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1.
I. A. Afanas’ev M. V. Kostina E. V. Blinov I. O. Bannykh Yu. A. Bondarenko 《Russian Metallurgy (Metally)》2007,(3):209-213
The structure and properties of an austenitic high-nitrogen corrosion-resistant 05Kh22AG15N8M2F cast steel produced by high-gradient directional solidification (HGDS) and equiaxed-grain solidification (ES) have been studied and compared. In contrast to ES, HGDS allows one to substantially decrease the degree of dendritic segregation of alloying elements, to eliminate porosity, and to increase the strength and plasticity of the steel. 相似文献
2.
V. M. Blinov A. V. Elistratov A. G. Kolesnikov A. G. Rakhshtadt A. I. Plokhikh E. I. Morozova M. V. Kostina 《Metal Science and Heat Treatment》2000,42(6):221-225
Conclusions
Translated from Metallovedenie i Termicheskaya Obrabotka metallov, No. 6, pp. 19–24, June, 2000. 相似文献
1. | We established the dependences of the phase composition of high-chromium (18% Cr) steels on the content of nitrogen. As the nitrogen content increases from 0.4 to 1.2% the proportion of untransformed austenite increases and that of martensite decreases respectively. This changes the structural class of the steels from martensitic (at 0.4% N) to austenitic (at 1.2%). |
2. | In heating of a quenched steel with 18% Cr and 0.4–1.2% N we determined two temperature ranges of structural transformations that correspond to the segregation of chromium nitrides from the initial martensite (A s−A f) and from austenite (B s−B f). |
3. | With the growth in the chromium concentration from 15 to 24% at 1–1.3% N quenching yields a stable austenite structure preserved even after tempering at 700°C. After heating the quenched steel to a temperature corresponding to the pointB f, the segregation of nitrides from the austenite causes the formation of martensite upon cooling and hence the growth in hardness. |
4. | Tempering of steels with an initial structure of martensite or austenite + martensite is accompanied with growth in the hardness due to dispersion hardening of martensite. The hardening is maximum (650–690HV) at a tempering temperature of 500–600°C. The highest level of hardening (649HV) has been observed in steel Kh18A4 quenched from 1200°C and tempered at 600°C. |
3.
Julia Kostina Galina Bondarenko Maria Gringolts Alexander Rodionov Olga Rusakova Alexander Alentiev Alexander Yakimanskii Yulia Bogdanova Vladimir Gerasimov 《Polymer International》2013,62(11):1566-1574
One of the most important areas of current research is the study of the influence of the prehistory of samples of amorphous glassy polymers on their physical and chemical properties. The study of structural changes by high temperature IR spectroscopy compared with of quantum chemical calculations allows for an understanding of the mechanism and nature of such processes. The changes in the structure of the polymer chain depending on the type of solvent used in the formation of the films are demonstrated using the examples of several different classes of polymers. In turn, the impact of such changes in the structure on the physical and chemical properties of the polymer films is demonstrated. © 2013 Society of Chemical Industry 相似文献
4.
5.
S. V. Mamyachenkov O. S. Anisimova D. A. Kostina 《Russian Journal of Non-Ferrous Metals》2017,58(3):212-217
Disadvantages of the sulfide method of purifying washing waters of the sulfuric-acid production are the formation of finely dispersed (particle size from 0.3 to 1.5 μm) difficult-to-filter precipitates of arsenic(III) sulfide and the danger of isolation of hydrogen sulfide into the atmosphere upon an overdose of sodium hydrosulfide. The coagulation of sols of arsenic sulfide is investigated in order to develop more efficient and rapid filtration technology of the precipitate. The filtration rate in various supply modes of sodium hydrosulfide and the dependence of settling rate and filtration on the presence of coagulants such as iron sulfate and aluminum sulfate are determined. It is established that the implementation of the distributed supply of sodium hydrosulfide during the precipitation of arsenic sulfide in combination with the application of such inorganic coagulant as iron(III) sulfate will make it possible to increase the particle size of the As2S3 phase by a factor of several times and increase the filtration and settling rates of pulps. 相似文献
6.
V. M. Blinov O. A. Bannykh M. V. Kostina I. A. Afanas’ev E. V. Blinov 《Russian Metallurgy (Metally)》2007,(6):492-498
Wear-resistance sliding-friction tests of high-strength corrosion-resistant nitrogen-bearing 08Kh14AN4MDB and 05Kh22AG15N8M2F steels have been performed for different structural states under sliding-friction conditions. The wear resistance of these steels depends on the intensity of the strain hardening of austenite. The martensitic-austenitic 08Kh14AN4MDB steel has a higher wear resistance if it has a high nitrogen-austenite concentration. The dependence of the weight loss of the 05Kh22AG15N8M2F and 12Kh18N10T steels on the test time is found to be linear. 相似文献
7.
T. S. Argunova E. I. Belyakova I. V. Grekhov A. G. Zabrodskiĭ L. S. Kostina L. M. Sorokin N. M. Shmidt J. M. Yi J. W. Jung J. H. Je N. V. Abrosimov 《Semiconductors》2007,41(6):679-683
The results of studying the structural and electrical properties of structures produced by the method of direct bonding of Ge x Si1?x and Si wafers are reported. The wafers were cut from the crystals grown by the Czochralski method. Continuity of the interface and the crystal-lattice defects were studied by X-ray methods using synchrotron radiation and by scanning electron microscopy. Measurements of the forward and reverse current-voltage characteristics of the p-Ge x Si1?x /n-Si diodes made it possible to assess the effect of the crystallattice defects on the electrical properties of heterojunctions. Satisfactory electrical parameters suggest that the technology of direct bonding is promising for the fabrication of large-area Ge x Si1?x /Si heterojunctions. 相似文献
8.
A method for determining the energy spectrum of charges and surface-state densities at the interfaces of semiconductor-insulator-semiconductor structures was developed; the method is based on the analysis of capacitance-voltage characteristics. The method was experimentally tested with Si-SiO2-Si structures prepared by direct bonding of both mirror-polished smooth wafers and wafers with a regular mesoscopic relief pattern at the inner surface of the wafers to be bonded. The density of surface states is lower at the surfaces with a regular relief pattern than that at the surfaces without the surface relief. 相似文献
9.
Mikhail M. Feldstein Tatiana I. Kiseleva Galina N. Bondarenko Julia V. Kostina Parminder Singh Gary W. Cleary 《应用聚合物科学杂志》2009,112(3):1142-1165
Mechanisms of molecular interaction in the blends of a polybase, a copolymer of N,N‐dimethylaminoethylmethacrylate with methylmethacrylate and butylmethacrylate (PDMAEMA–MMA/BMA), with a polyacid, a copolymer of methacrylic acid with ethylacrylate (PMAA‐co‐EA), and plasticizer, triethylcitrate (TEC), have been investigated with FTIR Spectroscopy and potentiometry. To evaluate the strengths of hydrogen and ionic bonds in the polyelectrolyte complexes, quantum‐chemical calculations were performed. According to this analysis, the energy of ionic and hydrogen bonding diminishes in the order: multi‐component complexes involving protonated aminogroup of DMAEMA (ammonium cation) in the presence of chlorine counterion with ionized or unchanged carboxyl groups and water molecules (690–520 kJ/mol) > ternary H‐bonded acid‐base complexes associated with molecule of water (520–420 kJ/mol) > binary ionic complex of carboxylate anion and ammonium cation (404 kJ/mol) > H‐bonded complex of carboxylate and ammonium ions (257 kJ/mol) > binary H‐bonded complex of uncharged carboxyl group with ammonium cation (114 kJ/mol) > ternary H‐bonded complex of uncharged carboxyl group, aminogroup and water molecule (43 kJ/mol) > binary H‐bonded complex between nonionized carboxyl and amino groups (26 kJ/mol). Proton‐donating capability of functional groups in the studied polyelectrolyte blends diminishes in the order: HN+(CH3)2 ? > HOOC? > HO? . The proton‐donating capacity can be significantly improved in the presence of Cl? ions, the effect of which may be appreciably inhibited if Na+ cations are available in the blend or solution. Proton‐accepting capability weakens in the order: uncharged aminogroup > carboxylate anion > uncharged carboxyl group > hydroxyl group. The results of quantum chemical calculations facilitate interpretation of FTIR spectra. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
10.
O. I. Kostyukova E. A. Kostina N. M. Fedortsova 《Automatic Control and Computer Sciences》2010,44(4):179-190
In the paper, an optimal control problem with weighted L
1-norm in the cost function is studied. The problem is considered as a parametric problem where L
1-norm weight ratio is treated as a parameter. We analyze the dependence of solution to the mentioned optimization problem
on values of the parameter. A theorem that describes properties of the solution under small parameter perturbations is proved.
Differential properties of the solution are investigated. Under assumption that a solution to unperturbed problem is known,
rules for construction of solutions to perturbed optimization problems are given. 相似文献