The grain-refinement mechanism during heavy cold-rolling of commercial-purity titanium

Mironov, S.; Zherebtsov, Sergey; Semiatin, S. L.

doi:10.1016/j.jallcom.2021.162689

Cited by 9 publications

(6 citation statements)

References 37 publications

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“…TEM observations revealed that multi-pass cold rolling to the thickness reduction of 90% resulted in a substantial refinement of both Ti 99.99% and Ti Grade 2 microstructure ( Figure 1 ). It is claimed that the presence of refined grains in the heavily cold-rolled hexagonal titanium is associated to the mechanical twinning that allow to create lamellar structure during early stage of deformation [ 15 , 29 ]. Further deformation steps lead to lamellas breakdown by both formation of longitudinal dislocation walls and transverse dislocation boundaries.…”

Section: Resultsmentioning

confidence: 99%

“…To increase the strength of CP Ti to a level of Ti alloys, its grain size refinement to an ultrafine-grained (UFG) regime (<1 µm) or a nanoscale (<100 nm) has been frequently applied in the last years [ 5 ]. This could be obtained by several plastic deformation techniques such as high-pressure torsion (HPT) [ 6 , 7 , 8 ], equal channel angular pressing (ECAP) [ 9 , 10 , 11 ], hydrostatic extrusion (HE) [ 12 , 13 ] or even a simple conventional cold rolling to large thickness reduction [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Stability and Mechanical Behavior of Ultrafine-Grained Titanium with Different Impurity Content

et al. 2023

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Ultrafine-grained (UFG) commercially pure (Ti Grade 2) and high-purity (Ti 99.99%) titanium can be a good alternative to less biocompatible Ti alloys in many biomedical applications. Their severe plastic deformation may lead to a substantial increase of strength, but their highly refined microstructure show a lower thermal stability which may limit their range of applications. The purpose of this study was to investigate the effect of interstitial elements on the thermal stability of UFG Ti Grade 2 and high-purity Ti 99.99% processed by a multi-pass cold rolling to the total thickness reduction of 90%. The severely cold rolled Ti sheets were annealed at temperature in the range of 100–600 °C for 1 h and, subsequently, they were evaluated in terms of microstructure stability, mechanical performance as well as heat effects measured by differential scanning calorimetry (DSC). It was found that the microstructure and mechanical properties were relatively stable up to 200 and 400 °C in the case of UFG Ti 99.99% and Ti Grade 2, respectively. DSC measurements confirmed the aforementioned results about lower temperature of recovery and recrystallization processes in the high-purity titanium. Surprisingly, the discontinuous yielding phenomenon occurred in both investigated materials after annealing above their thermal stability range, which was further discussed based on their microstructural characteristics. Additionally, the so-called hardening by annealing effect was observed within their thermal stability range (i.e., at 100–400 °C for UFG Ti Grade 2 and 100 °C for UFG Ti 99.99%).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Mechanical Behavior of Ultrafine-Grained Titanium with Different Impurity Content

et al. 2023

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“…The effects of rolling reductions on the microstructures and textures of rolled CP‐Ti have been extensively investigated in recent years. [ 2–4 ] The number of twins and grain sizes decreases with an increase in the rolling reduction. A high rolling reductions can promote dynamic recrystallization and lead to an ultrafine‐grained structure with high strengths.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, understanding the deformation mechanisms of deformations and developing effective rolling strategies are crucial for producing high-quality CP-Ti sheets.The effects of rolling reductions on the microstructures and textures of rolled CP-Ti have been extensively investigated in recent years. [2][3][4] The number of twins and grain sizes decreases with an increase in the rolling reduction. A high rolling reductions can promote dynamic recrystallization and lead to an ultrafine-grained structure with high strengths.…”

mentioning

confidence: 99%

Analysis of Microstructure, Texture Evolution, and the Mechanism of Grain Refinement of Commercially Pure Titanium During Cold Rolling: Experiment and Simulation

Sun,

Yang,

Liu

et al. 2023

Adv Eng Mater

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A comprehensive understanding of the microstructures and texture evolutions during the rolling process is of great significance for the preparations of high‐quality commercially pure titanium (CP‐Ti) sheets. Therefore, in the present work, the effects of rolling reductions on the microstructures and textures of CP‐Ti are investigated by optical microscope, electron backscatter diffraction, and X‐ray diffraction. A crystal plasticity finite element model (CPFEM) is developed to accurately predict the rolling deformation behaviors of CP‐Ti sheets. The results show that the slip and twinning including , compression twins and extension twins are prone to plastic deformations during the whole rolling process. The c‐axes of grains gradually tilt toward the transverse direction and the grains gradually deviate from the original //rolling direction (RD) to //RD. As a result, the mixed textures of and are developed in the specimen. The grain refinements are closely linked with the developments of and twins. In addition, the twin fractions and texture evolutions are well predicted by the CPFEM model. These results documented in this work should not only help to elucidate the microstructures and texture evolutions of CP‐Ti, but also shed important light on improving its properties.

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“…Cold ring rolling (CRR), as an advanced process for bearing ring forming, because of its advantages in microstructure refinement [1], has been applied in the manufacturing of aviation bearing rings [2][3][4][5][6]. However, as a non-uniform plastic deformation process, CRR will inevitably lead to uneven distribution of stress and microstructure in the rolling section [7,8], which may deteriorate the service life of bearings [9].…”

Section: Introductionmentioning

confidence: 99%

Homogenization of residual stress in the raceway of cold rolled M50 bearing ring via electromagnetic shocking treatment

Qian

Liu²,

Wang³

et al. 2023

Mater. Res. Express

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The uneven residual stress caused by cold rolling on the raceway seriously affect the distortion and performance of bearing rings. Here, a novel strategy of electromagnetic shocking treatment (EST) was proposed to regulate the distribution of residual stress in the raceway of cold rolled M50 bearing ring. The results indicate that the distribution of residual stress and local micro-strain along the raceway of the cold rolled ring become more homogenized after EST, leading to the homogenization of hardness along the whole cross section. In addition, attributed to the “targeted” regulation effect of EST, the small angle grain boundaries and the texture also become uniform along the raceway.

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The grain-refinement mechanism during heavy cold-rolling of commercial-purity titanium

Cited by 9 publications

References 37 publications

Thermal Stability and Mechanical Behavior of Ultrafine-Grained Titanium with Different Impurity Content

Thermal Stability and Mechanical Behavior of Ultrafine-Grained Titanium with Different Impurity Content

Analysis of Microstructure, Texture Evolution, and the Mechanism of Grain Refinement of Commercially Pure Titanium During Cold Rolling: Experiment and Simulation

Homogenization of residual stress in the raceway of cold rolled M50 bearing ring via electromagnetic shocking treatment

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