Mechanical property and characterization of TA1 titanium alloy sheets welded by vacuum electron beam welding

Su, Molin; Liu, Ke-Gao; Qi, Wenjuan; Weng, Fei; Zhang, Yuanbin; Li, Ji-Shuai

doi:10.1016/j.vacuum.2018.10.027

Cited by 19 publications

(8 citation statements)

References 28 publications

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“…This strengthened the TiAl solid solution and enhanced Vickers hardness. The importance of solid solution strengthening in Vickers hardness has been reported in previous literature [28]. At higher temperatures, the B2 phase decomposed into α2 and O, in which both plasticity and toughness of the α2 and O phases were better than those of the B2 phase.…”

Section: Microhardness Distributionsupporting

confidence: 61%

Spark Plasma Diffusion Bonding of TiAl/Ti2AlNb with Ti as Interlayer

Zhang

Chen

et al. 2020

Materials

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To solve the problem of poor weldability between TiAl-based and Ti2AlNb-based alloys, spark plasma diffusion bonding was employed to join a TiAl alloy and a Ti2AlNb alloy with a pure Ti foil as interlayer at 950 °C/10 KN/60 min. After welding, slow cooling was carried out at a rate of 5 °C/min, followed by homogenization at 800 °C for 24 h. The microstructural evolution and elemental migration of the joint were analyzed via a scanning electron microscope equipped with an energy dispersive spectrometer, while the mechanical properties of the joint were assessed via microhardness and tensile tests. The results show that the spark plasma diffusion bonding formed a joint of TiAl/Ti/Ti2AlNb without microcracks or microvoids, while also effectively protecting the base metal. Before heat treatment, the maximum hardness value (401 HV) appeared at the Ti2AlNb/Ti interface, while the minimum hardness value (281 HV) occurred in the TiAl base metal. The tensile strength of the heat-treated joint at room temperature was measured to be up to 454 MPa, with a brittle fracture occurring in the interlayer. The tensile strength of the joint at 650 °C was measured to be up to 538 MPa, with intergranular cracks occurring in the TiAl base metal.

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Section: Microhardness Distributionsupporting

confidence: 61%

Spark Plasma Diffusion Bonding of TiAl/Ti2AlNb with Ti as Interlayer

Zhang

Chen

et al. 2020

Materials

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“…The intensity distributions of the {0001}, {11-20} and {10-10} pole figures of the a-phase are shown in Figure 22 for rectangular EB pattern and triangular EB pattern. Rectangular EB pattern showed strong texture of basal plane (0001) and prismatic plane (01-10), which is parallel to the rolling direction while in triangular EB pattern the basal texture is not significantly pronounced in rolling direction, while prismatic (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) and pyramidal planes (01-10) texture can be seen (Figure 22). These different orientations indicate different slip mechanism under tensile loading, which is dependent on grain orientation, with respect to the applied load and is represented by Schmid factor (m) and critical resolve shear stress value of that slip system.…”

Section: Texture Analysismentioning

confidence: 99%

“…14 A comprehensive review of EBW process is given by Vadolia et al 15 EBW is used to weld titanium alloys due to concentrated energy, high power density and more weldable thickness range. 16,17 In EBW, variable sizes and geometries of the work pieces can be easily welded due to the greater working distance as compared to other welding techniques, that is, TIG and LBW. 18 The requirement of high vacuum had limited the use of EBW commercially; however, the technological developments with time has made it possible to use this process at medium and low vacuum, which has drastically increased its usage in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of electron beam oscillation patterns on the microstructure, texture, residual stress and mechanical properties of Ti-5Al-2.5Sn alloy weldments

Iltaf

Junaid

Khan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Vacuum electron beam welding is widely employed for the welding of titanium alloys using different beam oscillation patterns. Since these patterns influence the physical phenomenon in the weld pool, its effect on the microstructure, texture, mechanical properties and residual stresses is of prime interest. In order to understand this influence, electron beam welding was used to prepare Ti-5Al-2.5Sn weldments using beam oscillations of triangular and rectangular waveform. It was observed that a change of welding pattern had a strong influence on the residual stresses, impact properties and texture of weld zone while tensile properties were not significantly affected. A partial martensitic transformation was observed in both the triangular and rectangular waveform of oscillations. An increase in alpha lathe width was observed in the fusion zone and similar strength of the rectangular pattern as compared to triangular pattern. Despite of this, the observed higher Vickers hardness of the fusion zone of rectangular pattern as compared to triangular and no-oscillation was attributed to texture strengthening using rectangular waveform.

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“…Electrolytic copper foil is one of the important materials for manufacturing copper-clad laminate (CCL) and printed circuit boards (PCB) [ 1 , 2 ]. In recent years, due to the rapid development of science and technology in the downstream industry, higher requirements have been put forward for the upstream electrolytic copper foil.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Novel Complex Treatment of Annealing and Sandblasting on the Microstructure and Performance of Welded TA1 Titanium Plate

Xü

Wang

et al. 2023

Materials

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The welding titanium cathode roller has the obvious advantages of low cost, high efficiency, and no diameter restriction. Unfortunately, the longitudinal weld on the cathode roller adversely impacts the quality of the electrolytic copper foil due to the great difference between the microstructure of the weld zone and the base metal. Thus, it is crucial to reduce their difference by regulating the microstructure of the weld zone. In this study, a novel complex treatment of heat treatment and sandblasting is primarily developed for regulating the microstructure of the weld zone. The results show that the novel complex treatment has an efficient effect on regulating the microstructure of the weld zone and making the microstructure in the weld zone close to that of the base metal. During vacuum annealing, the microstructure of the weld zone is refined to some degree, and 650 °C annealing has the optimal effect, which can effectively reduce the ratio of α phase’s length to width and reduce the microstructure difference between the weld zone and the base metal. At the same time, with an increase in the annealing temperature, the tensile strength and yield strength decreased by about 10 MPa; the elongation after fracture increased by 20%; the average microhardness of the WZ and the HAZ decreased by about 10 HV0.10; and that of the BM decreased by about 3 HV0.10. The heat treatment after welding can effectively adjust the properties of the weld zone, reduce the hardness and strength, and improve the toughness. The subsequent sandblasting after annealing can further refine the grain size in the weld zone and make the microstructure in the weld zone close to that of the base metal. Sandblasting after annealing can further refine the grain in the weld zone and make the microstructure in the weld zone close to that of base metal. Meanwhile, an application test confirmed that the adverse impact of a longitudinal weld on the quality of electrolytic copper foil could be resolved by adopting this novel complex treatment. Therefore, this study provides valuable technical support for the “welding” manufacturing of the titanium sleeves of the cathode roller.

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Mechanical property and characterization of TA1 titanium alloy sheets welded by vacuum electron beam welding

Cited by 19 publications

References 28 publications

Spark Plasma Diffusion Bonding of TiAl/Ti2AlNb with Ti as Interlayer

Spark Plasma Diffusion Bonding of TiAl/Ti2AlNb with Ti as Interlayer

Influence of electron beam oscillation patterns on the microstructure, texture, residual stress and mechanical properties of Ti-5Al-2.5Sn alloy weldments

The Effect of Novel Complex Treatment of Annealing and Sandblasting on the Microstructure and Performance of Welded TA1 Titanium Plate

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