Crack Initiation in an Aluminide Coated Single Crystal During Thermomechanical Fatigue

2009 ◽  
pp. 68-68-14 ◽  
Author(s):  
JM Martínez-Esnaola ◽  
M Arana ◽  
J Bressers ◽  
J Timm ◽  
A Martín-Meizoso ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Single Crystal ◽  
Thermomechanical Fatigue

Evaluation of Thermomechanical Fatigue Crack Initiation in a Single-Crystal Superalloy

2015 ◽  
Author(s):  
Daniel Leidermark
Keyword(s):  
Crack Initiation ◽  
Single Crystal ◽  
Good Description ◽  
Plastic Anisotropy ◽  
Fatigue Crack Initiation ◽  
Thermomechanical Fatigue ◽  
Nickel Base Superalloy ◽  
Critical Plane ◽  
Post Process ◽  
Crystallographic Slip

In this study the thermomechanical fatigue (TMF) crack initiation of the single-crystal nickel-base superalloy MD2 is investigated and evaluated. A series of experiments are performed of smooth specimens loaded in the nominal [001] and [011] crystal orientations, subjected to both in-phase and out-of-phase TMF loading conditions. Considering the inherent internal structure of crystallographic slip planes in single-crystals, a number of critical-plane approaches are evaluated to enable a good description of the TMF crack initiation. These are evaluated using finite element simulations and a post-process, in which crystallographic entities are extracted and compared to the experimental TMF life. A good correlation is achieved for two of the critical-plane approaches. These are able to predict the TMF crack initiation taking into account the elastic and plastic anisotropy, the tension/compression asymmetry and the creep relaxation present in the material.

Thermomechanical Fatigue of Single-Crystal Superalloys: Influence of Composition and Microstructure

2012 ◽  
pp. 369-377 ◽  
Author(s):  
Johan J. Moverare ◽  
Mikael Segersäll ◽  
Atsushi Sato ◽  
Sten Johansson ◽  
Roger C. Reed
Keyword(s):  
Single Crystal ◽  
Thermomechanical Fatigue
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