Influences of ruthenium and crystallographic orientation on creep behavior of aluminized nickel-base single crystal superalloys

2014 ◽  
Vol 592 ◽  
pp. 143-152 ◽  
Author(s):  
F.H. Latief ◽  
K. Kakehi ◽  
H. An-Chou Yeh ◽  
H. Murakami
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Crystallographic Orientation ◽  
Nickel Base

Creep in Ordered Nickel Base Alloys

1984 ◽  
Vol 39 ◽  
Author(s):  
P. R. Strutt ◽  
B. H. Kear
Keyword(s):  
Creep Behavior ◽  
Creep Deformation ◽  
Crystallographic Orientation ◽  
Deformation Behavior ◽  
Strong Influence ◽  
Deformation Mode ◽  
Two Phase ◽  
Effects Of Temperature ◽  
Nickel Base ◽  
Relative Creep

ABSTRACTThis paper examines the fundamentals of deformation behavior in ordered y′ (Ni3Al), β (NiAl) and β′ (Ni2AITi) phases, and specific two phase y/y′ and B/B′ alloys. The relative creep strengths of these ordered nickel-base alloys are discussed. Differences in creep behavior are explained in terms of the effects of temperature, crystallographic orientation and alloying on creep deformation mode. In particular, it is shown that trace additions of boron and carbon to y/y′ alloys, or deviations from stoichiometry in β′ -type alloys can exert a strong influence on creep behavior.

The Microstructure and Creep Behavior of a [001] Orientation Single Crystal Nickel-Base Superalloy

2011 ◽  
Vol 4 (11) ◽  
pp. 3696-3700
Author(s):  
Yong Su ◽  
Sugui Tian ◽  
Huichen Yu ◽  
Jun Xie ◽  
Lili Yu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

Strengthening Mechanisms in Some Single-Crystal Superalloys

2005 ◽  
Vol 475-479 ◽  
pp. 623-626 ◽  
Author(s):  
Yuichiro Koizumi ◽  
Hiroshi Harada
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Creep Behavior ◽  
Lattice Misfit ◽  
Alloying Elements ◽  
Strengthening Mechanisms ◽  
Interfacial Dislocation ◽  
Nickel Base

The creep behavior and microstructure of several nickel-base single-crystal superalloys after high-temperature low-stress creep have been investigated. These alloys were designed with varying content of the alloying elements Mo and Ru. At 1100°C and 137 MPa, the large g/g¢ lattice misfit in negative with the addition of Mo leads to the formation of dense interfacial dislocation networks. These dislocation networks are effective to strengthen the alloys during creep by preventing the penetration of the g dislocations into the g¢ phase.

scholarly journals Influences of Holes Arrangement on Creep Characteristic of Nickel-Base Single Crystal Alloy Blade Cooling Holes

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Lei Li ◽  
Liangbo Ao ◽  
Gongnan Xie ◽  
Xinmei Wang ◽  
Gang Cao
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Film Cooling ◽  
Horizontal Distance ◽  
Blade Cooling ◽  
Single Crystal Alloy ◽  
Creep Time ◽  
Creep Characteristic ◽  
Cooling Technology ◽  
Nickel Base

Film cooling technology is developed to enhance the temperature resistant of nickel-base single crystal alloy blade. The shape, dimension, and arrangement of cooling holes impact the blade strength and life grievously. In this paper, the influences of holes arrangement on creep characteristic of cooling holes in the plate sample are investigated. The constitutive model for creep considering both cavitation and degradation damage is developed to predict the creep behavior of cooling holes. Results show that there are stress interferences among cooling holes. The distance and radius of the cooling holes impact the creep behavior of cooling holes seriously. Decreasing horizontal distance of the holes results in creep time reducing. On the contrary, increasing the vertical distance of the holes makes the creep time reduced.

Creep Behavior of a Single Crystal Nickel-Based Superalloy Containing Re/Ru at 1100°C/137MPa

2015 ◽  
Vol 816 ◽  
pp. 551-556
Author(s):  
Su Gui Tian ◽  
Bao Shuai Wang ◽  
Xin Ding ◽  
De Long Shu ◽  
Jing Wu
Keyword(s):  
Single Crystal ◽  
Creep Behavior ◽  
Creep Resistance ◽  
Nickel Base Superalloy ◽  
Nickel Based Superalloy ◽  
Deformation Feature ◽  
Heat Treated ◽  
Initiation And Propagation ◽  
Nickel Base ◽  
Base Superalloy

Creep behavior of a heat treated single crystal nickel base superalloy containing Re/Ru under the test condition of 1100°C/137MPa high temperatures was investigated. The experimental results showed that the segregation extent of elements in the dendrite and inter-dendrite regions of single crystal superalloy decreases by heat treatment at high temperature. The creep life of the alloy at 1100°C/137MPa was measured to be 321 h displaying a better creep resistance. Wherein, significant amount of fine cubiodal γ′ particles precipitated in the γ matrix channels are considered to be the main reason of the alloy having the better creep resistance. The deformation feature of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. But in the latter stage of creep, the deformation feature of the alloy is dislocations shearing into the rafted γ′ phase. As creep goes on, the main / secondary slipping dislocations in the alloy are alternately activated to result in the initiation and propagation of the cracks along the interface of the rafted γ′/γ phase up to fracture, which is thought to be the fracture mechanism of the alloy during creep.

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