Study of Alpha-Beta Transformation in Ti-6Al-4V-ELI. Mechanical and Microstructural Characteristics

Tarín, P.; Gualo, Aurelio; Simon, A.; Piris, N. M.; Badía, J. M.

doi:10.4028/www.scientific.net/msf.638-642.712

Cited by 10 publications

(9 citation statements)

References 7 publications

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“…The α-phase (hexagonal close-packed (HCP), SG: P63/mmc) is the major, which will get transformed progressively to β-phase (minor, bodycentered cubic (BCC)) with increment in temperature on ST. The transition gets completed once the β-transus temperature (≈980 °C ) has been attained [52]. The β-treated structure, generally in the form of acicular or lamellar orientations is achieved through processing/ heat treatment of the alloy above the transformation temperature.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Tribology of Ti6Al4V: A review

2019

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The deleterious innate attribute of Ti6Al4V, the workhorse material among the alloy series of titanium is its incompetent tribo-behavior. Infinite surface modification techniques, viz., the accretion of adherent appendage layers, diffusion hardening, infusion of residual stresses, microstructural evolution, and phase transformations were attempted to enhance the wear resistance of the alloy. The need lies to establish a bridge between the indigenous material properties and the tribo-characteristics of Ti6Al4V so that the enforced improvement techniques can raise the barriers of its applicability. A critical review of the microstructural transitions, mechanisms governing tribo-behavior and the parametric conditions leading to material removal at dry sliding conditions of Ti6Al4V, falls under the scope of this manuscript. Hence, the prime focus of the approach is to impart a clear-cut perception of the minute variations in mechanical, metallurgical, and tribological characteristics of the alloy at interactive instances with distinct counter-body surfaces.

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Section: Microstructural Evolutionmentioning

confidence: 99%

Tribology of Ti6Al4V: A review

2019

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“…Titanium undergoes an α → β phase transformation above 890 • C, and this allotropic phase transformation affects the microstructure and texture of the material. The Ti64 alloy undergoes an β ↔ α + β phase transformation at about 1000 • C [30]. However, the L-PBF process leads to metastable martensitic microstructure due to the high cooling rates up to 10 5 K/s [31].…”

Section: Resultsmentioning

confidence: 99%

“…and texture of the material. The Ti64 alloy undergoes an β  α + β phase transformation at about 1000 °C [30]. However, the L-PBF process leads to metastable martensitic microstructure due to the high cooling rates up to 10 5 K/s [31].…”

Section: Resultsmentioning

confidence: 99%

Structure and Properties of Ti/Ti64 Graded Material Manufactured by Laser Powder Bed Fusion

et al. 2021

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Multimaterial additive manufacturing is an attractive way of producing parts with improved functional properties by combining materials with different properties within a single part. Pure Ti provides a high ductility and an improved corrosion resistance, while the Ti64 alloy has a higher strength. The combination of these alloys within a single part using additive manufacturing can be used to produce advanced multimaterial components. This work explores the multimaterial Laser Powder Bed Fusion (L-PBF) of Ti/Ti64 graded material. The microstructure and mechanical properties of Ti/Ti64-graded samples fabricated by L-PBF with different geometries of the graded zones, as well as different effects of heat treatment and hot isostatic pressing on the microstructure of the bimetallic Ti/Ti64 samples, were investigated. The transition zone microstructure has a distinct character and does not undergo significant changes during heat treatment and hot isostatic pressing. The tensile tests of Ti/Ti64 samples showed that when the Ti64 zones were located along the sample, the ratio of cross-sections has a greater influence on the mechanical properties than their shape and location. The presented results of the investigation of the graded Ti/Ti64 samples allow tailoring properties for the possible applications of multimaterial parts.

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“…Ti-407 material was supplied in the form of a seamless rolled ring processed with a combination of temperatures above and below the β transus (T βt ), that is, in the β-phase field and in the (α + β) temperature region, respectively. T βt was determined by nonisothermal dilatometry, as this technique is an effective method for studying the phase transformation process [25,26] since the expansion curve and its first derivative can indicate the onset, development, and completion of the phase transformation [27]. The thermal dilatometry test was performed using a Linseis model L75 vertical dilatometer at a constant heating rate of 5 • C/min from room temperature to 900 • C. The thermal expansion of a cylindrical sample measuring 10 mm in diameter and 30 mm in length was plotted as a function of temperature, and its first derivative with respect to time was obtained to indicate the rate of expansion.…”

Section: Methodsmentioning

confidence: 99%

Effect of Initial Microstructure on the Temperature Dependence of the Flow Stress and Deformation Microstructure under Uniaxial Compression of Ti-407

Barboza,

López,

Guajardo

et al. 2024

Metals

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In this study, the influence of initial microstructure and deformation temperature on the flow stress behavior and microstructural evolution of TIMETAL®407 (Ti-407) alloy are investigated. For this purpose, compression cylinders were β-annealed at 940 °C and then cooled to room temperature using furnace cooling, static air, and water quenching to promote three initial microstructures with different α lath thicknesses. The annealed cylinders were compressed isothermally in the range of 750 °C to 910 °C at a constant crosshead speed of 0.05 mm/s up to an engineering strain of −0.8. The resulting stress–strain curves are discussed in terms of the morphology and distribution of the α and β phases. It was found that flow stress is inversely proportional to deformation temperature for all initial microstructures. At the lowest temperatures, compressive yield strength was higher in water-quenched and air-cooled samples than in furnace-cooled specimens, suggesting that the acicular α-phase morphology obtained by rapid cooling could enhance mechanical strength by hindering dislocation motion. Two high-temperature flow regimes were determined based on the shape of the flow stress curves, indicating microstructural changes occurring during deformation. At higher temperatures, the effect of the initial microstructure is negligible as the primary α phase is transformed to the β phase at around 850 °C irrespective of the initial α-lath thickness.

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Study of Alpha-Beta Transformation in Ti-6Al-4V-ELI. Mechanical and Microstructural Characteristics

Cited by 10 publications

References 7 publications

Tribology of Ti6Al4V: A review

Tribology of Ti6Al4V: A review

Structure and Properties of Ti/Ti64 Graded Material Manufactured by Laser Powder Bed Fusion

Effect of Initial Microstructure on the Temperature Dependence of the Flow Stress and Deformation Microstructure under Uniaxial Compression of Ti-407

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