Experimental and Theoretical Approaches to the Internal Stress Field in an Annealed Nickel Base Superalloy

1994 ◽  
Vol 1-2 ◽  
pp. 375-384 ◽  
Author(s):  
R. Bonnet ◽  
A. Ati
Keyword(s):  
Stress Field ◽  
Internal Stress ◽  
Nickel Base Superalloy ◽  
Theoretical Approaches ◽  
Internal Stress Field ◽  
Nickel Base ◽  
Base Superalloy

scholarly journals Characterisation of Residual Stress due to Fillet Rolling on Bolts Made of a Nickel Base Superalloy

2014 ◽  
Vol 996 ◽  
pp. 670-675 ◽  
Author(s):  
Wei Li ◽  
Shu Yan Zhang ◽  
Saurabh Kabra ◽  
Anton Tremsin ◽  
Brian Abbey ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Compressive Residual Stress ◽  
Hole Drilling ◽  
Nickel Base Superalloy ◽  
Residual Stress Field ◽  
Neutron Transmission ◽  
Incremental Hole Drilling ◽  
Nickel Base ◽  
Base Superalloy

This paper investigates residual stress due to fillet rolling on bolts made of ATI 718Plus® superalloy. Incremental hole drilling, neutron diffraction and neutron transmission have been used to assess residual stress near the bolt head fillet. A compressive residual stress field was identified in the first 0.5 mm from the surface. Post fillet rolling solution anneal can relieve the residual stress at the fillet.

Evolution of Internal Stress Field in Ni-Base Superalloy through Creep Deformation

2005 ◽  
pp. 619-622
Author(s):  
Katsushi Tanaka ◽  
T. Kajikawa ◽  
T. Ichitsubo ◽  
M. Osawa ◽  
Tadaharu Yokokawa ◽  
...  
Keyword(s):  
Stress Field ◽  
Internal Stress ◽  
Creep Deformation ◽  
Internal Stress Field ◽  
Base Superalloy

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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