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

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.

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.

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
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