High temperature titanium alloy is one of the key materials of modern aviation engines, and is mainly used for forged parts such as compressor plates and blades of aviation engines to reduce the weight of the engine and increase the weight-to-weight ratio. The development trend of high temperature titanium alloys is to add rare earth elements. China has done a lot of research in this area. For example, Ti55 alloy and Ti60 alloy have been added with rare earth Nd, rare earth Y has been added to Ti600 alloy and rare earth Gd has been added to Ti633G alloy, which have achieved very good results in improving alloy properties. The addition of rare earth elements to improve the thermal stability of the alloy is mainly due to the interaction of rare earth elements with the oxygen in the alloy matrix to form complex compounds and purify the alloy matrix, thereby improving the thermal strength and thermal stability of the alloy. At present, the research results of 600 ℃ high temperature titanium alloy abroad have been used in aero engines, such as IMI834 in the United Kingdom, Ti-1100 in the United States, BT18Y in Russia, etc., which have achieved good results. TC17 titanium alloy is a near β-type alloy with excellent comprehensive properties. Its nominal composition is Ti-5Al-2Sn-2Zr-4Mo-4Cr (mass fraction,%). The alloy can be forged in the α + β phase region. Forging can be performed in the β phase region. It not only has high strength, hardenability and fracture toughness, but also has good heat stability, high fatigue performance and good hot workability. IMI550 titanium alloy is a heat-treated strengthened a + p-type titanium alloy successfully developed by British Empire Metals. Its nominal composition is TMAMMo-2Sn ~ 0.5Si, and the use temperature reaches 400 ° C. Compared with the American Ti6Al4V alloy, it is tensile resistant Increased strength by 10%.
According to the characteristics and application characteristics of IMI550 titanium alloy materials, it is planned to study the effect of rolling temperature on the microstructure and mechanical properties of IMI550 titanium alloy rods, in order to obtain a microstructure with well-matched comprehensive properties such as strength, plasticity and creep properties. Industrial production provides reasonable guidance for the formulation of reasonable and effective hot working processes.
(1) IMI550 titanium rod diameters 7; -60C, 7; -25C and% + 15C. The microstructures after rolling are equiaxed, biomorphic, and netted.
(2) IMI550 titanium rods with a mesh basket structure have a small necking at room temperature. The microfracture is composed of many straight cleavage facets. There are obvious tearing edges between the cleavage facets. Cleavage fracture characteristics, but there are a few small dimples of relatively small size and depth, indicating that it still has certain plastic characteristics; 400C high temperature tensile macro fracture center area appears coarse fiber area, microfracture center area is small and shallow Dimples' exhibited certain ductile fracture characteristics.
(3) IMI550 titanium alloy rods with equiaxed structure, bimorph structure, and net basket structure have a comparable tensile strength at room temperature and 400C high temperature, and the equiaxed structure and bimorph structure have similar plasticity, but the plasticity of net basket structure Poor, especially room temperature plasticity.
(4) IMI550 titanium alloy rods with a net basket structure have the best creep performance, followed by a two-state structure, and the equiaxed structure has the worst creep performance.
(5) IMI550 titanium rod specimens with equiaxed and biomorphic structures have obvious necking at macro-fracture at room temperature and 400C high temperature tensile, and micro-fractures form large and deep equiaxed dimples and cup-shaped shear Lip, showing obvious tough fracture characteristics.
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According to the characteristics and application characteristics of IMI550 titanium alloy materials, it is planned to study the effect of rolling temperature on the microstructure and mechanical properties of IMI550 titanium alloy rods, in order to obtain a microstructure with well-matched comprehensive properties such as strength, plasticity and creep properties. Industrial production provides reasonable guidance for the formulation of reasonable and effective hot working processes.
(1) IMI550 titanium rod diameters 7; -60C, 7; -25C and% + 15C. The microstructures after rolling are equiaxed, biomorphic, and netted.
(2) IMI550 titanium rods with a mesh basket structure have a small necking at room temperature. The microfracture is composed of many straight cleavage facets. There are obvious tearing edges between the cleavage facets. Cleavage fracture characteristics, but there are a few small dimples of relatively small size and depth, indicating that it still has certain plastic characteristics; 400C high temperature tensile macro fracture center area appears coarse fiber area, microfracture center area is small and shallow Dimples' exhibited certain ductile fracture characteristics.
(3) IMI550 titanium alloy rods with equiaxed structure, bimorph structure, and net basket structure have a comparable tensile strength at room temperature and 400C high temperature, and the equiaxed structure and bimorph structure have similar plasticity, but the plasticity of net basket structure Poor, especially room temperature plasticity.
(4) IMI550 titanium alloy rods with a net basket structure have the best creep performance, followed by a two-state structure, and the equiaxed structure has the worst creep performance.
(5) IMI550 titanium rod specimens with equiaxed and biomorphic structures have obvious necking at macro-fracture at room temperature and 400C high temperature tensile, and micro-fractures form large and deep equiaxed dimples and cup-shaped shear Lip, showing obvious tough fracture characteristics.
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