Phase transformation behavior of Ti-1023 under static heat treatment and dynamic thermo-mechanical coupling

Wang, Qingjuan; Chao, Yang; Wu, Jincheng; Gao, Beite; He, Zeen; Wang, Kuaishe

doi:10.1016/j.matchar.2022.112248

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Li et al reported the dynamic α→β transformation of Ti-5Al-5V-5Mo-1Cr-1Fe β titanium alloy, the chemical composition of which is considerably similar to that of the Ti-5553 alloy, could occur during the hot compression in α + β field [ 16 ]. Interestingly, the dynamic α→β transformation of β titanium alloys during the sub-transus themalmechanical processing has also be been reported in Ti-10V-2Fe-3Al alloy, Ti-6Cr-5Mo-5V-4Al alloy, and Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy [ 15 , 17 , 18 ]. Since the large-scale billet could not be cooled to room temperature at the high cooling rate that is the same as the water-quenching of the small-scale specimen, it is hard to characterize the microstructure of the billet that is immediately after α + β field forging.…”

Section: Discussionmentioning

confidence: 95%

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Qin

Liu

2023

Materials

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In order to fabricate homogeneous large-scale Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy bulk with fine and equiaxial β grain, we performed a series of multi-axial α + β field forging with 62 forging cycles on the large-scale Ti-5553 billet by using 12.5 MN high-speed hydraulic press. The β-annealed microstructure was the starting microstructure of the billet. After the 6th forging cycle, β grain deformed dramatically, and the grain-boundary network developed within the irregular β grain. As the forging cycle increased to 44, the volume fraction of the fine and equiaxial β grain that is less than 20 μm, which is caused by dynamic recrystallization, increased gradually. However, the incomplete dynamic recrystallization region within the original β grain could not be eliminated. As the forging cycle further increased, the volume fraction of the fine and equiaxial β grain did not increase. In contrast, the abnormal grain growth of the β phase occurred during 50th~62nd forging cycle. Here, we attribute the formation of the incomplete dynamic recrystallization region and the abnormal grain growth of the β phase to the high deformation rate of the α + β forging. The refining behavior of β grain and the abnormal coursing β grain, which is found during the multi-cycle multi-axial forging of large-scale Ti-5553 alloy billet, are seldom reported in the isothermal compression of small-scale Ti-5553 alloy specimen. The findings of the paper are instructive for improving the sub-transus forging strategy that is used to fabricate the large-scale homogeneity Ti-5553 alloy billet with fine and equiaxial β grain.

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Section: Discussionmentioning

confidence: 95%

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Qin

Liu

2023

Materials

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“…The higher the homogenization HT temperature, the faster the initial increase in Fe element content, and the slower the subsequent increase at the end of the HT. (2) The Fe content at the grain boundaries decreases with increasing homogenization HT time. During homogenization HT, the high temperature accelerates the diffusion rate of atoms, making the dendritic segregation gradually disappear [42].…”

Section: Sample#mentioning

confidence: 98%

“…Ti-1023 is a typical near-beta Ti alloy with a beta transit temperature of 795 • C and has high fracture toughness, deep hardening potential and inherent ductility [1][2][3]. It is mainly used in the manufacturing of large load-bearing components such as aircraft fuselages, helicopter rotors and landing gears [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Distributions of Fe content in grain during homogenization HT of Ti-1023 at the temperature of 1200 °C.Fe content distributions at different positions in the grain during homogenization HT of Ti-1023 are shown in Figure13. It can be seen that: (1) At a certain HT temperature, the Fe content at different distances from the grain center approaches the average value over time (2). When the HT temperature is high, such as 1200 °C, the Fe content at different distances from the grain center exhibits a nonlinear change with time, following a concave curve.…”

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confidence: 99%

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Effects of Homogenization Heat Treatment on the Fe Micro-Segregation in Ti-1023 Titanium Alloy

et al. 2023

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The segregation of the Fe element in Ti-10V-2Fe-3Al titanium alloy (Ti-1023) can lead to the generation of beta flecks, which seriously affects the performance of Ti-1023 products. During the heat treatment (HT) process at a high temperature, the Fe element in Ti-1023 ingots will migrate, making its distribution more uniform and reducing the segregation index. In this paper, the control of Fe micro-segregation in Ti-1023 ingots by homogenization HT was investigated. Firstly, dissection sampling and SEM-EDS analysis methods were used to study the distribution pattern of the Fe element in the equiaxed grains in the core of Ti-1023 ingots. It was found that the Fe content in the grain gradually increased along with the radial direction from the core to the grain boundary. Then, the homogenization HT experiments and numerical simulations of Ti-1023 at different HT temperatures from 1050 °C to 1200 °C were carried out. The results showed that the uniformity of Fe element distribution within grain can be significantly improved by the homogenization HT. With increasing HT temperature, Fe atoms migration ability increases, and the uniformity of Fe element distribution improves. Homogenization HT at 1150 °C and 1200 °C for 12 h can effectively reduce the degree of Fe element segregation.

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Thermal Deformation Behavior and Microstructural Evolution Mechanism of TC4 Titanium Alloy Based on Hot Processing Map

Li,

Wang,

et al. 2024

JOM

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Phase transformation behavior of Ti-1023 under static heat treatment and dynamic thermo-mechanical coupling

Cited by 7 publications

References 26 publications

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Effects of Homogenization Heat Treatment on the Fe Micro-Segregation in Ti-1023 Titanium Alloy

Thermal Deformation Behavior and Microstructural Evolution Mechanism of TC4 Titanium Alloy Based on Hot Processing Map

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