Microstructure and Texture Evolution During Sub-Transus Thermomechanical Processing of Ti-6Al-4V-0.1B Alloy: Part I. Hot Rolling in (α + β) Phase Field

Roy, Shibayan; Suwas, Satyam

doi:10.1007/s11661-013-1672-4

Cited by 56 publications

(12 citation statements)

References 49 publications

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“…A lot of tiny secondary α phase (α s ) precipitates in β matrix, Figure 2, which can be attributed to the promoting effect of distortion en-ergy in β phase on the precipitation of α s [26]. Compared with the as-received microstructure, Figure 1, many equiaxed α grains are elongated along the TD direction after rolling, which is similar to the results of previous experiments [27,28]. In addition, the α grain size distribution is nearly uniform and the α grain boundaries are smooth with limited penetration of the β phase into the elongated α grains, which suggests that a little dynamic recrystallization and globularization occurs during rolling.…”

Section: Rolled Microstructuresupporting

confidence: 86%

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Xin

Wang

Yan

et al. 2019

Materialwissenschaft Werkst

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A homogeneous equiaxed‐structure TC21 titanium alloy is hot rolled and annealed for different time ranging from 1 h to 6 h. The grain morphology and texture evolution of α and β phases during annealing are mainly investigated using the electron back‐scattered diffraction characterization. In the early annealing stage, the α grain mainly maintains the elongated morphology generated in the rolling. With increasing annealing time, more and more elongated α grains become equiaxed due to enhanced static recrystallization and boundary splitting. Differently, the β grain exhibits a fully equiaxed morphology all the time due to the sufficient static recrystallization, and get a coarsening with increasing annealing time. The α phase exhibits a (0001) basal texture in the early annealing stage, and then forms a TD‐split texture with increasing annealing time. The β phase exhibits the {001}<110> texture at every annealing time. Based on the analysis about the texture of different grain sizes, the effects of recrystallization nucleation and oriented growth on texture evolution are discussed. It suggests that TD‐split texture in α phase is originated from both the recrystallization nucleation and oriented growth. The formation of {001}<110> texture in β phase is mainly originated from the oriented growth.

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Section: Rolled Microstructuresupporting

confidence: 86%

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Xin

Wang

Yan

et al. 2019

Materialwissenschaft Werkst

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“…In higher magnification BSE micrographs, both α s and β phases appear clearly, as indicated with red dotted lines in Figure b. The equiaxed, low aspect ratio α p grains suggest microstructural conversion by globularization, from lamellar to equiaxed morphology, during TMT . Important to note that a complete globularization would mean the equiaxed α p grains completely surrounded by prior β phase, which most often makes the aspect ratio <2 for these globularized α p grains .…”

Section: Resultsmentioning

confidence: 95%

“…The micro ‐ texture measurement by EBSD (Euler angle map shown in Figure ) suggests that neighboring α p ‐ grains, being part of the same ( α + β ) ‐ colony in the starting rolled microstructure, most often share a common orientation after static annealing. The orientation of the α p ‐ phase between different starting ( α + β ) ‐ colony differs insignificantly due to the strong crystallographic texture after rolling and annealing . The α s ‐ phase generally acquires an orientation in accordance to the neighboring α p grains .…”

Section: Resultsmentioning

confidence: 99%

“…The α / β transus temperature was measured to be ≈1040 °C for this alloy . Sub ‐ β transus TMT was performed by hot ‐ rolling the alloy at 700 °C up to 90% thickness reduction, followed by isothermal annealing at 900 °C for 90 min in argon atmosphere, to produce the bimodal microstructure . Air cooling was employed at the end of both hot ‐ rolling and annealing operations.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

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Indentation Response and Structure‐Property Correlation in a Bimodal Ti–6Al–4V Alloy

2017

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Understanding the deformation behavior of multi-phase alloys under external loading requires careful mechanical characterization of the individual constituent phases at various length scales. The present study first evaluates the elastic moduli and hardness of the microstructural constituents viz. primary a (a p ) and transformed b (secondary a (a s ) plus retained prior b) phases in a bimodal Ti-6Al-4V alloy by nanoindentation using different loads. The bulk mechanical properties of the overall microstructure are then determined by grid wise nano-indentation, as well as micro-indentation. The alloy shows a pronounced indentation size effect; the hardness increases with the decrease in indentation load, or depth of penetration. Assuming an iso-stress condition for individual constituents (a p and transformed b) in the rule of mixture approach, the bulk mechanical properties of the Ti-6Al-4V alloy are reasonably predicted. Such prediction of bulk properties, however, is not possible when a similar calculation is performed using iso-strain condition. The transformed b phase shows disparity between the estimated and experimental values, while considering the a s and b phases individually, on both iso-stress and iso-strain assumptions. From these results, the influence of individual microstructural phases (size, distribution, volume fraction, morphology) and the interfaces between them, is found key in controlling the overall bulk mechanical response of the alloy system. KeywordsNano and micro-indentation, bimodal Ti-6Al-4V, indentation size effect, rule of mixture, iso-stress and iso-strain, grain boundary and interface

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“…And the better understanding of texture forming mechanism induced by every step would be helpful to the establishment of more physically based process modeling. Texture evolution during the hot deformation process has been investigated by previous studies [9][10][11] . As for phase transformation textures, many researchers mainly focused on the variant selection mechanisms during the cooling from above the β transus.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Heat Treatment on the Evolution of Microstructure and Texture in Ti80 Hot Rolled Pipe

Zeng

et al. 2022

Mat. Res.

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In this study, the microstructure and texture evolution of hot rolled Ti80 pipe annealing at 960°C and 990°C in α+β two-phase field have been investigated. The results showed that the dissolution of α phases induced the increase of texture components of primary α phases (α P ) and the α P were the main factors that determine the final texture at 960°C. At 960°C, the microtextures of secondary α phases (α S ) were very close to that of α P . As the annealing temperature increased to 990 °C, the main factors affecting the microtextures of α S changed from the α P to the recrystallized β grains. The textures of β phases were greatly influenced by the annealing temperature. The β phases at high temperature were not mainly from the grow up of residual β phases. It was formed by the transformation of α phases at room temperature. Consequently, this study could provide some ideas for decreasing the texture intensities of hot rolled Ti80 pipes, such as reducing the area of α colonies before rolling, scattering the crystal orientations of α P , and controlling the size of recrystallized β grains.

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Microstructure and Texture Evolution During Sub-Transus Thermomechanical Processing of Ti-6Al-4V-0.1B Alloy: Part I. Hot Rolling in (α + β) Phase Field

Cited by 56 publications

References 49 publications

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Indentation Response and Structure‐Property Correlation in a Bimodal Ti–6Al–4V Alloy

The Effect of Heat Treatment on the Evolution of Microstructure and Texture in Ti80 Hot Rolled Pipe

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