Failure of hot gas sprayed coatings in combined deformation with the substrate

Conclusions The nature of failure of the examined hot gas sprayed coatings in combined deformation with the substrate metal depends on the relation between the cohesion strength of the coating material and adhesion strength of the coating-substrate boundary. This ratio is determined mainly by the porosity and degree of oxidation of the coatings. The main cracks form in these coatings at stresses similar to the yield stress of the substrate metal.Translated from Poroshkovaya Metallurgiya, No. 10(310), pp. 45–48, October, 1988.     

Formation of submicrocrystalline structure in titanium and titanium alloys and their mechanical properties

The effect of deformation temperature on the grain size in titanium VT1-0 and double-phase titanium alloy VT6 is studied. The temperature-and-rate modes of formation of submicrocrystalline structure are determined. The mechanical behavior and the evolution of the microstructure in the course of warm severe deformation is investigated by means of successive compression of specimens over three orthogonal directions at a temperature of 400°C for titanium and 550°C for alloy VT6. The mechanisms of grain refinement in severe deformation are determined. It is shown that they differ depending on the composition of the alloy. The method of “abc”-deformation is used for fabricating large-mass preforms from titanium VT1-0 and alloy VT6 with submicrocrystalline structure; large-size sheets are produced from alloy VT6. __________ Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 19–26, February, 2006. Grant of Russian foundation for fundamental research No. 05-08-65396-a.     

An electric arc in a channel bearing a turbulent gas flow

A study of the positive column in an arc in a tube containing a turbulent gas flow is presented. Working formulas are given for estimating the arc parameters.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 35, No. 1, pp. 113–120, July, 1978.     

State and prospects of the production of compressor equipment at the Kazan' Compressor plant

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 11, pp. 75–78, November, 1995.     

The influence of texture on superplasticity of the titanium alloy VT 6

This paper describes a specific influence of crystailographic texture on tensile properties of the titanium alloy VT6 under superplastic flow conditions. The texture effect has been examined on alloy states with identical microstructures but with different preferred grain orientations. Tests over wide temperature and strain-rate intervals have shown that the formation of a strong texture as a result of pretreatment of a titanium alloy leads to a decrease in flow stress, an increase in plasticity and a shift of the optimum strain-rate region to higher rates. Data on the effect of texture on the anisotropy of properties of the VT6 alloy are also presented. The present results suggest that the influence of preferred orientation on the characteristics of superplastic flow is a general phenomenon for finegrained superplastic materials.     

Experimental and numerical investigation of the electrophysical properties of products of combustion of hydrogen in oxygen seeded with alkali metals

Results are given of experimental and numerical investigations of electrical conductivity and mobility of electrons in the products of combustion of hydrogen-oxygen fuel seeded with cesium or potassium-sodium eutectic. The experiments were performed in model (flow rate of 0.9 kg/s, thermal power N _th ≈7 MW) and large-scale experimental (flow rate ≈12 kg/s, N _th ≈ 150 MW) facilities with the pressure in the combustor ranging from 2 to 6 MPa, oxidizer excess coefficients of 0.6 to 1.1, mass fractions of the seed in the fuel of 0.3 to 0.9 with the Mach number M ≈ 2.4. The basic characteristics, structural schemes, and general views of the facilities are given. When cesium is used for seeding, the experimentally obtained values of electrical conductivity may be as high as σ_el ≈ 20 S/m, those of σ_elν² ≈ 115 S/m (km/s)², and of electron mobility ? 0.11 T^?1 at a pressure of ≈0.3 MPa, temperature of ≈2800 K, and flow velocity ν ≈ 2500 m/s. Under the same conditions for combustion products seeded with KNa eutectic, we have σ^el ≈ 9 S/m, σ_elν² ≈ 65 (S/m)(km/s)², and electron mobility of 0.09 T^?1.