Resistance heating superplastic forming and influence of current on deformation mechanism of TA15 titanium alloy

2014 ◽  
Vol 76 (9-12) ◽  
pp. 1673-1680 ◽  
Author(s):  
Jingyuan Liu ◽  
Kaifeng Zhang
Keyword(s):  
Titanium Alloy ◽  
Deformation Mechanism ◽  
Superplastic Forming ◽  
Resistance Heating ◽  
Ta15 Titanium Alloy

scholarly journals LBW/SPF/DB Combined Processing and Microstructure of TA15 Titanium Alloy Four-Layer Sandwich Structure with Square Grid

2014 ◽  
Vol 6 ◽  
pp. 563047
Author(s):  
Jiang Shaosong ◽  
Li Baoyong ◽  
Liu Yang ◽  
Zhang Kaifeng
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
Sandwich Structure ◽  
Superplastic Forming ◽  
Welding Parameters ◽  
Columnar Crystal ◽  
Square Grid ◽  
Ta15 Titanium Alloy

The process combining laser beam welding, superplastic forming, anddiffusion bonding (LBW/SPF/DB) was performed to fabricate the TA15 titanium alloy sandwich structure with square grid. The microstructure of different regions before and after superplastic forming was also analyzed. The results showed that the laser welded joints of core structure own good superplastic formability under the condition that the laser welding parameters were optimized. The microstructure near the fusion line is columnar crystal and inside the columnar crystal the acicular martensite appeared. The heat-affected zone is relatively narrow and with no obvious grain growth. At 925°C, under the condition thatthe loading-time curve was optimized, the external outline of the LBW/SPF/DB formed hollow four-layer sandwich structure is clear and the strengthened ribs areupright. It shows good diffusion bonding quality between the ribs and panels. And the bonded ratio between the upright ribs which rely on each other is above 90%. After superplastic forming, the grain size of the TA15 workpieceincreases but remains equiaxed grain. The grain size of laser welded joints also significantly grew up, and the heat-affected zone almost disappeared in this zone. The typical cast microstructure of rapid cooling turned to be the deformed microstructure, creating a better overall performance of the two-state organizations.

Pulse Current Auxiliary Tensile and Bulging of Light Metal Alloy

2013 ◽  
Vol 690-693 ◽  
pp. 2356-2360 ◽  
Author(s):  
Jing Yuan Liu ◽  
Kai Feng Zhang ◽  
Shao Song Jiang
Keyword(s):  
Titanium Alloy ◽  
Magnesium Alloy ◽  
Pulse Current ◽  
Superplastic Forming ◽  
Az31 Magnesium Alloy ◽  
Forming Process ◽  
Polarity Effect ◽  
Tensile Process ◽  
Ta15 Titanium Alloy ◽  
The Impact

Pulse current effects during hot tensile process and superplastic forming process of AZ31 magnesium alloy and TA15 titanium alloy were investigated in this paper. The experimental results indicate that the current can produce polarity effect to coarse grain AZ31 magnesium alloy, but to fine grained TA15 titanium alloy, the polarity effect is not obvious. The impact of electron wind force can change the strength of material during tensile process and affect final shape of part, making the dome of AZ31 hemisphere part deviated from the axis to the side of positive pole during superplastic forming process. In addition, the impact of current depends on current density and dislocation density.

scholarly journals Constitutive modeling for the simulation of the superplastic forming of TA15 titanium alloy

2019 ◽  
Vol 164 ◽  
pp. 105178 ◽  
Author(s):  
Tabassam Yasmeen ◽  
Zhutao Shao ◽  
Lei Zhao ◽  
P. Gao ◽  
Jianguo Lin ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Constitutive Modeling ◽  
Superplastic Forming ◽  
Ta15 Titanium Alloy

Removal mechanism of surface cleaning on TA15 titanium alloy using nanosecond pulsed laser

2021 ◽  
Vol 139 ◽  
pp. 106998
Author(s):  
Zhichao Li ◽  
Donghe Zhang ◽  
Xuan Su ◽  
Shirui Yang ◽  
Jie Xu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Pulsed Laser ◽  
Surface Cleaning ◽  
Removal Mechanism ◽  
Nanosecond Pulsed Laser ◽  
Ta15 Titanium Alloy

scholarly journals Hot Deformation Behavior and Processing Maps of a New Ti-6Al-2Nb-2Zr-0.4B Titanium Alloy

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2456
Author(s):  
Zhijun Yang ◽  
Weixin Yu ◽  
Shaoting Lang ◽  
Junyi Wei ◽  
Guanglong Wang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Flow Stress ◽  
Constitutive Equation ◽  
Deformation Mechanism ◽  
Power Dissipation ◽  
Hot Deformation ◽  
Dissipation Rate ◽  
Dynamic Recovery ◽  
Processing Maps ◽  
Temperature Range

The hot deformation behaviors of a new Ti-6Al-2Nb-2Zr-0.4B titanium alloy in the strain rate range 0.01–10.0 s−1 and temperature range 850–1060 °C were evaluated using hot compressing testing on a Gleeble-3800 simulator at 60% of deformation degree. The flow stress characteristics of the alloy were analyzed according to the true stress–strain curve. The constitutive equation was established to describe the change of deformation temperature and flow stress with strain rate. The thermal deformation activation energy Q was equal to 551.7 kJ/mol. The constitutive equation was ε ˙=e54.41[sinh (0.01σ)]2.35exp(−551.7/RT). On the basis of the dynamic material model and the instability criterion, the processing maps were established at the strain of 0.5. The experimental results revealed that in the (α + β) region deformation, the power dissipation rate reached 53% in the range of 0.01–0.05 s−1 and temperature range of 920–980 °C, and the deformation mechanism was dynamic recovery. In the β region deformation, the power dissipation rate reached 48% in the range of 0.01–0.1 s−1 and temperature range of 1010–1040 °C, and the deformation mechanism involved dynamic recovery and dynamic recrystallization.

Fractal studies on primary phase morphology of TA15 titanium alloy after hot compressive deformation

2011 ◽  
Vol 16 (3) ◽  
pp. 343-346
Author(s):  
Xia-wei Yang ◽  
Jing-chuan Zhu ◽  
Zhong-hong Lai ◽  
Yong Liu ◽  
Jia-jun Zhan
Keyword(s):  
Titanium Alloy ◽  
Primary Phase ◽  
Phase Morphology ◽  
Compressive Deformation ◽  
Ta15 Titanium Alloy

Superplastic Forming and Pressure Welding of Multilayer Cellular Structures

2012 ◽  
Vol 735 ◽  
pp. 409-414 ◽  
Author(s):  
Rinat V. Safiullin
Keyword(s):  
Titanium Alloy ◽  
Solid State ◽  
Fatigue Testing ◽  
Superplastic Forming ◽  
Cellular Structures ◽  
Pressure Welding ◽  
Joint Formation ◽  
Academy Of Sciences ◽  
Non Destructive

The paper describes the results of long-term investigations on the development of the technology of superplastic forming and pressure welding (SPF/PW) conducted at the Institute for Metals Superplasticity Problems, Russian Academy of Sciences for producing standard articles of aero-space engineering, such as hollow blades, wing and shell panels. The process of solid state joint formation in titanium alloy sheets during SPF was studied. Different investigation techniques were developed. The results of the mechanical and fatigue testing as well as non-destructive inspection of hollow blades are presented. The prospects of the development of the SPF/PW technology are considered and the latest results are discussed.

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