X-ray Microtomographic Characterisation of Porosity and its Influence on Fatigue Crack Growth

2006 ◽  
Vol 8 (6) ◽  
pp. 476-479 ◽  
Author(s):  
P. Li ◽  
P. D. Lee ◽  
T. C. Lindley ◽  
D. M. Maijer ◽  
G. R. Davis ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
X Ray

Interfacial Composition Measurements in Complex Ni-Base Superalloys

1996 ◽  
Vol 458 ◽  
Author(s):  
E. L. Hall ◽  
J. Bentley
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Grain Boundary ◽  
Crack Growth ◽  
Time Dependent ◽  
Alloying Elements ◽  
Second Phase ◽  
Slow Cooling ◽  
X Ray ◽  
Boundary Composition

ABSTRACTIn this study, three different Ni-base superalloy / heat treatment combinations are studied in an attempt to assess the role of grain boundary morphology, composition, and phase distribution on mechanical properties, particularly time-dependent fatigue crack growth. The alloys chosen include one in which crack growth can be slowed by slow-cooling, and one in which crack growth is slow in the fast-cooled state. Both x-ray spectroscopy and energy-filtered imaging in the analytical electron microscope were used to measure grain boundary composition. The x-ray spectroscopy showed some enhancement of Cr, Mo, and W in the γ matrix at grain boundaries in the fast-cooled state, which was not present after slow cooling. Energy-filtered imaging showed no significant enhancement in alloying elements at interfaces in any of the samples studied. The results did show the tendency for the γ matrix to quickly equilibrate by second-phase precipitation, and a preference to avoid γ ‘- γ’ interfaces. The conclusions of this study are that time-dependent fatigue crack growth behavior in these alloys cannot be completely explained on the basis of grain boundary composition of major alloying elements.

Measuring overload effects during fatigue crack growth in bainitic steel by synchrotron X-ray diffraction

2015 ◽  
Vol 71 ◽  
pp. 11-16 ◽  
Author(s):  
P. Lopez-Crespo ◽  
A. Steuwer ◽  
T. Buslaps ◽  
Y.H. Tai ◽  
A. Lopez-Moreno ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Bainitic Steel ◽  
X Ray Diffraction ◽  
X Ray

Combining Fractography with High-Energy x-Ray Diffraction to Study Fatigue Crack Growth in Ti-6Al-4V

JOM ◽  
2019 ◽  
Vol 72 (1) ◽  
pp. 91-100
Author(s):  
A. L. Pilchak ◽  
A. J. Beaudoin ◽  
D. C. Pagan ◽  
K. Chatterjee ◽  
K. Swartz ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray

A Study on Fatigue Crack Propagation Properties Using the X-Ray Diffraction Method

2008 ◽  
Vol 575-578 ◽  
pp. 1162-1169
Author(s):  
Md. Anowar Hossian ◽  
Man Bae Lim ◽  
Sun Chul Huh ◽  
Won Jo Park
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Diffraction Method ◽  
Stress Effect ◽  
X Ray Diffraction ◽  
X Ray

This study evaluated fatigue crack growth characteristics, Besides consider compressive residual stress effect and verified the most suitable shot peening velocity. Fatigue crack growth delay effect was compressive residual stress, but over peening did action projecting velocity that accelerate fatigue crack growth rate. X-ray diffraction technique according to crack length direction was applied to fatigue fractured surface. Fracture mechanics parameters could be estimated by the measurement of X-ray parameters, and the fractography observation was performed using a scanning electron microscope (SEM) for fatigue fracture surface. As the shot peening velocity increases, striation width increased. The changes in X-ray material parameters described above are directly related to the process of fatigue until the initiation of fatigue crack and X-ray diffraction pattern is thought that failure prediction with stress distribution is possible.

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