Registration Number
0223U003947,
0122U201170
, R & D reports
Title
Increasing the properties of steels and alloys by atypical processing technologies
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Head
Malysheva Inna Yu., Кандидат технічних наук
Registration Date
27-07-2023
Organization
State Higher Educational Institution "Azov State Technical University"
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The object of study is the properties of products made of structural steels and alloys that have been subjected to atypical methods of heat hardening. Purpose - to improve the mechanical properties of metal products by alloying, modern variants of thermal bulk and surface hardening. Research methods: metallographic analysis, microhardness measurements, testing of standard mechanical properties, testing for wear resistance, dynamic crack resistance, mathematical modeling of critical points, phase composition using the JMatPro computer program. By varying only the end-of-roll temperature and cooling rate, the yield strength of S355J2 steel microalloyed with the V+Nb+Al complex can be increased by 29.5%, from 420 to 544 MPa. The high level of properties can be achieved by roll-heating treatment, which has undeniable economic benefits. The maximum wear resistance values of 25KhGT steel (ε=1.5) correspond to a microwave hardening temperature of 1000 °C, which can be explained by the optimal phase composition: needle martensite, carbides, and residual austenite (≈40 %) capable of strain martensite ' transformation. The effect of manganese content on hardness, impact strength, abrasive and impact-abrasive wear resistance of Fe-Mn-C cast irons was determined. The higher the degree of DFS development and the amount of martensite and carbide phases formed during wear, the greater the wear resistance of cast irons. By optimizing the composition, structure, and size of the coating layers after plasma hardening of large-sized, heavily loaded products, a combination of performance properties that are several times higher than the baseline level should be achieved. Thermocyclic treatment significantly changes the phase composition of the studied steels, their microstructure and the degree of austenite metastability, which determines the level of wear resistance. In general, for each type of heat treatment used, the optimal parameters that achieve the highest level of wear resis
Product Description
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Yefremenko Vasyl H.
Malysheva Inna Yu.
Oleynik Inna M
Ryabikina Marina A
Samotugina Uliya S
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2023-07-27
