On the hardenability of Nb-modified metastable beta Ti-5553 alloy

Campo, Kaio Niitsu; Andrade, Denis Renato; Opini, Victor C.; Mello, Mariana G. de; Lopes, Éder Sócrates Najar; Caram, Rubens

doi:10.1016/j.jallcom.2016.01.142

Cited by 20 publications

(15 citation statements)

References 18 publications

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“…Analogous to ferrous alloys, the thicker the section that can retain the metastable β-phase, the higher the hardenability of the beta Ti alloy. The hardenability can be measured by a modified Jominy End Quench test but only a few studies are present in the extant literature [123]. In order for a beta Ti alloy to be hardenable, the hcp α -martensite phase and the orthorhombic α -martensite phase must be suppressed during solution treatment and quenching permitting the alloy to exist predominantly of the bcc β-phase in a supersaturated state.…”

Section: Solution Treatment and Agingmentioning

confidence: 99%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

494

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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Section: Solution Treatment and Agingmentioning

confidence: 99%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

494

175

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“…In our previous work, we investigated the effect of the compression strain on the dynamic recrystallization behavior for the β phase of Ti-5553 alloy during the sub-transus thermomechanical processing. Our findings suggest that in the proper forging temperature range the critical strain for the dynamic recrystallization β phase is 0.30 [ 7 ]. The mechanism for the dynamic recrystallization of the β phase includes the formation of the low- angle grain boundary that is induced by the dislocation accumulation and the transformation from the low-angle grain boundary of the β phase to the high-angle grain boundary of the β phase [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

“…Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy, which is a relatively new near-β titanium alloy, exhibits several unique merits such as improved hardenability and better compositional homogeneity in melting as compared to other titanium alloys [ 6 , 7 ]. Owing to the attainable ultra-high yield strength shown in Table 1 , this new alloy can be sued in thick section forging for high-strength airframe components, e.g., landing gear, flap tracks, etc [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Qin

Liu

2023

Materials

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In order to fabricate homogeneous large-scale Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy bulk with fine and equiaxial β grain, we performed a series of multi-axial α + β field forging with 62 forging cycles on the large-scale Ti-5553 billet by using 12.5 MN high-speed hydraulic press. The β-annealed microstructure was the starting microstructure of the billet. After the 6th forging cycle, β grain deformed dramatically, and the grain-boundary network developed within the irregular β grain. As the forging cycle increased to 44, the volume fraction of the fine and equiaxial β grain that is less than 20 μm, which is caused by dynamic recrystallization, increased gradually. However, the incomplete dynamic recrystallization region within the original β grain could not be eliminated. As the forging cycle further increased, the volume fraction of the fine and equiaxial β grain did not increase. In contrast, the abnormal grain growth of the β phase occurred during 50th~62nd forging cycle. Here, we attribute the formation of the incomplete dynamic recrystallization region and the abnormal grain growth of the β phase to the high deformation rate of the α + β forging. The refining behavior of β grain and the abnormal coursing β grain, which is found during the multi-cycle multi-axial forging of large-scale Ti-5553 alloy billet, are seldom reported in the isothermal compression of small-scale Ti-5553 alloy specimen. The findings of the paper are instructive for improving the sub-transus forging strategy that is used to fabricate the large-scale homogeneity Ti-5553 alloy billet with fine and equiaxial β grain.

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“…Alloy modifications with Nb in Ti-5553 were already investigated in the forged and heat-treated conditions to improve mechanical properties [6] or increase hardenability [7]. Opini et al [6] investigated the microstructures and mechanical properties of heat-treated Ti-5553 and Ti-12Nb-5Al-5Mo-3Cr-0.5Fe.…”

Section: Introductionmentioning

confidence: 99%

“…The authors observed that an increase in strength took place due to nonhomogeneous α phase precipitation with Nb additions. Campo et al [7] studied the hardenability of Nb-modified Ti-5553 and reported a reduction in the β-transus temperature with the replacement of V with Nb. The Nb addition changed the decomposition kinetics of the β phase, thus an improvement in hardenability could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Powder metallurgy processing of Nb-modified near β titanium alloys prepared with elemental powders

et al. 2023

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Near β Ti alloys typically show high specific strength and provide a wide spectrum of mechanical properties with different heat treatments. In this work, a commercial near β Ti alloy Ti-5553 (Ti-5Al-5V-5Mo-3Cr-0.5Fe) was prepared through powder metallurgy using the blended elemental powder approach. Additionally, alloy modifications with 6 wt.% Nb (Ti-6Nb-5Al-2.5V-5Mo-3Cr-0.5Fe) and 12 wt.% Nb (Ti-12Nb-5Al-5Mo-3Cr-0.5Fe) were investigated. Specimens were prepared by uniaxial cold compaction of blended powders at room temperature with sintering conducted at 1300°C for 2 h under Ar atmosphere. Microstructure investigation revealed reasonable homogenisation of alloying elements and colony sizes in the order of 80-100 μm with porosity below 10%. Moreover, the bending strength of as-sintered Ti-12Nb-5Al-5Mo-3Cr-0.5Fe was about 850 MPa and the micro-Vickers hardness was approximately 370 HV. The alloy modifications with Nb increased strength without loss in flexural strain.

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On the hardenability of Nb-modified metastable beta Ti-5553 alloy

Cited by 20 publications

References 18 publications

A Review of Metastable Beta Titanium Alloys

A Review of Metastable Beta Titanium Alloys

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Powder metallurgy processing of Nb-modified near β titanium alloys prepared with elemental powders

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