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.

Influence of Etchants on Phase Morphology of Casting Ni-Based Superalloy

2014 ◽  
Vol 887-888 ◽  
pp. 366-369
Author(s):  
Juan Juan Li ◽  
Shu Jun Zang ◽  
Jian Bin Zhang
Keyword(s):  
Grain Boundary ◽  
Phase Morphology ◽  
Nickel Base Superalloy ◽  
Mixed Solution ◽  
Dendrite Structure ◽  
Etching Solution ◽  
Metallic Compounds ◽  
Nickel Base ◽  
Base Superalloy

K4169 is the Nickel-base superalloy that is the most widely used in the turbine components. The article selects three kinds of etching solution to corrode, in order to achieve the purpose that studies on its morphology. Etchant1 is the mixed solution of 15mlHCl, 10mlAcetic acid, 5mlHNO3and 2drop glycerin. Etchant2 is the mixed solution of 3ml glycerin, 3mlHCl, 1ml HNO3. Etchant 3 is the mixed solution of 20mlHNO3, 60mlHCl. The results showed that we can mainly observe strengthened phase γ'' (Ni3(Ti, Al)) and matrix γ (Fe-Ni-Cr) phase with etchant1 to corrode. Using the etchant2 to corrode, we can clearly see its dendrite structure. Using the etchant3 to corrode, we can obverse its grain boundary that includes white inter-metallic compounds. We also respectively discussed the K4169 morphology when magnifications are 200times and 500times.

About the possibility of grain boundary engineering via hot-working in a nickel-base superalloy

2010 ◽  
Vol 62 (11) ◽  
pp. 851-854 ◽  
Author(s):  
N. Souaï ◽  
N. Bozzolo ◽  
L. Nazé ◽  
Y. Chastel ◽  
R. Logé
Keyword(s):  
Grain Boundary ◽  
Hot Working ◽  
Nickel Base Superalloy ◽  
Grain Boundary Engineering ◽  
Nickel Base ◽  
Base Superalloy

Precipitate-Free Zones at the Grain Boundary of a Bicrystal of the Nickel-Base Superalloy Nimonic PE16

1993 ◽  
Vol 126-128 ◽  
pp. 443-446 ◽  
Author(s):  
Harald Rösner ◽  
K. Neuking ◽  
Matthias Kolbe ◽  
E. Nembach
Keyword(s):  
Grain Boundary ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Coarsening Kinetics of Grain Boundary in a Cast Nickel Base Superalloy during Long Term Aging

PRICM ◽  
2013 ◽  
pp. 317-325
Author(s):  
Qiang Zeng ◽  
Minghan Zhao ◽  
Ping Yan ◽  
Juntao Li ◽  
Jingchen Zhao ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Nickel Base Superalloy ◽  
Coarsening Kinetics ◽  
Nickel Base ◽  
Kinetics Of ◽  
Base Superalloy
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