Microstructure Characterization of Laser Welded Near-β Titanium Alloy ‘TLM’ under Different Process Conditions

Buddery, Alexander; Wang, Gui; Yu, Zeyang; Dargusch, Matthew S.; Nabulsi, Samih

doi:10.4028/www.scientific.net/msf.654-656.2146

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…However, after LBW, the beta titanium alloy weld has a coarse dendritic structure, and the reinforcing phase α phase melts back into the β phase substrate, making precipitation difficult, leading to a decrease in strength and plasticity. It is difficult to improve its properties by adjusting the welding process and appropriate post-welding heat treatment, which limits further development and wide application of beta titanium alloys in various fields [10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Wang,

Dong,

Chai

et al. 2024

Metals

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Aiming at the problem of deterioration of the properties of beta titanium alloy welded joints due to many porosity defects and coarse grains, multi-vibrator ultrasonic-assisted laser welding (M—ULW) technology was used to improve the structure and properties of beta titanium alloy welded joints. The microstructure evolution, tensile strength, elongation, and fracture behavior of the weld joint were studied through scanning electron microscopy, electron back-scatter diffraction, and a universal testing machine. The results show that ultrasonic vibration has no effect on the phase composition of titanium alloy welds during ultrasonic-assisted laser welding. However, it caused all grains in the weld to be transformed into equiaxed grains, and the higher the amplitude, the finer and more uniformly distributed were the equiaxed grains. When the ultrasonic amplitude reached 20 μm, the fine equiaxed crystals were uniformly distributed throughout the weld, and the average grain size of the weld was 56.15 um, which is only one-third of that of the unultrasonicated laser welded joint. Ultrasonic refinement makes the joint grain size decrease, weakens the beta titanium alloy {200} direction weaving, increases the dislocation density within the weld; and increases the tensile strength of the welded joint. The tensile strength of the welded joints exceeded that of the base material by 907 MPa, and the elongation was significantly increased by a factor of 1.8 compared with that of the un-ultrasonicated laser welded joints, resulting in a shift of the fracture location from the center of the weld to the heat-affected zone.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Wang,

Dong,

Chai

et al. 2024

Metals

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Study on Laser Welding Technology and Properties of Ti75 Titanium Alloy

Cao

Liu

et al. 2020

J. Phys.: Conf. Ser.

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For Ti75 titanium alloy with a thickness of 3mm, 10kW continuous fiber laser was used to conduct lap test on the material. By adjusting the reserved gap between two plates, laser power, welding speed and defocusing amount, the macroscopic morphology and microstructure characteristics of the welded joint were analyzed, and the tensile properties and micro-hardness of the welded joint were tested. The results show that, under the appropriate process parameters, the weld of the specimens is beautiful and the degree of oxidation is low, the tensile strength of the welded joint can reach the level of the base material, and the hardness value is higher than the base material. By adjusting laser welding parameters such as laser power, welding speed and defocusing amount, welding joint quality can be effectively controlled.

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Microstructure Characterization of Laser Welded Near-β Titanium Alloy ‘TLM’ under Different Process Conditions

Cited by 2 publications

References 4 publications

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Study on Laser Welding Technology and Properties of Ti75 Titanium Alloy

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