Structural changes and mechanisms of thermal fatigue crack generation in high-temperature alloys with coatings

1993 ◽  
Vol 25 (12) ◽  
pp. 883-887 ◽  
Author(s):  
R. I. Kuriat ◽  
S. G. Khaustova
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Thermal Fatigue ◽  
Structural Changes ◽  
Thermal Fatigue Crack ◽  
Crack Generation ◽  
High Temperature Alloys ◽  
Fatigue Crack Generation

Stress Intensity Factor of Thermal Fatigue Crack in High Temperature

2012 ◽  
Vol 581-582 ◽  
pp. 677-680
Author(s):  
Ming Yan ◽  
Hao Chuan Li ◽  
Lin Li
Keyword(s):  
Stress Intensity Factor ◽  
Fatigue Crack ◽  
High Temperature ◽  
Stress Intensity ◽  
Low Temperature ◽  
Intensity Factor ◽  
Thermal Fatigue ◽  
Kinematic Hardening ◽  
Temperature Cycle ◽  
Thermal Fatigue Crack

Stress intensity factor of thermal fatigue crack was calculated within one cycle by using finite element method in consideration of the multi-linear kinematic hardening characteristic of a material. The affection of loading sequence to stress intensity factor was studied under circularly variational temperature by comparing to that in one cycle. The low temperature cycle can not affect the stress intensity factor of latter cycles with high temperature; but high temperature cycle can affect the stress intensity factor of latter cycles with low temperature, and make it be equal to that of the high temperature cycle.

Thermal Fatigue Crack Initiation of Laser Deposited High-temperature Titanium Alloy Ti60A in 20–700 °C

2013 ◽  
Vol 32 (4) ◽  
pp. 331-337 ◽  
Author(s):  
A.L. Zhang ◽  
D. Liu ◽  
H.M. Wang
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
High Temperature ◽  
Crack Initiation ◽  
Thermal Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Thermal Fatigue Crack ◽  
Fatigue Process ◽  
Thermal Fatigue Cracks

AbstractThermal fatigue damage of high-temperature titanium alloys is of great concern for severe temperature-fluctuating environment, and the thermal fatigue crack initiation stage plays a crucial role in thermal fatigue life. In present study, thermal fatigue tests keeping 55 seconds at 700 °C followed by water cooling 15 seconds at 20 °C were performed for the laser deposited high-temperature titanium alloy Ti60A (Ti5.54Al3.38Sn3.34Zr0.37Mo0.46Si). Thermal fatigue cracks initiate after 800 thermal fatigue cycles with a length of 20 µm. Subsequently numerous cracks grow to 500 µm and cause severe degradation after 1000 cycles. To investigate the crack initiation behavior, microstructural changes during thermal fatigue process were examined by OM, SEM, EPMA and TEM. Thermal fatigue cracks initiate preferably at grain boundaries, α/β interfaces, microvoids, and abnormal coarsened α produced by oxygen interstitial solution. Mechanisms of thermal fatigue crack initiation are related to compatibility of local deformation and microstructural changes during thermal fatigue process.

Evaluation of Susceptibility to Thermal Fatigue Cracking in High Temperature Alloys for Refinery Olefin Applications

2021 ◽  
Author(s):  
Yuxiang Zhang ◽  
Ryan J. Buntain ◽  
Jacob D. Edwards ◽  
Boian Alexandrov ◽  
Jorge Penso
Keyword(s):  
High Temperature ◽  
Thermal Fatigue ◽  
Fatigue Cracking ◽  
High Temperature Alloys
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