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Цивірко, Е. І.; Zhemanyuk, P. D.; Клочихін, В. В.; Наумик, В. В.; Lunev, V. V.

doi:10.1023/a:1013648719105

Cited by 10 publications

(6 citation statements)

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“…Шкідливі домішки, виділяючись по межах зерен у неметалевих включеннях, в евтектичній фазі або окремій фазі, можуть знижувати механічні, жароміцні та експлуатаційні властивості деталей [3,[6][7][8][9][10]. При виготовленні деталей методами лиття необхідно застосовувати освіження сплаву додаванням матеріалу вихідної плавки, що дозволяє мінімізувати вплив шкідливих домішок, що потрапляють у сплав з технологічним вороттям.…”

Section: встановлено що у металі дослідної плавки із застосуванням мо...unclassified

Theinfluence of Modification With Yttrium on the Structure and Properties of Castings Obtained From the Жс6у-Ві Alloy Return

Tоmkin¹,

Klochikhin²,

Danylov³

et al. 2023

НМТ

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Purpose. To study the effect of modification of nickel-yttrium ligature with additives on the structure and physical and mechanical properties of ЖС6У-ВІ alloy, smelted using its own technological return in the charge. Research methods. On the УППФ-3М installation with the base crucible, experimental melting of standart technological return of the ЖС6У-ВІ alloy was carried out using high-temperature melt processing. Experimental samples for mechanical tests and determination of stress-rupture strength were cast from the obtained ingots, cut into measured batch blanks and cleaned in a shot blasting drum, using the method of equiaxial crystallization in ceramic molds. When pouring one ceramic mold, the metal melt at a temperature of 1540 °C was modified with a nickel-yttrium ligature of the ІтН1 brand (grain size 2...5 mm) in the amount of 0.136 % of the mass of the charge in a crucible with a holding time of 1 min 15 s ... 1 min. The second block was poured without modification. Cooling of the poured blocks was carried out at the melting site at normal ambient temperature. The samples underwent heat treatment according to ОСТ 1 90126-85: heating to a temperature of 1210 ± 10 °C, holding for 4 hours, cooling in air. The balance of the chemical composition of the experimental alloys was evaluated by the computational and analytical method. The chemical composition of the alloy of experimental variants was determined. The microstructure and mechanical properties at room temperature were studied. Stress-rupture strength tests were performed at 975 °C under a load of 230 MPa. Results. Experimental melting of the charge was carried out, which consisted exclusively of our own technological return of the ЖС6У-ВІ alloy with the use of high-temperature processing of the melt and modification with a nickel-yttrium ligature. The chemical composition, microstructure of the experimental alloy, its mechanical properties at room temperature, and heat resistance indicators were studied. A method of determining the degree of balance of the chemical composition of modern superalloys based on the total content of groups of alloying elements is proposed. Scientific novelty. Calculations carried out in accordance with the proposed method of determining the degree of balance of the chemical composition of the alloy show that for the experimental variants, phase separations may form along the grain boundaries. Studies of the microstructure confirmed the separation of the γ-γ' eutectic phase in the form of a “white” border along the thickened grain boundaries in the metal of the ЖС6У-ВІ alloy sample. According to the calculations of the metal alloying system balance for experimental melts, not only the thickening of the grain boundaries and the separation of the γ-γ' eutectic phase, but also a decrease in mechanical properties and stress-rupture strength can be observed. The application of modification with nickel-yttrium ligature in the amount of 0.136 % in the remelting process with the use of high-temperature processing of the ЖС6У-ВІ alloy return melt allows to ensure the formation of grain boundaries without visible discharges (pollution). It was established that in the metal of the experimental melting with the application of modification with nickel-yttrium ligature, carbides have globular and lamellar morphology. There is no separation of the γ-γ' eutectic phase. The mechanical properties and stress-rupture strength of the metal of the experimental melts with the use of high-temperature processing of the melt of the conditioned return of the ЖС6У-ВІ alloy, both with and without modification by nickel-yttrium ligature, meet the requirements of OST 1 90126-85, but at the same time, they are lower than the properties of the alloy cast with charge refreshment. Practical value. A computational and analytical method of determining the degree of balance of the chemical composition of modern heat-resistant alloys based on the total content of certain groups of alloying elements is proposed. It was established that the modification of nickel-yttrium ligature with additives significantly improves the microstructure of castings obtained from the technological return of the ЖС6У-ВІ alloy and creates conditions for a general improvement in the quality of the material of the responsible castings. The conducted studies show that the use of 0.136 % nickel-yttrium ligature allows to clean grain boundaries, change the morphology of non-metallic inclusions and counteract the segregation of eutectic inclusions in nickel-based superalloys alloys.

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Section: встановлено що у металі дослідної плавки із застосуванням мо...unclassified

Theinfluence of Modification With Yttrium on the Structure and Properties of Castings Obtained From the Жс6у-Ві Alloy Return

Tоmkin¹,

Klochikhin²,

Danylov³

et al. 2023

НМТ

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“…Therefore, it is believed that the solidification microstructure variation for the elevated superheating temperature cannot be owing to the external solidification parameter but should be attributed to the internal melt characteristic change. It has been found that Ni 3 Al-like cluster, residual MC carbide and other highmelting particle still exist in the Ni-based superalloy melt near the liquidus [8][9][10][11][12][13][14]. With the melt temperature increase, those clusters will decrease in their sizes and even disappear, which leads to the increase of composition uniformity.…”

Section: As-cast Microstructurementioning

confidence: 99%

“…The melt at this kind of equilibrium or near equilibrium state has increased supercooling degree and compressed temperature range for crystallization [10][11][12][13][14]. It is very important that due to the so-called "heredity effect", the melt will remain its high temperature characteristic to a certain extent even when it is cooled down [3][4][5][7][8][9][10][11][12][13][14]. Thus the melt characteristic change caused by superheating at 1640 • C or 1780 • C will be partially reserved to 1500 • C, which consequently results in the change of solidification characteristic of single crystal superalloy with refined dendrite and ␥ precipitate and decreased dendrite segregation.…”

Section: As-cast Microstructurementioning

confidence: 99%

“…It has been shown that the melt structure, the solidification microstructure and the performance of Al-Si alloy, Nd-Fe-B alloy and superalloy can be significantly modified by the melt overheating treatment [5][6][7][8][9]. The researchers in Russia have studied the superalloy melt structure in detail and have put forward a technique named high temperature treatment of melt (HTTM) for high-performance superalloy casting [10][11][12][13][14]. It has been pointed out that the melt just above the liquidus temperature is generally in nonequilibrium state consisting of different kinds of atom clusters.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and stress rupture property of Ni-based monocrystal superalloy with melt superheating treatment

Zhang

Zou

et al. 2009

Journal of Alloys and Compounds

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“…Scientific and practical developments in recent years of world centres engaged in materials science of heat-resistant nickel alloys for gas turbines, aircraft engines have considered materials for blades with low chromium content [8][9][10]. In this case, the most promising heatresistant alloys based on nickel (superalloys) for gas turbine blades are alloys doped with rhenium [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Refractory Elements on Phase–Structural Stability of Heat-Resistant Corrosion-Resistant Alloys for Gas Turbine Blades

Kvasnytska,

Shalevska,

Balitskii

et al. 2024

Metallofiz. Noveishie Tekhnol.

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One of the ways to improve the performance of gas-turbine engine blades is improvement the alloying complexes of heat-resistant nickel alloys used for casting. The influences of refractory metals on the macro-and microstructure and the properties of alloys of this type are analysed. It is proposed to introduce rhenium and tantalum into a heat-resistant corrosion-resistant nickel alloy for the production of working blades of gas-turbine engines. The paper presents the results of the study of the influence of chemical composition on the phase-structural components of heat-resistant alloy. Phasetransition temperatures for a new heat-resistant corrosion-resistant nickel alloy containing rhenium and tantalum have been established: liquidus temperature is of ≅ 1370°С, solidus temperature is of 1320°С. Studies of the microstructure of the obtained samples in the cast state, after heating and cooling in calorimetric studies, make it possible to confirm that the phasestructural state corresponds to the alloy of this type, it consists of γ-solid solution including γ′-phase and carbides. Rhenium is mainly part of the γ-solid solution, and tantalum strengthens the cell boundaries. When analysing the structures of the studied samples after heating in a calorimeter to 1250°C,

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Cited by 10 publications

References 1 publication

Theinfluence of Modification With Yttrium on the Structure and Properties of Castings Obtained From the Жс6у-Ві Alloy Return

Theinfluence of Modification With Yttrium on the Structure and Properties of Castings Obtained From the Жс6у-Ві Alloy Return

Microstructure and stress rupture property of Ni-based monocrystal superalloy with melt superheating treatment

Influence of Refractory Elements on Phase–Structural Stability of Heat-Resistant Corrosion-Resistant Alloys for Gas Turbine Blades

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