scholarly journals OS2(3)-11(OS02W0120) Change of Ultrasonic Attenuation and Microstructure Evolution During Creep of Nickel Base Superalloy

2003 ◽  
Vol 2003 (0) ◽  
pp. 161
Author(s):  
Toshihiro Ohtani ◽  
Hirotsugu Ogi ◽  
Masahiko Hirao
Keyword(s):  
Microstructure Evolution ◽  
Ultrasonic Attenuation ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Plastic Flow and Microstructure Evolution during Thermomechanical Processing of a PM Nickel-Base Superalloy

2013 ◽  
Vol 44 (6) ◽  
pp. 2778-2798 ◽  
Author(s):  
S. L. Semiatin ◽  
K. E. McClary ◽  
A. D. Rollett ◽  
C. G. Roberts ◽  
E. J. Payton ◽  
...  
Keyword(s):  
Plastic Flow ◽  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
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.

Microstructure Evolution during Supersolvus Heat Treatment of a Powder Metallurgy Nickel-Base Superalloy

2012 ◽  
Vol 43 (5) ◽  
pp. 1649-1661 ◽  
Author(s):  
S. L. Semiatin ◽  
K. E. McClary ◽  
A. D. Rollett ◽  
C. G. Roberts ◽  
E. J. Payton ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Powder Metallurgy ◽  
Microstructure Evolution ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Microstructure Evolution and Strain Features of a Single Crystal Nickel Base Superalloy during Tensile/Compression Creep

2007 ◽  
Vol 546-549 ◽  
pp. 1225-1228
Author(s):  
Fan Lai Meng ◽  
Su Gui Tian ◽  
Ming Gang Wang ◽  
Xing Fu Yu ◽  
Hong Qiang Du ◽  
...  
Keyword(s):  
Single Crystal ◽  
Microstructure Evolution ◽  
Tensile Creep ◽  
Stress Axis ◽  
Nickel Base Superalloy ◽  
Direction Parallel ◽  
Compression Creep ◽  
Nickel Base ◽  
P Type ◽  
Base Superalloy

By means of tensile and compression creep testing and SEM, TEM observation, an investigation has been made into the microstructure evolution of a single crystal nickel base superalloy during tensile / compression creep. Results show that the cubic γ′ phase in the superalloy is transformed into the N-type meshlike structure along the direction vertical to stress axis during tensile creep. The cubic γ′ phase is transformed into the P-type structure along the direction parallel to stress axis during compression creep. An obvious asymmetry strain of the alloy occurs during tensile and compression creep, the formation of the needle-like γ′ rafts during compression creep is a main reason of the alloy displaying a smaller strain. During compressive creep, the deformation feature of the alloy is the <110> and (1/3) <112> super dislocations shearing into the γ′ rafts. The deformation mechanism of the alloy, in the stage state of tensile creep, is dislocation climb over the γ′ rafts.

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