Microstructure evolution and static recrystallization during hot rolling and annealing of an equiaxed-structure TC21 titanium alloy

Wang, Ke; Wu, Mingyu; Yan, Zhibing; Li, Dongrong; Xin, Renlong; Qing, Liu

doi:10.1016/j.jallcom.2018.04.148

Cited by 90 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A lot of tiny secondary α phase (α s ) precipitates in β matrix, Figure 2, which can be attributed to the promoting effect of distortion en-ergy in β phase on the precipitation of α s [26]. Compared with the as-received microstructure, Figure 1, many equiaxed α grains are elongated along the TD direction after rolling, which is similar to the results of previous experiments [27,28]. In addition, the α grain size distribution is nearly uniform and the α grain boundaries are smooth with limited penetration of the β phase into the elongated α grains, which suggests that a little dynamic recrystallization and globularization occurs during rolling.…”

Section: Rolled Microstructuresupporting

confidence: 85%

“…The recrystallized fraction of β phase rapidly increases from 82 % at 1 h to 96 % at 2 h. This phenomenon indicates that the static recrystallization occurs more easily and sufficiently in β phase than α phase. It is because that the soft β phase accommodates more deformation than hard α phase, which generates more strain energy in β phase and further promotes the static recrystallization [27].…”

Section: Grain Morphology Evolution During Annealingmentioning

confidence: 99%

See 1 more Smart Citation

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Xin

Wang

Yan

et al. 2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

A homogeneous equiaxed‐structure TC21 titanium alloy is hot rolled and annealed for different time ranging from 1 h to 6 h. The grain morphology and texture evolution of α and β phases during annealing are mainly investigated using the electron back‐scattered diffraction characterization. In the early annealing stage, the α grain mainly maintains the elongated morphology generated in the rolling. With increasing annealing time, more and more elongated α grains become equiaxed due to enhanced static recrystallization and boundary splitting. Differently, the β grain exhibits a fully equiaxed morphology all the time due to the sufficient static recrystallization, and get a coarsening with increasing annealing time. The α phase exhibits a (0001) basal texture in the early annealing stage, and then forms a TD‐split texture with increasing annealing time. The β phase exhibits the {001}<110> texture at every annealing time. Based on the analysis about the texture of different grain sizes, the effects of recrystallization nucleation and oriented growth on texture evolution are discussed. It suggests that TD‐split texture in α phase is originated from both the recrystallization nucleation and oriented growth. The formation of {001}<110> texture in β phase is mainly originated from the oriented growth.

show abstract

Section: Rolled Microstructuresupporting

confidence: 85%

Section: Grain Morphology Evolution During Annealingmentioning

confidence: 99%

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Xin

Wang

Yan

et al. 2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…In general, the UDR sample has more stored energy and hence high driving force for recrystallization, which leads to higher fraction of recrystallized grain [22]. However, there is an abnormally high extent recrystallization in the CR-600 sample with the fraction of recrystallized grains in 65.36%, which is contrary to previous research on other alloys [33]. The reason may be attributed to dynamic recrystallization (DRX) during hot rolling process.…”

Section: Microstructure Characterization Of Ti65 Alloy Sheetsmentioning

confidence: 68%

Microstructure and Texture Variations in High Temperature Titanium Alloy Ti65 Sheets with Different Rolling Modes and Heat Treatments

et al. 2020

View full text Add to dashboard Cite

Ti65 alloy (Ti-5.8Al-4.0Sn-3.5Zr-0.5Mo-0.4Si-0.3Nb-1.0Ta-0.8W-0.05C) is the newly developed high temperature titanium alloy optimized from Ti60 alloys. The long-term service temperature of the alloy is as high as 650 °C, which is unattainable with the previous high temperature titanium alloy. It has excellent strength and excellent creep resistance, and has great application prospects in the aerospace industry. In the current study, the evolution of microstructure and texture of Ti65 alloy sheets developed by unidirectional rolling (UDR) and cross rolling (CR) followed by solution and aging treatment was investigated. The microstructure of the UDR sample consists of equiaxed α p , lamellar α s and few elongated α p , and the texture is the combination of minor B-type and major T-type texture, with the main component of basal {0001} fiber texture and { 01 1 ¯ 0 } < 2 1 ¯ 1 ¯ 0 > , respectively. Due to more active slip system resulted by transformed direction, the microstructure of the CR sample consists of more elongated α p , and the { 01 1 ¯ 0 } <0001> texture characterized as R-type texture forms in addition to B/T-type texture. With aging temperature increasing, the microstructures for both transform to duplex microstructure, and the thicknesses of lamellar α s increase. B-type texture becomes stronger, while T/R-type texture are weakened, which is caused by the combination of recrystallization, spheroidization, and variant selection. An abnormal increasing of T/R-type texture but constant B-type texture happens in the CR-600 sample, which is related to high recrystallization fraction. It is expected that the research results can provide useful references for the rolling of high temperature titanium alloy sheets and the precise control of microstructure/texture.

show abstract

“…After 960 °C/1 h with WQ and 500 °C/4 h with AC, a basket structure with finer recrystallized grains could be obtained, which improved the comprehensive mechanical properties. Wang [ 10 ] studied that TC21 titanium alloy is mainly composed of equiaxed grains and residual phases, and 880 °C is the appropriate annealing temperature for uniform microstructure refinement of hot-rolled TC21 titanium alloy. Hou [ 11 ] studied the effects of solution cooling rate and aging temperature on the structure of TC21 alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Third-Stage Heat Treatments on Microstructure and Properties of Dual-Phase Titanium Alloy

Mao

Chen

et al. 2021

Materials

View full text Add to dashboard Cite

Two-phase TC21 titanium alloy samples were solution-treated at 990 °C (β phase zone) and cooled by furnace cooling (FC), air cooling (AC), and water quenching (WQ), respectively. The second solution stage treatment was carried out at 900 °C (α + β phase zone), then aging treatment was performed at 590 °C. The influence of the size and quantity of the α phase on the properties of the sample were studied. The experimental results showed as the cooling rate increased after the first solution stage treatment, wherein the thickness of primary layer α gradually decreased, and the tensile strength and yield strength gradually increased. After the second solution stage treatment, the tensile properties of samples increased due to the quantity of layers α increased. The aging treatment promoted the precipitation of the dispersed α phase and further improved the tensile strength. After the third solution stage treatments, the FC samples with more β-phase had the best comprehensive mechanical properties.

show abstract

Microstructure evolution and static recrystallization during hot rolling and annealing of an equiaxed-structure TC21 titanium alloy

Cited by 90 publications

References 28 publications

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Grain morphology and texture evolution of TC21 titanium alloy during annealing with different time

Microstructure and Texture Variations in High Temperature Titanium Alloy Ti65 Sheets with Different Rolling Modes and Heat Treatments

Effect of Third-Stage Heat Treatments on Microstructure and Properties of Dual-Phase Titanium Alloy

Contact Info

Product

Resources

About