Experimental characterization of fatigue damage in a nickel-base superalloy using nonlinear ultrasonic waves

2006 ◽  
Vol 120 (3) ◽  
pp. 1266-1273 ◽  
Author(s):  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Jianmin Qu ◽  
Jerrol W. Littles
Keyword(s):  
Fatigue Damage ◽  
Ultrasonic Waves ◽  
Nickel Base Superalloy ◽  
Experimental Characterization ◽  
Nonlinear Ultrasonic ◽  
Nickel Base ◽  
Base Superalloy

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

Application of Atom Probe Microanalysis for Understanding Microstructure Evolution in Nickel Base Superalloy Welds

2000 ◽  
Vol 6 (S2) ◽  
pp. 350-351
Author(s):  
S. S. Babu ◽  
S. A. David ◽  
M. K. Miller
Keyword(s):  
Microstructure Evolution ◽  
Predictive Models ◽  
Strong Relationship ◽  
Atom Probe ◽  
Systematic Investigation ◽  
Nickel Base Superalloy ◽  
Cooling Conditions ◽  
Nickel Base ◽  
Base Superalloy

The characterization of the microstructure evolution during welding of nickel base superalloys is required for efficient reuse and reclamation of used and failed components. Previous atom probe analysis of electron-beam and laser-beam welds revealed complex alloying elemental partitioning between the γ and γ phases. Rapid cooling conditions in the weld leads to non-equilibrium partitioning and large amplitude Cr and Co levels in the γ phase. These results indicated that there is a strong relationship between weld cooling rate and the precipitation of γ′ precipitates from the γ phase. To understand and develop predictive models, a systematic investigation of the microstructure evolution in CM247DS alloy under controlled thermomechanical conditions are being performed. This paper describes some recent results on the elemental partitioning between γ and γ′ phases obtained with atom probe microanalysis.

APFIM characterization of single-crystal PWA 1480 nickel-base superalloy

1994 ◽  
Vol 76-77 ◽  
pp. 172-176 ◽  
Author(s):  
M.K Miller ◽  
R Jayaram ◽  
L.S Lin ◽  
A.D Cetel
Keyword(s):  
Single Crystal ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Characterization of Gamma Prime Phase in Hafnium Doped IN-738LC Nickel Base Superalloy

2014 ◽  
Vol 4 (2) ◽  
pp. 121
Author(s):  
AliAkbar Saghafi ◽  
JamshidAghazade Mohandesi ◽  
Hamid RezaAlizade Attar
Keyword(s):  
Nickel Base Superalloy ◽  
Gamma Prime ◽  
Nickel Base ◽  
Base Superalloy ◽  
Prime Phase

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

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.

TEM and 3D atom probe characterization of DMS4 cast nickel-base superalloy

2009 ◽  
Vol 44 (9) ◽  
pp. 2218-2225 ◽  
Author(s):  
K. Muraleedharan ◽  
R. Balamuralikrishnan ◽  
N. Das
Keyword(s):  
Atom Probe ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy
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