Browsing by Author "Bochkareva, A. V."
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Publication Effect of heat treatment on structure and mechanical properties of age-hardening elinvar alloy(AIP Publishing, 2020) Shlyakhova, G. V.; Bochkareva, A. V.; Nadezhkin, M. V.; Zuev, L. B.; Шляхова (Shlyakhova, G. V.), Галина Витальевна; Кафедра «Машины и аппараты химических и атомных производств» (МАХАП)© 2020 American Institute of Physics Inc.. All rights reserved.The experimental results of structure analysis, such as phase composition, grain size, strength and hardness of elinvar Ni-SPAN-C alloy 902 after different modes of heat treatment (quenching and ageing for stress relaxation) are presented in this study. It is made possible to obtain improved physical and mechanical properties than those acquired by conventional heat treatment. Heat treatment mode was selected that allowed to obtaining higher physical and mechanical properties of elinvar alloy compared to standard technology. It was shown that the improvement of alloy structure during thermal treatment is due to thermal stresses, as well as formation and dissolution of intermetallides.Publication Study of cyclic loading impact on structural and mechanical properties of low carbon steel(AIP Publishing, 2019) Zuev, L. B.; Shlyakhova, G. V.; Bochkareva, A. V.; Nadezhkin, M. V.; Шляхова (Shlyakhova, G. V.), Галина Витальевна; Кафедра «Машины и аппараты химических и атомных производств» (МАХАП)© 2019 Author(s).Monitoring of stress-strain state of metalwork is of great importance due to periodically snow load and significant temperature fluctuations that are special features of continental climate of Siberian region. This study allows to analyze cyclic loads effect on structures. Using atomic force microscopy (AFM) methods for examining low carbon steel AISI 1010 under cyclic deformation loading it is obtained that stress relaxation in ferrite grains is carried out by dislocation slip and subsequent grain-boundary sliding. At the same time, with the presence of significant cyclic strain, the relaxation of internal stresses is accomplished by individual ferrite grain boundaries splitting or microcracks initiating. It was found that the appearance of crossed corrugated lines in ferrite grains of steel samples indicates brittle fracture. The influence of microstructure formed during the relaxation of internal stresses on fracture processes development is under discussion.Publication Study of pearlite using atomic force microscopy(2018) Shlyakhova, G. V.; Zuev, L. B. ; Bochkareva, A. V.; Шляхова (Shlyakhova, G. V.), Галина Витальевна; Кафедра «Машины и аппараты химических и атомных производств» (МАХАП)Two different types of pearlite: lamellar and granular were under investigation. The microstructural analysis of eutectoid steel CT80 fine texture were carried out using scanning atomic-force microscopy. The parameters of lamellar and globular pearlite were analyzed. It was shown that steel annealing near the melting point destroys the typical lamellar structure of eutectoid pearlite. Spheroids of various sizes dispersed in the ferrite matrix appeared instead of cementite plates. It was indicated that carbide inhomogeneity in globular pearlite is of a greater extent than in lamellar pearlite. The hardness of granular and lamellar pearlite was 176 HV and 243 HV correspondingly