A Study of the Effect of Nitrogen on the Structure and Properties of Single Crystals of Castable Refractory Alloy ZhS30-VI

Kablov, D. E.; Chabina, E. B.; Сидоров, В. В.; Min, P. G.

doi:10.1007/s11041-013-9643-3

Cited by 15 publications

(3 citation statements)

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“…Experiences have been given in [7-10] of using REM in processing cast superalloy waste, which forms in engine building and repair plants, and having increased contamination by harmful impurities and nonmetallic inclusions [11][12][13].…”

Section: Kramermentioning

confidence: 99%

Technology of Alloy VZh175 Preparation for GTE Disks from Conditioned Waste

et al. 2016

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669.245:621.438 and V. V. KramerA technology is developed for preparing wrought superalloy VZh175 for turbine disks using up to 100% conditioned waste. The technology developed makes it possible to obtain alloy no worse than that prepared from fresh charge materials with respect to alloying element content, impurities, structure, and mechanical properties. The cost of the alloy made using 100% conditioned waste is 20-30% lower than that for alloy melted by industrial technology using up to 50% conditioned waste.Creation of advanced engines and other objects for aviation technology is impossible without using new materials within them, including nickel superalloys, governing to a signifi cant extent an increase in the level of tactical and engineering properties, reliability, and life of these objects [1].Recently, at the All-Russia Research Institute of Aviation Materials (VIAM) wrought nickel superalloys have been developed for turbine disks and welded components of the hot channel of advanced gas turbine engines (GTE) and gas turbine installations (GTI), along wiyh the industrial technology for their production, which has made it possible to start their introduction into manufacture of objects at Aviadvigatel, NPO Saturn, and others [2]. However, extensive introduction of these alloys into domestic engine building is held back due to a requirement for highly alloyed scarce expensive components.In order to resolve this problem, apart from improvement of manufacturing technology for semifi nished products with the aim of improving effi ciency, it has been suggested that during melting of advanced wrought alloys conditioned waste obtained during their formation be used: ingot bottoms and risers, forging scrap, scrap components, etc.In order to retain alloy properties with the use of up to 100% conditioned waste, it is necessary to develop special production methods, providing a content of alloying elements and impurities during melting at the level of their content in metal prepared by industrial technology.Analysis of well-known theoretical situations of thermodynamics and kinetics of vacuum metallurgy shows that the most effective solution of this problem may be alloying materials with rare-earth metals (REM) [3][4][5][6].Experiences have been given in [7-10] of using REM in processing cast superalloy waste, which forms in engine building and repair plants, and having increased contamination by harmful impurities and nonmetallic inclusions [11][12][13].The authors have developed a resource-saving technology for processing cast superalloy waste, and an important role in implementing this technology was provided by REM whose introduction into waste made it possible to reduce considerably the level of harmful impurity content and nonmetallic inclusions in fi nished objects.Melting of alloy VZh175 was carried out in a VIAM2002 vacuum induction furnace in a crucible with a capacity of 20 kg. Pouring was carried out into a tube 90 mm in diameter with a heated insert for reducing shrinkage cavities and improving accept...

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Section: Kramermentioning

confidence: 99%

Technology of Alloy VZh175 Preparation for GTE Disks from Conditioned Waste

et al. 2016

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“…5,6 It is found that the fatigues of nickel-base superalloys originate from the cracking of the brittle inclusions and matrix. [7][8][9][10] In view of the substantial economic benefit of recycling revert nickel-base superalloys, it is necessary to investigate the effect of nitrogen content on the microstructure and properties of nickel-base superalloys.…”

Section: Introductionmentioning

confidence: 99%

“…Painter and Young 14 found that microporosity increased with the increase of CrN, but decreased when the amount of TiN was increased. Having worked on the effect of nitrogen admixtures on the low-cycle fatigue of the alloy ZhS30-VI single crystals, Kablov et al 9,10 suggested that the low-circle fatigue was decreased significantly when the nitrogen content increased from 5 to 20 ppm. Although the effect of nitrogen was investigated by adding nitrides, whether the nitrides decomposed or not in the molten nickel-base superalloy is not clear.…”

Section: Introductionmentioning

confidence: 99%

Effect of nitrogen content on the microstructure and mechanical properties of a cast nickel-base superalloy

Guo

et al. 2016

Ironmaking & Steelmaking

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The effects of nitrogen content on the microstructure and the mechanical properties of a cast nickel-base superalloy (CNS) have been investigated experimentally. Experimental results demonstrated that the grain structure of CNS samples was refined by increasing the nitrogen content, but the area percentage of microporosity has been augmented with increased nitrogen content. Increasing the nitrogen content resulted in the morphology evolution of carbide from an acicular or 'Chinese hieroglyphs' type to blocky one, while negligible change of the morphology of γ ′ precipitates was observed. Finally, it was found that the tensile strength has no obvious variation as the nitrogen content increases from 5 to 26 ppm, but it reduces sharply when the nitrogen content is raised to 34 ppm. The elongation decreases gradually with increasing nitrogen content.

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