мікротвердість

Laser surface modification of materials

To develop any process of laser technology, you need to solve 3 problems: 1) What are the properties of the interaction of laser radiation with matter must be selected to achieve the goal (resonant – non-resonant, absorption-scattering, photo- or thermal absorption, heating, hardening, melting, softening, evaporation, decomposition, coagulation, etc.); 2) What type of laser source should be used to achieve this goal (wavelength, operation mode – continuous or pulse-frequency, power, pulse duration, transverse energy distribution in the beam, coherence

Differences of the effect of thermal treatment in an oxygen-containing gas medium on properties of the surface layer Ti, Zr, Hf

The paper presents the characteristics of the surface layer of d-elements of the IV group (titanium, zirconium and hafnium) after thermal diffusion saturation from a controlled oxygen-containing gas medium. Saturation was carried out at T = 750 °C for t = 5 hours at different pressures (P = 1.33∙10–1 Pa, P = 1.33∙10–2 Pa, P = 1.33∙10–3 Pa). Experimentally revealed differences in the characteristics of the surface layer of titanium, zirconium and hafnium.

Microstructure and microhardness of nickel-base heat-resistant alloys obtained by directional and equilibrium crystallization

In order to determine the safe operational life of the components of gas turbine engines (GTE), introductory tests of nickel-base heat-resistant alloys (NHRA) have been performed. X-ray fluorescence and X-ray diffraction analyzes, optical microscopy and Vickers hardness measurements provided data on the phase-structural state and mechanical properties of the pristine ZhS6K-VI and ZhS32-VI alloys obtained by equilibrium and high-speed directional crystallization, respectively.

Особливості хімічної стійкості та мікротвердості гартованого скла

Досліджено вплив гартування скла традиційним та новим контактним методом на величину мікротвердості та хімічної стійкості 6 мм листового флоат-скла. Виявлено, що присутність у склі залишкових напружень призводить до зменшення мікротвердості та хімічної стійкості, однак скло гартоване контактним методом є більш твердим та стійким до дії соляної кислоти, ніж скло гартоване повітрям. Встановлено, що причиною зниження хімічної стійкості та мікротвердості гартованого скла є утворений на поверхні скла шар із низькою густиною.

Optimization of Welding Modes for High-Strength Low-Alloy Domex 700 Steel

The microstructure and hardness of the weld joints of DOMEX 700 steel were investigated. As a result, the optimization of the parameters of robotic arc welding in the environment of protective gases was carried out taking into account the size of the energy per unit length. The optimum modes of welding were determined. The size of the deterioration area, where there is a decrease in hardness in comparison with the main metal, for a thickness of 6 mm is 2.36 mm, and for a thickness of 3 mm is 1.51 mm.

Perspectives of Method Atomic Force Microscopy for Research and State Physical and Mechanical Characteristics Precision Machinery Surface Products

This paper is the well-proven expediency of the use of method of atomic-force microscopy is at research of the state and superficial descriptions of surfaces of wares of precision engineer. Basic directions of researches of topogram, physics and mechanics descriptions of surfaces of wares of precision engineer and set limitations and defects are considered in using of its method for research of separate properties of surfaces of wares.

Мікротвердість поверхневих шарів гартованого склах

The value of microhardness of the surface layers of 6 mm float glass, tempered by contact and by air method by etching in a mixture of fluoride and sulfuric acids, is researched. It was established that the microhardness value depends on the method of tempering and thickness of the etched layer. The optimal parameters of the microhardness measure of 6 mm float glass are selected and thickness of the etched layer which causes the relaxation of residual tensions is indicated.

Залежність величини мікротвердості 6 мм листового флоат-скла від умов її визначення

The change of microhardness values of 6 mm float glass, depending on the measurement conditions were investigated. It was established that the value of microhardness depends on the surface moisture, the load on indentor and duration time. The optimal parameters of microhardness measurement of 6 mm float glass were chosen.