scholarly journals PARTITIONING OF ALLOYING ELEMENTS IN A NICKEL BASE SUPERALLOY CONTAINING Nb AND Mo : AN ATOM-PROBE STUDY

1984 ◽  
Vol 45 (C9) ◽  
pp. C9-379-C9-384 ◽  
Author(s):  
D. Blavette ◽  
A. Bostel ◽  
M. Bouet
Keyword(s):  
Atom Probe ◽  
Alloying Elements ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

A Novel Duplex Re-NiW Based Diffusion Barrier on a Nickel-Base Superalloy for TBC Systems

2008 ◽  
Vol 595-598 ◽  
pp. 127-134 ◽  
Author(s):  
Sebastien Mercier ◽  
Denis Boivin ◽  
Marie Pierre Bacos ◽  
Pierre Josso
Keyword(s):  
Diffusion Barrier ◽  
Bond Coat ◽  
Alloying Elements ◽  
Nickel Base Superalloy ◽  
Coating Process ◽  
Thermal Treatments ◽  
Eds Analysis ◽  
Nickel Base ◽  
Tbc Systems ◽  
Base Superalloy

A diffusion barrier between a 4th generation superalloy (MC-NG) and a β-(Ni, Pt)Al has been studied. The used coating process combines Re and NiW electrolytic deposits followed by thermal treatments. The diffusion barrier is composed of a continuous 3 &m thick ReWNi layer under a 10 &m thick β-(Ni, Pt)Al containing W rich precipitates. EDS analysis on as coated samples and on 50h-1100°C-Ar aged samples showed that the Re-NiW layer works as a diffusion barrier. The Al reservoir in the bond coat after aging is higher with the diffusion barrier than without. The concentrations of alloying elements are also lower in the bond coat with the diffusion barrier than without.

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.

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

Effect of Alloying Elements on Volume Fraction of γ′ Phase in Power Metallurgy Nickel-Base Superalloy

2017 ◽  
Vol 898 ◽  
pp. 430-437 ◽  
Author(s):  
Yang Chen ◽  
Gao Feng Tian ◽  
Lei Zhou ◽  
Yue Wang ◽  
Guo Jun Ma ◽  
...  
Keyword(s):  
Linear Regression ◽  
Aging Temperature ◽  
Volume Fraction ◽  
Alloying Elements ◽  
Nickel Base Superalloy ◽  
Alloying Element ◽  
Empirical Formulas ◽  
Nickel Base ◽  
Base Superalloy ◽  
Effect Of Alloying

The effect of alloying elements on the volume fraction of γ′ phase at aging temperature was investigated. The results indicated the volume fraction of γ′ was mainly sensitive to Al, Ti, Nb, Ta, and Cr. Based on analyzing the chemical component and the volume fraction of γ′ phase of 20 kinds of nickel-base superalloys , a linear regression formula between the volume fraction of γ′ phase and alloying element content was established using Matlab software, and the formula was given as: Vγ′=21.06+5.76Al+0.41Co-0.95Cr+0.84Hf+2.15Nb+0.82Ta+3.06Ti, where the correlation coefficient r = 95.5%. This linear equation was more accurate compared with the three public empirical formulas.

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