Effect of secondary dendrite arm spacing on the section size-dependent creep strength of a nickel-base superalloy

1994 ◽  
Vol 13 (10) ◽  
pp. 734-737 ◽  
Author(s):  
A. Baldan
Keyword(s):  
Creep Strength ◽  
Nickel Base Superalloy ◽  
Secondary Dendrite Arm Spacing ◽  
Size Dependent ◽  
Dendrite Arm Spacing ◽  
Section Size ◽  
Nickel Base ◽  
Base Superalloy

scholarly journals Relationship between Creep Strength and γ' Size in a Directionally Solidified Nickel-base Superalloy

1987 ◽  
Vol 73 (2) ◽  
pp. 364-371 ◽  
Author(s):  
Takeshi SUEMITSU ◽  
Shoji TANAKA ◽  
Junzo FUJIOKA ◽  
Yukio NISHIYAMA
Keyword(s):  
Creep Strength ◽  
Nickel Base Superalloy ◽  
Directionally Solidified ◽  
Nickel Base ◽  
Base Superalloy

The effects of orientation and thickness on the notch-tensile creep strength of single crystals of a nickel-base superalloy

1985 ◽  
Vol 16 (8) ◽  
pp. 1457-1466 ◽  
Author(s):  
K. Sugimoto ◽  
T. Sakaki ◽  
T. Horie ◽  
K. Kuramoto ◽  
O. Miyagawa
Keyword(s):  
Single Crystals ◽  
Creep Strength ◽  
Tensile Creep ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
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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