Remelting effect on the properties of heat-resistant alloy in liquid state

Tyagunov, Andrey; Baryshev, E. E.; Tyagunov, G. V.; Mushnikov, V. S.

doi:10.17580/tsm.2018.04.10

tsm

2018

DOI: 10.17580/tsm.2018.04.10

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Remelting effect on the properties of heat-resistant alloy in liquid state

Andrey Tyagunov¹,

E. E. Baryshev²,

G. V. Tyagunov³

et al.

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Cited by 5 publications

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“…Normal magnetic properties corresponding to the normative and technical documentation can be achieved by smelting in open furnaces. To obtain alloys with better and high magnetic properties vacuum units and smelting processes are used [1][2][3][4].Distinctive features of soft magnetic alloys are their high magnetic permeability, low coercive force, ability to be treated by plastic deformation, and higher specific electrical resistivity.Such indicators are achieved by adding nickel, cobalt, chromium, manganese, molybdenum, silicon and other elements to the alloys composition. Along with smelting processes hard metal heat treatment is very important [5].…”

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“…This influences on the course of such processes as diffusion, crystallization and then phase transformations and distribution of atoms in cast and deformed metal [1]. Numerous experimental studies revealed the following pattern: the higher the degree of the smelt equilibrium is before solidification, the better the quality parameters of the hard metal are [1][2][3][4].…”

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confidence: 99%

“…Modes of such technology are developed on the basis of data on structure-sensitive properties of smelts and solid metal quality indicators [1,[3][4].…”

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Production feature of soft magnetic amorphous alloys

Tyagunov

Baryshev

Shmakova

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Methods for making nanocrystalline alloys have been discussed. Temperature dependences of the surface tension (σ), electric resistivity (ρ), magnetic susceptibility (χ) and kinematic viscosity (ν) have been obtained. Comparison of the properties of amorphous ribbons obtained by the pilot and serial technologies has been conducted. Science-based technology of multi-component alloy smelting makes it possible to prepare equilibrium smelt, the structure of which has a significant effect on the properties of the amorphous ribbon before spinning and kinetics of its crystallization has been offered.Introduction. Soft magnetic iron-nickel, iron-cobalt, iron-chromium and other high alloys have special physical and physicochemical characteristics. They are determined not only by an exact chemical composition, but also by factors of their production. Normal magnetic properties corresponding to the normative and technical documentation can be achieved by smelting in open furnaces. To obtain alloys with better and high magnetic properties vacuum units and smelting processes are used [1][2][3][4].Distinctive features of soft magnetic alloys are their high magnetic permeability, low coercive force, ability to be treated by plastic deformation, and higher specific electrical resistivity.Such indicators are achieved by adding nickel, cobalt, chromium, manganese, molybdenum, silicon and other elements to the alloys composition. Along with smelting processes hard metal heat treatment is very important [5]. However, structural features of steels and alloys which above all are determined by the selectivity of hardening phases and accompanied by the segregation of elements have a considerable influence on the properties of metal products. Main part. The production of nanocrystalline materials with particle size from 1 to 10 nm and soft magnetic amorphous alloys improved special characteristics of products considerably.The easiest method to obtain nanocrystalline powders is to evaporate material at a controlled temperature either under inert gas with subsequent condensation of steam or in the reaction zone with the formation of spherical particles, or on surfaces, where particles have faceting.A plasma-chemical method of obtaining nanopowders is the most common chemical methods among others. The reaction is carried out in non-equilibrium conditions providing for a high rate of nucleus formation of the new phase and a low speed of their growth.A nanoparticle deposition in colloidal solutions involves the consistent implementation of the following operations: a synthesis of starting reagents of the solution and a reaction termination at a particular point in time, after which the disperse system changes from a liquid colloidal state into a dispersed solid one. The method has high selectivity and allows producing particles with a very narrow size distribution.

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mentioning

confidence: 99%

mentioning

confidence: 99%

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Production feature of soft magnetic amorphous alloys

Tyagunov

Baryshev

Shmakova

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Technology of castings restoration by casting alloyed thermite melt onto the surface

Saithareiev,

Skidin,

Ponomarenko

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The study describes the process of forming a functional layer of thermite melts on the surface of castings. The chemical composition of thermite mixtures, technological parameters of various processes of surface alloying of castings, structure and mechanical properties of alloys, and operational properties of castings were examined at various stages of the development of energy-efficient technology for creating a functional surface of a given thickness. The described technology of surface alloying of castings by obtaining functional layers from thermite melts refers to the aluminium-thermite method of obtaining a melt with its subsequent casting on the surface of castings to form a wear-resistant functional layer or direct casting of castings. Characteristic features of the technology are: the use of cheaper internal chemical energy of the interaction of reagents to produce melts, instead of external electrical energy; simplicity and cheapness of the equipment used; obtaining various grades of alloys; high speed of processes in metal synthesis; high productivity of the process of manufacturing or repairing castings.

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Computerized testing as efficient form of objective knowledge monitoring in studying of technical subjects

Kuznetsov

Polekhina

Shaposhnikova

2019

Stroitel’stvo: nauka i obrazovanie

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Introduction. Objective and regular students’ knowledge monitoring in technical subjects can be implemented by means of special tests allowing for the required mastering level of the matter and the reliable consolidation of the acquired knowledge. Various aspects of the application of tests in the academic activity were considered. Materials and methods. Tests used in practical studies should meet specific requirements, such as: validity, definiteness, simplicity, unambiguity, reliability. The identification of mastering levels makes it possible to “troubleshoot” and to improve the academic activity and the mastering degree of the competences by the students. Based on the assessment of the studying pattern of the forthcoming activity, one could point out four mastering levels of the subject matter. Level I tests include recognition, discrimination and classification. Level II tests monitor the mastering of the subject in the level of “reproduction” allowing for retrieval of information from the memory and its analysis, for routine assignment solutions. Level III tests impose special assignments challenging a student with quests for which no ready algorithms are catered, whereas the solutions found lead to obtaining of subjectively new information. Level IV tests reveal students’ capability to take decisions in new problematic situations, the solutions found, being a result of creative activity, are followed by obtaining of objectively new information. Results. To establish an efficient system of monitoring tests in a certain subject, a number of basic prerequisites is required, such as a data base, a sample group of with the required number of assignments, at least 30 and maximum 70, a time limit in accordance with the required labor intensity, assessment of the assignments and its criteria, the output of the results. Conclusions. If there is a required number of computers of at least one PC per two students, correctly arranged computer testing considerably reduces time demand of a monitoring event, increases the responsibility and the progress of the students, guarantees the objectiveness of the knowledge monitoring and helps to avoid conflicts.

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Remelting effect on the properties of heat-resistant alloy in liquid state

Cited by 5 publications

References 0 publications

Production feature of soft magnetic amorphous alloys

Production feature of soft magnetic amorphous alloys

Technology of castings restoration by casting alloyed thermite melt onto the surface

Computerized testing as efficient form of objective knowledge monitoring in studying of technical subjects

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