Characteristics of titanium alloy materials such as titanium bar and titanium alloy bar and categories of heat treatment technology of the rod
TC11 titanium alloy bar is a kind of alpha + beta heat-resisting titanium alloy, which is mainly used for manufacturing compressor disc, blade and other parts of aircraft. It is the main titanium alloy material used in domestic aviation engine. It has been widely used in rotating parts of rocket engine. With the wide application of the alloy, the requirements of various technical indexes are more and more strict.
In the deformation of titanium alloy semi-finished products, especially in the deformation of two phase titanium alloy semi-finished products, alloy composition, the original organization, heating system, deformation rate, deformation uniformity and deformation temperature condition is the basic factors influencing the macrostructure rod end, and different organizations can greatly change the mechanical properties of the semi-finished products. Researchers with forging and rolling equipment production specification for Φ Φ 29 mm and 73 mm of TC11 titanium alloy rod, study the influence of different thermal processing on the microstructure and mechanical properties of its.
Experiment selects three times for a company's vacuum material since the electricity arc smelting ingot, perform similar craft, breakdown, forging provide specifications for 150 mm strip rolling billet and Φ Φ 125 mm fine forging machine forging blank, using the optical microscope magnified 100 times to observe, the rupture were relatively bulky shaft such as organization and uniform.
The billet in precision forging machine and equipment production specifications for HSM for Φ Φ 29 mm and 73 mm of TC11 titanium alloy rod, the heating temperature is 970 ℃, the deformation velocity of 2.5 m/s.
Precision forging technology: using precision forging machine equipment fire times 4 times deformation are made, and the total deformation of 65.9%, with an average of 13 mm, production Φ 73 mmTC11 forging of titanium alloy rod. Using fine forging machine equipment to fire three times 9 a deformation of a single fire time average deformation of 61.1%, the average reduction of 8 mm, production Φ 29 mmtc11 forging of titanium alloy rod.
Rolling technology: using strip equipment to conduct a fire time 9 times out of shape, the total deformation of 76.3%, with an average of 35 mm, 73 mmtc11 production Φ titanium alloy rolling bar. Two fire times using continuous equipment to 15 a deformation of a single fire time deformation of 80.3% on average, an average reduction of 29 mm, production Φ 29 mmtc11 titanium alloy rolling bar.
The samples were annealed at 950 ° c /1h·AC+530 ° c /6h·AC to test the microstructure and properties of the finished bar with different processes. The test results show that:
(1) The precision forging process of TC11 specifications for 73 mm and Φ Φ 29 mm bar finished product, its microstructure than strip craft production organization of the bar is small, and good uniformity.
(2) At the same heating temperature, the mechanical properties of TC11 titanium alloy bar produced by the precision forging process are better than the rolled bar, which is suitable for the production of blade bar with high demands on microstructure and properties. Compared with the precision forging production method, the new hot continuous rolling process has high production efficiency, good flatness and surface quality, and can save the production of finished products.
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