Metal Science and Heat Treatment

doi: 10.1007/s11041-019-00365-7pmid: N/A

Rudskoy, A.; Kononov, A.; Kondrat’ev, S.; Matveev, M.

doi: 10.1007/s11041-019-00341-1pmid: N/A

Processes of structure and texture formation in hot rolling of electrical anisotropic steel are studied. It is shown that the structure of the surface layers of hot-rolled strips forms as a result of the joint action of γ → α phase transformation and dynamic recrystallization. The structure of the central layers forms as a result of recovery of deformed grains.

Naumov, A.; Isupov, F.; Golubev, Yu.; Morozova, Yu.

doi: 10.1007/s11041-019-00342-0pmid: N/A

A method for assessing the effect of the temperature of friction stir welding on the microstructure and mechanical properties of welded joints of aluminum alloy D16AT is suggested. The temperature cycles in different zones of a welded joint are determined by mathematical simulation. The computed temperature cycles are implemented in a Gleeble-3800 system. It is shown that the welding temperature affects little the evolution of the microstructure in different zones of the welded joints of alloy D16AT.

Popovich, V.; Borisov, E.; Sufiyarov, V.; Popovich, A.

doi: 10.1007/s11041-019-00343-zpmid: N/A

A novel method for forming “programmed” mechanical properties in local components of a part by controlling the microstructure of the alloy under additive production is suggested. It is shown that the thermal fields acting during the additive production may be used for manipulating the preferred orientation of the growing crystals and forming different-size grains, which affects the mechanical characteristics. A gradient material from a high-temperature nickel alloy Inconel 718 with coarse elongated grains in the core and fine-grained microstructure in the external shell is produced and shown to possess higher operating characteristics than the alloy fabricated by the conventional process.

Razumov, N.; Popovich, A.; Grigor’ev, A.; Silin, A.; Goncharov, I.

doi: 10.1007/s11041-019-00344-ypmid: N/A

Results of a study of the production of spherical-shape powder from shavings of high-alloy high-temperature steel 13Kh11N2V2MF (ÉI961) are presented. It is shown that the rate of feeding of the powder into the flow of thermal plasma affects the process of spheroidization of the particles. The chemical composition of the powder is compared to that required by the GOST standard.

Kondrat’eva, O.; Kondrat’ev, S.; Shvetsov, O.

doi: 10.1007/s11041-019-00345-xpmid: N/A

The microstructure and mechanical properties of alloy VT23 are studied after different variants of quenching and aging. The best combination of mechanical properties is obtained after 1-h water quenching from 850°C and 10-h aging at 550°C. This mode of heat treatment yields a homogeneous globular α + β structure providing high characteristics of strength, ductility and toughness.

Gorynin, V.; Kondrat’ev, S.; Olenin, M.; Mikhailov, M.

doi: 10.1007/s11041-019-00346-wpmid: N/A

The interrelation between the fine structure and the cold resistance of forgings and rolled sheets from ferritic-pearlitic steel 09G2SA-A after heat hardening and additional tempering at 450°C is studied. The additional medium-temperature tempering is shown to raise effectively the cold resistance of the steel due to coagulation and spheroidization of the cementite-type carbides, which make the structure of the steel more equilibrium.

Masaylo, D.; Orlov, A.; Igoshin, S.

doi: 10.1007/s11041-019-00347-9pmid: N/A

Modes of laser cladding of heat-resistant nickel alloy Inconel 625 are considered. The gas-powder flow is studied and optimized as a function of the flow rate of the protective and transporting gas. The effect of the heat treatment modes on the structure and phase composition of the alloy is analyzed. Amode producing compact samples of the alloy is worked out.

Ryl’kov, E.; Isupov, F.; Naumov, A.; Panchenko, O.; Shamshurin, A.

doi: 10.1007/s11041-019-00348-8pmid: N/A

Friction-stir-welded joints of commercial-purity copper and aluminum alloy AMg5 are studied. The effect of the process parameters on the microstructure and mechanical properties of the joints is analyzed. The results of temperature measurements during the welding made with the help of thermocouples are presented. A mathematical model is suggested for computing the temperature field of a weld. The computed and experimental data are compared.

Masaylo, D.; Popovich, A.; Sufiyarov, V.; Orlov, A.; Shamshurin, A.

doi: 10.1007/s11041-019-00349-7pmid: N/A

Laser cladding is used to fabricate a gradient-structure sample from heat-resistant nickel alloy Inconel 625. The structure of the alloy is studied after direct growth at different laser spot diameters. The effect of the heat treatment on the gradient-structure sample is determined. EBSD images of different regions of the article are obtained and analyzed.