Effect of microstructure on notch fatigue properties of Ti-6Al-4V

Eylon, D.; Pierce, C. M.

doi:10.1007/bf02644046

Cited by 107 publications

(29 citation statements)

References 5 publications

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“…Smaller sizes of colony and prior β grain in the β-annealed Ti64 specimen increase the resistance to HCF by reducing effective slip length, as in the mill-annealed counterpart (Lütjer-ing 1998;Ziaja et al 2001;Lucas and Konieczny 1971;Bowen and Stubbington 1973;Demulsant and Mendez 1995). The narrower aligned α platelets within colonies can further suppress the crack initiation by slip band cracking, since the crack needs to cross through more of the β ribs in the aligned α platelets (Eylon and Pierce 1976;Bania et al 1982;Ruppen et al 1979). As in the mill-annealed Ti64 specimen, colony boundaries and prior β grain boundaries in the β-annealed specimen can act as microstructural barriers for crack to grow, improving the resistance to HCF.…”

Section: Methodsmentioning

confidence: 99%

High cycle fatigue and fatigue crack propagation behaviors of β-annealed Ti-6Al-4V alloy

Jeong

Kwon

Goto

et al. 2017

Int J Mech Mater Eng

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Background: The effect of β annealing on high cycle fatigue (HCF) and fatigue crack propagation (FCP) behaviors of Ti64 alloy were examined, and the results were compared to those of mill-annealed counterpart. Methods: The tensile tests, stress-controlled HCF tests, and FCP tests were conducted, and the fractographic and micrographic analyses were performed before and after the tests. Results: The β-annealed Ti64 specimen showed inferior HCF properties as compared to the mill-annealed counterpart, as a result of lower yield strength. On the other hand the resistance to FCP of β-annealed Ti64 specimen was higher than that of mill-annealed counterpart in low and intermediate ΔK regime. Conclusions: Relatively easy fatigue crack initiation at the colony boundaries of β-annealed Ti64 specimen reduce the resistance to HCF. The resistance to FCP of β-annealed Ti64 specimen increased significantly particularly in low ΔK regime along with severe crack branching and deflection.

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Section: Methodsmentioning

confidence: 99%

High cycle fatigue and fatigue crack propagation behaviors of β-annealed Ti-6Al-4V alloy

Jeong

Kwon

Goto

et al. 2017

Int J Mech Mater Eng

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“…With respect to titanium alloys, there have been several studies which have investigated the effect of small artificial defects such as holes and notches of various sizes on the fatigue properties [3][4][5]. Some of these studies [4,5] have pointed out that non-propagating cracks were not observed to form at the edge of holes or at the bottom of notches at stress amplitudes just below the fatigue limit except in the case of a very sharp notch [5].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Strength of Ti-6Al-4V Alloys Containing Small Artificial Defects

Matsunaga

Murakami

Kubota

et al. 2003

Journal of the Society of Materials Science, Japan

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The effects of small defects on the fatigue strength of Ti-6 Al-4V were investigated in tension-compression fatigue tests.specimens (Series A). Another series of specimens (Series B) were prepared to investigate the effect of a burr or a pre-crack which was introduced at the edge of the artificial hole. For Series A specimens, the fatigue limit was defined as the threshold for crack initiation from the edge of the hole. For Series B specimens, the fatigue limit was defined as the threshold for crack propagation from the burr or the tip of the pre-crack fatigue limit of Series A specimens, but the model accurately predicted the fatigue limit defined by crack-growth threshold for Series B specimens. In addition it was noted that the presence of abun resulted in a decrease in fatigue life, since the bun facilitated the crack initiation process.

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“…5(b) and 6(b) represent that, in case where there are no facets that can be clearly identified as crack initiation sites, the fatigue properties show almost same tendency with those of the materials in which the surface crack initiation occurs. Therefore, most of the fatigue life of the present materials is supposed to be spent in crack initiating at 293 K Eylon et al [24] investigated the effect of microstructure on crack initiation behaviour in Ti -6% Al -4% V alloy using flat center-notched specimens. They reported that the number of cycles for stable crack propagation could be neglected compared to the number of cycles for crack initiation, especially in the low stress/high cycle regime.…”

Section: Discussionmentioning

confidence: 99%

High-cycle fatigue properties at cryogenic temperatures in forged- and rolled-Ti–5% Al–2.5% Sn ELI alloys

Ono¹,

Yuri

Sumiyoshi

et al. 2003

Science and Technology of Advanced Materials

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High-cycle fatigue properties were investigated at 4, 77 and 293 K in Ti -5% Al -2.5% Sn ELI alloys, in which mean alpha grain sizes were about 30 mm in the rolled material and 80 mm in the forged material. The ultimate tensile strengths of both materials were almost same and increased with decreasing temperature. The fatigue strength of each material also tended to increase with decreasing temperature. At 293 K, the fatigue strength of each material was almost equivalent. At 4 and 77 K, however, the fatigue strength of the rolled material was higher than that of the forged material. Concerning the rolled material, the fatigue strengths at 10 6 cycles at 4 and 77 K were about 1.6 and 1.5 times higher than that at 293 K, respectively. On the other hand, in the forged material, it should be noted that the fatigue strengths in longer-life region (over 10 6 cycles) were almost equivalent not depending on test temperatures. Fatigue cracks initiated in the specimen interior independently of test temperatures and materials (we call this type of crack initiation 'sub-surface crack initiation') and formed facet-like structures at the sub-surface crack initiation sites at 4 and 77 K. The size of each facet-like structure corresponded closely to the grain size itself. The sizes of crack initiation sites were smaller in the rolled material than in the forged material. Since sub-surface cracks, which form facets or crack initiation sites, are supposed to act as defects, it is concluded that grain refinement leads to reduce the size of crack initiation site and this contributes effectively to improve the fatigue strength in high-cycle region at cryogenic temperatures. q

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Effect of microstructure on notch fatigue properties of Ti-6Al-4V

Cited by 107 publications

References 5 publications

High cycle fatigue and fatigue crack propagation behaviors of β-annealed Ti-6Al-4V alloy

High cycle fatigue and fatigue crack propagation behaviors of β-annealed Ti-6Al-4V alloy

Fatigue Strength of Ti-6Al-4V Alloys Containing Small Artificial Defects

High-cycle fatigue properties at cryogenic temperatures in forged- and rolled-Ti–5% Al–2.5% Sn ELI alloys

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