Superplastic Forming and Diffusion Bonding for Four-Layer Sheets Structure of Nickel-Base Superalloy

2007 ◽  
pp. 163-168
Author(s):  
Wen Bo Han ◽  
D.Z. Wu ◽  
Guo Feng Wang ◽  
M.J. Tong
Keyword(s):  
Diffusion Bonding ◽  
Superplastic Forming ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
And Diffusion ◽  
Base Superalloy

scholarly journals Slip Delocalization and Diffusion Mediated Carbide Formation during Fatigue of a Nickel-Base Superalloy

2020 ◽  
pp. 106077
Author(s):  
Yejun Gu ◽  
Jean Charles Stinville ◽  
Patrick G. Callahan ◽  
McLean P. Echlin ◽  
Tresa M. Pollock ◽  
...  
Keyword(s):  
Nickel Base Superalloy ◽  
Carbide Formation ◽  
Nickel Base ◽  
And Diffusion ◽  
Base Superalloy

Superplastic Forming and Diffusion Bonding for Four-Layer Sheets Structure of Nickel-Base Superalloy

2007 ◽  
Vol 551-552 ◽  
pp. 163-168
Author(s):  
Wen Bo Han ◽  
D.Z. Wu ◽  
Guo Feng Wang ◽  
M.J. Tong
Keyword(s):  
Diffusion Bonding ◽  
Shear Fracture ◽  
Bonding Temperature ◽  
Superplastic Forming ◽  
Pressure Control ◽  
Nickel Foil ◽  
Nickel Base Superalloy ◽  
Bonding Parameters ◽  
And Diffusion ◽  
Foil Interlayer

The superplastic forming and diffusion bonding (SPF/DB) is applied in aviation and space flight field. The SPF/DB process with gas pressure control for dissimilar superalloy structure was studied. Diffusion bonding parameters, including bonding temperature T, pressure P, time t, affect the joining mechanism. When the bonded specimen with 50&m thick nickel foil interlayer was tensile at room temperature, shear fracture of the joints with nickel foil interlayer takes place at the GH4141 superalloy part. The SPF/DB of four-layer sheets structure was investigated. The optimum parameters for the SPF/DB process are: forming temperature T=1243K, forming pressure P=1MPa, forming time t=35min. The microstructure of the bonded samples was characterized. The microstructure shows an excellent bonding at the interfaces. The distribution of thickness after SPF/DB was investigated.

Segregation and diffusion behavior of niobium in a highly alloyed nickel-base superalloy

2011 ◽  
Vol 21 (11) ◽  
pp. 2402-2407 ◽  
Author(s):  
Xiao-lin PAN ◽  
Hai-yan YU ◽  
Gan-feng TU ◽  
Wen-ru SUN ◽  
Zhuang-qi HU
Keyword(s):  
Nickel Base Superalloy ◽  
Diffusion Behavior ◽  
Nickel Base ◽  
And Diffusion ◽  
Base Superalloy ◽  
Alloyed Nickel

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

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.

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