Quantitative Phase Field Simulation of α Particle Dissolution in Ti–6Al–4V Alloys Below β Transus Temperature

Yang, Mei; Wang, Gang; Liu, Tao; Zhao, Wenhua; Xu, Dongsheng

doi:10.1007/s40195-017-0562-y

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…In this case, recrystallization and/or grain growth may occur for the major phase (a-Ti) through migration of high angle boundaries (HABs) along with texture modifications [15]. In the meantime, the hightemperature annealing can also lead to composition variation of the metastable b phase, which may become unstable and then transform into a phase during subsequent cooling [16][17][18][19]. In-depth and detailed investigations on such microstructural and textural characteristics should be able to shed some light on optimizing heat treatment regimes for the dual-phase Ti alloy.…”

Section: Introductionmentioning

confidence: 99%

EBSD Study of Microstructural and Textural Changes of Hot-Rolled Ti–6Al–4V Sheet After Annealing at 800 °C

Xia

Chai

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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In this paper, electron backscatter diffraction and various other characterization and analysis techniques including X-ray diffraction, electron channeling contrast imaging and energy-dispersive spectrometry were jointly employed to investigate microstructural and textural changes of a hot-rolled Ti-6Al-4V (TC4) sheet after annealing at 800°C for 5 h. In addition, the hardness variation induced by the annealing treatment is rationalized based on revealed microstructural and textural characteristics. Results show that the TC4 sheet presents a typical dual-phase (a ? b) microstructure, with a-Ti as the major phase and short-rod-shaped b-Ti (minority) uniformly distributed throughout the a matrix. Most of a grains correspond to the un-recrystallized structures with a typical rolling texture (c//TD and \11-20[//ND) and dense low angle boundaries (LABs). After the annealing, the stored energy in the as-received specimen is significantly reduced, along with greatly decreased LABs density. Also, the annealing allows recrystallization and grain growth to occur, leading to weakening of the initial texture. Furthermore, the water quenching immediately after the annealing triggers martensitic transformation, which makes the high-temperature b phases be transformed into submicron a plates. The hardness of the annealed specimen is 320.5 HV, lower than that (367.0 HV) of the as-received specimen, which could be attributed to reduced LABs, grain growth and weakened texture. Nevertheless, the hardening effect from the fine martensitic plates could help to suppress a drastic hardness drop.

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Section: Introductionmentioning

confidence: 99%

EBSD Study of Microstructural and Textural Changes of Hot-Rolled Ti–6Al–4V Sheet After Annealing at 800 °C

Xia

Chai

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Modelling the Competitive Growth of Primary, Allotriomorphic, and Secondary Alpha in Ti-6Al-4V

Buzolin

Weiß

Krumphals³

et al. 2020

Metall Mater Trans A

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The competitive formation of allotriomorphic α along the prior β grain boundaries, secondary α-phase and the growth of globular primary α is described for the Ti-6Al-4V alloy during continuous cooling. The formation kinetics of the different morphologies of the α-phase is related to the nucleation rate of allotriomorphic α and secondary α as well as with the V supersaturation at the β matrix. A mesoscale physical model is developed for the allotriomorphic α and secondary α based on classical nucleation and growth of platelets. The growth of the primary α is modelled as the growth of a spherical particle embedded in a supersaturated β matrix. Continuous cooling tests at two different holding temperatures in the α+β field, 930 °C and 960 °C, and five different cooling rates, 10, 30, 40, 100 and 300 °C/minutes, are conducted. Additionally, interrupted tests are conducted at different temperatures to determine the progress of growth of primary α and formation of allotriomorphic and secondary α-phases during cooling. The size of primary α increases, while its circularity decreases with decreasing cooling rate. The area fractions of primary α decrease with increasing cooling rate and increasing holding temperature. Moreover, the lower the cooling rate, the thicker the plates of allotriomorphic α and secondary α. The growth of primary α, as well as the formation of allotriomorphic α plates is observed at the beginning of the cooling stage. The formation of secondary α occurs at last and is nearly negligible for very low cooling rates. The model is able to accurately predict the different α-phase formation behaviours and the obtained results show good agreement with the experimental ones.

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Dissolution kinetics of irregular second phase in as-cast Cu-Ti alloys via a multi-particle dissolution model

Xiao

Shi²,

Du³

et al. 2021

Computational Materials Science

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Quantitative Phase Field Simulation of α Particle Dissolution in Ti–6Al–4V Alloys Below β Transus Temperature

Cited by 5 publications

References 28 publications

EBSD Study of Microstructural and Textural Changes of Hot-Rolled Ti–6Al–4V Sheet After Annealing at 800 °C

EBSD Study of Microstructural and Textural Changes of Hot-Rolled Ti–6Al–4V Sheet After Annealing at 800 °C

Modelling the Competitive Growth of Primary, Allotriomorphic, and Secondary Alpha in Ti-6Al-4V

Dissolution kinetics of irregular second phase in as-cast Cu-Ti alloys via a multi-particle dissolution model

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