scholarly journals Damage Mechanisms in Bithermal and Thermomechanical Fatigue of Haynes 188

2009 ◽  
pp. 126-126-18
Author(s):  
S Kalluri ◽  
GR Halford
Keyword(s):  
Thermomechanical Fatigue ◽  
Damage Mechanisms

scholarly journals On Localized Deformation and Recrystallization as Damage Mechanisms during Thermomechanical Fatigue of Single Crystal Nickel-Based Superalloys

2011 ◽  
Vol 278 ◽  
pp. 357-362 ◽  
Author(s):  
Johan J. Moverare ◽  
Atsushi Sato ◽  
Sten Johansson ◽  
Magnus Hasselqvist ◽  
Roger C. Reed ◽  
...  
Keyword(s):  
Single Crystal ◽  
Power Plants ◽  
Deformation Behaviour ◽  
Shear Bands ◽  
Thermomechanical Fatigue ◽  
Deformation Bands ◽  
Localized Deformation ◽  
Damage Mechanisms ◽  
Tcp Phases

Thermomechanical fatigue (TMF) in superalloys is growing in importance due to the introduction of advanced cooling systems but also due to the changes in demand and competition within the power generation market; this is requiring many power plants to operate under cyclic conditions. In this paper the TMF behaviour of three different single crystal nickel-based superalloys are compared. It is demonstrated that the deformation and damage mechanisms occurring during TMF are rather different from those traditionally reported for creep or isothermal fatigue. In all cases examined, the deformation is localized within a rather small number of deformation bands. While these bands were found to consist mainly of micro-twins in some alloys, in others they might be better described as slip or shear bands. Furthermore, in some circumstances these bands are prone to recrystallization. In CMSX-4, the intersection points of twins of different orientation act as initiation sites for this process. In the SCA425 alloy – of smaller gamma’ content, lower creep resistance and less great oxidation resistance – twinning is observed infrequently; however the deformation is still very localized and in the distorted gamma-gamma’ microstructure, along the shear bands, recrystallization is observed. Furthermore the recrystallization is enhanced by oxidation due to the development of a gamma’-depleted zone. In CMSX-4, TCP phases precipitated during long term ageing cause a more dispersed deformation behaviour which prevents recrystallization. Our findings confirm the importance of an inhomogeneous microstructure for good TMF resistance.

scholarly journals The deformation and damage mechanisms during thermomechanical fatigue (TMF) in IN792

2011 ◽  
Vol 10 ◽  
pp. 189-194 ◽  
Author(s):  
Jan Kanesund ◽  
Johan Moverare ◽  
Sten Johansson
Keyword(s):  
Thermomechanical Fatigue ◽  
Damage Mechanisms

Phase-angle effects on damage mechanisms of thermal barrier coatings under thermomechanical fatigue

2001 ◽  
Vol 45 (7) ◽  
pp. 859-865 ◽  
Author(s):  
B Baufeld ◽  
E Tzimas ◽  
P Hähner ◽  
H Müllejans ◽  
S.D Peteves ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Phase Angle ◽  
Thermomechanical Fatigue ◽  
Thermal Barrier ◽  
Damage Mechanisms ◽  
Barrier Coatings

Thermomechanical fatigue—damage mechanisms and mechanism-based life prediction methods

Sadhana ◽  
2003 ◽  
Vol 28 (1-2) ◽  
pp. 147-165 ◽  
Author(s):  
H. -J. Christ ◽  
A. Jung ◽  
H. J. Maier ◽  
R. Teteruk
Keyword(s):  
Fatigue Damage ◽  
Life Prediction ◽  
Thermomechanical Fatigue ◽  
Prediction Methods ◽  
Damage Mechanisms
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