Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 °C

Narayana, P.L.; Kim, Seong-Woong; Hong, Jae‐Keun; Reddy, N.S.; Yeom, Jong‐Taek

doi:10.1016/j.msea.2018.01.113

Cited by 79 publications

(19 citation statements)

References 16 publications

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“…In recent years, as the flight speed and distance of air vehicles increase significantly, traditional titanium alloys such as TC4, TA15 cannot cover the operating requirements. High-temperature titanium alloys possess excellent mechanical properties at high temperature, and the service temperature of these alloys is increased to above 873 K [5][6][7]. Due to these excellent performances, high-temperature titanium alloys have become advanced materials in aerospace applications, such as the components of aircraft engines, wings and rudders [8].…”

Section: Introductionmentioning

confidence: 99%

Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

Wang

Sun

et al. 2020

Metals

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The joining of high-temperature titanium alloy is attracting much attention in aerospace applications. However, the defects are easily formed during laser welding of titanium alloys, which weakens the joint mechanical properties. In this work, laser oscillating welding was applied to join TC31 high-temperature titanium alloy. The weld appearance, microstructure and mechanical properties of the laser welds were investigated. The results show that sound joints were formed by using laser oscillating welding method, and a large amount of martensite was presented in the welds. High mechanical properties were achieved, which was approaching to (or even equaled) the strength of the base material. The joints exhibited a tensile strength of up to 1200 ± 10 MPa at room temperature and 638 ± 6 MPa at 923 K. Laser oscillating welding is beneficial to the repression of porosity for welding high-temperature titanium alloy.

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Section: Introductionmentioning

confidence: 99%

Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

Wang

Sun

et al. 2020

Metals

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“…Titanium alloys with exceptional properties of specific strength, creep strength, thermal resistance, corrosion resistance and workability have been developed for high-temperature applications up to 600 • C, such as in compressor disks and the blades of gas turbines in advanced jet engines [1,2]. With increases in the service temperature, the Al equivalent ([Al]eq) of common high-temperature titanium alloys, such as Ti-1100 [3], IMI834 [4] and Ti600 [5], reach the critical value, and the contents of the α stabilizing element and the neutral element have no room to adjust.…”

Section: Introductionmentioning

confidence: 99%

In-Situ SEM Observation on Fracture Behavior of Titanium Alloys with Different Slow-Diffusing β Stabilizing Elements

Zhang¹,

Xie²,

Hui³

et al. 2020

Materials

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The fracture-behaviors of two Ti-Al-Sn-Zr-Mo-Nb-W-Si alloys with different slow-diffusing β stabilizing elements (Mo, W) were investigated through in-situ tensile testing at 650 • C via scanning electron microscopy. These alloys have two phases: the α phase with hcp-structure (a = 0.295 nm, c = 0.468 nm) and the β phase with bcc-structure (a = 0.332 nm). Three-dimensional atom probe (3DAP) results show that Mo and W mainly dissolve in the β phase, and they tend to cluster near the α/β phase boundary. Adding more slow-diffusing β stabilizing elements can improve the ultimate tensile strength and elongation of the alloy at 650 • C. During tensile deformation at 650 • C, microvoids mainly initiate at α/β interfaces. With increases in the contents of Mo and W, the β phase content increases and the average phase size decreases, which together have excellent accommodative deformation capability and will inhibit the microvoids' nucleation along the interface. In addition, the segregation of Mo and W near the α/β interface can reduce the diffusion coefficient of the interface and inhibit the growth of microvoids along the interface, which are both helpful to improve the ultimate tensile strength and plasticity.

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“…Conventional near-alpha Ti alloys are strengthened by fine alpha2 phase with DO 19 structure and intermetallic silicides [7][8]. Up to now, numerous works were focused on the influence of alpha stabilizing alloying elements such as Ga, Sn, Hf and Zr on the high temperature mechanical properties of the near-alphaa titanium alloys [9][10]12]. These studies demonstrated that the solid solution strengthening and the formation of a 2 phase are effective in improving high temperature strength, but degrade the ductility of the material [10][11] probably due to the lower symmetry of its DO 19 crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Role of refractory elements in near-alpha titanium alloys on high temperature mechanical properties

et al. 2020

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The effect of Tungsten (W), Tantalum (Ta) and simultaneous addition of Germanium (Ge) and Silicon (Si) on the microstructure evolution, tensile and creep properties of the near-alpha alloy Ti-5.7Al-3.9Sn-3.7Zr-0.7Nb-0.5Mo-0.35Si-0.05C have been investigated at high temperatures up to 650°C. Microstructural characterizations following solution treatment at 1050°C for 2 hours with oil quenching and aging treatment at 700°C for 2 hours followed by air cooling, highlighted that the additions of refractory elements such as W and Ta led to a decrease of both the volume fraction of the primary alpha phase (ap) and its average size. Tensile tests performed up to 650°C revealed a significant improvement in tensile strength with additions of W and Ta, even though a decrease of ductility has been also detected. Creep tests carried out at 600°C under a constant stress of 200 MPa pointed out that, refractory elements, Ge and Si have a beneficial effect on both primary and steady-state creep strain rates.

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Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 °C

Cited by 79 publications

References 16 publications

Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

In-Situ SEM Observation on Fracture Behavior of Titanium Alloys with Different Slow-Diffusing β Stabilizing Elements

Role of refractory elements in near-alpha titanium alloys on high temperature mechanical properties

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Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 °C

Cited by 79 publications

References 16 publications

Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

In-Situ SEM Observation on Fracture Behavior of Titanium Alloys with Different Slow-Diffusing β Stabilizing Elements

Role of refractory elements in near-alpha titanium alloys on high temperature mechanical properties

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Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 °C