Effects of annealing on microstructure and deformation uniformity of Ti-22Al-24Nb-0.5Mo laser-welded joints

Jiao, Xiaohui; Kong, Beibei; Wang, Tao; Liu, Gang; Ning, Hanwei

doi:10.1016/j.matdes.2017.05.005

Cited by 19 publications

(8 citation statements)

References 30 publications

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“…Figure 2 illustrates the SEM and TEM images for the as-rolled Ti 2 AlNb alloy sheet. As shown in Figure 2a, there are two morphologies of O phase, that is the rim O phase around the α 2 phase and lath O phase embedded in a B 2 matrix [30], which can be further confirmed by the TEM observation as shown in Figure 2b Figure 3 presents the SEM images of the as-rolled and can-compressed samples with different height reductions. Figure 4 shows the SEM microstructures of the as-rolled alloy and can-compressed samples subject to annealing treatment at 900 °C for 2 h. It can be seen from Figure 3 that with the increment of height reduction during compression, the O phase and α2 phase were deformed and gradually elongated vertically to the compression direction in the B2 matrix.…”

Section: Methodssupporting

confidence: 53%

“…Figure 2 illustrates the SEM and TEM images for the as-rolled Ti2AlNb alloy sheet. As shown in Figure 2(a), there are two morphologies of O phase, that is the rim O phase around the α2 phase and lath O phase embedded in a B2 matrix [30], which can be further confirmed by the TEM observation as shown in Figure 2 [10]). The volume fractions of the different phases in the as-rolled sample were calculated by the Image-Pro Plus software using backscattered electron SEM micrographs, and the volume fraction of the α2, O, and B2 phases were estimated to be 5.7%, 42.5%, and 51.7%, respectively.…”

Section: Methodsmentioning

confidence: 52%

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Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Wang

Sun

et al. 2019

Metals

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The influence of height reduction on the microstructure evolution and mechanical properties of the Ti2AlNb-based alloy was investigated during canning compression and subsequent annealing. After the annealing treatment, the spheroidized B2 phase grains occurred because of partial recrystallization. Meanwhile, the texture evolution of the B2 phase and O phase were analyzed under the deformation degree, ranging from 25% to 75%. The results show that the mechanical properties of the post-annealed alloys were co-affected by the grain size and Schmid factor of the B2 phase. When the height reduction was less than 25%, the compression strength was mainly affected by the grain size. When the height reduction was higher than 50%, it was mainly dominated by the Schmid factor. When the deformation degree reached 75%, the recrystallized grain size decreased to 0.9 μm. Meanwhile, the Schmid factor of a {110}<001> slip system in B2 phase reduced to 0.34. Therefore, the yield strength of the Ti2AlNb alloy at room temperature increased from 892 MPa in the as-rolled condition to 935 MPa after the canning compression and annealing.

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Section: Methodssupporting

confidence: 53%

Section: Methodsmentioning

confidence: 52%

Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Wang

Sun

et al. 2019

Metals

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“…About 95.5% B2 phase and 4.5% α 2 phase could be found in FZ due to the huge heat input and the material remelting [ 28 ]. As previous researches reported, the phase composition of Ti-22Al-25Nb (at%) alloy was closely related with the cooling rate.…”

Section: Resultsmentioning

confidence: 99%

Effect of Multi-Pass Power Spinning on Microstructure Homogenization and Mechanical-Property Strengthening of Ti2AlNb-Based Alloy Using Welded Tube Blank

Wang

et al. 2022

Materials

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Long seamless tubes of Ti2AlNb-based alloys are difficult to manufacture through conventional forming methods. In this study, a multi-pass power spinning process was first utilized to fabricate thin-walled tube of Ti-22Al-24Nb-0.5Mo alloy using welded thick tube blank, assisted by on-line electro-magnetic induction heating to maintain high spinning temperature during the whole spinning process. After six-pass hot power spinning at 950 ± 30 °C, the microhardness difference of BM (base metal), HAZ (heat affect zone) and FZ (fusion zone) became much smaller, and the microhardness fluctuation ΔHV dropped to 32 from 122 of the as-welded joint due to the phase composition and microstructure homogenization. The grain size of B2 phase was refined to 0.4/0.6 μm from 2.7/10.8 μm of the as-received BM/FZ, respectively. Meanwhile, the B2 phase <111>B2//ND texture of the as-received rolled sheet weakened during multi-pass spinning due to recrystallization, which co-existed with <001>B2//ND texture in final pass. The ultimate tensile strength in axial/tangential direction was increased to 1245/1299 MPa from 1206/1010 MPa of the as-received rolled sheet, respectively, mainly due to the effect of fine grain strengthening. This study provides an effective way to manufacture high-performance tubular workpieces with low cost and high efficiency.

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“…During the welding, the gas flow rate was kept at 8 L/min. Initially, few welding tests were carried out to find suitable values of process parameters on the basis of good penetration and batter weldability [15,16]. From a large number of welding tests, four combinations of overlapping factor rates that had good penetration and superior weld qualities were selected.…”

Section: Laser Welding Proceduresmentioning

confidence: 99%

“…Due to this high amount of acicular martensite, the weld bead has a high hardness value. This results in reduced ductility [16,17]. Figure 6d shows the microstructural image of the near-HAZ.…”

Section: Microstructure Analysis On the Variation Of Overlapping Factormentioning

confidence: 99%

Effect of Pulsation in Microstructure and Mechanical Properties of Titanium Alloy-Annealed Welded Joints at Different Temperatures

Kumar¹,

Chattopadhyaya

Das

et al. 2023

Photonics

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Thin sheets of Ti-6Al-4V alloy of thickness 1 mm were butt welded using a pulsed Nd-YAG low-power laser setup. The goal of this research is to explore the influence of pulsation on the microstructure and mechanical properties. In addition to that, annealing at different temperatures has been performed to compare the results of pulsation and heat treatment. The results indicate that after annealing at 980 °C, the structure completely transformed into an equiaxed structure. When annealed at 1010 °C, almost the total area is composed of an equiaxed α phase, and the grains are coarse as compared to the previous. This suggests that the grain size becomes thicker when the annealing temperature is raised above 980 °C. The volume fraction of the equiaxed structure is maximum. It can be deduced that the volume–fraction is dependent on the annealing temperature. The volume fraction of the equiaxed structure increases as the annealing temperature increases. A higher tensile strength value of the sample annealed at 980 °C was found as compared with the overlapped sample (A-2). The fusion zone overlapped sample (A-2) shows high hardness with a value of 397 HV1. In the FZ sample, annealing at 980 °C has a hardness of 386 HV1. The (A-2) sample indicates higher (3–4%) hardness as compared to the annealed sample at the FZ. The β phase is increased by 16% in the XRD analysis of the overlapped samples. Hence, it is evident that the amount of β phase has increased during heating, and a complete transformation has taken place at a temperature of 958 °C.

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Effects of annealing on microstructure and deformation uniformity of Ti-22Al-24Nb-0.5Mo laser-welded joints

Cited by 19 publications

References 30 publications

Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Study on Microstructure Evolution and Mechanical Properties of Ti2AlNb-Based Alloy under Canning Compression and Annealing

Effect of Multi-Pass Power Spinning on Microstructure Homogenization and Mechanical-Property Strengthening of Ti2AlNb-Based Alloy Using Welded Tube Blank

Effect of Pulsation in Microstructure and Mechanical Properties of Titanium Alloy-Annealed Welded Joints at Different Temperatures

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