Effect of cold rolling process on microstructure and mechanical properties of high strength β titanium alloy thin sheets

Ma, Yan; Du, Zhongjie; Cui, Xiaoming; Cheng, Jianwei; Liu, Guolong; Gong, Tianhao; Liu, Huimin; Wang, Xiaopeng; Chen, Yuyong

doi:10.1016/j.pnsc.2018.10.004

Cited by 19 publications

(7 citation statements)

References 22 publications

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“…In the past decades, the demand for structural materials possessing high strength, high plasticity and high corrosion resistance increased due to the rapid development in modern industries, where such combination of properties is demanded, i.e., automotive and aeronautical industry [1][2][3][4][5][6][7]. Titanium alloys proved that they can satisfy all imposed demands if an appropriate thermomechanical processing route is applied [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, above β-transus, Ti-6246 Alloy

Alluaibi

Cojocaru

Rusea³

et al. 2020

Metals

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The present study investigates the influence of hot-deformation, above β-transus and different thermal treatments on the microstructural and mechanical behaviour of a commercially available Ti-6246 titanium-based alloy, by SEM (scanning electron microscopy), tensile and microhardness testing techniques. The as-received Ti-6246 alloy was hot-deformed—HR by rolling, at 1000 °C, with a total thickness reduction (total deformation degree) of 65%, in 4 rolling passes. After HR, different thermal (solution—ST and ageing—A) treatments were applied in order to induce changes in the alloy’s microstructure and mechanical behaviour. The applied solution treatments (ST) were performed at temperatures below and above β-transus (α → β transition temperature; approx. 935 °C), to 800 °C, 900 °C and 1000 °C respectively, while ageing treatment at a fixed temperature of 600 °C. The STs duration was fixed at 27 min while A duration at 6 h. Microstructural characteristics of all thermomechanical (TM) processed samples and obtained mechanical properties were analysed and correlated with the TM processing conditions. The microstructure analysis shows that the applied TM processing route influences the morphology of the alloy’s constituent phases. The initial AR microstructure shows typical Widmanstätten/basket-weave-type grains which, after HR, are heavily deformed along the rolling direction. The STs induced the regeneration of α-Ti and β-Ti phases, as thin alternate lamellae/plate-like structures, showing preferred spatial orientation. Also, the STs induced the formation of α′-Ti/α″-Ti martensite phases within parent α-Ti/β-Ti phases. The ageing treatment (A) induces reversion of α′-Ti/α″-Ti martensite phases in parent α-Ti/β-Ti phases. Mechanical behaviour showed that both strength and ductility properties are influenced, also, by applied TM processing route, optimum properties being obtained for a ST temperature of 900 °C followed by ageing (ST2 + A state), when both strength and ductility properties are at their maximum (σUTS = 1279 ± 15 MPa, σ0.2 = 1161 ± 14 MPa, εf = 10.1 ± 1.3%).

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, above β-transus, Ti-6246 Alloy

Alluaibi

Cojocaru

Rusea³

et al. 2020

Metals

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“…Good biomedical materials for orthopedic implants with long-term service need a combination of a low Young's modulus, close proximity to the human bone, and high strength to avoid the known "stress shielding effect" [1][2][3][4][5]. Among many investigated biocompatible materials, non-cytotoxic β-Ti alloys have been developed in recent decades [6][7][8][9][10][11][12][13], as these alloys have the most attractive combination of a low Young's modulus, high mechanical strength, and high ductility. This property combination can also ensure good processability (i.e., plastic deformation, machinability, welding, etc.)…”

Section: Introductionmentioning

confidence: 99%

Improving the Mechanical Properties of a β-type Ti-Nb-Zr-Fe-O Alloy

Cojocaru

Nocivin

Trisca-Rusu

et al. 2020

Metals

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The influence of complex thermo-mechanical processing (TMP) on the mechanical properties of a Ti-Nb-Zr-Fe-O bio-alloy was investigated in this study. The proposed TMP program involves a schema featuring a series of severe plastic deformation (SPD) and solution treatment (STs). The purpose of this study was to find the proper parameter combination for the applied TMP and thus enhance the mechanical strength and diminish the Young’s modulus. The proposed chemical composition of the studied β-type Ti-alloy was conceived from already-appreciated Ti-Nb-Ta-Zr alloys with high β-stability by replacing the expensive Ta with more accessible Fe and O. These chemical additions are expected to better enhance β-stability and thus avoid the generation of ω, α’, and α” during complex TMP, as well as allow for the processing of a single bcc β-phase with significant grain diminution, increased mechanical strength, and a low elasticity value/Young’s modulus. The proposed TMP program considers two research directions of TMP experiments. For comparisons using structural and mechanical perspectives, the two categories of the experimental samples were analyzed using SEM microscopy and a series of tensile tests. The comparison also included some already published results for similar alloys. The analysis revealed the advantages and disadvantages for all compared categories, with the conclusions highlighting that the studied alloys are suitable for expanding the database of possible β-Ti bio-alloys that could be used depending on the specific requirements of different biomedical implant applications.

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“…In some cases, the orientation of the mechanical properties is undesirable and must be controlled [13]. One of the ways to reduce the value of Rm and control the anisotropy phenomena is recrystallization and annealing heat treatment [17,18]…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Strain Routes on Mechanical Properties and Microstructure of Copper

Hoseini¹,

Ghayour²,

Golazani³

et al. 2021

Acta Metall Slovaca

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In the current paper, the role of change in strain routes was investigated, along with the cold rolling of copper metal. Four different strain routes including, (a) unidirectional rolling, (b) reverse rolling, (C) two-stage cross-rolling, and (d) multi-stage cross-rolling, were utilized to investigate the effect of strain routes change on microstructure, texture evolution, and anisotropy. Tensile strength in the unidirectional rolling sample compared to the cross-rolling sample decreased in the direction of initial rolling from 364 Mpa to 340 Mpa, in the direction of 45˚ to the initial rolling from 359 Mpa to 347 Mpa, and in the direction of perpendicular to the initial rolling from 371 Mpa to 360 Mpa. Texture intensity also decreased from 1413 in the unidirectional rolling sample to 992 in the cross-rolled sample. The results demonstrated that by rolling in different routes, the cross-rolling has led to a more homogeneous microstructure, less anisotropy, and weaker texture.

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Effect of cold rolling process on microstructure and mechanical properties of high strength β titanium alloy thin sheets

Cited by 19 publications

References 22 publications

Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, above β-transus, Ti-6246 Alloy

Microstructure and Mechanical Properties Evolution during Solution and Ageing Treatment for a Hot Deformed, above β-transus, Ti-6246 Alloy

Improving the Mechanical Properties of a β-type Ti-Nb-Zr-Fe-O Alloy

Effect of Different Strain Routes on Mechanical Properties and Microstructure of Copper

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