Special Features of Vacuum Carburizing of Heat-Resistant Steel in Acetylene

Ryzhov, N. M.; Смирнов, А. Е.; Fakhurtdinov, R. S.; Mulyakaev, L. M.; Gromov, V. I.

doi:10.1023/b:msat.0000043108.71523.08

Cited by 31 publications

(6 citation statements)

References 2 publications

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“…Полученные рентгенограммы расшифровывали с помощью базы порошковых дифракционных данных ICDD PCPDFWIN (1997 г.) по таблицам о межплоскостных расстояниях фаз, которые содержат элементы, входящие в состав образцов [6,7].…”

Section: ключевые словаunclassified

Specific Features of Forming Surface Phases under Chemical Heat Treatment of Iron-Base Alloys

Vintaikin¹,

Kamynin²,

Смирнов³

et al. 2018

HoBMSTU.SNS

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Section: ключевые словаunclassified

Specific Features of Forming Surface Phases under Chemical Heat Treatment of Iron-Base Alloys

Vintaikin¹,

Kamynin²,

Смирнов³

et al. 2018

HoBMSTU.SNS

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“…One of the fundamental aspects of the vacuum carburizing is homogenous distribution of carbon in the surface layer what is usually not achievable in the other -classical types of carburizing processes. The mathematical description of the process of gas distribution in a vacuum, confirms possibility to conduct carburizing in the way in which transported carbon is uniformly distributed over the cross section of the treated element [4,5,6]. Another important aspect of analysing of the structure subjected to vacuum carburizing is heat treatment applied in order to transform the austenite to martensite.…”

Section: Introductionmentioning

confidence: 99%

“…In standard industrial procedures, carburizing process of alloyed steels is realized in around 925°C. Increase of the temperature can changes the characteristic of carbon diffusion and gives potential for shortening the time and lowering the cost of the process [5]. Standard gas carburizing process with use of Endo (endothermic gas) atmosphere cannot be realized in higher temperature due to inhomogeneity of the carburizing layer obtained, however, vacuum process gives potential in this field.…”

Section: Introductionmentioning

confidence: 99%

Process Temperature Effect on Surface Layer of Vacuum Carburized Low-Alloy Steel Gears

Dychtoń

Rokicki

Nowotnik

et al. 2015

SSP

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Gears, due to their complex shape, carried load and required accuracy are ones of most complex aircraft engine parts. Single tooth damage usually breaks the power transmission and causes failure of the entire gear system. Adequate sustainability and guarantees of transmission is therefore a condition for secure operation of whole device. Particularly high requirements for reliability are put to transmissions used in the aerospace industry. Due to the loads which are transmitted through the gears, the materials used by the manufacturer must have not only high strength but also show the abrasion resistance of the surface layer and the ductility of the core. Thermo-chemical treatment of industrial gears is a fundamental process, which gives them adequate mechanical properties regarding loads they carry and the surface conditions of work. The most promising method in the discussed field is vacuum carburizing, which by its specification of work significantly reduce the emission of CO2and the duration of the process, without reducing the quality of the final product. The main aim of the paper is to present criteria for selection of carburizing parameters (mainly temperature increase) as a part of thermo-chemical treatment process performed using vacuum methods. Proper (higher to compare with conventional methods) carburizing process temperature is crucial in programming of carbon diffusion process meaning in process time and final carburized layer characteristics as carbon profile and homogeneity of the carburized layer.

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“…Most of them concern lowering toxic gases emission in the industrial processes, other lowering fuel consumption and noise by the engines [1]. Heat treatment and thermochemical treatment is one of the crucial technological processes of steels that are of great importance not only in the meaning of final element properties but also of social, environmental and economic importance [2,3,4]. Manufacturers of aircraft engine components all over the world fight with trends in the production to develop and apply newer and more advanced in the technological and innovative meaning treatment processes [4].…”

Section: Introductionmentioning

confidence: 99%

Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels

Rokicki

Dychtoń

2016

Archives of Metallurgy and Materials

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Carburizing is one of the most popular and wide used thermo-chemical treatment methods of surface modification of tool steels. It is a process based on carbon diffusive enrichment of the surface material and is applied for elements that are supposed to present higher hardness and wear resistance sustaining core ductility. Typical elements submitted to carburizing process are gears, shafts, pins and bearing elements. In the last years, more and more popular, especially in highly advanced treatment procedures used in the aerospace industry is vacuum carburizing. It is a process based on chemical treatment of the surface in lower pressure, providing much higher uniformity of carburized layer, lower process cost and much lesser negative impact on environment to compare with conventional carburizing methods, as for example gas carburizing in Endo atmosphere. Unfortunately, aerospace industry requires much more detailed description of the phenomena linked to this process method and the literature background shows lack of tests that could confirm fulfilment of all needed requirements and to understand the process itself in much deeper meaning. In the presented paper, authors focused their research on acetylene flow impact on carburized layer characteristic. This is one of the most crucial parameters concerning homogeneity and uniformity of carburized layer properties. That is why, specific process methodology have been planned based on different acetylene flow values, and the surface layer of the steel gears have been investigated in meaning to impact on any possible change in potential properties of the final product.

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Special Features of Vacuum Carburizing of Heat-Resistant Steel in Acetylene

Cited by 31 publications

References 2 publications

Specific Features of Forming Surface Phases under Chemical Heat Treatment of Iron-Base Alloys

Specific Features of Forming Surface Phases under Chemical Heat Treatment of Iron-Base Alloys

Process Temperature Effect on Surface Layer of Vacuum Carburized Low-Alloy Steel Gears

Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels

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