Effect of duplex aging on microstructure and mechanical behavior of beta titanium alloy Ti–15V–3Cr–3Al–3Sn under unidirectional and cyclic loading conditions

Santhosh, R.; Manivasagam, Geetha; Saxena, Vikas; Rao, M. Nageswara

doi:10.1016/j.ijfatigue.2014.12.005

Cited by 44 publications

(17 citation statements)

References 20 publications

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“…Duplex ageing treatment yielded a superior combination of mechanical properties with no precipitation free zone and finer alpha precipitation compared to single ageing in Ti-15V-3Al-3Cr-3Sn-3Zr [16] and Ti-3Al-8V-6Cr-4Mo-4Zr [17]. The rate of heating to ageing temperature was found to have a substantial effect on the evolution of microstructure and mechanical properties [18].…”

Section: Heat Treatmentmentioning

confidence: 96%

Processing of Beta Titanium Alloys for Aerospace and Biomedical Applications

Soundararajan¹,

Vishnu²,

Manivasagam³

et al. 2018

Titanium Alloys - Novel Aspects of Their Processing [Working Title]

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The unique combination of attributes-high strength to weight ratio, excellent heat treatability, a high degree of hardenability, and a remarkable hot and cold workability-has made beta titanium alloys an attractive group of materials for several aerospace applications. Titanium alloys, in general, possess a high degree of resistance to biofluid environments; beta titanium alloys with high molybdenum equivalent have low elastic modulus coming close to that of human bone, making them particularly attractive for biomedical applications. Bulk processing of the alloys for aerospace applications is carried out by double vacuum melting followed by hot working. There have been many studies with reference to super-solvus and sub-solvus forging of beta titanium alloys. For alloys with low to medium level of molybdenum equivalent, sub-solvus forging was demonstrated to result in a superior combination of mechanical properties. A number of studies have been carried out in the area of heat treatment of beta titanium alloys. Studies have also been devoted to surface modification of beta titanium alloys. The chapter attempts to review these studies, with emphasis on aerospace and biomedical applications.

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Section: Heat Treatmentmentioning

confidence: 96%

Processing of Beta Titanium Alloys for Aerospace and Biomedical Applications

Soundararajan¹,

Vishnu²,

Manivasagam³

et al. 2018

Titanium Alloys - Novel Aspects of Their Processing [Working Title]

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“…%) alloy by Santhosh et al, led to higher strengths and hardness compared to isothermal aging, which was caused by a finer dispersion and higher number density of α-phase precipitates [145]. The authors also demonstrated that duplex aging of this alloy led to a four or five times increase of the high cycle fatigue strength [146]. Coakley et al, reported a qualitatively similar increase in hardness after duplex aging in the commercially important Ti-5Al-5Mo-5V-3Cr (wt.…”

Section: Stress-induced Transformationsmentioning

confidence: 96%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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Abstract:In this article, we provide a broad and extensive review of beta titanium alloys. Beta titanium alloys are an important class of alloys that have found use in demanding applications such as aircraft structures and engines, and orthopedic and orthodontic implants. Their high strength, good corrosion resistance, excellent biocompatibility, and ease of fabrication provide significant advantages compared to other high performance alloys. The body-centered cubic (bcc) β-phase is metastable at temperatures below the beta transus temperature, providing these alloys with a wide range of microstructures and mechanical properties through processing and heat treatment. One attribute important for biomedical applications is the ability to adjust the modulus of elasticity through alloying and altering phase volume fractions. Furthermore, since these alloys are metastable, they experience stress-induced transformations in response to deformation. The attributes of these alloys make them the subject of many recent studies. In addition, researchers are pursuing development of new metastable and near-beta Ti alloys for advanced applications. In this article, we review several important topics of these alloys including phase stability, development history, thermo-mechanical processing and heat treatment, and stress-induced transformations. In addition, we address recent developments in new alloys, phase stability, superelasticity, and additive manufacturing.

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“…One of the strategies to improve the endurance limit is by properly designing a duplex aging heat treatment step compared to single aging, in order to facilitate more uniform α precipitation. Duplex aging of Ti-15V-3Al-3Cr-3Sn alloy at 250°C/24 h + 500°C/8 h resulted in a microstructure almost free of GB α , and this was also reported as one of the important reasons for the notable increase in fatigue life in high cycle regime after duplex aging [34]. Presence of GB α supports the intergranular fracture and reduces the ductility of the material [25,28,49,50].…”

Section: Grain Boundary αmentioning

confidence: 96%

“…Precipitates were found to be finer and microstructure was also free of precipitate-free zones (PFZs) and grain boundary α (GB α ); this led to a significant improvement in fatigue life of Ti 38-644 [33]. In Ti-15-3 alloy, finer and more homogenous distribution of α precipitates was achieved through duplex aging compared to the single-step aging [34,36]. In addition to an increase in the mechanical strength (i.e., YS and UTS), increase in ductility was also achieved by duplex aging of Ti-15-3 alloy [17].…”

Section: Duplex Agingmentioning

confidence: 99%

“…Dual-step aging or duplex aging unlocks the room for further betterment in the mechanical properties through finer and homogeneous α precipitation compared to single-step aging. Many researchers have reported the advantage of duplex aging over single-step aging of beta Ti alloys; most studied is the low-high combination, that is, a low temperature for first step aging and a somewhat higher temperature for second step aging [31][32][33][34][35]. Enhancement of the material behavior during unidirectional and cyclic/fatigue loading could be achieved through duplex aging.…”

Section: Duplex Agingmentioning

confidence: 99%

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Heat Treatment of Metastable Beta Titanium Alloys

Soundararajan¹,

Vishnu²,

Manivasagam³

et al. 2021

Welding - Modern Topics

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Heat treatment of metastable beta titanium alloys involves essentially two steps-solution treatment in beta or alpha+beta phase field and aging at appropriate lower temperatures. High strength in beta titanium alloys can be developed via solution treatment followed by aging by precipitating fine alpha (α) particles in a beta (β) matrix. Volume fraction and morphology of α determine the strength whereas ductility is dependent on the β grain size. Solution treatment in (α + β) range can give rise to a better combination of mechanical properties, compared to solution treatment in the β range. However, aging at some temperatures may lead to a low/nil-ductility situation and this has to be taken into account while designing the aging step. Heating rate to aging temperature also has a significant effect on the microstructure and mechanical properties obtained after aging. In addition to α, formation of intermediate phases such as omega, beta prime during decomposition of beta phase has been a subject of detailed studies. In addition to covering these issues, the review pays special attention to heat treatment of beta titanium alloys for biomedical applications, in view of the growing interest this class of alloys have been receiving.

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Effect of duplex aging on microstructure and mechanical behavior of beta titanium alloy Ti–15V–3Cr–3Al–3Sn under unidirectional and cyclic loading conditions

Cited by 44 publications

References 20 publications

Processing of Beta Titanium Alloys for Aerospace and Biomedical Applications

Processing of Beta Titanium Alloys for Aerospace and Biomedical Applications

A Review of Metastable Beta Titanium Alloys

Heat Treatment of Metastable Beta Titanium Alloys

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