The application of new wrought nickel alloys for advanced gas turbine engines

Lomberg, B. S.; Ovsepyan, S. V.; Bakradze, M.M.; Letnikov, M.N.; Mazalov, I. S.

doi:10.18577/2071-9140-2017-0-s-116-129

Cited by 12 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Heat-resistant nickel-based alloys are widely used as construction materials in aerospace engineering, including fabrication of the details of the hot zone of gas turbine engines owing to sufficiently high thermal stability of structure and creep strength at elevated temperatures along with high corrosion stability [1][2][3][4][5][6]. The working temperature of nickel-and cobaltbased alloys with intermetallic or solid-solution strengthening varies from 750 (Inconel 718, VZh172) to 1100°C (VZh145, HS188) [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of the Structure, Phase Composition, and Mechanical Properties of Ni-Based High-Temperature Alloys Manufactured by Different Methods

Tokmacheva-Kolobova

Манохин

Санин

et al. 2020

Inorg. Mater. Appl. Res.

View full text Add to dashboard Cite

A comprehensive comparative study of the structure, phase composition, and mechanical properties of heat-resistant nickel-based Ni-Cr-(X) alloys produced by the methods of traditional metallurgy and self-propagating high-temperature synthesis (SHS metallurgy) is carried out. With the purpose of formation of the submicrocrystalline structure, a longitudinal rolling and post-deformation annealing of the cast alloy is performed. The microstructure of the heat-resistant alloys is investigated by the SEM and TEM methods. It is shown that the cast alloy has a recrystallized structure with the mean grain size of ~1 μm and the particles of chromium carbides have a size of ~1-3 μm. After rolling and subsequent annealing (750°C/1 h), the average grain size is reduced to 0.43 μm and the formation of dispersed particles of carbides 100 nm in size is observed. The structure of the alloy obtained by SHS metallurgy is dendritic, and particles of W and Cr are absent. When 0.1 wt % carbon powder is added to the initial powder mixture for SHS synthesis, formation of the network of W and Cr particles is observed along the boundaries of dendrite colonies. It is found that the SHS Ni-based heat-resistant alloy similar in composition to commercial cast alloy is characterized by improved mechanical properties and increased heat resistance compared to the cast alloy in both the coarsegrained and the submicrocrystalline state. Adding the carbon powder to the powder mixture for SHS leads to a further increase in the resistance to high-temperature deformation owing to formation of the carbide phase impeding the movement of dislocations and grain boundary creeping processes.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of the Structure, Phase Composition, and Mechanical Properties of Ni-Based High-Temperature Alloys Manufactured by Different Methods

Tokmacheva-Kolobova

Манохин

Санин

et al. 2020

Inorg. Mater. Appl. Res.

View full text Add to dashboard Cite

show abstract

“…In the dispersion-hardended alloys based on Ni with the working temperature up to 1050°C (VZh98, VZh159, HS 282, etc. ), thermal stability is achieved due to complex alloying of the solid solution and formation of disperse particles of the strengthening '-Ni 3 Al phases with the L1 2 superstructure [5][6][7]. These particles are coherent; they are located in the bulk of the material and ensure dispersion hardening of the alloys.…”

mentioning

confidence: 99%

“…The Federal State Unitary Enterprise VIAM has developed a weldable deformable high-temperature alloy of a new generation -HN29К28VМТ (VZh171), whose maximum operating temperature is 1250°C, which is 150-200°C higher than that of the serial alloys [10]. The structure and balanced composition were selected by the authors so that to ensure the structure stability and rule out the conditions for the formation of topologically close-packed and -phase of chromium nitrides; at present the VZh171 alloy is being actively introduced in the aircraft industry [11,12].…”

mentioning

confidence: 99%

Investigation of the Influence of Thermomechanical Treatment on the Structural-Phase State and Mechanical Properties of a VZh171 Alloy

et al. 2020

View full text Add to dashboard Cite

An analysis of the influence of thermomechanical treatment (TMT) (rolling to a strain degree of 50%, annealing at a temperatures of 600-1200°C, 1 h) on the microstructure and phase composition of a VZh171 alloy in the initial state and after its bulk nitriding is performed. It is shown that nitriding leads to an increase in the thermal stability of the alloy microstructure. While a primary recrystallization and formation of finegrained structure occurs in an non-nitrided alloy quite intensively at the temperature above 1000°C, the process of collective recrystallization does not gain any significant development in the nitrided alloy even at an annealing temperature of 1200°C, and the microstructure remains ultrafine-grained (grain size 5-10 µm). The mechanical properties of the nitrided and non-nitrided alloy are investigated. It is established that nitriding has no significant effect on the alloy strength at room temperature. In the tests at 800°C, the maximum strength and the minimum plasticity are demonstrated by the nitrided alloy after rolling and subsequent annealing at 600°C. The optimum ratio of the ultimate tensile strength (480 MPa) to plasticity (elongation to fracture 23%) is observed in the nitrided alloy after TMT and annealing at 800°C.

show abstract

Comparative Analysis of Features of Technologies for Obtaining Quality Spherical Powder of Nickel Aluminide NiAl

Zharov

2023

Metallurgist

View full text Add to dashboard Cite

The application of new wrought nickel alloys for advanced gas turbine engines

Cited by 12 publications

References 0 publications

Comparative Investigation of the Structure, Phase Composition, and Mechanical Properties of Ni-Based High-Temperature Alloys Manufactured by Different Methods

Comparative Investigation of the Structure, Phase Composition, and Mechanical Properties of Ni-Based High-Temperature Alloys Manufactured by Different Methods

Investigation of the Influence of Thermomechanical Treatment on the Structural-Phase State and Mechanical Properties of a VZh171 Alloy

Comparative Analysis of Features of Technologies for Obtaining Quality Spherical Powder of Nickel Aluminide NiAl

Contact Info

Product

Resources

About