Abstract
High pressure gas forming is a tubular component forming technology with pressurized gas at elevated temperature, based on QPF, HMGF and Hydroforming. This process can be used to form tube blank at lower temperatures with high energy efficiency and also at higher strain rates. With Ti-3Al-2.5V Ti-alloy tube, the potential of HPGF was studied further through experiments at the elevated temperatures of 650 ◦ C and 700 ◦ C. In order to know the formability of the Ti-alloy tube, tensile tests were also carried out. The results show that: at the temperatures of 650 ◦ C and 700 ◦ C, the flow curves exhibit the power-law constitutive relation until peak stress is reached and the deformability is suitable for the HPGF process of Ti-3Al-2.5V alloy tube. The effects of pressurization path on the corner filling process and thickness profile are obvious. The high pressure inflow process can result in temperature difference between the straight wall area and corner area, which makes the thickness profile special. Besides, with the stepped pressurization path, the more constant filling rate and better thickness profile can be obtained.
Highlights
The results show that: at the temperatures of 650 ◦C and 700 ◦C, the flow curves exhibit the power-law constitutive relation until peak stress is reached and the deformability is suitable for the high pressure gas forming (HPGF) process of Ti-3Al-2.5V alloy tube
At the temperature of 650 ◦C and strain rate of 10−1 s−1, the flow curve exhibits the power-law constitutive relation obviously until peak stress is reached, at which level a softening region leading to fracture is observed [11]
The true strain is still above 0.3 even if the strain rate is up to 10−1 s−1 at 700 ◦C and it is above 0.3 when the strain rate is 10−2 s−1 at 650 ◦C, which indicates that it is suitable for the HPGF process of Ti-3Al-2.5V alloy tube at lower temperatures
Summary
According to hot sheet metal forming of Ti-6242, increasing forming temperatures alone would not necessarily imply better forming characteristics and optimal forming conditions would be a combination of forming velocity, temperature and holding time, as verified by Eva-Lis Odenberger et al [2]. They investigated the possibility to design suitable thermo-mechanical forming processes for titanium sheet metal component with acceptable accuracy, using finite element (FE) analyses of hot sheet metal forming in the titanium alloy Ti–6Al–4V [5, 6]. The effects of pressurization path on the corner filling behavior and thickness distribution are discussed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
