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11.
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. |
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The phase diagram, the glass formation, and the physicochemical properties of glass-forming and crystalline compositions in the Sb2S3-AgI system are investigated. Glasses in this system are moisture-resistant and have high refractive indices. These materials can be used in optical devices operating in the long-wavelength spectral range and as membranes for chemical sensors. The phase diagram of the Sb2S3-AgI system is constructed from the data of X-ray powder diffraction and differential thermal analyses. 相似文献
14.
M. A. Gotovskii B. S. Fokin M. Ya. Belen’kii M. E. Lebedev M. A. Blinov M. Yu. Egorov 《Thermal Engineering》2012,59(2):113-118
Results from tests of the modernized moisture separator-reheaters MSRs-500-1 with Powervane louvers developed by Balcke-Dürr
company are presented. Results fromstudies on the determination of wetness of the heated steam at the outlet from the separating
part of the MSR and its temperature between super-heating stages, which demonstrate advantages of modernized MSR are discussed. 相似文献
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16.
E. V. Blinov 《Russian Metallurgy (Metally)》2016,2016(1):52-57
The structure of the surface layer in high-nitrogen 05Kh22AG15N8M2F steel workpieces subjected to face turning is studied by electron microscopy. It is found that improved machinability by VK8 alloy cutting tools is achieved at a cutting depth of 0.25 mm and that the cutting-tool life decreases sharply when the cutting depth increases to 1 mm. A nanocrystalline structure with nanocrystal sizes from several to several tens of nanometers forms in the surface layer upon face turning in the as-cast, hot-rolled, and thermally deformed states. The structure of the surface layer is characterized by a high dislocation density and large austenite fragments with broad subgrains and deformation twins. 相似文献
17.
The structural and phase transformations in high-nitrogen austenitic steel 05Kh20AG10N3MF under various thermal actions are
studied. The transformations are shown to occur only in the Fe-Cr diffusion couple, and they resemble the phase transformations
in an Fe-20% Cr binary alloy. At 1200°C, hightemperature phase separation is detected; at 550°C or below, low-temperature
separation is detected; and at 700 and 800°C, ordering with the formation of a Laves phase is observed. The ordering-low-temperature
separation phase transition in the steel differs substantially from that occurring in Fe-Cr binary alloys. 相似文献
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20.
M. V. Kurushkin A. V. Semencha L. N. Blinov M. D. Mikhailov 《Glass Physics and Chemistry》2014,40(4):421-427
New glass compositions in the PbO-PbCl2-PbBr2 system are synthesized and the region of vitrification is established. The temperature of sample vitrification is determined using the technique of differential-thermal analysis and the influence of the components on the temperature of vitrification has been studied. Infrared, Raman, and X-ray photoelectronic spectra are registered, suggestions about the glass structure are made, and the X-ray-phase analysis has been carried out. The density is measured and the refractive index of glass is estimated. 相似文献