Effect of annealing on microstructure and mechanical properties of TC4 titanium alloy aeroengine blades

doi:10.13251/j.issn.0254-6051.2024.10.022

Abstract

Abstract: TC4 alloy third-stage rotor blade for aeroengine was annealed at different temperatures (600-950 ℃) with different cooling methods (air cooling and water cooling). The microstructure was analyzed by OM, SEM and EBSD. The microhardness and mechanical properties at room temperature were tested by Vickers hardness tester and tensile testing machine. The effect of annealing treatment on the microstructure and mechanical properties of the TC4 titanium alloy blades was studied. The results show that the volume fraction of α phase changes little with the increase of annealing temperature below 850 ℃, and the grain size of α phase is about 12 μm. When the annealing temperature exceeds 850 ℃, the acicular α phase appears in the microstructure. When the annealing temperature is below 900 ℃, the hardness of the air-cooled specimen is 5-10 HV0.2 higher than that of the water-cooled specimen. When the annealing temperature exceeds 850 ℃, the content of acicular α phase increases and the microhardness rapidly increases. The maximum strength appears at the annealing temperature of 600 ℃, but with relatively low elongation. Under air cooling conditions, at annealing temperature of 800 ℃, the tensile strength reaches 1033.7 MPa, the elongation is 23.2%, and the comprehensive mechanical properties of the blade are optimal.

Key words: TC4 titanium alloy blade, annealing, microstructure, hardness, mechanical properties

CLC Number:

TG156.2

Wang Qingjuan, Du Xudong, Jiang Li, Li Zhiyi, Liu Dan, Wang Wei. Effect of annealing on microstructure and mechanical properties of TC4 titanium alloy aeroengine blades[J]. Heat Treatment of Metals, 2024, 49(10): 126-132.

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