Moscow, Russia


Moscow, Russia
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Kaputkina L.M.,National Research Technological University iS | Medvedev M.G.,OAO NPO TsNIITMASh | Prokoshkina V.G.,National Research Technological University iS | Smarygina I.V.,National Research Technological University iS | Svyazhin A.G.,National Research Technological University iS
Steel in Translation | Year: 2014

The strengthening and change in austenite stability when steel of X18H10 type alloyed by nitrogen are investigated, for applications where corrosion-resistant structural steel must operate satisfactorily at both high and cryogenic temperatures. Alloying by nitrogen may be regarded as a promising means of increasing the strength and stability of austenitic stainless steel. Preliminary cold or hot working increases the likelihood of martensite formation under load and consequently limits the working temperature range of the steel. High-strength nonmagnetic nitrogen steel based on X18AH10 steel with up to 0.22% N may be used for undeformable components at cryogenic temperatures. Without nitrogen, deformational martensite is always formed in such steel at temperatures below −70°C. High strength, plasticity, and ductility may only be ensured in such steel by means of the TRIP effect or reduction in the grain size. Nitrogen effectively strengthens the solid solution in the high-temperature state. The use of combined high-temperature deformation and moderate-temperature deformation permits additional strengthening of the steel during thermomechanical treatment, including strain aging, which is effective where thermostable steel is required. © 2014, Allerton Press, Inc.

Kolpishon E.Y.,OAO NPO TsNIITMASh | Nazaratin V.V.,OAO NPO TsNIITMASh | Tarasov N.I.,ZAO NPF TsKBA | Semenova E.V.,ZAO NPF TsKBA | And 4 more authors.
Russian Metallurgy (Metally) | Year: 2012

The technology of OAO Izhorskie Zavody and OOO OMZ Liteinoe Proizvodstvo of OMZ Corporation for the production of 20GML steel castings is described. Quality analysis of cast pipeline parts is performed. © 2013 Pleiades Publishing, Ltd.

Steel in Translation | Year: 2013

At nuclear power plants, metal equipment is subjected to temperatures of 290-320°C. That may lead to thermal aging and reduce the resistance to brittle failure. The degradation of the steel's properties may be taken into account in terms of the shift in the critical brittleness temperature. The thermal aging of steel is controlled by the diffusion of carbon and associated with carbide deposition. The results permit prediction of the properties of steel and the shift in the critical brittleness temperature corresponding to a life of 60 years. © 2013 Allerton Press, Inc.

Kartashev V.G.,National Research University | Kachanov V.K.,National Research University | Sokolov I.V.,National Research University | Shalimova E.V.,National Research University | And 2 more authors.
Russian Journal of Nondestructive Testing | Year: 2015

It is shown that during ultrasonic control of products that are made of materials with a complex structure (cast iron, concrete, and bronze) the use of ultrasonic signals with a wavelength that is comparable to the sizes of the acoustic irregularities in a material induces the combined reflection of an ultrasonic probing signal from structural irregularities, which masks the reflections from the initial defects of the product. The combined reflected signal is correlated with the probing signal; in ultrasonic defectoscopy of products it has to be considered as interference that masks the echo signals from the initial defects of the product. At the same time, it provides information on the structural state of a studied material. In this work we consider the model of a complex material with a random structural irregularity distribution, for which the statistical characteristics of the combined reflected signal, viz., the density of the structural-noise probability, dispersion, and energy spectrum, are determined. We propose a new method for defining the structural state of a complex material by analyzing the statistical characteristics (energy spectrum and dispersion) of the structural noise. The experimental results on the analysis of the statistical characteristics of the structural noise are discussed for cast-iron products, allowing the structural state to be detected and monitored during their operation. © 2015, Pleiades Publishing, Ltd.

Skorobogatykh V.N.,OAO NPO TsNIITmash | Shchenkova I.A.,OAO NPO TsNIITmash | Tugolukov E.A.,OAO em alYans
Thermal Engineering (English translation of Teploenergetika) | Year: 2010

Results obtained from studies of long-term strength and structural features of homogeneous and welded connections of chromium steel are presented. Information is also given on the new Grade 10Kh9V2MFBR steel developed for the piping systems of power units designed for ultrasupercritical steam conditions. © Pleiades Publishing, Inc., 2010.

Dub V.S.,OAO NPO TsNIITMASh | Levkov L.Y.,OAO NPO TsNIITMASh | Shurygin D.A.,OAO NPO TsNIITMASh | Kriger Y.N.,OAO NPO TsNIITMASh | And 3 more authors.
Russian Metallurgy (Metally) | Year: 2015

The manufacture of hollow ingots by electroslag melting is a promising trend in producing high-quality important products for and thermal and nuclear power engineering, petrochemistry, machine building, and some other industries. The prerequisites of development and challenging problems in this field are considered. The results obtained by Russian enterprises are presented. © 2015, Pleiades Publishing, Ltd.

Inorganic Materials | Year: 2015

Using the finite element method, the analysis of influence of errors in pitch during the thread production on the behavior of stress distribution in stud-nut joints is performed. The value of maximum local stresses in studs of a threaded joint is shown to substantially depend on errors in thread pitch of a stud and a nut. On the basis of the analyses of stresses and strains under cyclic loading, fatigue curves are plotted for the threaded joints having deviations in thread pitch. It is shown that, with a rational selection of the deviation in pitch, the cyclic strength of threaded joints can be considerably increased. The results of analysis agree satisfactorily with the data of fatigue tests of the M39 × 3 threaded joints. © Pleiades Publishing, Ltd., 2015.

Kozlov P.A.,OAO NPO TsNIITMASh | Dub V.A.,OAO NPO TsNIITMASh | Skorobogatykh V.N.,OAO NPO TsNIITMASh | Shchenkova I.A.,OAO NPO TsNIITMASh
Russian Metallurgy (Metally) | Year: 2012

The results of studying the influence of the heat treatment conditions on the structure and properties of new nanostructured steel with 8-10% Cr designed for heat power units with supercritical parameters are presented. © 2012 Pleiades Publishing, Ltd.

Dub A.V.,OAO NPO TsNIITMash | Skorobogatykh V.N.,OAO NPO TsNIITMash
Thermal Engineering (English translation of Teploenergetika) | Year: 2012

Results from a study of heat-resistant chromium steels intended for making high-temperature components of prospective thermal power equipment are presented. It is shown that the developments of new materials that have been implemented in the Russian industry create the necessary background for constructing thermal power units for a temperature of up to 620°C. © Pleiades Publishing, Inc., 2012.

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