Hot Corrosion and Protection of a Cast Nickel-Base Superalloy for Gas Turbine

A more accurate life prediction for gas turbine blade takes into account the material behavior under the complex thermo-mechanical fatigue (TMF) cycles normally encountered in turbine operation. An experimental program has been carried out to address the thermo-mechanical fatigue life of the IN738LC nickel-base superalloy. High temperature out-of-phase and in-phase TMF experiments in strain control were performed on superalloy materials. Temperature interval of 450-850 was applied to thermo-mechanical fatigue tests. The stress-strain response and the life cycle of the material were measured during the test. The mechanisms of TMF damage is discussed based on the microstructural evolution during TMF. The plastic strain energy based life pediction models were applied to the stress-strain history effect on the thermo-mechanical fatigue lives.

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Effect of Environmental Factors on the Creep Rupture Properties of a Nickel-Base Superalloy Subjected to Hot Corrosion

Transactions of the Japan Institute of Metals ◽

10.2320/matertrans1960.29.26 ◽

1988 ◽

Vol 29 (1) ◽

pp. 26-41 ◽

Cited By ~ 9

Author(s):

Masayuki Yoshiba ◽

Ohmi Miyagawa ◽

Hiroyuki Mizuno ◽

Hiroshi Fujishiro

Keyword(s):

Environmental Factors ◽

Hot Corrosion ◽

Creep Rupture ◽

Nickel Base Superalloy ◽

Nickel Base ◽

Rupture Properties ◽

Base Superalloy

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The effect of EB PVD coatings on structure and properties of nickel-base superalloy for gas turbine blades

Surface and Coatings Technology ◽

10.1016/0257-8972(94)02398-0 ◽

1996 ◽

Vol 78 (1-3) ◽

pp. 113-123 ◽

Cited By ~ 15

Author(s):

A.A. Tchizhik ◽

A.I. Rybnikov ◽

I.S. Malashenko ◽

S.A. Leontiev ◽

A.S. Osyka

Keyword(s):

Gas Turbine ◽

Turbine Blades ◽

Nickel Base Superalloy ◽

Structure And Properties ◽

Pvd Coatings ◽

Gas Turbine Blades ◽

Nickel Base ◽

Base Superalloy

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The eddy-current and ultrasonic investigations of the nickel-base superalloy the gas turbine engine blades after exploitation

Journal of Physics Conference Series ◽

10.1088/1742-6596/2131/5/052025 ◽

2021 ◽

Vol 2131 (5) ◽

pp. 052025

Author(s):

A V Gonchar ◽

V V Mishakin ◽

V A Klushnikov ◽

K V Kurashkin

Keyword(s):

Gas Turbine ◽

Eddy Current ◽

Ultrasonic Waves ◽

Turbine Engines ◽

Actual State ◽

Nickel Base Superalloy ◽

Gas Turbine Engines ◽

Eddy Current Method ◽

Nickel Base ◽

Base Superalloy

Abstract The work carried out microstructural, eddy-current and ultrasonic studies of the material of spent blades of gas turbine engines made of nickel-base superalloy. To determine the degree of damage to the material of the spent blades, studies of the microstructure were carried out on a scanning electron microscope. It was found that γ' coagulation occurred in some specimens, which corresponds to overheated material. Acoustic studies of the material were carried out using the ultrasonic pulse echo method. Comparative analysis showed that in such specimens there is a significant decrease in the velocity of propagation and attenuation of longitudinal ultrasonic waves. It is found that the readings of the eddy-current flaw detector in overheated specimens differ more than twice in comparison with non-overheated specimens. This fact can be used for operational non-destructive testing of the actual state of the metal structure by the eddy current method with the aim of further safe operation of gas turbine engines.

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A New Gas Turbine Combustor Alloy

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries; Technology Resources ◽

10.1115/84-gt-70 ◽

1984 ◽

Cited By ~ 2

Author(s):

D. L. Klarstrom ◽

H. M. Tawancy ◽

D. E. Fluck ◽

M. F. Rothman

Keyword(s):

Solid Solution ◽

Gas Turbine ◽

Turbine Engines ◽

Nickel Base Superalloy ◽

Gas Turbine Engines ◽

Gas Turbine Combustor ◽

High Temperature Alloys ◽

Oxidation Properties ◽

Nickel Base ◽

Base Superalloy

A wrought, nickel-base superalloy based on the Ni-Cr-W system has been developed for applications in the hot section of gas turbine engines. The new alloy is solid solution strengthened and very thermally stable. It particularly resists the formation of detrimental intermetallic compounds and contains little or no cobalt. Various mechanical and oxidation properties of the new alloy were measured, and the microstructural features were characterized. These were compared with those for other solid solution strengthened, high-temperature alloys. A number of advantages of the new alloy are defined.

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