Microstructure evolution, mechanical response and strengthening models for TA15 titanium alloy during thermal processes: A brief review

Ji, Ruyi; Zhu, Kai; Zhang, Haicheng; Luo, Hengjun; Mao, Jian

doi:10.1016/j.jmrt.2023.12.099

Cited by 6 publications

(2 citation statements)

References 132 publications

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“…As can be seen in Figures 6c and 8c, after deformation at 830 • C, material furnace-cooled or water-quenched after the β-annealing treatment exhibits the presence of equiaxed α grains within a transformed β matrix, which indicates that this temperature is just below the T βt . A similar behavior has been reported for titanium alloy TA15, in which the deformation above a critical globularization strain [39] at temperatures close to T βt influenced the volume fraction and aspect ratio of the α phase [40]. On the other hand, the sample that was air-cooled after the β annealing (Figure 7c) exhibits a microstructure consisting of a combination of elongated and equiaxed α grains in a transformed β matrix.…”

Section: Resultssupporting

confidence: 80%

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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Section: Resultssupporting

confidence: 80%

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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show abstract

“…With the development of aerospace technology, titanium alloy [1,2], known as a modern metal and space metal, has gained increasing attention and favor in aerospace manufacturing due to its low density, high specific strength, strong damping performance, high impact toughness, and strong fatigue resistance [1]. As a form of near-α titanium alloy [3,4], TA15 titanium alloy combines the α phase, which has the weldability and thermal strength of titanium alloys, and the β phase, which possesses the plasticity of dual-phase titanium alloys and has been widely used in aircraft frame structural components [5][6][7]. In the manufacturing process of titanium alloy components for aviation, welding technology has become indispensable because welding structures are simple, material-saving, and have high reliability, which can achieve high-quality, efficient, and low-cost manufacturing [8,9].…”

Section: Introductionmentioning

confidence: 99%

Tailoring Weldability for Microstructures in Laser-Welded Near-α Titanium Alloy: Insights on Mechanical Properties

Zhang,

Cong,

Zeng

et al. 2024

Metals

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With the development of lightweight aerospace structures, the use of the high-quality and efficient laser welding of near-α titanium alloys has received widespread attention and favor thanks to its superior comprehensive performance. The welding experiment of 3 mm thick TA15 titanium alloy was carried out by YAG laser welding, and the material weldability, microstructure, microhardness, and mechanical properties of welded joints were systematically studied. The results indicated that laser welding of TA15 titanium alloy can produce well-formed welded joints without defects such as cracks and porosity. The welded metal used was a typical basket-weave microstructure composed of a large number of α′ martensitic phases and a small number of high-temperature residual β phases, and the heat-affected zone was a staggered arrangement of undissolved α phase and needle-like α′ martensite. The microhardness of the welded joint showed a hump distribution, and the hardness of WM fluctuated between 410 and 450 HV since the martensitic transformation occurred during the solidification of the weld under thermal cycling, and the β phase changed to the needle-like α′ phase. The tensile test indicated that the fracture position was located in the base metal area, and the fracture morphology showed the equiaxial dimple morphology of different sizes in a ductile fracture mode. The welded metal had the lowest impact performance (average value of 5.3 J) because the weld area was predominantly coarse α′ martensite. This experiment conducted systematic, in-depth, and extensive research on welding processes, hardness, tensile, impact, and fracture mechanisms. Based on the special product applications in the aerospace field, it was more targeted and conducive to promoting the application of the welding process in this material.

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Static properties evaluation for laser deposition repaired TA15 components based on a constitutive model considering annealing heat treatment

Zhou,

Qian,

Bai

2024

Engineering Failure Analysis

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Microstructure evolution, mechanical response and strengthening models for TA15 titanium alloy during thermal processes: A brief review

Cited by 6 publications

References 132 publications

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

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

Tailoring Weldability for Microstructures in Laser-Welded Near-α Titanium Alloy: Insights on Mechanical Properties

Static properties evaluation for laser deposition repaired TA15 components based on a constitutive model considering annealing heat treatment

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