The titanium structure after a thermoplastic compression at elevated temperatures

Bańczerowski, Jakub; Jeleńkowski, J.; Płociński, Tomasz; Skalski, Konstanty

doi:10.1080/02670836.2019.1661648

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…The most desirable changes were noted for the deformation performed at 400 °C, with strain rates 0.1/s and 1/s. As indicated in previous report [5], very desirable grain reduction was also achieved at 600 °C, so we can safely assume that temperature 500 °C is also viable for this process. The DRX was noted for the deformation at 400 °C and 10/s strain rate, causing grain growth.…”

Section: Discussionsupporting

confidence: 66%

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Thermoplastic compression is a technique of pure titanium microstructure enhancement for biomedical applications

Bańczerowski,

Pawlikowski,

Płociński

et al. 2023

Preprint

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Pure titanium due to its high corrosion resistance, low stiffness and good mechanical properties is commonly used in medicine for orthopaedic applications. However, its material properties can be further enhanced to better fulfil the role of the biocompatible material. The thermoplastic deformation in heightened temperature is proposed as a method for microstructure improvement. Titanium samples were compressed in different temperatures and strain rates in order to determine the best conditions for grain fragmentation – the main factor responsible for strength and hardness increase. The thermoplastic stress-strain curves were registered. Then microstructure observations and electron backscatter analysis were performed on the chosen samples. Finally, mechanical response of the previously deformed material was obtained in room temperature compression tests. A significant grain fragmentation was recorded for the material deformed in 400 °C, at 0.1/s and 1/s strain rates. Desirable results were also noticed for the deformation performed at 500-600 °C. However, high temperatures (700-800 °C) and strain rates (10/s) resulted in dynamic recrystallization, causing undesirable grain growth. An increase in hardness was observed in all cases, with higher values recorded in lower deformation temperatures. Room temperature compression tests revealed slight increase of ductility.

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Section: Discussionsupporting

confidence: 66%

“…Therefore, the material strengthening is paramount. Previous research [5] indicates that one of the best ways to strengthen the material is by its grain size reduction (according to Hall-Petch theorem) [6]- [8].…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic compression is a technique of pure titanium microstructure enhancement for biomedical applications

Bańczerowski,

Pawlikowski,

Płociński

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…In our previous work, Arrhenius equation was chosen as the potentially most promising. However, our experimental and analytical studies showed that this equation was accurate in the case of the pure titanium only in certain circumstances [20,21]. Therefore, other models were taken into consideration.…”

Section: Introductionmentioning

confidence: 94%

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

Bańczerowski

Pawlikowski

2021

Continuum Mech. Thermodyn.

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The pure titanium, as a biomaterial destined for production of load-demanding prostheses, requires thermo-mechanical processing to increase its strength. The most common way to achieve this is the method of grain fragmentation. Thermo-mechanical deformation of titanium is a complex process, which makes it very difficult to describe it by means of constitutive equations. Such constitutive relations are very useful as they can be implemented in the finite element method tools in order to simulate and optimize the whole process. Cylindrical specimens were compressed at elevated temperatures on a thermo-mechanical simulator. The tests were performed at four different strain rates (from 10$$^{\mathrm {-2}}$$ - 2 s$$^{\mathrm {-1}}$$ - 1 to 10 s$$^{\mathrm {-1}})$$ - 1 ) and at 775 K and 875 K temperatures. The collected data allowed us to create strain–stress graphs characterizing the process. Observations on the scanning electron microscope and scanning transmission electron microscope were done as well as the electron backscatter diffraction analysis, revealing significant grain fragmentation. The aim of the studies described in the paper was to verify and select a proper mathematical model for the process of titanium grain fragmentation obtained in a thermoplastic process. Four different constitutive models were considered. The calculation of theoretical stress values based on the Arrhenius-type equation, Anand viscoplastic model, Johnson–Cook model and Khan Huang-Liang model was done and compared to experimental results. The theoretical curves were generated and fitted to experimental, which made it possible to calibrate the constants in the mathematical models. The curve-fitting analyses showed that the Anand constitutive model described the titanium behaviour best.

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New approach to $${\upalpha }$$-titanium mechanical properties enhancement by means of thermoplastic deformation in mid-temperature range

Bańczerowski,

Pawlikowski,

Płociński

et al. 2024

Continuum Mech. Thermodyn.

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Pure titanium due to its high corrosion resistance, low stiffness and good mechanical properties is commonly used in medicine for orthopaedic applications. However, its material properties (especially in the case of $${\upalpha }$$ α -titanium) require a further enhancement to fulfil its role. The thermoplastic deformation in mid-temperature is proposed as a method for microstructure improvement. Titanium samples were compressed in different temperatures and strain rates to determine the best conditions for grain fragmentation—the main factor responsible for strength and hardness increase. The thermoplastic stress–strain curves were registered. Then microstructure observations and electron backscatter analysis were performed on the chosen samples. Finally, mechanical response of the previously deformed material was obtained in room temperature compression tests. A significant grain fragmentation was recorded for the material deformed in 400 $$^{\circ }\hbox {C}$$ ∘ C , at 0.1/s and 1/s strain rates. Desirable results were also noticed for the deformation performed at 500–600 $$^{\circ }\hbox {C}$$ ∘ C . However, high temperatures (700–800 $$^{\circ }\hbox {C}$$ ∘ C ) and strain rates (10/s) resulted in dynamic recrystallization, causing undesirable grain growth. An increase in hardness was observed in all cases, with higher values recorded in lower deformation temperatures. Room temperature compression tests revealed slight increase of ductility.

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The titanium structure after a thermoplastic compression at elevated temperatures

Cited by 3 publications

References 30 publications

Thermoplastic compression is a technique of pure titanium microstructure enhancement for biomedical applications

Thermoplastic compression is a technique of pure titanium microstructure enhancement for biomedical applications

New approach in constitutive modelling of commercially pure titanium thermo-mechanical processing

New approach to $${\upalpha }$$-titanium mechanical properties enhancement by means of thermoplastic deformation in mid-temperature range

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