Key Engineering Materials Vol. 822

Abstract: The paper presents the results of tribotechnical studies of anti-wear properties of iron-based coatings for light-alloy drill pipes made of aluminum alloys. The description of the tribotechnical stand simulating real processes of drilling in a wide range of conditions is given. Also, the analysis of corrosion resistance of coatings by electrochemical analysis was carried out. The results showed that there is a potential for the use of this type of coating.

Abstract: The effect of strain and the friction on the stress-strain state in the deformation zone during cold rolling of thin beryllium and aluminum foils was investigated in this work. Calculations showed that material hardening has a significant influence on the contact pressure distribution along the contact arc. Although it, the distributions of hydrostatic stress and stress triaxiality are favorable for fracture prevention both beryllium and aluminum except narrow regions near the entrance and the exit of deformation zone for all considered cases (strain up to 40%, friction coefficient in range 0.03 – 0.3). The most favorable stress state is observed during cold rolling with a high friction coefficient (rolling without lubrication).

Abstract: Proposed a method for measuring parameters of micro-surface machine parts optoelectronic and computer facilities, based on the computation of two-dimensional settings of the autocorrelation function, based on the binary image of the investigated microrelief using kvazioptimalnogo correlation algorithm. Found to be the most informative characterization of the studied surfaces, micro precision components reliably distinguished from each other with a given probability, is the average amplitude of the variable component of the autocorrelation function. Shows the results of determining the parameters of microrelief surface of runner blade GTM using quasi-optimal correlation algorithms.

Abstract: The article describes a new method for texture analysis of precision machined surfaces, which is based on the use of computer optics and an autocorrelation method for processing the obtained images of the textures of the studied microreliefs. The method is based on a probabilistic comparative assessment of the unknown texture of the studied microrelief with known textures of the reference microreliefs, for which the parameters of the microreliefs are predetermined according to the state standards of the Russian Federation.

Abstract: A finite element model was developed to determine the temperature distribution in the preheating phase of the friction surfacing (FS) process. In the present study consumable rod was used as a tool. As a model of the heat source, a model applicable to the traditional friction stir welding (FSW) was used. The developed model has been validated by a full-scale experiment. Temperature fields were obtained for different modes of the FS process, where the variable parameters were the axial force and the speed of rotation of the consumable rod. The difference between calculated and experimental data is less than 10%. Influence of the axial force magnitude on the consumable rod and the rod rotation speed on the temperature field generated by friction and plastic deformation of the consumable rod was established.

Abstract: The work is devoted to the study of the formation of protective and decorative coatings environmentally safe combined paint compositions. The considered work covers a range of issues related to colloidal-chemical modification of organo-soluble and water-dispersion lacquer compositions, development of their rational formulations and finishing modes, study of physical, mechanical and operational properties of protective coatings and ends with the calculation of the possible economic efficiency of the research results. In work environmentally safe water-dispersive paint and varnish compositions for transparent and opaque finishing by method of colloidal-chemical modification are developed. Optimal conditions for obtaining combined water-dispersion lacquer compositions of pigmented and non-pigmented and finishing modes are established. Modification of paint compositions with metal pigments allows to obtain a glazing coating, which significantly expands the color gamut of protective and decorative coatings.

Abstract: This Article Presents the Results of the Development of Multilayer Ceramic Coatings to Protect Metal Products from Corrosion in Aggressive Liquid Metal Environments. the Development is Based on the Integrated Use of Low-Temperature Heterophase Transfer and Microarc Oxidation Methods. the Results of Corrosion Tests of Coatings in the Interaction with Molten Lead in the Temperature Range of 400-600°C are Presented. the Structural Characteristics of the Coatings are Considered.

Abstract: Steam turbine blades in the process of operation are subjects on which the high mechanical loads, erosion, corrosive and vibration effects. These factors significantly reduce their service life, which forces to costly repair work. The application of heat and wear-resistant coating on the turbine blades is a rational way to increase the service life of the turbine.

Abstract: The article presents the results of research on the development of technology for the production of functional-gradient coatings with high levels of adhesive strength and hardness, as well as with low porosity. The coating was successfully tested and recommended to protect the elements and components of precision engineering.

Abstract: In the article, the authors examined the technological aspects of obtaining a functional alloy based on silver alloyed with chromium, zirconium, rhenium and rare earth elements (cerium, lanthanum, yttrium). A technology has been developed for producing powder from this alloy and nanostructured functional coatings based on it using the method of cold gas-dynamic spraying.