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Scientific and Practical Commentary on Specialists’ Professional Standards in Thermal
Engineering Education # 04, April 2016
DOI: 10.7463/0416.0837485
This article presents a scientific and practical commentary to the Russian official professional standards for specialists in installation and testing of thermal equipment; analysis and diagnosis of the technological complexes for thermal treatment; automation and mechanization of the processes of thermal manufacturing. The norms for classifying of the professional engagements and skill levels of these specialists according to the technical difficulty of thermal and thermo chemical equipment and corresponding technological processes were clarified. The concrete examples are represented. The necessity to ensure a high level of professional training of specialists in these areas is shown.Key wards: professional standards; thermal equipment; technological processes; technical difficulty; levels of professional skills.

Engineering Bulletin # 12, December 2015
УДК: 621.785.5
The application of vacuum heat and thermo-chemical treatment to improve strength of different heavily loaded machine parts and engineering instruments
Engineering Education # 02, February 2014
DOI: 10.7463/0214.0700036
The paper presents great technological capabilities of vacuum heat and thermo-chemical treatment provided by the universal equipment, which enables us to strengthen different heavily loaded machine parts and engineering instruments. A load-bearing capacity of the treated part is defined by the diffusion layer saturation, the structure of surficial region and heart. Technological factors of treatment processes with complicated mechanisms to influence on the resulting features make it reasonable to design the strengthening operating conditions using the calculation methods.
Influence of ion nitriding and vacuum carburizing on wear resistance of VKS-7 and VKS-10 steels
Engineering Education # 06, June 2013
DOI: 10.7463/0613.0579264
Significant resources for improving the set of performance characteristics of essential machine parts are gathered in development of new technologies of thermal and thermochemical treatment, based on activation of processes of diffusion saturation and providing volumetric and surface ultra-finely-divided or nanostructured condition of constructional materials. Results of estimating wear resistance and micro-hardness of VKS-7 and VKS-10 steels after complex treatment, including two stages: 1 - preliminary plastic deformation by a warm compression method and 2 - ion nitriding or vacuum carburizing were presented. A conclusion on the correlation between hardness and wear resistance was drawn.
Mathematical model of vacuum nitrocarburizing of the complex-alloyed VKS-10 steel
Engineering Education # 08, August 2013
DOI: 10.7463/0813.0569132
This paper presents a mathematical model of a co-saturating complex alloy steel with carbon and nitrogen in the low pressure atmosphere. They developed software that gave an opportunity to estimate concentration curves of carbon, nitrogen, and basic alloying elements for VKS-10 steel, as well as the main characteristics of the phase composition in tabular and graphical forms on the basis of the parameters of vacuum nitrocarburizing. The effect of the complex chemical composition of the steel on formation of the diffusion layer was taken into account. Sufficient adequacy of the model within the temperature range from 880 to 940 ° C was demonstrated; these temperatures are the same as during high-temperature nitrocarburizing. With the help of this mathematical model patterns of formation of diffusion layers depending on technological factors of vacuum nitrocarburizing were investigated.
Investigation of durability of VKS-7 and VKS-10 steels after vacuum carbonization and vacuum carbonitriding
Engineering Education # 05, May 2013
DOI: 10.7463/0513.0568124
Development of new technologies of thermal and thermochemical treatment, based on the activation of cementation processes and which could provide volume and surface finely-divided or nanostructured state of constructional materials appeared to be a very powerful method to increase the durability of critical machine elements. Results of estimating the durability and micro-hardness of VKS -7 and VKS-10 steels were presented in this article after complex processing which consisted of two stages: 1 – preliminary plastic deformation by means of warm shortening and 2- plasma nitration or vacuum carbonization. Analysis of the relation between hardness and durability was carried out.
Kinetics of carbon and nitrogen mass transfer in ionized atmospheres
Engineering Education # 09, September 2012
DOI: 10.7463/0912.0452489
The regression dependence of the carbon and nitrogen potential on the acetylene temperature and concentration at saturation of iron and complex-alloy steels in glow discharge plasma was determined. The defining influence of the adsorption rate of acetylene molecules on the intensity of carbon mass transfer was revealed. The most probable reaction of acetylene dissociation was determined according to the analysis of experimental data, thermodynamic calculations and the structure of the acetylene molecule. The influence of the solid solution and the reaction mechanisms of saturation on the mass transfer kinetics of carbon during ion carburizing were described.
77-30569/330997 Optimization of technology factors of complex-alloyed steel vacuum nitrocarburizing
Engineering Education # 03, March 2012
An experimental study of carbon and nitrogen saturation of complex-alloyed steel in low-pressure atmosphere was conducted. After the process of vacuum nitrocarburizing the quantity of austenite was increased. Also the dimensions of carbonitride particles were decreased. The control factors of vacuum nitrocarburizing technology were optimized with use of a mathematical model.
 
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