A study of cyclic fatigue, damage initiation, damage propagation, and fracture of welded titanium alloy plate

Srivatsan, T. S.; Bathini, Udaykar; Patnaik, Anil; Quick, T.

doi:10.1016/j.msea.2010.06.086

Cited by 14 publications

(7 citation statements)

References 22 publications

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“…7 c ), populations of microscopic voids are observed which will eventually coalescent and result in the formation of one or more fine microcracks under continued cyclic loading. 24…”

Section: Resultsmentioning

confidence: 99%

“…7c), populations of microscopic voids are observed which will eventually coalescent and result in the formation of one or more fine microcracks under continued cyclic loading. 24 5 Distribution of Feret ratio of a phase for BT25 alloy with different height reductions Among all these regions on the fracture surface of a specimen failed by high cycle fatigue, crack initiation region plays the most important role in fracture behaviours since fatigue failure in the high cycle fatigue is often dominated by the crack initiation processes. In other words, the more time the crack nucleation consumes, the longer fatigue life the alloy will possess.…”

Section: Fractographic Analysismentioning

confidence: 99%

“…When the strain accumulation at the localised sites exceeds a critical value, microcrack initiation is favoured to occur. 24 Conclusions HCF properties of BT25 titanium alloy with height reductions of 50 and 80% were examined by fractographic and quantitative microstructural analysis. Microstructures and fracture surfaces of the two conditions are compared.…”

Section: Fractographic Analysismentioning

confidence: 99%

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Study of fatigue properties of forged BT25 titanium alloy based on fractographic and quantitative microstructural analysis

Wang

Zeng

et al. 2015

Materials Science and Technology

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The high cycle fatigue (HCF) properties of forged BT25 titanium alloy was examined by fractographic and quantitative microstructural analysis. Two different height reductions (50 and 80%) were applied to the isothermal compression of BT25 alloy with initial lamellar microstructure. Fatigue limits obtained through up and down method were 440 and 450 MPa respectively. Microstructural analysis showed that the globularisation volume fraction of the two microstructures (MA represents the microstructure of the alloy with the height reduction of 50%, while MB is used for 80%) were 62?72 and 84?13% respectively. There was more lamellar a in which Feret ratio was greater than 3?5 remained in MA, 16?96%. Hence, a larger globularisation volume fraction is more beneficial for resistance to fatigue failure. The fracture surfaces of the failed testing specimens were examined and the fatigue crack initiation mechanisms were discussed. Cracks initiated in grains by means of constituting extrusions through combined glide and dislocation annihilation in slip bands, while those initiating along the a/b phase interface arose from discordant deformation of a and b phases with different Young's modulus.

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“…7 c ), populations of microscopic voids are observed which will eventually coalescent and result in the formation of one or more fine microcracks under continued cyclic loading. 24…”

Section: Resultsmentioning

confidence: 99%

Section: Fractographic Analysismentioning

confidence: 99%

Section: Fractographic Analysismentioning

confidence: 99%

See 1 more Smart Citation

Study of fatigue properties of forged BT25 titanium alloy based on fractographic and quantitative microstructural analysis

Wang

Zeng

et al. 2015

Materials Science and Technology

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“…The influence of microstructure on the fatigue of welded titanium Grade 5 specimens were examined with load controlled fatigue tests and damage initiation, damage propagation and fracture behaviour were observed in [ 6 ]. In [ 7 ], service lives of gas tungsten arc, electron beam and laser beam welded titanium Grade 5 were investigated by evaluating the fatigue crack growth parameters of samples.…”

Section: Introductionmentioning

confidence: 99%

Load Controlled Fatigue Behaviour of Microplasma Arc Welded Thin Titanium Grade 5 (6Al-4V) Sheets

2020

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The current study investigates the load controlled fatigue properties of the microplasma arc welded thin titanium Grade 5 (6Al-4V) sheets. In order to explore the effect of weld geometry on the fatigue, two different welded joints were used in the experimental studies. Load controlled fatigue test results were evaluated to present an outlook on the behaviour of microplasma welded titanium alloy Grade 5 sheets under cyclic loading. Even though the previously published monotonic tests showed successful use of microplasma arc welding to join thin titanium Grade 5 sheets with mechanical properties comparable to the base metal, fatigue life of the welded joints was lower than the lives of samples without welds. In particular, the fatigue performance of overlap joints was very poor. This was presumed to be due to the changed material properties of the heat affected zone which was formed by the excess heat of the welding process as fractures often occurred at such locations. Based on experimental findings and fractographic observations, a clear adverse effect of welding process in material behaviour was discovered. Despite the concentrated heat of microplasma arc welding, post-weld heat treatment of the weld area is recommended to improve the mechanical behaviour of the welded joints.

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“…10 Earlier studies have revealed a number of important factors underlying the fatigue behaviour of titanium alloys. It is reported in the literature [12][13][14][15][16][17][18][19][20] that the volume fraction and the morphology of the phases (α, β) in titanium alloys appear to be critical parameters for their mechanical properties in general and for their fatigue properties in particular. Indeed, the service life and reliability of these alloys depend on the microstructure obtained after hot working and final heat treatment and on the condition of the surface layer.…”

Section: Introductionmentioning

confidence: 99%

Static and fatigue characterization of the Ti5553 titanium alloy

Bettaieb

Lenain

Habraken

2012

Fatigue Fract Eng Mat Struct

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This paper presents and discusses static (elastoviscoplastic and damage) and high‐cycle fatigue characterization of two microstructures of the Ti5553 alloy. The difference between these two microstructures is related to their heat treatment and precisely to the temperature of the final aging. For each microstructure, several tests were carried out to identify their static and fatigue properties and the test results were correlated to the microstructure. A fractographic analysis of the rupture sections was performed in order to investigate the fracture mechanisms of the two microstructures. Finally, the fatigue properties of the two microstructures were compared with those found in results reported in the literature for two other classical titanium alloys used for aeronautical applications.

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A study of cyclic fatigue, damage initiation, damage propagation, and fracture of welded titanium alloy plate

Cited by 14 publications

References 22 publications

Study of fatigue properties of forged BT25 titanium alloy based on fractographic and quantitative microstructural analysis

Study of fatigue properties of forged BT25 titanium alloy based on fractographic and quantitative microstructural analysis

Load Controlled Fatigue Behaviour of Microplasma Arc Welded Thin Titanium Grade 5 (6Al-4V) Sheets

Static and fatigue characterization of the Ti5553 titanium alloy

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