Metal Science and Heat Treatment

Puchkov, Yu.; Anan'ev, V.; Larkin, V.; Berezina, S.

doi: 10.1007/BF02468245pmid: N/A

Amorphous and nanocrystalline chronium-carbon coatings have higher properties than standard galvanic chromium ones. However, data on these coatings, and their heat-treatment regimes are quite scarce. The present paper concerns the structure, microhardness, ductility, adhesion strength, and resistance to overall and pitting corrosion of amorphous chromium-carbon coatings deposited galvanically by various regimes in an electrolyte based on chromic anhydride with an additive of formic acid.

Safonov, A.; Aleksenko, S.

doi: 10.1007/BF02468246pmid: N/A

It is known that laser hardening increases the wear resistance of friction parts quite substantially. At the same time, many problems connected with the effect of the treatment process and the special features of laser hardening on the characteristics of wear resistance require detailed consideration. The present paper is devoted to the development of recommendations on choosing the optimum location and proportion of the areas of the hardened and unhardened regions of the surface of structural steels after their treatment with radiation of a continuous CO2 laser.

Simonov, V.; Khasyanov, M.

doi: 10.1007/BF02468247pmid: N/A

Mechanochemical heat treatment (MCHT) is a new direction in the creation of protective coatings with a controlled micro- and macrostructure. The use of MCHT provides diffusion coatings with an anomalously large thickness and a structure that is most favorable for the operating conditions. Results of a study of high-temperature aluminide coatings on nickel deposited by an MCHT method are presented.

Abdyukhanov, I.; Prusakov, B.; Gorelik, V.; Plotnichenko, V.

doi: 10.1007/BF02468248pmid: N/A

The photoelectric method of converting solar energy is a promising and environmentally safe way of producing electric power. Sunlight can be converted into electric power by means of solar cells. The present paper concerns a study of polycrystalline silicon plates for the production of solar cells in the initial state and after heat treatment.

Ksenofontov, A.; Shevchenko, S.

doi: 10.1007/BF02468249pmid: N/A

Numerous criteria have been suggested for evaluating the cooling capacity of quenching media. Although the cooling capacity of a medium can hardly be evaluated by a single number, such data can be helpful in the initial stage of choosing the medium for quenching a specific part. Various criteria for evaluating the cooling capacity of polymer quenching media have been analyzed within the developed international standard based on ISO 9950 (for industrial quenchants). Those that can be calculated from results of tests of a medium by means of a Wolfson gauge, recommended by the ISO 9950 standard, have been chosen. The aim of the present work consists in determining the correlation between the criteria suggested by various researchers for various domestic and foreign quenching liquids on a polymer base.

Lesnikov, V.; Kuznetsov, V.; Goroshenko, Yu.; Repina, O.; Rozhko, A.

doi: 10.1007/BF02468250pmid: N/A

Protective coatings on parts made of high-temperature nickel alloys increase substantially their service life and resistance to oxidation and corrosion in a high-temperature gas medium. A promising direction in this respect is the use of a gas circulation method for depositing protective coatings that envisages separated positioning of the saturated alloy and the saturating powder containing chromium, aluminum, cobalt, and other elements. Transfer of these elements to the surface of the saturated alloy occurs by means of forced circulation of the gas phase in the closed volume of the installation at a specified temperature. The present work is devoted to the problem of diffusion saturation of the surface of nickel alloys of the ZhS type with Cr and Al by the gas circulation method.

Tarasov, A.

doi: 10.1007/BF02468251pmid: N/A

The use of carburized high-chromium steels with 13–18% Cr for the production of wear-resistant shaping tools and attachments is advantageous for many branches of industry. At the same time, the deposition of carbide diffusion layers on corrosion-resistant high-chromium steels has some special features and technological difficulties, specifically, in quenching, tempering, and polishing of parts and tools. The results described in the present paper and the developed technology of vacuum chemical heat treatment (VCHT), namely, cyanidation of steel 20Kh13 in an active carburizer based on ethanolamines, are of interest for the production of small-size tools and attachments in tool shops of enterprises producing instruments, electronics, watches and clocks, etc.

Starostin, V.; Pytyaeva, E.; Pershina, V.

doi: 10.1007/BF02468252pmid: N/A

Castings of high-strength iron are use very widely. The range of automobile parts cast from iron with globular graphite is widening. It includes crankshafts and camshafts, flywheels, crankcases, various engine parts, etc. In order to increase hardness of the surface layer, the wear resistance, and the service life of parts made of high-strength cast iron, they are often subjected to nitriding. The present work is aimed at studying the nitriding process for parts made of VCh70 and VCh85 high-strength cast iron.