The deformation and microstructure of Ti-3Al-2.5V tubular component for non-uniform temperature hot gas forming

In this paper, three 70 % expansion ratio Ti-3Al-2.5V tubular parts were formed by non-uniform temperature hot gas forming with different temperature distributions. The deformation behavior, thickness distribution, microstructure, and mechanical property of tubular parts were studied. The result shows that a suitable temperature difference between forming zone and transition zone is beneficial for axial feeding, which promote the thickness distribution uniform. The number of wrinkles in forming zone is affected by the temperature distribution. There are two wrinkles, one wrinkle, and three wrinkles when the temperature differences are 0, 50, and 15 °C, and the max thinning ratio is 24.9, 24.1, and 18 %, respectively. When the temperature difference is 15 °C, the microstructure and mechanical property is uniform.