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

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2776
Author(s):  
Xiqin Mao ◽  
Meigui Ou ◽  
Desong Chen ◽  
Ming Yang ◽  
Wei Long
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Aging Treatment ◽  
Air Cooling ◽  
Phase Zone ◽  
Two Phase ◽  
Β Phase ◽  
Solution Treated ◽  
Α Phase ◽  
Third Stage

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.

Effect of Heat Treatment on the Microstructure and Dynamic Behavior of Ti-10V-2Fe-3Al Alloy

2018 ◽  
Vol 910 ◽  
pp. 155-160 ◽  
Author(s):  
An Jin Liu ◽  
Lin Wang ◽  
Hua Xiang Dai
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
Yield Strength ◽  
Dynamic Compression ◽  
Aging Treatment ◽  
Solution Temperature ◽  
Β Phase ◽  
Solution Treated ◽  
Α Phase

Microstructure evolution and compression property of Ti-10V-2Fe-3Al titanium alloy were studied in this paper. Solution treatments were performed at temperature ranging from 710°C to 830°C and some followed by aging treatment. Ti-10V-2Fe-3Al alloys with α+β phase show higher mechanical properties compared with single β phase alloy. With the increase of solution temperature, the content of equiaxed α phase decrease. Consequently, the strength of the alloy increases while the plasticity drops down. The highest yield strength value of 1668 MPa was obtained in the sample treated by 770°C solution treated for 2 hours then water quenched and followed by 520°C aging for 8 hours then air cooled. The stress induced martensite α'' phase appeared after SHPB dynamic compression in the sample solution treated at 830°C.

Effect of Heat Treatment on the Microstructure Evolution of Ti-6Al-3Sn-3Zr-3Mo-3Nb-1W-0.2Si Titanium Alloy

2016 ◽  
Vol 879 ◽  
pp. 1828-1833 ◽  
Author(s):  
Xiao Yun Song ◽  
Wen Jing Zhang ◽  
Teng Ma ◽  
Wen Jun Ye ◽  
Song Xiao Hui
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Microstructure Evolution ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Water Quenching ◽  
Air Cooling ◽  
Two Phase ◽  
Β Phase ◽  
Α Phase

Ti-6Al-3Sn-3Zr-3Mo-3Nb-1W-0.2Si (BTi-6431S) alloy is a novel two-phase high temperature titanium alloy for short-term using in aerospace industry up to 700°C. The effects of heat treatment on the microstructure evolution of BTi-6431S alloy bar were investigated through optical microscopy (OM), X-ray diffraction (XRD), electron probe microanalysis (EPMA) and transmission electron microscopy (TEM). The results show that solution treatment in β region at 1010°C followed by water quenching results in the formation of orthorhombic martensite α′′ phase, while air cooling leads to the formation of hexagonal martensite α′ phase. When solution-treated in α+β phase field at temperatures from 900°C to 980°C following by water quenching, the content of primary α phase decreases with the increase of heat treatment temperature. For the alloy subjected to identical heat treatment, the content of Al in α phase is much higher than that in β phase, while the contents of Nb, Mo and W elements in α phase are much less than those in β phase.

Influence of Heat Treatment on Microstructure and Tensile Property of Ti-5Al-5Mo-5V-3Cr-1Fe Alloy

2013 ◽  
Vol 365-366 ◽  
pp. 1003-1006
Author(s):  
Yan Yan Fu ◽  
Song Xiao Hui ◽  
Wen Jun Ye ◽  
Xu Jun Mi
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Tensile Property ◽  
Aging Temperature ◽  
Aging Treatment ◽  
Minimum Level ◽  
Β Phase ◽  
Α Phase

The effect of solution and aging temperatures on microstructure and tensile property of Ti-5Al-5Mo-5V-3Cr-1Fe Alloy was investigated. The results showed that the tensile strength lowered, when the solution and aging temperature rose respectively. The alloy with different heat treatments showed better tensile strength totally, i.e. the minimum level of ultimate and yield strength passed 1280 MPa and 1245MPa. The highest ultimate tensile strength could reach 1445 MPa. After (α+β) solution and aging treatment, the microstructure consists of primary α phase and transformed β phase with fine secondary α phase precipitating to improve the tensile strength effectively.

Effects of Heat Treatment on Microstructures and Mechanical Properties of Ti-38644 Alloy for Aerospace Fasteners

2018 ◽  
Vol 913 ◽  
pp. 109-117 ◽  
Author(s):  
Qing Yun Zhao ◽  
Si Rui Cheng ◽  
Li Dong Wang ◽  
Li Min Dong ◽  
Feng Lei Liu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Tensile Strength ◽  
Solution Temperature ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Air Cooling ◽  
Β Phase ◽  
Α Phase

The effects of heat treatment on microstructure and mechanical properties of Ti-38644 alloy were investigated by scanning electron microscope (SEM) and transmission electron microscopy (TEM) as well as uniaxial tensile test. The results show that when the solution temperature is lower than 845°C, the microstructure of Ti-38644 alloy is equiaxed β phase with the grain size of 20μm, and the tensile strength is about 960MPa. As raising solution temperature to 860°C, the grain size of Ti-38644 alloy increases to 100μm and the tensile strength decreased to 870MPa. There are a large number of secondary α phase precipitated from the grain boundaries and within grain of β phase undergoing aging treatment. Secondary α phase coarsens with increasing the aging temperature, leading to the decrease of tensile strength. After solution treatment at 815°C for 1.5h, water quenching plus aging at 520°C for 10h, air cooling, Ti-38644 alloy shows a better mechanical property with the tensile strength 1330MPa, elongation and reduction of area 10% and 45% respectively.

Temperature Effect on Microstructure and Mechanical Behavior of Ti-15V-3Cr-3Al-3Sn

2011 ◽  
Vol 217-218 ◽  
pp. 1277-1282
Author(s):  
Rong Tan Huang ◽  
Wen Han Chen ◽  
Lv Wen Tsay
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Tensile Test ◽  
Mechanical Behavior ◽  
Temperature Effect ◽  
Aging Temperature ◽  
Aging Treatment ◽  
Α Phase ◽  
Environment Temperature ◽  
Notched Tensile Strength

Ti-15V-3Cr-3Al-3Sn, β-phase titanium alloy, is subjected to study the temperature effects on microstructure and mechanical behavior by using different aging temperature (426 ∼ 600 oC) and high temperature (450oC) notched tensile test. It follows that the highest hardness of Ti-15V-3Cr-3Al-3Sn would be got up to 420 Hv after 426 oC aging. Afterward, the hardness is decreasing with increasing aging temperature. By means of microstructure analyses, it reveals that the narrow and intragranular α-phase precipitates with lamella-shape in the grains at 426 oC aging treatment caused the age hardening of the titanium alloy. Subsequently, the α-phase precipitates were coarsening with increasing the aging temperature and showed the thick morphologies distributed along grain boundaries, which results in overaging. In the notched tensile test at 450oC, the highest notched tensile strength (1160 MPa) is also obtained after 426oC aging treatment, and then decreasing with increasing aging temperature. Its mechanical behavior is different from the room temperature notched tensile test, which demonstrates the lowest notched tensile strength (813 MPa) after 426 oC aging treatment due to the notched embrittlement effect. According to microstructure study, it suggests that the environment temperature effect enhanced the toughness of the alloy and terminated the notched embrittlement effect resulted from the 426oC aging treatment.

The Microstructure and Mechanical Properties of High-Strength and High-Toughness Titanium Alloy BTi-6554 Bar

2009 ◽  
Vol 618-619 ◽  
pp. 173-176 ◽  
Author(s):  
Wei Qi Wang ◽  
Yu Lan Yang ◽  
Yong Qiang Zhang ◽  
Feng Li Li ◽  
Hui Li Yang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Treatment Condition ◽  
Aging Treatment ◽  
High Strength ◽  
Plastic Property ◽  
Good Prospect ◽  
Phase Zone ◽  
High Toughness ◽  
Β Phase ◽  
New Type

This paper is concert about the mechanical property of high strength and high toughness titanium alloy BTi-6554 (Ti-6Cr-5Mo-5V-4Al) bars. The results show that: in β-phase zone solid solution + aging treatment condition, the strength and fracture toughness of the alloy at room temperature can reach a higher level while inα+β)-phase solution + aging treatment condition, the plastic property is relatively high. Compared with Ti-1023 and VT22 alloy bars produced by the similar processing procedure, the alloy shows improved properties combined in strength and toughness. BTi-6554 is a new type of titanium alloy with high structural efficiency, and has a good prospect for commercial and application.

The Influence of the Heating Method on the Microstructure Evolution of Thermal Deformed TA15 Titanium Alloy

2017 ◽  
Vol 732 ◽  
pp. 76-80
Author(s):  
Ping Li ◽  
Peng Peng Yao ◽  
Ke Min Xue ◽  
Guo Qiang Gan
Keyword(s):  
Titanium Alloy ◽  
Microstructure Evolution ◽  
Water Quenching ◽  
Conventional Heating ◽  
X Ray Diffraction ◽  
Phase Zone ◽  
Two Phase ◽  
Heating Method ◽  
Β Phase ◽  
Ta15 Titanium Alloy

X-ray diffraction and EBSD techniques were applied to investigate microstructure evolution and phase transition of thermal deformed TA15 titanium alloy under different heating methods(β phase zone heating and conventional heating). The results indicate that microstructures of thermal deformed TA15 titanium alloy after water quenching appear grain refinement undergoing these two kinds of heating methods. A large number of primary equiaxed α grains are retained after two phase zone deformation under conventional heating method. Meanwhile more regular arrangement and greater cluster of acicular plate martensite microstructure and clear original β grains are obtained through β phase deformation and water quenching. The diffraction peak of (200) crystal face of Al-rich α phase disappears under β phase zone heating method. The preferential orientation of TA15 titanium alloy after thermal deformation and water quenching is reduced obviously under β phase zone heating method.

scholarly journals Effects of Heat Treatment on Mechanical Properties and Microstructure Evolutions of Ti-5321 Alloy

2020 ◽  
Vol 321 ◽  
pp. 11032
Author(s):  
Jingzhe Niu ◽  
Yulei Gub ◽  
Yanhua Guo ◽  
Wenjun Wuc ◽  
Cong Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Aging Temperature ◽  
Aging Treatment ◽  
Strengthening Mechanism ◽  
Solution Treated ◽  
Α Phase ◽  
Treatment Procedures ◽  
Comprehensive Study

This work presents a comprehensive study on the microstructure evolution and mechanical property under different heat treatment procedures of a new near β type titanium Ti-5321(Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe). Two solution temperatures(830°C and 900°C) and a group of aging temperatures(300-650°C) were carried out to investigate the influence of heat treatment on this new alloy. The strengthening mechanism of Ti-5321 after solution and aging treatment was discussed by analyzing the microstructure and its mechanical properties. The best ultimate tensile strength can be achieved to 1564 MPa with 5% on elongation when solution treated at 830°C and aging at 450°C for this new alloy. The lamellar and globular α grains can be found in all 830°C solution treated specimens which contribute to a better ductility. Ultra-fine α phase can be found in all low aging temperature treated specimens but will coarsen significantly when raising the aging temperature and thus increase the tensile strength and lower the ductility. All these results can provide a comprehensive guidance on heat treatment for this new near β type titanium in the future.

Microstructure and Property of a New Metastable β Titanium Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 932-936 ◽  
Author(s):  
Xin Nan Wang ◽  
Yue Fei ◽  
Xiao Hu Zhou ◽  
Zhi Shou Zhu ◽  
Jun Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Titanium Alloy ◽  
Aging Temperature ◽  
Volume Fraction ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Optical Microscope ◽  
Solution Treated ◽  
Α Phase ◽  
Scanning Electron

The evolution regularities of microstructure and property of a new metastable β titanium alloy with different solution treatment and aging treatment were studied using optical microscope (OM), scanning electron microscopy (SEM) and tensile test. The results show that, the volume fraction of primary α phase decreases and globularization of α phase occurs with the increasing aging temperature from 540 to 580 and solution treated temperature from 800 to 820. When the solution treated temperature is 820, the acicular secondary α phase precipitates along β grain boundary. The strength of the investigated alloy increases and the ductility decreases with the solution treated temperature increasing. While the strength of the investigated alloy increases and the ductility decreases with the aging temperature decreasing.

Thermal Stability and Mechanical Properties of Ti-15-3 Titanium Alloy

2016 ◽  
Vol 849 ◽  
pp. 232-237 ◽  
Author(s):  
Qing Rui Wang ◽  
Xing Wu Li ◽  
Ai Xue Sha ◽  
Xin Qing Zhao ◽  
Yong Qi Zhu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
Aging Time ◽  
Β Phase ◽  
Ω Phase ◽  
Microstructure Stability ◽  
Α Phase ◽  
Strength And Ductility

The microstructure stability and tensile properties of Ti-15-3 titanium alloy were investigated by aging the alloy at different conditions. The results showed that when the temperature was below 250°C, ω phase precipitates and the tensile strength increased with increasing aging time. Although there were a little of ω phase after aging at 200C for 1000h, Ti-15-3 alloy still presented good strength and ductility. When the aging temperature was 250°C~400°C, ω precipitation or β’ phase separation occurred from β matrix, and finally transformed to α precipitates. The tensile strength increased firstly and then decreased with increasing aging time. When aged at above 400°C, α phase precipitated fast from the alloy, and the strength increased gradually.

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