THE RESEARCH OF METHODS OF SURFACE STRENGTHENING OF CONSTRUCTIVE ELEMENTS SURFACES

S. K. Meshchaninov, S. I. Makarchuk, R. V. Voloshin

Abstract


Currently, the solving of problems of increasing the reliability, economical efficiency and resources of manufacturing parts and joints of machines, aggregates and responsible structures requires the use of materials capable to operate in various aggressive environments, in conditions of temperature and pressure drop, increased vibrations, with variable contact, shock, static loads, etc. are very relevant and timely. Many product parameters determine the state of the surface layer of the material from which it is made.

It is known that the losses connected with the failure of machines and other equipment due to the wear and tear of certain details are huge [1]. At the same time, it is obvious that the use of scarce and expensive construction materials in the whole range is expedient. There is a large number of traditional quenching methods that have their own peculiarities, advantages and disadvantages. In this regard, the purpose of this work was to conduct a comparative analysis of existing methods of surface hardening of machine details.

The main distinguishing feature of the methods of surface hardening by highly concentrated sources of heating is the possibility of obtaining the heating and cooling rates of materials that excel the indexes by several orders are typical for traditional methods of streng-thening. It helps to obtain strengthened layers with previously unattainable level of operational properties.

In the course of numerous studies it was established that the rate of cooling of the surface metal layer, the structure and properties of the strengthened zone are determined prima-rily by the degree of localization of the insertion of heat into the treated product (in the spot of heating). The most important factors for practice depend from this: the magnitude of residual stresses and deformations, the necessity for additional cooling media, the processing productivity, technical and economic indexes.


Keywords


surface strengthening; heating source; gas flame; electric arc; plasma stream; quenching by dipping; gas flaming temper; cementation of nitriding

References


Балановский А.Е. Плазменное поверхностное упрочнение металлов. Иркутск: ИрГТУ, 2006. 180с.

Степанова Т.Ю. Технологии поверхностного упрочнения деталей машин: учеб. пособ. Иваново: Иван. гос. хим.-технол. ун-т., 2009. 64с.

Лещинский Л.К., Самотугин С.С., Пирч И.И., Комар В.И. Плазменное поверхностное упрочнение. Киев: Техника, 1990. 109с.




DOI: https://doi.org/10.31319/2519-2884.33.2018.194

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Copyright (c) 2019 S. K. Meshchaninov, S. I. Makarchuk, R. V. Voloshin

ISSN (print) 2519-2884

ISSN (online) 2617-8389