Science of materials and mechanical Engineering

Influence of Temperature-Temporal Pa¬rameters of Annealing on Structure and Mechanical Properties of Alloy АМг6л with Enhanced Maintenance of Silicon

In this paper we study the influence of temperature-temporal parameters of in-process annealing set on structure and mechanical properties of alloy АМг6л with 1 % of silicon admixtures. Melting is conducted in the laboratory resistance stove in graphite crucible. We use the following materials: aluminium А99, ligature Al–Mg, Al–Zr, Al Be, Al–Ti, Al–Si. The obtained standard samples 10 mm in diameter are annealed at different temperature-temporal parameters. Also, we determine their mechanical properties.

Algorithm for Solving Multicriteria Problem of Choice of Banknote Deterioration Characteristics Using the Utility Function

The utility functions of alternatives based on additive, multiplicative, additive-multiplicative and entropy convolutions of factors as well as metrics of Chebyshev, Euclid, Minkowski and the method of deviation from the sample have been formed taking into account separation of factors for stimulators and destimulators. The algorithm of the determination of alternatives' preferences was developed on base utility function. The developed algorithm is implemented for solving of multicriteria problem of choice the most accurate characteristic of deterioration for banknotes in real circulation.

Control of Bath Dynamics along Purging as Part of the Control System Converter Melting

The purpose of research is to lay the theoretical foundation and specify the control model of bath dynamics along the blowdown. The research is conducted on converters of 160 tons. Specifically, we study the control dynamics of decarbonization and changes of bath temperature. We use deterministic and statistical methods to process the research results.

Cyclic Character of the Microhardness Aluminium Alloy D16 under Ultrasonic Impact Treatment

The article studies possibilities of more effective surface hardening as compared with conventional thermo-mechanical processing. Specifically, we provide the insight into surface hardening of light structural alloys by ultrasonic impact treatment (UIT) in air under quasi-hydrostatic pressure of the sample.

Analysis of surfaces’ quality parameters of sliding bearings Made of composite alloys for printing machines at abrasive grinding

In the article we present the research results of defect layers formation on surfaces of sliding bearings made of new high-alloy composite alloys produced from tool steels wastes and intended for high-speed printing machines. We show that such quality parameters of surfaces like cold-work strengthening, depth of its bedding, and range of cold-work strengthening and distortions of the 2-nd type are formed as a result of interaction between force and temperature fields appearing on the top of abrasive grain at fine abrasive grinding of friction surfaces of sliding bearings.

Corrosion of Steel Gas Chromoaluminized 12Х18Н10T

This paper presents the research results of chrome-calorizing of the steel 12X18Н10T. We show how to obtain chromo-calorizing coatings on the surface of the steel 12X18H10T with titanium nitride. We coat the surface by combining two processes: physical 12X18H10T vapor deposition of titanium nitride and diffusion chromo-calorizing conducted by powder in containers with fusible closure under reduced pressure at a temperature of 1050 °C for 3 hours. We determine the phase and chemical composition, thickness and microhardness of coatings before and after the heat resistance test.

Creep of Nonlinearly-Viscoelastic Materials under Different Nonstationary Uniaxial Loading Regimes

This paper considers the problem of calculating creep strains of nonlinearly-viscoelastic material under different modes of nonstationary uniaxial loading. These modes involve stepped loading and unloading. Specifically, we solve the problem based on the hypothesis of the unified deformation diagram created from similarity of isochronous creep diagrams and a stress-strain diagram. A generalized reological model is constructed. Relying on this generalized model, we construct the unidimentional creep constitutive equations of nonlinear viscoelastic materilas.

Features of Detonation Products Equation during Numerical Modeling of a Home-Made Explosive Device

The computer simulation method belongs to new methods of forensic analysis of home-made explosive devices. The library of most computer programs well-known around the world, for example, ANSYS/AUTODYN, LS DYNA, comprises such items as state equations describing the behavior of the detonation products (DP) mainly explosives (HE) of foreign origin. In this case, the amount of explosives, whose numeric parameter constants are known, is limited. In addition, it is unknown what will be the constants values of these equations for home-made explosives. This paper describes L.P.

Modelling of The Large Strains. The Message 3. About Theoretical Bases of Use of a Logarithmic Measure of Strains of Hencky

This paper represents the comprehensive data on theoretical foundations of applying logarithmic measure of Hencky deformation for deformation modelling with various types of large deformations: thermal, elastic, plastic and creep. We consider the properties of the logarithmic deformation (Hencky) for the fiber of materials. We use basic measures of stresses and the second law of thermodynamics as auxiliary information. Crucially, we define the law of elastic deformation (for an isotropic material) using Hencky strains – the stress measure corresponding to Hencky strains.

Influence of Annealing Conditions on Structure and Magnetic Properties of Nanodimensional Fe50Pt50(15 nm)/ Ag(30 nm)/Fe50Pt50(15 nm)/SiO2(100 nm)/Si(001) Film Composition

We study the influence of 30-nm-thick Ag intermediate layer and annealing duration in a vacuum at the temperature of 600 °С on formation of chemically ordered L10(FePt) phase in nanodimensional film composition (NFC) of Fe50Pt50(15 nm)/Ag(30 nm) /Fe50Pt50(15 nm) on planar SiO2(100 nm)/Si(001) substrate.