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Fatigue Crack Propagation in Metastable Titanium Alloys

Author : A. Raith

Publisher :

Page : 68 pages

File Size : 40,8 MB

Release : 1984

Category : Titanium alloys

ISBN :

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Book Description

The fatigue crack growth rate tests of water quenched Corona-5 (Ti-4.5Al-1.5Cr-5Mo) and Ti-6Al-4V alloy were conducted in air at room temperature. The effect of the presence of the metastable retained beta phase on the fatigue crack growth rate was examined in this research. The specimens were heat treated and water quenched to have unstable beta phase that could be transformed to martensite during the fatigue crack growth testing. As quenched specimens were compared with specimens in the mill annealed condition. The fatigue crack growth rates of all the specimens were in the same order of magnitude regardless of the heat treatment. From this research it was shown that in Corona-5 and Ti-6Al-4V alloys the fatigue crack growth rates were not affected by the strain induced martensitic transformation.



Fatigue Crack Propagation of Metastable Beta Titanium-Vanadium Alloys

Author : Saghana B. Chakrabortty

Publisher :

Page : 37 pages

File Size : 37,25 MB

Release : 1978

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ISBN :

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Book Description

The fatigue crack propagation behavior of three titanium-vanadium alloys (24, 28 and 32 wt.% V) which have (tensile) deformation modes ranging from coarse twinning to wavy and planar slip has been measured in laboratory air and correlated with their low cycle fatigue properties and microstructure. The fatigue crack growth rate of alloys with similar microstructures but different deformation modes, and of alloys with similar deformation modes but different microstructures have been compared. Increasing the deformation barrier mean free path and improving low cycle fatigue properties has been observed to reduce the fatigue crack growth rate at low and intermediate Delta K levels. The fatigue crack growth data have been compared with that calculated from equations which use microstructure and low cycle fatigue parameters. The predictive capability of these equations which contain only measurable parameters has been found to be quite adequate. (Author).







The Effect of Overload on Fatigue Crack Propagation in Metastable Beta Titanium-Vanadium Alloys

Author : Eui Whee Lee

Publisher :

Page : 39 pages

File Size : 16,31 MB

Release : 1980

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ISBN :

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Book Description

The crack retardation response due to single- and multiple-cycle overload of two titanium vanadium alloys (24 and 32 wt. pct. V) has been studied. It has been observed that the degree of retardation depends upon the vanadium content of the alloy, the load ratio, the number of overload cycles and the magnitude of the peak load. Fractographic observations show that the cracking mode may be changed in the overload affected zone from that in the preoverload region. These results seem to incidcate that the retardation behavior is mainly due to the compressive residual stresses arising as a consequence of the overload. The degree of retardation depends not only on the loading variables, but also on the material parameters like the monotonic and cyclic deformation behavior, and the stress-strain response. (Author).











Fatigue Crack Propagation in Titanium Alloys

Author : A. J. McEvily

Publisher :

Page : 13 pages

File Size : 29,84 MB

Release : 1975

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ISBN :

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Book Description

The report summarizes the research accomplishments in the first year's program of a study of fatigue crack growth in Ti-6Al-4V alloys. Fatigue crack growth rates have been determined in the mean threshold regions, and data for the effect of mean stress on the threshold level indicate that the dependency may be interpretable in terms of a constrant crack opening criterion. Additional work on high cycle fatigue indicates that there are two regions for the Coffin-Manson relation and that cyclically developed residual stresses may be responsible for this behavior.