Microstructure evolution and phase transformation kinetics of low cost Ti-35421 titanium alloy during continuous heating

Ding, Can; Li, Xin; Zhu, Hongyu; Chen, Fuwen; Li, Feng; Chang, Hui

doi:10.1016/j.jmrt.2021.06.071

Cited by 20 publications

(5 citation statements)

References 56 publications

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“…6 and 7). The observation that cracks end near the martensitic zone in the HAZ strongly suggests that crack initiation has occurred as a consequence of a volume expansion associated with the β→α transition [19][20][21][22]. 2 The development of the HAZ can be discussed as follows.…”

Section: Discussionmentioning

confidence: 99%

Impact of Laser Marking on Microstructure and Fatigue Life of Medical Grade Titanium

et al. 2023

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Section: Discussionmentioning

confidence: 99%

Impact of Laser Marking on Microstructure and Fatigue Life of Medical Grade Titanium

et al. 2023

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“…Ti-407 material was supplied in the form of a seamless rolled ring processed with a combination of temperatures above and below the β transus (T βt ), that is, in the β-phase field and in the (α + β) temperature region, respectively. T βt was determined by nonisothermal dilatometry, as this technique is an effective method for studying the phase transformation process [25,26] since the expansion curve and its first derivative can indicate the onset, development, and completion of the phase transformation [27]. The thermal dilatometry test was performed using a Linseis model L75 vertical dilatometer at a constant heating rate of 5 • C/min from room temperature to 900 • C. The thermal expansion of a cylindrical sample measuring 10 mm in diameter and 30 mm in length was plotted as a function of temperature, and its first derivative with respect to time was obtained to indicate the rate of expansion.…”

Section: Methodsmentioning

confidence: 99%

Effect of Initial Microstructure on the Temperature Dependence of the Flow Stress and Deformation Microstructure under Uniaxial Compression of Ti-407

Barboza,

López,

Guajardo

et al. 2024

Metals

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In this study, the influence of initial microstructure and deformation temperature on the flow stress behavior and microstructural evolution of TIMETAL®407 (Ti-407) alloy are investigated. For this purpose, compression cylinders were β-annealed at 940 °C and then cooled to room temperature using furnace cooling, static air, and water quenching to promote three initial microstructures with different α lath thicknesses. The annealed cylinders were compressed isothermally in the range of 750 °C to 910 °C at a constant crosshead speed of 0.05 mm/s up to an engineering strain of −0.8. The resulting stress–strain curves are discussed in terms of the morphology and distribution of the α and β phases. It was found that flow stress is inversely proportional to deformation temperature for all initial microstructures. At the lowest temperatures, compressive yield strength was higher in water-quenched and air-cooled samples than in furnace-cooled specimens, suggesting that the acicular α-phase morphology obtained by rapid cooling could enhance mechanical strength by hindering dislocation motion. Two high-temperature flow regimes were determined based on the shape of the flow stress curves, indicating microstructural changes occurring during deformation. At higher temperatures, the effect of the initial microstructure is negligible as the primary α phase is transformed to the β phase at around 850 °C irrespective of the initial α-lath thickness.

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“…energy barrier that needs to jump in the phase transition process is called phase transition activation energy, which can well reflect the difficulty of phase transition. Therefore, the phase transition activation energy is an important thermodynamic parameter for evaluating the β→α phase transition [30]. The phase transition activation energy changes with the α phase transition mechanism, so the transition temperature of Ti6Al4V-0.55Fe alloy at different rates can be calculated by Kissinger-Akahira-Sunose (KAS) method [31][32][33].…”

Section: Activation Energy Of the β→α Phase Transformationmentioning

confidence: 99%

Phase transformation behaviours and mechanical properties of Ti6Al4V-0.55Fe alloy during continuous cooling

Zhu

Liu

et al. 2022

Materials Science and Technology

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The phase transformation and mechanical properties of Ti6Al4V-0.55Fe alloy were investigated during the continuous cooling process. The curves of α phase precipitation exhibit a typical S-shaped pattern, which indicated that β→α phase transformation is a nucleation-growth-controlled process. The average activation energy is 231 kJ mol−1 calculated by Kissinger–Akahira–Sunose method. The Avrami exponent during β→α transformation significantly changes with the increasing transformed volume fraction. It is found that the thickness of α phase lamellar decreased, while the strength and hardness increased with the increasing cooling rate. Moreover, the fracture morphology of the samples gradually changes from ductile fracture to brittle fracture under the cooling rate from 1 to 15 K min−1, which illuminates that the plasticity of the alloy will decrease.

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Microstructure evolution and phase transformation kinetics of low cost Ti-35421 titanium alloy during continuous heating

Cited by 20 publications

References 56 publications

Impact of Laser Marking on Microstructure and Fatigue Life of Medical Grade Titanium

Impact of Laser Marking on Microstructure and Fatigue Life of Medical Grade Titanium

Effect of Initial Microstructure on the Temperature Dependence of the Flow Stress and Deformation Microstructure under Uniaxial Compression of Ti-407

Phase transformation behaviours and mechanical properties of Ti6Al4V-0.55Fe alloy during continuous cooling

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