Low Cycle Fatigue Behavior of Ti-6AI-2Sn-4Zr-6Mo: Part I. The Role of Microstructure in Low Cycle Crack Nucleation and Early Crack Growth

1982 ◽  
Vol 13 (2) ◽  
pp. 257-268 ◽  
Author(s):  
Yashwant Mahajan ◽  
Harold Margolin
Keyword(s):  
Crack Growth ◽  
Crack Nucleation ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue

Effect of Surface Recrystallization on the Low Cycle Fatigue Behavior of Directionally Solidified Superalloy DZ4 by In Situ SEM Studies

2012 ◽  
Vol 706-709 ◽  
pp. 2456-2461
Author(s):  
Xian Feng Ma ◽  
Hui Ji Shi
Keyword(s):  
Fatigue Life ◽  
Crack Growth ◽  
Shot Peening ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Directionally Solidified ◽  
Annealing Heat Treatment ◽  
Crack Growth Rates

The effect of recrystallization on the low cycle fatigue life of DZ4 directionally solidified superalloy was investigated for specimens with three different recrystallized layers, which were generated by shot peening (0.1MPa, 0.3MPa and 0.5MPa respectively) and a subsequent annealing heat treatment. The fatigue life showed a decrease for recrystallized specimens with shot-peening of 0.1 MPa and 0.3 MPa, and an unusual increase for that of 0.5MPa, in comparison with the original DZ4 specimen. In-situ SEM observations were performed on the short crack growth behaviors for both original and recrystallized specimens, which revealed the fracture mechanism and the interaction with microstructure. Quantitative analysis of fatigue crack growth rates rationalized the influence of recrystallization on the low-cycle fatigue life of DZ4.

Role of butter layer in low-cycle fatigue behavior of modified 9Cr and CrMoV dissimilar rotor welded joint

2014 ◽  
Vol 59 ◽  
pp. 165-175 ◽  
Author(s):  
Qingjun Wu ◽  
Fenggui Lu ◽  
Haichao Cui ◽  
Xia Liu ◽  
Peng Wang ◽  
...  
Keyword(s):  
Welded Joint ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue

Role of ultrasonic shot peening on low cycle fatigue behavior of 7075 aluminium alloy

2017 ◽  
Vol 103 ◽  
pp. 426-435 ◽  
Author(s):  
Vaibhav Pandey ◽  
K. Chattopadhyay ◽  
N.C. Santhi Srinivas ◽  
Vakil Singh
Keyword(s):  
Aluminium Alloy ◽  
Shot Peening ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Ultrasonic Shot Peening

Fatigue of AZ91E-T6 Cast Magnesium Alloy

1993 ◽  
Vol 115 (4) ◽  
pp. 391-397 ◽  
Author(s):  
D. L. Goodenberger ◽  
R. I. Stephens
Keyword(s):  
Fatigue Crack ◽  
Magnesium Alloy ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Mean Stress ◽  
Cycle Fatigue ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium

The purpose of this research was to obtain room temperature fatigue behavior of AZ91E-T6 cast magnesium alloy and to determine if commonly used models that depict fatigue behavior are applicable to this cast alloy. Axial strain-controlled fatigue behavior using cylindrical specimens were employed to determine low cycle fatigue behavior with strain ratios R = εmin/εmax = 0, −1, and −2. The conventional log-log total strain low cycle fatigue model properly represented the R = −1 axial fatigue data. Significant mean stress relaxation occurred for all R = 0 and −2 axial fatigue tests. However, for the smaller strain amplitude tests with R = 0, sufficient mean stresses were retained such that fatigue life was reduced. The mean strains/stresses had little influence on the cyclic stress-strain curve which exhibited cyclic strain hardening. Mean stress effects were analyzed using the Morrow, SWT and Lorenzo-Laird models and similar, but oftentimes nonconservative, calculations resulted. Region I and II fatigue crack growth behavior was determined using C(T) speciments with load ratios R = Pmin/Pmax = 0.05 and 0.5. Values of ΔKth and (ΔKth)eff were less than 1.5 MPa m and the Paris equation slopes were between 3.3 and 3.9. Quasi-cleavage was predominant for both fatigue crack growth and final fracture regions. The commonly used low cycle fatigue and fatigue crack growth models appear to reasonably represent most of the results with this AZ91E-T6 cast magnesium alloy.

scholarly journals The Role of Simulated HTGR Helium on the Low Cycle Fatigue Behavior of Ni-Cr-W Alloys

1985 ◽  
Vol 71 (1) ◽  
pp. 92-99
Author(s):  
Kazuo FURUYA ◽  
Kouichi SATO ◽  
Toshio KAINUMA ◽  
Heitarou YOSHIDA
Keyword(s):  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue
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