Recent Advances in the Deformation Processing of Titanium Alloys

Tamirisakandala, Seshacharyulu; Bhat, R.B.; Vedam, B. V.

doi:10.1361/105994903322692466

Cited by 78 publications

(38 citation statements)

References 15 publications

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“…Previous work has demonstrated that thermomechanical processing of Ti-6Al-4V near or above the beta transus can produce dynamic recovery or recrystallization, depending on the strain rate and strain conditions. [20,21] Specifically, the application of a strain rate of 1 s Ϫ1 to a deformation strain of 0.7 was observed to give approximately 30 pct dynamic recrystallization at 1050°C. [22,23] To determine the role of restoration processes such as recovery and recrystallization, during linear friction welding of Ti-6Al-4V under the various processing conditions applied, the following relation developed by Vairis and Frost [1,2] was used for calculating the maximum strain rate: [2] For the present linear friction-welding conditions of frequency between 15 and 70 Hz and oscillation amplitude between 1 and 3 mm, the local-strain-rate values at the interface of the Ti-6Al-4V alloy were determined to range between 0.9 and 4.3 s Ϫ1 .…”

Section: Weld Center Characteristicsmentioning

confidence: 99%

Linear friction welding of Ti-6Al-4V: Processing, microstructure, and mechanical-property inter-relationships

Wanjara

Jahazi

2005

Metall Mater Trans A

220

195

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The linear friction welding behavior of Ti-6Al-4V was investigated using varying processing conditions of frequency (15 to 70 Hz), amplitude (1 to 3 mm), pressure (50 to 90 MPa), and axial shortening (1 to 2 mm). Examination of linear friction welded Ti-6Al-4V using microscopic techniques indicated that the process requires certain critical conditions at the interface and its adjacent region to be reached for producing joints without structural defects along the weld centerline, such as voids or oxide inclusions. Characterization of the weldments included analysis of the microstructural features of the weld and thermomechanically affected zones (TMAZs) in relation to the parent material. It was observed that in the weld region, exposure to supertransus temperatures (Ͼ995°C) combined with hot-deformation working and rapid cooling after joining produced recrystallization of the beta grain structure that had a Widmanstätten alpha-beta transformation microstructure. In the TMAZ, the bimodal microstructure of the parent material was deformed and the presence of elongated alpha grains with broken beta-phase particles was established. Through examination of the mechanical properties, using microhardness and tensile testing, the integrity of the joints was determined in order to assess the impact of the various processing parameters and to define the optimum welding conditions.

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Section: Weld Center Characteristicsmentioning

confidence: 99%

Linear friction welding of Ti-6Al-4V: Processing, microstructure, and mechanical-property inter-relationships

Wanjara

Jahazi

2005

Metall Mater Trans A

220

195

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“…6) During hot compression, changes in the phase fraction or morphology very frequently occur in titanium alloys, and these changes are assumed to be induced by the temperature. 7,8) In the present study, we investigated the dynamic phase transformation during subtransus forging in a PM Ti1.5Fe2.25Mo alloy, and provided evidence that the compressive deformation can also significantly alter the ¡¼¢ phase transformation. The underlying mechanisms of how the deformation affects the phase transformation were also discussed.…”

Section: Introductionmentioning

confidence: 97%

Dynamic Phase Transformation during Hot-Forging Process of a Powder Metallurgy α+β Titanium Alloy

Liu

Matsumoto

et al. 2012

Mater. Trans.

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“…1) Chen et al 2) reported that commercially pure (CP) titanium has low ductility at room temperature (RT), and requires thermal activation to increase its ductility and formability for lack of operative slip systems, which is characteristic of hexagonal close-packed (HCP) crystals. Similar results were also reported on the tensile deformation of CP Ti at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Characterizations of Temperature-Dependent Tensile Deformation and Fracture Features of Commercially Pure Titanium

et al. 2013

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Tensile deformation and fracture behavior of a commercially pure (CP) titanium were investigated at different temperatures through mechanical tests, microstructural observations and fractal analyses. It was found that, with increasing temperature, the number and size of microvoids formed along shear bands (SBs) or at the intersections of SBs on the deformed specimen surface increase, and the fractal dimensions of the scanning profile at the surface near fracture increase correspondingly, and the ones measured perpendicular to the tensile direction is obviously larger than those parallel to the tensile direction, indicating an increased concentration of plastic deformation of CP Ti along the tensile axis. The diameter and depth of dimples on the fracture surfaces of CP Ti increase significantly with increasing temperature, giving rise to a higher fracture surface roughness reflected by a higher fractal dimension. TEM observations demonstrated that the plastic deformation of CP Ti is gradually occupied by dislocation slipping rather than twinning with increasing temperature. This is in good agreement with the fractal analyses of the deformation and fracture features.

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Recent Advances in the Deformation Processing of Titanium Alloys

Cited by 78 publications

References 15 publications

Linear friction welding of Ti-6Al-4V: Processing, microstructure, and mechanical-property inter-relationships

Linear friction welding of Ti-6Al-4V: Processing, microstructure, and mechanical-property inter-relationships

Dynamic Phase Transformation during Hot-Forging Process of a Powder Metallurgy α+β Titanium Alloy

Characterizations of Temperature-Dependent Tensile Deformation and Fracture Features of Commercially Pure Titanium

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Recent Advances in the Deformation Processing of Titanium Alloys

Cited by 78 publications

References 15 publications

Linear friction welding of Ti-6Al-4V: Processing, microstructure, and mechanical-property inter-relationships

Linear friction welding of Ti-6Al-4V: Processing, microstructure, and mechanical-property inter-relationships

Dynamic Phase Transformation during Hot-Forging Process of a Powder Metallurgy &alpha;+&beta; Titanium Alloy

Characterizations of Temperature-Dependent Tensile Deformation and Fracture Features of Commercially Pure Titanium

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Dynamic Phase Transformation during Hot-Forging Process of a Powder Metallurgy α+β Titanium Alloy