Effect of Heat Treatment on Microstructure and Mechanical Behavior of Ultrafine-Grained Ti-2Fe-0.1B

Mi, Yaoyao; Wang, Yanhuai; Wang, Yu; Dong, Yuecheng; Chang, Hui; Alexandrov, Igor

doi:10.3390/ma16082955

Cited by 7 publications

(3 citation statements)

References 49 publications

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“…Then, the 1#-4# Ti-1023 samples were subjected to homogenization HT at different temperatures of 1050 °C, 1100 °C, 1150 °C and 1200 °C for 12 h, respectively. During the homogenization HT process, Fe atoms are capable of diffusing against the concentration gradient, reducing the chemical segregation to a certain extent [34,35]. The results show that after homogenization HT at 1050 °C for 12 h, the Fe content deviations in the Ti-1023 ingot are 5.7%, 12.8% and 5.6%, respectively, which are not significantly lower than before HT.…”

Section: Effect Of Homogenization Ht On the Distribution Of Fe Conten...mentioning

confidence: 84%

Effects of Homogenization Heat Treatment on the Fe Micro-Segregation in Ti-1023 Titanium Alloy

et al. 2023

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The segregation of the Fe element in Ti-10V-2Fe-3Al titanium alloy (Ti-1023) can lead to the generation of beta flecks, which seriously affects the performance of Ti-1023 products. During the heat treatment (HT) process at a high temperature, the Fe element in Ti-1023 ingots will migrate, making its distribution more uniform and reducing the segregation index. In this paper, the control of Fe micro-segregation in Ti-1023 ingots by homogenization HT was investigated. Firstly, dissection sampling and SEM-EDS analysis methods were used to study the distribution pattern of the Fe element in the equiaxed grains in the core of Ti-1023 ingots. It was found that the Fe content in the grain gradually increased along with the radial direction from the core to the grain boundary. Then, the homogenization HT experiments and numerical simulations of Ti-1023 at different HT temperatures from 1050 °C to 1200 °C were carried out. The results showed that the uniformity of Fe element distribution within grain can be significantly improved by the homogenization HT. With increasing HT temperature, Fe atoms migration ability increases, and the uniformity of Fe element distribution improves. Homogenization HT at 1150 °C and 1200 °C for 12 h can effectively reduce the degree of Fe element segregation.

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Section: Effect Of Homogenization Ht On the Distribution Of Fe Conten...mentioning

confidence: 84%

Effects of Homogenization Heat Treatment on the Fe Micro-Segregation in Ti-1023 Titanium Alloy

et al. 2023

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“…For optimizing the comprehensive mechanical properties and good processability, a novel low cost Ti-Fe-B alloy was designed and developed by our group which was found to have a good combination of strength and ductility in previous studies [12,13] as well as low flow strength at high temperature deformation [14,15]. Additionally, a good thermal stability and corrosion behavior of an ultrafine-grained Ti-2Fe-0.1B titanium alloy have also been revealed in further investigations [13,16], but the fatigue properties of this alloy have not been studied systematically. As a key load-bearing structure material, titanium alloy components are often subjected to cyclic loading, which is a great test and may lead to fatigue cracks and fractures in a short period of time and eventually cause accidents.…”

Section: Introductionmentioning

confidence: 92%

Low-Cycle Fatigue Behavior and Fracture Characteristics of Low-Cost Ti-2Fe-0.1B Alloy

Wang

Sun

et al. 2023

Metals

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In recent decades, the effect of Fe element addition on titanium alloy has been investigated extensively due to the development of low-cost titanium alloys, as well as B microalloying, which could decrease the grain size of titanium alloys during the casting process. As a key structural material, the study of the fatigue behavior of titanium alloys is crucial and always attractive for scientists. Hence, in this paper, the low cycle fatigue (LCF) behavior and fracture characteristics of a low-cost Ti-2Fe-0.1B alloy with a lamellar structure were investigated systematically, five different strain amplitudes (Δεt/2) in the range from 0.6% to 1.4% were selected to control the LCF process. It was found that the Ti-2Fe-0.1B alloy exhibits continuous cyclic softening behavior in the cycle as a whole at Δεt/2 ≤ 1.2%, while at Δεt/2 = 1.4%, it exhibits slight cyclic hardening at the initial stage of the cycle, then shows cyclic softening. Compared with pure titanium and other typical titanium alloys, the Ti-2Fe-0.1B alloy indicated maximum fatigue life under the same strain amplitude, it can be attributed to the fine grain size result from the effect of Fe element and trace B, which could hinder the dislocation movement and crack propagation.

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“…Our group designed and developed a low-cost Ti-2Fe-0.1B alloy, which has good mechanical properties, corrosion resistance, and thermal stability [ 25 , 26 ], considering that the alloying elements Fe and B could benefit from the superplasticity of the alloy based on the above mentioned. Therefore, it is interesting to study the high-temperature deformation behavior of the Ti-2Fe-0.1B alloy and explore the mechanism of superplasticity.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Superplastic Deformation Behavior of Low-Cost Ti-2Fe-0.1B Alloys

Mi,

Lu,

Wang

et al. 2024

Materials

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Titanium alloys have high specific strength and corrosion resistance, which have promising applications in industry. However, the machinability of titanium alloys is limited due to their crystal lattice and physical properties. Thus, in recent years, the superplastic forming of titanium alloys has been intensively developing, in particular, forming at low temperatures and/or high strain rates. In this work, a tensile test of low-cost Ti-2Fe-0.1B alloys was carried out at a temperature of 550~750 °C and a strain rate of 1 × 10−3 s−1~1 × 10−2 s−1. The results showed that the alloy exhibited good superplasticity even at a high strain rate (1 × 10−2 s−1) and a low deformation temperature of 550 °C; the elongation of the alloy in this state reached 137.5%. The high strain rate sensitivity coefficient m (0.3) and the maximum elongation (452%) were obtained at a strain rate of 1 × 10−3 s−1 and a temperature of 750 °C. Characteristics of the microstructure showed that during superplastic deformation, the recrystallization and grain boundary sliding of the alloy phases were accelerated, which could be ascribed to the effect of the element Fe. At the same time, the TiB phase located around the primary elongated α grains could also induce dynamic recrystallization and dynamic globularization during deformation.

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Effect of Heat Treatment on Microstructure and Mechanical Behavior of Ultrafine-Grained Ti-2Fe-0.1B

Cited by 7 publications

References 49 publications

Effects of Homogenization Heat Treatment on the Fe Micro-Segregation in Ti-1023 Titanium Alloy

Effects of Homogenization Heat Treatment on the Fe Micro-Segregation in Ti-1023 Titanium Alloy

Low-Cycle Fatigue Behavior and Fracture Characteristics of Low-Cost Ti-2Fe-0.1B Alloy

A Study of the Superplastic Deformation Behavior of Low-Cost Ti-2Fe-0.1B Alloys

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