Elastic moduli and tensile and physical properties of heat-treated and quenched powder metallurgical Ti-6Al-4V alloy

Lee, Y. T.; Peters, M.; Welsch, G.

doi:10.1007/bf02670293

Cited by 59 publications

(15 citation statements)

References 9 publications

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“…6(a)). This is consistent with an earlier report in which a high solution heat treatment temperature (>1173 K) led to a lower vanadium enrichment in the β phase and thus to a transformation into αʹ instead of α" upon quenching [35]. However, the microstructure of the lamellar alloy in Fig.…”

Section: Mechanical Properties After Pdasupporting

confidence: 92%

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Shahmir

Langdon

2017

Acta Materialia

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Experiments were conducted to investigate the processing parameters that may be used to optimize the properties of Ti-6Al-4V alloys. The alloy was initially subjected to two different heat treatments leading to the formation of martensitic αʹ and lamellar α+β microstructures and then both materials were processed by high-pressure torsion (HPT) for 10 turns at room temperature. This gave significant grain refinement to the nanometer range in both conditions and the occurrence of an allotropic hcp to fcc phase transformation in the martensitic alloy.These nanostructured alloys were subjected to post-deformation annealing (PDA) at temperatures in the range of 473 to 1023 K. The results show the hardness increases slightly to 773 K due to αʹ+fcc→α+β+fcc and α→α+β phase transformations in the martensitic αʹ and lamellar α+β alloys and then decreases up to 1023 K due to recrystallization and grain growth.An optimum property of a very high yield strength (~1120 MPa) and ultimate tensile strength (~1200 MPa), together with excellent ductility (elongation to failure of ~26%), was achieved in the Ti-6Al-4V martensitic alloy processed by a combination of HPT followed by PDA at 873 K for 60 min.

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Section: Mechanical Properties After Pdasupporting

confidence: 92%

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Shahmir

Langdon

2017

Acta Materialia

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“…For example, in the central colony the α laths were interspersed by very fine retained β layers, ∼300 nm wide, whilst in the surrounding basket-weave regions, the retained β was almost an order of magnitude thicker. [20] 75 -135 106 -113.5 40 -45 Ref. [21] 113 110 Ref.…”

Section: Materials Conditionmentioning

confidence: 99%

On the effect of hydrogen on the elastic moduli and acoustic loss behaviour of Ti-6Al-4V

Driver

Jones

Stone

et al. 2016

Philosophical Magazine

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The elastic moduli and acoustic loss behaviour of Ti-6Al-4V (wt.%) in the temperature range 5-298 K have been studied using Resonant Ultrasound Spectroscopy. A peak in the acoustic dissipation was observed at 160 K within the frequency range 250-1000 kHz. Analysis of the data acquired in this study, coupled with complementary data from the literature, showed that this was consistent with a Snoeklike relaxation process with an associated activation energy of 23 ± 3 kJ mol −1 . However, the loss peak was broader than would be expected for a Snoek-like relaxation, and the underlying process was shown to have a spread of relaxation times. It is suggested that this effect arises as a result of variations in the strain experienced by the β phase due to different local microstructural constraint by the bounding secondary α phase. ARTICLE HISTORY

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“…For cooling rates in excess of 410 • C/s β may undergo a martensitic transformation or be retained at room temperature, depending on the volume fraction of this phase in the alloy. Several authors have observed that β is completely retained upon quenching if its proportion in the alloy is lower than 0.25, because the β phase is enriched in vanadium, a β stabiliser (Fan, 1993;Lee et al, 1991;R. Castro, 1966).…”

Section: Phase Transformations During Second Coolingmentioning

confidence: 99%

“…The Young's modulus and hardness were calculated from the phase constitution of the alloy using the rule of mixtures (Costa et al, 2005;Fan, 1993;Lee et al, 1991 …”

Section: Calculation Of Mechanical Propertiesmentioning

confidence: 99%

Modelling of Heat Transfer and Phase Transformations in the Rapid Manufacturing of Titanium Components

Crespo¹

2011

Convection and Conduction Heat Transfer

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Elastic moduli and tensile and physical properties of heat-treated and quenched powder metallurgical Ti-6Al-4V alloy

Cited by 59 publications

References 9 publications

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

On the effect of hydrogen on the elastic moduli and acoustic loss behaviour of Ti-6Al-4V

Modelling of Heat Transfer and Phase Transformations in the Rapid Manufacturing of Titanium Components

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