Small compressor blades of titanium alloy are important mechanical structural components of advanced aircraft engines. In the present study, the preheating scheme and the forging process of the small compressor blade were modeled by the commercial software DEFORM3D and the forging experiments were conducted on a 10,000KN screw press. The results show that the reasonable preheating temperature for the small blade should be controlled in 960-970°C. The geometric shape and size of the blade preform influenced not only overlap and underfilling defects but also the dimensional precision of small compressor blade forgings. On this basis, the optimized geometric shape of the blade preform was obtained and the compressor blades were well formed by limited forging process experiments.
The hot power spinning process of TA1 has been studied on the base of isothermal plane compression model in this paper. The microstructures of spun workpieces and plane compression specimens are analyzed and the microstructure evolution mechanism has been investigated. The results reveal that the microstructure evolution has similar mechanism between power spinning and plane compression. Plane strain compression can be used to predict and control the microstructure of as-spun TA1 workpiece.
The isothermal forging process of a bracket and its microstructure evolution of Mg-10Gd-2Y-0.5Zn-0.3Zr alloy have been investigated in the present study. The results show that the bracket with thin-web and high-rib is well formed through modifying corners and adding an active damping block into male die. Amounts of lamellae and particles distribute uniformly on the matrix after the isothermal forging process and ageing process. The isothermal forging process has an obvious effect on the precipitation behaviour of secondary phases, while it did not change the grain size greatly. With the increase of ageing time, more secondary phases precipitate from α-Mg matrix until 60h. The optimal ultimate tensile strength and elongation of the peak-aged alloy are 382MPa and 4.03%, respectively. The combined effects of LPO and β′ phases contribute to the high strength of the peak-aged alloy.
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