Elevated Temperature Fatigue-Creep Behavior of Nickel-Base Superalloy IN 625

2009 ◽  
pp. 470-470-15 ◽  
Author(s):  
T Bui-Quoc ◽  
R Gomuc ◽  
A Biron ◽  
HL Nguyen ◽  
J Masounave
Keyword(s):  
Elevated Temperature ◽  
Creep Behavior ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

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

Effect of hafnium on creep behavior of a corrosion resistant nickel base superalloy

2010 ◽  
Vol 527 (6) ◽  
pp. 1548-1554 ◽  
Author(s):  
J.S. Hou ◽  
J.T. Guo ◽  
Y.X. Wu ◽  
L.Z. Zhou ◽  
H.Q. Ye
Keyword(s):  
Creep Behavior ◽  
Nickel Base Superalloy ◽  
Corrosion Resistant ◽  
Nickel Base ◽  
Base Superalloy

Strain and Damage-Based Analytical Methods to Determine the Kachanov–Rabotnov Tertiary Creep-Damage Constants

2011 ◽  
Vol 21 (8) ◽  
pp. 1186-1201 ◽  
Author(s):  
Calvin M. Stewart ◽  
Ali P. Gordon
Keyword(s):  
Creep Behavior ◽  
Creep Deformation ◽  
Analytical Methods ◽  
Numerical Optimization ◽  
Creep Damage ◽  
Tertiary Creep ◽  
Nickel Base Superalloy ◽  
Trial And Error ◽  
Nickel Base ◽  
Base Superalloy

In the power generation industry, the goal of increased gas turbine efficiency has led to increased operating temperatures and pressures necessitating nickel-base superalloy components. Under these conditions, the tertiary creep regime can become the dominant form of creep deformation. In response, the classical Kachanov–Rabotnov coupled creep-damage constitutive model is often used to predict the creep deformation and damage of Ni-base superalloys. In this model, the secondary creep behavior can be determined through analytical methods while the tertiary creep behavior is often found using trial and error or numerical optimization. Trial and error may produce no constants. Numerical optimization can be computationally expensive. In this study, a strain-based and damage-based approach to determine the tertiary creep behavior of nickel-base superalloys has been developed. Analytically determined constants are found for a given nickel-base superalloy. Creep deformation and damage evolution curves are compared. Methods to deal with stress dependence are introduced and studied.

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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