Papers by Author: Rustam Kaibyshev

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Authors: Rustam Kaibyshev, Taku Sakai, Ilya Nikulin, F. Musin
Authors: A. Morozova, A. Dolzhenko, M. Odnobokova, Alexander P. Zhilyaev, Andrey Belyakov, Rustam Kaibyshev
Abstract: The microstructure evolution during the annealing treatment of a recycled copper after cold rolling to total strain of 2.6 was investigated. The cold deformation resulted in the elongation of initial grains along rolling direction and the strain-induced formation of subboundaries. Annealing recovery occurred in the temperature range 100-250 °C. The recrystallized microstructures were observed after annealing at 300-400 °C. The hardness of partially recrystallized copper samples was interpreted in terms of dislocation strengthening. The recrystallization kinetics was estimated according to a Johnson–Mehl–Avrami–Kolmogorov equation using different methods for recrystallized fraction determination, i.e., the fractional softening, the grain orientation spread, and the Kernel average misorientation.
Authors: Arthur Galiyev, Rustam Kaibyshev, Taku Sakai
Authors: Valeriy Dudko, Rustam Kaibyshev, Andrey Belyakov, Yoshikazu Sakai, Kaneaki Tsuzaki
Abstract: The creep behavior of oxide-bearing Fe-0.6%O steel was studied in the temperature range of 550-700°C at stresses ranging from 100 to 400 MPa. The creep data showed high values of an apparent stress exponent n close to 16 for power-law creep. In addition the apparent experimental activation energy was much higher than that for the lattice diffusion in -iron. Analysis of creep data revealed that the deformation behavior was strongly affected by the threshold stresses, which are associated with the interaction between moving dislocations and fine incoherent oxide particles. Analysis of deformation behavior in terms of threshold stress leads the true stress exponent of 8; the activation energy for creep became close to value of activation energy for lattice diffusion at 700°C and for pipe-diffusion in the temperature range of 550–650°C.
Authors: Rustam Kaibyshev, Oleg Sitdikov, Alexandre Goloborodko, Taku Sakai
Authors: Rustam Kaibyshev, I. Kazakulov
Authors: Vener Valitov, Rustam Kaibyshev, N. Gajnutdinova
Authors: Zhanna Yanushkevich, Andrey Belyakov, Rustam Kaibyshev, Christian Haase, Dmitri A. Molodov
Abstract: The regularities of static recrystallization in an Fe-0.3C-17Mn-1.5Al TWIP steel subjected to cold rolling and annealing were studied. The cold rolling led to noticeable increase in the dislocation density, extensive mechanical twinning and shear banding. The subsequent annealing resulted in the development of recovered or recrystallized microstructure depending on the rolling reduction and the annealing temperature. An increase in the rolling reduction promoted the recrystallization development, which led to ultrafine-grained microstructure with a grain size below 10 μm. The developed ultrafine-grained steel samples are characterized by beneficial mechanical properties.
Authors: Andrey Belyakov, Alla Kipelova, Marina Odnobokova, Iaroslava Shakhova, Rustam Kaibyshev
Abstract: The development of ultrafine grained structures in 316L and 304-type austenitic stainless steels subjected to large strain cold working and subsequent annealing and their effect on mechanical properties were studied. The cold rolling was accompanied by a mechanical twinning and a partial martensitic transformation and resulted in the development of elongated austenite/ferrite grains with the transverse size of about 50 nm at a strain of 4. The grain refinement by large strain cold working resulted in an increase of tensile strength above 2000 MPa in the both steels. Annealing at temperatures above 500°C resulted in ferrite-austenite reversion. However, the transverse grain/subgrain size remained on the level of about 100-150 nm after annealing at temperatures up to 700°C.
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