scholarly journals Crack growth in single crystal nickel base superalloys under isothermal and thermomechanical fatigue

2019 ◽  
Author(s):  
Frans Palmert
Keyword(s):  
Single Crystal ◽  
Crack Growth ◽  
Thermomechanical Fatigue ◽  
Nickel Base Superalloys ◽  
Nickel Base

In Situ Imaging of High Cycle Fatigue Crack Growth in Single Crystal Nickel-Base Superalloys by Synchrotron X-Radiation

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Liu Liu ◽  
Naji S. Husseini ◽  
Christopher J. Torbet ◽  
Divine P. Kumah ◽  
Roy Clarke ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Single Crystal ◽  
Real Time ◽  
Crack Growth ◽  
Fatigue Cracks ◽  
X Ray ◽  
Ultrasonic Fatigue ◽  
Nickel Base Superalloys ◽  
Nickel Base

A novel X-ray synchrotron radiation approach is described for real-time imaging of the initiation and growth of fatigue cracks during ultrasonic fatigue (f=20kHz). We report here on new insights on single crystal nickel-base superalloys gained with this approach. A portable ultrasonic fatigue instrument has been designed that can be installed at a high-brilliance X-ray beamline. With a load line and fatigue specimen configuration, this instrument produces stable fatigue crack propagation for specimens as thin as 150μm. The in situ cyclic loading/imaging system has been used initially to image real-time crystallographic fatigue and crack growth under positive mean axial stress in the turbine blade alloy CMSX-4.

A continuum model for the creep of single crystal nickel-base superalloys

2005 ◽  
Vol 53 (3) ◽  
pp. 669-679 ◽  
Author(s):  
Sharat C. Prasad ◽  
I.J. Rao ◽  
K.R. Rajagopal
Keyword(s):  
Single Crystal ◽  
Continuum Model ◽  
Nickel Base Superalloys ◽  
Nickel Base

Anisotropic Life Prediction for Single Crystal Nickel-Base Flat Plate with a Hole

2014 ◽  
Vol 891-892 ◽  
pp. 1033-1038
Author(s):  
Cheng Li Dong ◽  
Hui Chen Yu ◽  
Ying Li
Keyword(s):  
Single Crystal ◽  
Flat Plate ◽  
Life Prediction ◽  
Failure Strain ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
The Finite Element Method ◽  
Nickel Base Superalloys ◽  
Nickel Base ◽  
Elastoplastic Constitutive Model

The material properties of single crystal (SC) superalloys are orientation-dependent. To fully exploit the material capacity, the life modeling needs to consider the anisotropy. In the present study the life modeling of SC nickel-base superalloys is considered by employing the modified Mücker's anisotropic theory in which a Hill type function is utilized for describing the anisotropic failure. Strain-controlled low cycle fatigue (LCF) experiments of SC nickel-base superalloys at different crystallographic orientations (i.e.[00, [01 and [11) under high temperatures (i.e.760°C) are carried out to verify the modeling availability for the modified Mücker's anisotropic theory. Further, based on the stress-strain field obtained by the anisotropic elastoplastic constitutive model coupled with the finite element method (FEM), the modified Mücker's anisotropic theory is employed to predict the fatigue life for SC flat plate with a hole.

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