The structure and phase composition of samples of a ceramic material fabricated from lanthanum hexaboride by the sintering method were investigated. It was found that the formation of a high-quality ...consolidated structure with closed pores is observed at sintering temperature 1850°C. It is shown that the addition of nickel intensifies the sintering process and levels the influence of the sintering temperature on the grain size and volume fraction of the pores. Nickel in this case is found in the base material of the LaB
6
grains as well as in the form of finely disperse intermetallics on grain boundaries.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
This article investigates the change in the structure of heat-resistant nickel alloys doped with cobalt, chromium, molybdenum, aluminum, niobium, tungsten, and titanium and aluminum, cobalt, rhenium, ...tantalum, ruthenium, molybdenum, tungsten, and chromium under the influence of a solution of 75%Na
2
SO
4
+ 25%NaCl in temperature range 600–750°C. As the results of the study show, a corrosive film of a layer structure based on oxides of chromium, aluminum, nickel and nickel sulfides is formed on the metal surface. It has been established that the nature of corrosion destruction of metal depends on the composition and content of alloying elements in it.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Aspects of the long-term strength and thermal fatigue of refractory metal-powder alloy KhN56KVMTYuB for gas turbine engine (GTE) disks operating in contact with corrosive environments are considered. ...The alloy is tested for long-term strength at 700, 750 and 800°C in air and in a salt medium by two methods differing in the manner of introduction of the corrosive medium and in the states of its aggregation (a solution or a melt). Samples subjected to preliminary high-temperature corrosion in salt solutions or melts are tested for the resistance to thermal fatigue in vacuum. The structure of the corroded samples is studied after testing by static and thermocycling loading.
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The microstructure of a 1417M alloy after magnetohydrodynamic (MHD) treatment has been studied. An electric field induced in the aluminum alloy melt is shown to cause electric transfer and to ...homogenize its structure. During the formation of an ingot upon MHD treatment, intermetallic phase dendrites are preferably oriented along the lines of the induced electric field.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Experimental heats of low-alloy steel are performed under various conditions of rare-earth metal microalloying and aluminum and calcium deoxidation. Electron-probe microanalysis of nonmetallic ...inclusions and a metallographic investigation of a metal are used to show that, when interacting with water, nonmetallic cerium oxide inclusions do not form hydrates and, correspondingly, are not aggressive. When aluminum, calcium, and cerium additions are sequentially introduced into a melt, a continuous cerium oxide shell forms on calcium aluminates, protects corrosive nonmetallic inclusions against interaction with water, and weakens local metal corrosion.
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7.
Curve of calcium deoxidation of iron Kotel’nikov, G. I.; Zubarev, K. A.; Movenko, D. A. ...
Russian metallurgy Metally,
06/2016, Volume:
2016, Issue:
6
Journal Article
Peer reviewed
The experimental data reflecting the thermodynamic features of deoxidation of liquid iron with metallic calcium are analyzed. A correction technique is proposed for a metallic melt–deoxidizer ...deoxidation curve according to the standard state by Henry’s law.
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The formation of a region where corrosive inclusions interact with metal in an aqueous medium is investigated. The inclusion expands as a result of hydration, and corresponding tensile and ...compressive zones are formed. On the basis of the results, the mechanical-stress distribution around hydrating inclusions is simulated.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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