Thickness and Microstructure Analysis on Hot Gas Bulged Cup-Shaped Parts of Ti-22Al-24.5Nb-0.5Mo

Yong Wu; Gang Liu; Zhi Qiang Liu; Bei Bei Kong

doi:10.4028/www.scientific.net/KEM.716.138

Paper Titles

Formability of AA6082-T6 at Warm and Hot Stamping Conditions
p.107

Formability of Explosive Welded Mg/Al Bimetallic Bar
p.114

Investigation on Hardening and Softening Behavior of Steel after Rapid Strain Rate Changes
p.121

The Influence of the Punch Shape and the Cutting Method on the Limit Strain in the Hole Expansion Test
p.129

Thickness and Microstructure Analysis on Hot Gas Bulged Cup-Shaped Parts of Ti-22Al-24.5Nb-0.5Mo
p.138

Evaluation of Tribological Performance of Lubricants and Nitrided Die for Hot Forming of Steel Using Tapered-Plug Penetration Test
p.147

Extended Conical Tube-Upsetting Test to Investigate the Evolution of Friction Conditions
p.157

Identification of Friction Coefficient in Forging Processes by Means T-Shape Tests in High Temperature
p.165

Investigation on Friction Conditions during a Severe Bending Deformation on a Thick Plate
p.176

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Thickness and Microstructure Analysis on Hot Gas Bulged Cup-Shaped Parts of Ti-22Al-24.5Nb-0.5Mo

Abstract:

Ti₂AlNb based alloy has been paid more and more attention in recent years because of their high application potential in jet engines for good mechanical properties at high temperature. However, the control of microstructure and mechanical properties for components in sheet metal forming is very difficult because the complex phase transformation. In this paper, a cylindrical part was produced by hot gas forming and the formability of a Ti-22Al-24.5Nb-0.5Mo sheet with thickness of 2mm was studied at 985°C. It is found that the parts could be formed with small bottom-corner radius of 4mm with outer diameter of 60mm and the depth of 20mm. The strain distribution and thinning ratio of the parts were analyzed. The maximum thinning ratio was 56.3% near to the small corner. The microstructures of the original blank and the cylindrical parts were observed by optical microscopic (OM). It is found that the orthorhombic (O) phase and α₂ phase significantly reduced during the forming process. On the other hand, at different position of the parts, different microstructures appear because of different strain values.