Effect of microstructure on tensile properties, impact toughness and fracture toughness of TC21 alloy

Wen, Xin; Wan, Mingpan; Huang, Chaowen; Tan, Yuanbiao; Lei, Min; Liang, Yilong; Cai, Xin

doi:10.1016/j.matdes.2019.107898

Cited by 96 publications

(21 citation statements)

References 31 publications

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“…In the range of 540~630 • C, the impact toughness increased about 2 J/cm 2 every 30 • C via data fitting. This result agreed with Wen's study [5], the impact toughness of TC21 alloy increases with the increase of the annealing temperature in the two-phase region. Also, the slopes of the equations in impact toughness (a ku ) is 37.04, indicating that the thickness of lamellar α is the effective microstructural control unit of the toughness for Ti17 alloy the micro change of size will have a great effect on the impact toughness, which may also be closely related to the distribution and content of lamellar α. impact toughness, as shown in Figure 10.…”

Section: Analysis Of Impact Toughness On Ti17 Alloysupporting

confidence: 93%

“…Figure 9 showed the impact toughness (aku) of Ti17 alloy after heat deformation and different aging temperature treatments. Obviously, with the increase of aging temperature, the impact toughness (aku) demonstrated an increasing trend, which is opposite to the tensile strength, implying that tensile properties and toughness possess a trade-off relationship [5,33,34]. The opposite trends in tensile strength and impact toughness not only indicate that the impact toughness of the alloy is sensitive to aging temperature also that the microstructure control unit is different.…”

Section: Analysis Of Impact Toughness On Ti17 Alloymentioning

confidence: 97%

“…For the titanium alloy, its microstructure mainly depends on the processing technology and heat treatment system. Different forming processes and heat treatment system would result in considerable discrepancies in proportion, size and morphology of α and β phase finally, cause discrepancies in the mechanical properties [5,6]. Therefore, the mechanical properties of the alloy could be improved by process parameters.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment

Yan

Zhao

Liu

et al. 2020

Metals

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In this paper, the relationships between the thermomechanical treatments (TMT), the microstructural evolution the mechanical properties of Ti17 alloy were investigated. The results indicate the coarsening behavior of lamellar α was sensitive to the aging temperature during the process of TMT. The thickness of lamellar α changed from 0.19 to 0.38 μm with an increase in the aging temperature. Moreover, both tensile properties and impact toughness vary with the thickness of lamellar α. The tensile strength increases with the increase of the thickness of lamellar α the plasticity and impact toughness the opposite trend. The quantitative investigations found that there is a linear relationship between the tensile properties and the thickness of lamellar α the tensile properties could be adjusted in the range of 1191~1062 MPa and 1163~1039 MPa to obtain ultimate tensile strength and yield strength as well as 11~16% elongation and 23~33% reduction of area by varying the thickness of lamellar α. Meanwhile, the impact toughness could be adjusted in the range of 46 ~53 J/cm2. The high correlation coefficients imply that the linear equation is reliable to describe the relationships between the mechanical properties and the thickness of lamellar α for Ti17 alloy.

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Section: Analysis Of Impact Toughness On Ti17 Alloysupporting

confidence: 93%

Section: Analysis Of Impact Toughness On Ti17 Alloymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment

Yan

Zhao

Liu

et al. 2020

Metals

Self Cite

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“…TC21 titanium alloy is a high strength and high toughness titanium alloy developed on the basis of Ti-62222 alloy in the United States. It has a nominal composition of Ti-6Al-3Mo-2Nb-2Sn-2Zr-1Cr-0.1Si, strength of about 1100 MPa, elongation of about 8%, and fracture toughness of about 70 MPa·m 1/2 [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Design of high strength titanium alloy through finding a critical composition with ultra-fine α phase

Zhang

Zhou

Wang

et al. 2020

Mater. Res. Express

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This study presents the design of a high strength titanium alloy based on the idea that the β titanium alloy with critically stable composition could precipitate ultra-fine α phase. An efficient method was used to find the composition of TC21-xV alloy in which ultra-fine α phase could be obtained. It is found that TC21-5V alloy containing ultra-fine α phase and possessing highest hardness could be obtained after solution treatment in the β single-phase region and subsequent aging. The morphology of primary and secondary α phases can be controlled by changing the solution treatment and aging temperatures. Calculation results of driving force and growth rate of secondary α phase show that the growth rate may be a decisive factor for the final size of secondary α phase after solution and aging treatments in the two-phase region. Finally, when the alloy was solution treated at 820°C and aged at 500°C, the highest strength of 1540 MPa was obtained. The alloy was solution treated at 820°C and aged at 600°C exhibited high strength of 1210 MPa with 11.4% elongation.

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“…Titanium and its alloys are used extensively in the fields of aerospace, energy, and medical industries because of their excellent properties, such as a low density, high specific strength, good corrosion resistance, and good biocompatibility [1]. Nowadays, the damage-tolerant design principle has become dominant in structural component manufacture for aerospace applications [2], which leads to a stricter requirement for mechanical properties of titanium alloys. The optimization of process parameters that dominate final microstructures is crucial to improve the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy

Dong

Cai

et al. 2020

Mater. Res. Express

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Grain-growth behaviors of TC4-DT alloy in a narrow temperature range (990°C−1050°C) were systematically investigated, and the effects of which on the lamellar structural evolution and mechanical properties were quantitatively evaluated. Microstructural observations indicated that prior β grain size increased with an increase in heat-treatment temperature and time, which was described by the modified Sellars model. The grain-growth exponent (n=2.741) and activation energy (Q=161.0 kJ mol −1 ) during β treatment were confirmed. The α colony size similar to β grain varied significantly with the heat-treatment conditions, while α plate thickness changed slightly. The Hall-Petch equation could qualitatively exhibit the relationships between the lamellar microstructure parameters (prior β grain size, α colony size, and α plate thickness) and mechanical properties (strength, ductility, and impact toughness). The fine prior β grain that contained different orientated α colonies produced more boundaries to hinder dislocation motion and crack propagation, which contributed a more circuitous crack growth path. The results indicated that the control of α colony size was critical to improve the mechanical performance of TC4-DT alloy.

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Effect of microstructure on tensile properties, impact toughness and fracture toughness of TC21 alloy

Cited by 96 publications

References 31 publications

Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment

Quantitative Relationships between Mechanical Properties and Microstructure of Ti17 Alloy after Thermomechanical Treatment

Design of high strength titanium alloy through finding a critical composition with ultra-fine α phase

Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy

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