Effects of different hot working processes on the structure and properties of TC11 titanium alloy and TC11 titanium rod

               
Update: 20-02-2021
               
Abst:

TC11 titanium alloy is a kind of α+β heat-resistant tit […]

TC11 titanium alloy is a kind of α+β heat-resistant titanium alloy, mainly used in the manufacture of parts such as aircraft compressor discs and blades. It is the main titanium alloy material for domestic aeroengines. It has been widely used in the rotating parts of rocket engines. With the wide application of the alloy, the requirements for its various technical indicators have become more and more stringent.
In the deformed semi-finished products of titanium alloys, especially in the deformed semi-finished products of two-phase titanium alloys, the alloy composition, original structure of the blank, heating system, deformation rate, deformation uniformity and deformation temperature conditions are the basic factors that affect the final macroscopic structure of the bar. Factors, and different organizations can greatly change the mechanical properties of semi-finished products. Researchers use forging and rolling equipment to produce TC11 titanium alloy bars with specifications of Φ73mm and Φ29mm, respectively, to study the effects of different thermal processing processes on their structure and properties.
The material used in the experiment is a three-time vacuum consumable arc smelting ingot produced by a certain company. The similar process is implemented. The billet for billeting and forging provides hot continuous rolling billet of Φ150mm and blank for forging of precision forging machine of Φ125mm, magnified by optical microscope Observed at 100 times, the morphology of the structure is relatively coarse equiaxed structure and uniform.
   TC11 titanium alloy bars with Φ73mm and Φ29mm specifications are produced on the precision forging machine and hot continuous rolling equipment of the above-mentioned billets respectively. The heating temperature is 970℃ and the deformation speed is 2.5m/s.
  Precision forging process: using precision forging machine equipment to deform 4 times in one fire, the total deformation is 65.9%, and the average reduction is 13mm, to produce Φ73 mmTC11 titanium alloy forged bars. The precision forging machine is used to deform 9 passes of three fires. The average deformation of a single fire is 61.1%, and the average reduction is 8mm to produce Φ29mm TC11 titanium alloy forged bars.
  Rolling process: using hot tandem rolling equipment to deform 9 passes in one fire, with a total deformation of 76.3% and an average reduction of 35mm, to produce Φ73mmTC11 titanium alloy rolled bars. The hot tandem rolling equipment is used to deform 15 passes in two fires. The average deformation in a single fire is 80.3%, and the average reduction is 29mm to produce Φ29mm TC11 titanium alloy rolled bars.
  The sample is annealed at 950℃/1h·AC+530℃/6h·AC, and then the structure and performance of finished bars of different processes are tested. The results showed that:
(1) The TC11 produced by the precision forging process has specifications of Φ73mm and Φ29mm bar finished products, and its microstructure is smaller than that of the bar produced by the hot continuous rolling process, and its uniformity is better.
(2) At the same heating temperature, the mechanical properties of TC11 titanium alloy bars produced by the precision forging process are better than those of rolled bars, and are suitable for the production of blades with high structure and performance requirements; compared with the precision forging production method , The new hot continuous rolling process has high production efficiency, good product flatness and surface quality, and can save the production of finished products.

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