of nitrogen and vanadium austeniting and tempering steel wheel with the dispersion hardening and nitride of the optimal temperature that will ensure dispersion of austenite grain and effective precipitation strengthening of ferrite. These temperatures in the 100-150 ° C higher than the temperature for the standard steel wheel. It was found that by increasing the stability of the austenite solid solution nitrogen is reduced by 20 ... 65 ° C temperature ranges ? perlit, ? beynit and ? martensit transformation allows to reduce by 15-25% the speed of the air cooling sprayer water wheels at quenching. Nitride dispersion strengthening provides for close values of ductility and toughness increase of 140 ... 400 MPa - ?t 120 ... ?v 370MPa and at a close level of strength - a significant increase in the fracture toughness. Thus KSV at 20 ° C is increased to 3 times, and at minus 40 ° C - 5 times. Nitride dispersion strengthening in all kinds of steel structure (tempered perlit, beynit, martensit) increases 1.3 ... 1.5 times the fatigue endurance and cyclic crack resistance, up to 2 times the wear resistance under dry sliding friction and 1,4-1, 6 times at rolling friction, reducing to 2 times the probability of the formation of defects, such as "slider". The projected increase in the service life of the wheels is not less than 2 times. According to the results of laboratory tests were developed and sent to Ukrainian Railways and JSC "Interpipe NTZ" study the feasibility of a pilot-scale test production of steel wheel nitride dispersion strengthening, production of a pilot batch of wheels, their factory and bench testing. Proposals discussed at two meetings of the director of technical policy Ukrainian Railways and received approval. Pre-defined venture for the manufacture of a pilot batch (20-25t.) Quality steel wheel with the dispersion hardening nitride. This GP "Factory UBVT" (Sumy).5481 Product Description popup.authors Бабаскін Юрій Захарович Довготелес Віталій Вікторович Золотар Ніна Яківна Короленко Валентина Петрівна Короленко Дмитро Миколайович Литвин Анатолій Тимофійович Радченко Зінаїда Миколаївна Степанова Тетяна Василівна Шипицин Петро Якович Шипицин Сергій Якович popup.nrat_date 2020-04-02 Close