Journal ArticleDOI
Titanium alloy fatigue fracture facet investigation by selected area electron channeling
David L. Davidson,D. Eylon +1 more
TLDR
In this paper, the same authors examined the fracture surfaces of IMI-685 and Ti-11 with and without a 5 min load dwell and found that the crystallographic planes of the facets were near basal for the latter and more random for the former.Abstract:
Flat regions (facets) found on fracture surfaces caused by initiation and propagation of fatigue cracks through the titanium alloys IMI-685 tested with and without a 5 min load dwell and Ti-11 have been examined using selected area electron channeling. The crystallographic planes of the facets have been identified as being near basal for the IMI-685 and more random for the Ti-11. None of the dwell specimens showed a pure basal facet orientation. The plastic zone size was also assessed and found to correlate approximately with stress intensity, allowing confirmation of crack initiation sites as determined by fractography. One case of beta to alpha-beta transformation crystallography is also examined. A partial channeling map for titanium is presented.read more
Citations
More filters
Journal ArticleDOI
Influence of microstructure on high-cycle fatigue of Ti-6Al-4V: Bimodal vs. lamellar structures
TL;DR: In this article, the authors examined how the overall resistance to high-cycle fatigue in Ti-6Al-4V compares between the bimodal microstructure and a coarser lamellar (β-annealed) micro-structure.
Journal ArticleDOI
The role of microtexture on the faceted fracture morphology in Ti–6Al–4V subjected to high-cycle fatigue
TL;DR: In this article, fractographic investigations were conducted on bimodal Ti-6Al-4V plate, including transmission electron microscopy to determine the mechanism of fatigue facet formation and electron backscattered diffraction to examine the underlying macrozone structures.
Journal ArticleDOI
Observations on the faceted initiation site in the dwell-fatigue tested Ti-6242 alloy : Crystallographic orientation and size effects
TL;DR: In this paper, an electron backscattered diffraction (EBSD) characterization technique was used to study fracture in Ti-6242 under dwell-fatigue loading conditions, and the results were used to better understand the role of size of microtextured regions in determining which crack will outgrow the other cracks to become the dominant crack that leads to eventual fracture.
Journal ArticleDOI
Microstructural Influences on Very-High-Cycle Fatigue-Crack Initiation in Ti-6246
Christopher J. Szczepanski,Christopher J. Szczepanski,Sushant K. Jha,J. M. Larsen,J. W. Jones +4 more
TL;DR: In this article, the authors examined the mechanisms of fatigue-crack formation by quantifying critical microstructural features observed in the fatiguecrack initiation region, and found that the fracture surface near the fatigue crack-initiation site was crystallographic in nature.
Journal ArticleDOI
Slip transfer and deformation structures resulting from the low cycle fatigue of near-alpha titanium alloy Ti-6242Si
TL;DR: In this article, a near-alpha titanium alloy (Ti6242Si) was subjected to low cycle fatigue loading at room temperature, and deformation occurred primarily by planar slip, localized into slip bands in the primary alpha.
References
More filters
Journal ArticleDOI
On the process of transition of the cubic-body-centered modification into the hexagonal-close-packed modification of zirconium
TL;DR: In this paper, the process of transition of the cubic-body-centred modification into the hexagonal-close-packed modification of zirconium can be described by means of a combination of shearing- and dilatation-processes parallel to definite crystallographic directions.
Journal ArticleDOI
Fatigue behavior of beta processed titanium alloy IMI 685
D. Eylon,J. A. Hall +1 more
TL;DR: In this article, the low cycle fatigue behavior of IMI-685 alloy with β-processed and β-annealed microstructures was investigated, and it was shown that material with large colony structure of α-platelets oriented in the same direction, resulting from insufficient β-work and slow cooling rate from the β-phase region, exhibited lower fatigue strength than material with basketweave arrangement of the αplatelets.
Journal ArticleDOI
Microstructure and mechanical properties relationships in the Ti-11 alloy at room and elevated temperatures
TL;DR: In this paper, twelve different combinations of hot die forging and heat treatment, in the α+β and β phase regions, were investigated, and the resulting heat treated forgings were classified into four distinct categories based on their microstructural appearance.
Journal ArticleDOI
Observations of an interface phase in the α/β boundaries in titanium alloys
C. G. Rhodes,James C. Williams +1 more
Journal ArticleDOI
Fatigue cracking characteristics of β-annealed large colony Ti-11 alloy
D. Eylon,P. J. Bania +1 more
TL;DR: In this article, the fracture is related to a shear mechanism across the colonies from the initiation stage through the overload fracture, and the density of the shear bands increased with increasing stress intensity.
Related Papers (5)
Dwell-sensitive fatigue under biaxial loads in the near-alpha titanium alloy IMI685
W.J. Evans,Martin Bache +1 more