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Open AccessArticle

Hot Gas Pressure Forming of Ti-55 High Temperature Titanium Alloy Tubular Component

1
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
2
Institute of High Pressure Fluid Forming, Harbin Institute of Technology, Harbin 150001, China
3
Capital Aerospace Machinery Corporation Limited, Beijing 100076, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(20), 4636; https://doi.org/10.3390/ma13204636
Received: 7 September 2020 / Revised: 13 October 2020 / Accepted: 14 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Advanced Metal Forming Processes)
In this paper, hot gas pressure forming (HGPF) of Ti-55 high temperature titanium alloy was studied. The hot deformation behavior was studied by uniaxial tensile tests at temperatures ranging from 750 to 900 °C with strain rates ranging from 0.001 to 0.05 s−1, and the microstructure evolution during tensile tests was characterized by electron backscatter diffraction. Finite element (FE) simulation of HGPF was carried out to study the effect of axial feeding on thickness distribution. Forming tests were performed to validate this process for Ti-55 alloy. Results show that when the temperature was higher than 750 °C, the elongation was large enough for HGPF of Ti-55 alloy. Dynamic recrystallization (DRX) occurred during the tensile deformation, which could refine the microstructure. The thickness uniformity of the formed part could be improved by increasing feeding length. The maximum thinning ratio decreased from 27.7% to 11.5% with the feeding length increasing from 0 to 20 mm. A qualified Ti-55 alloy component was successfully formed at 850 °C, the microstructure was slightly refined after forming, and the average post-form yield strength and peak strength were increased by 8.7% and 6.9%, respectively. Pre-heat treatment at 950 °C before HGPF could obtain Ti-55 alloy tubular component with bimodal microstructure and further improve the post-form strength. View Full-Text
Keywords: Ti-55 titanium alloy; hot gas pressure forming; processing windows; microstructure; post-form strength Ti-55 titanium alloy; hot gas pressure forming; processing windows; microstructure; post-form strength
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MDPI and ACS Style

Wang, K.; Shi, C.; Zhu, S.; Wang, Y.; Shi, J.; Liu, G. Hot Gas Pressure Forming of Ti-55 High Temperature Titanium Alloy Tubular Component. Materials 2020, 13, 4636.

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