Creep mechanisms in Ti–3Al–2.5V alloy tubing deformed under closed-end internal gas pressurization

Gollapudi, Srikant; Charit, Indrajit; Murty, K. Linga

doi:10.1016/j.actamat.2008.01.052

Cited by 37 publications

(15 citation statements)

References 54 publications

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“…Creep microstructures were not investigated to support the creep mechanism. Creep behaviors with different stress regions were also observed in alpha + beta titanium alloy Ti-3Al-2.5V [10], where the mechanism of creep could be well explained by the microstructural evolution during creep deformation.…”

Section: Introductionmentioning

confidence: 69%

Creep behaviors and stress regions of hybrid reinforced high temperature titanium matrix composite

Xiao

Lü

Qin

et al. 2009

Composites Science and Technology

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Section: Introductionmentioning

confidence: 69%

Creep behaviors and stress regions of hybrid reinforced high temperature titanium matrix composite

Xiao

Lü

Qin

et al. 2009

Composites Science and Technology

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“…[26] Once the steady-state creep rates were achieved, the creep tests were stopped by cooling the specimen down to room temperature using forced air-flow under loaded condition in order to preserve the deformation microstructures.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Coble, Orowan Strengthening, and Dislocation Climb Mechanisms in a Nb-Modified Zircaloy Cladding

Kombaiah

Murty

2015

Metall Mater Trans A

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BOOPATHY KOMBAIAH and KORUKONDA LINGA MURTYBiaxial creep tests on HANA-4 tubes, Nb-added Zircaloy-4 were conducted using internal pressurization of closed-end tubes to investigate the rate-controlling mechanisms over a range of hoop stresses, 8:38 Â 10 À5 E À 2:87 Â 10 À3 E, at three different temperatures 673 K, 723 K, and 773 K (400°C, 450°C, and 500°C). The mechanistic creep parameters such as stress exponent (n) and activation energy (Q C ) were then determined from steady-state creep rates. Based on the variance in stress exponent with respect to the applied stress, three regimes have been identified: a stress exponent close to 1 at low stresses that increased to 3 at the intermediate stresses, which became 4.5 at high stresses. An activation energy value of 226 kJ/mol was evaluated for the n = 3 and n = 4.5 regimes, which lies close to the activation energy for self-diffusion (Q L ) in a-Zr alloys. Further, TEM analyses of crept microstructures and comparison of experimental results with standard models were undertaken to find out the rate-controlling mechanisms. Coble creep, climbing of dislocations to bypass b-Nb precipitates, and dynamic recovery by edge dislocation climb are proposed as the rate-controlling mechanisms in the n = 1, n = 3, and n = 4.5 regimes of HANA-4, respectively.

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“…In the case of the tubular component without feeding, a slightly decrease for the strength of the material can be seen, although it has relatively smaller grain. The decreasing of strength is mainly caused by the internal defects, i.e., micro-sized cavitation in the tube after severe deformation [17]. When the feeding ratio increases to 56 %, the tensile strength is even higher than the original tube because of grain refinement effect, which follows the HallPetch relationship.…”

Section: Mechanical Propertiesmentioning

confidence: 75%

“…On the other hand, titanium and its alloys are found extensive applications including aerospace, marine, chemical, and medical industries due to their excellent properties such as good high temperature performance, high specific strength, good creep resistance, biocompatibility, and good corrosion resistance [17]. Especially, there has been paid much applicable attention for complicated shaped components of titanium alloy for aerospace field, e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

Liu

Wang

et al. 2015

Int J Adv Manuf Technol

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In order to investigate the deforming behavior of the tubular components with a large expansion ratio fabricated by tube gas forming technique, the Ti-3Al-2.5 V tubular components with 50 % expansion ratio were studied under the forming conditions of internal pressure and axial feeding at 800°C. Through thickness measurements, EBSD and tensile tests, the effects of axial feeding on deforming behaviors, such as thickness distribution, microstructure, and mechanical properties of Ti-3Al-2.5 V tubular components, were investigated in details. The results showed that the average thinning ratio of the bulging area could be reduced significantly and the thickness distribution of the workpiece was more uniform with increasing of the feeding. Feeding length influenced the microstructure and strength of components. When the axial feeding ratio (actual feeding length/theoretical feeding length) was 56 %, the component had even higher tensile strength than the original tube because of the grain refinement. If the axial feeding was excessive large, the grain size became adversely coarser, which in turn reduced the tensile strength. These investigations illustrated that tube gas forming under high pressure had potential for fabricating complicated shaped titanium alloy tubular components by reasonably designing and controlling the deforming process.

show abstract

Creep mechanisms in Ti–3Al–2.5V alloy tubing deformed under closed-end internal gas pressurization

Cited by 37 publications

References 54 publications

Creep behaviors and stress regions of hybrid reinforced high temperature titanium matrix composite

Creep behaviors and stress regions of hybrid reinforced high temperature titanium matrix composite

Coble, Orowan Strengthening, and Dislocation Climb Mechanisms in a Nb-Modified Zircaloy Cladding

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

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