Hydrogen is one of the most widespread chemical elements in the nature. Molecular hydrogen reacts with a few chemical elements but when hydrogen becomes a radical it interacts with a lot of elements. Metal saturation with hydrogen leads to hydrogen absorption and destruction. The paper presents chronology and essence of processes pertaining to mechanism of hydrogen absorption, hydrogen wear and metal destruction that have been obtained on the basis of the scientific investigation and experimental data analysis.
Hydrogen is one of the most widespread chemical elements in the nature. Molecular hydrogen reacts with a few chemical elements but when hydrogen becomes a radical it interacts with a lot of elements. Metal saturation with hydrogen leads to hydrogen absorption and destruction. The paper presents chronology and essence of processes pertaining to mechanism of hydrogen absorption , hydrogen wear and metal destruction that have been obtained on the basis of the scientific investigation and experimental data analysis.
The paper presents methods for obtaining qualitative metallic surfaces by electric arc welding deposition while using consumable electrode in a protective gas medium and executing regularized drop transfer of electrode metal. The drop transfer efficiency of electrode metal and productivity of welding deposition are significantly increased due to excitation of lateral vibrations in the consumable electrode with preset amplitude. The paper describes a method and a device for welding deposition of metallic surfaces by vibrating electrode where vibrations are excited by ultrasound.
The paper provides an analysis of ultrasonic surface plastic deformation and subsequent laser thermal strengthening of gray cast iron parts in the regime of hardening from a solid state with the purpose to obtain strengthened surface layers of bigger depth and less roughness of the processed surface. Program complex ANSYS 11.0 has been used for calculation of temperature fields induced by laser exposure. The appropriate regime of laser processing without surface fusion has been selected on the basis of the applied complex. The possibility of displacement in the bottom boundary of α–γ-transformation temperature for СЧ20 with 900 °С up to 800 °С is confirmed due to preliminary ultrasonic surface plastic deformation of the surface that allows to expand technological opportunities of laser quenching of gray cast iron from a solid state.
The paper provides an analysis of ultrasonic surface plastic deformation and subsequent laser thermal strengthening of gray cast iron parts in the regime of hardening from a solid state with the purpose to obtain strengthened surface layers of bigger depth and less roughness of the processed surface. Program complex ANSYS 11.0 has been used for calculation of temperature fields induced by laser exposure. The appropriate regime of laser processing without surface fusion has been selected on the basis of the applied complex. The possibility of displacement in the bottom boundary of α–γ-transformation temperature for СЧ20 with 900 °С up to 800 °С is confirmed due to preliminary ultrasonic surface plastic deformation of the surface that allows to expand technological opportunities of laser quenching of gray cast iron from a solid state.
The paper presents methods for obtaining qualitative metallic surfaces by electric arc welding deposition while using consumable electrode in a protective gas medium and executing regularized drop transfer of electrode metal. The drop transfer efficiency of electrode metal and productivity of welding deposition are significantly increased due to excitation of lateral vibrations in the consumable electrode with preset amplitude. The paper describes a method and a device for welding deposition of metallic surfaces by vibrating electrode where vibrations are excited by ultrasound.
Formation processes, tribotechnical and wear-resistant properties of composite gas thermal coatings being dispersively strengthened by synthetic diamonds and electro-corundum are investigated in the paper.
SPIRIDONOV NV, SOKOROV IO, PILETSKAYA LI, DOMASH EV, BUZUN, E.L. Requirements for gas-thermal coatings when using Concentrated energy flows
Formation processes, tribotechnical and wear-resistant properties of composite gas thermal coatings being dispersively strengthened by synthetic diamonds and electro-corundum are investigated in the paper.
The paper investigates influence of magnetic–electric grinding parameters on surface micro-relief formation. It has been established that while changing values of technological current and magnetic density parameters, it is possible to control qualitative characteristics of a work-hardening coating.
The paper investigates influence of magnetic–electric grinding parameters on surface micro-relief formation. It has been established that while changing values of technological current and magnetic density parameters, it is possible to control qualitative characteristics of a work-hardening coating.
The paper investigates influence of magnetic and electric grinding parameters on formation of physical and mechanical properties of protective coatings. It has been established that it is possible to control chemical composition, properties and qualitative characteristics of hardening coatings while changing technological process parameters.
The paper investigates influence of magnetic and electric grinding parameters on formation of physical and mechanical properties of protective coatings. It has been established that it is possible to control chemical composition, properties and qualitative characteristics of hardening coatings while changing technological process parameters.
Influence of technological modes of magnetic-electric grinding on structural changes in a surface layer of gas-thermal sprayed coatings is investigated in the paper. The paper presents optimum modes of coating roughing and finishing processes.
Machining using abrasive particle flow with the help of special machine-tool attachments designed with an application of mathematical modeling is applied for mechanization and provision of equal cleaning of small diameter surfaces with rather complicated accessibility.
The paper reveals thermal zones of magnetic and electric grinding process. The influence of electric and physical parameters of magnetic and electric grinding on temperature in the zone of gas and thermal protective coatings has been established in the paper.
The paper contains research pertaining to laser thermohardening processes of high-strength ВЧ-50 cast iron and grey СЧ-20 cast iron with reference to a problem concerning an increase of wear resistance and operational properties of tractor «Belarus» brake mechanisms.
