Isothermal forging method of TC17 titanium alloy disc-shaped forge piece

Abstract

The invention relates to a forging method of a titanium alloy disc-shaped forge piece and particularly relates to an isothermal forging method of a TC17 titanium alloy disc-shaped forge piece. The method includes heating a titanium alloy rod ingot to the temperature which is smaller than a transformation temperature by 40 DEG C-50 DEGC, heating an upper flat die and a lower flat die to a temperature which is smaller than the transformation temperature by 40 DEG C-50 DEGC, and enabling the upper flat die to move downwards so that the rod ingot is subjected to first isothermal upsetting to form a primary biscuit at the strain rate of 0.001s<-1>-0.01s<-1> and then to second isothermal upsetting to form a secondary biscuit at the strain rate of 0.001s<-1>-0.01s<-1>, and the deformation amount is 30%-50%; heating the secondary biscuit to the temperature which is smaller than the transformation temperature by 20 DEG C-30 DEGC, heating an upper cavity die and a lower cavity die to the temperature which is smaller than the transformation temperature by 20 DEG C-30 DEGC, and forging the secondary biscuit by using a pressing machine so that the upper cavity die and the lower cavity die are molded to a forge piece under the conditions that the strain rate is 0.001s<-1>-0.01s<-1> and the deformation amount reaches 30%-50% in the cavity dies; and subjecting the forge piece to heat treatment after forging, wherein the heat treatment includes solid solution treatment and aging treatment. According to the method, the disc-shaped forge piece forged by the method is provided with ideal equiaxed structures and high performances, and the method is suitable for manufacturing forge pieces of compressor disks and turbine disks of aero-engines.

Description

technical field [0001] The invention relates to a forging method of a titanium alloy disc forging, in particular to an isothermal forging method of a TC17 titanium alloy disc forging. Background technique [0002] Titanium alloy has the characteristics of high strength, light weight and good corrosion resistance. It has important applications in the field of aviation and aerospace, especially the compressor discs and turbine discs of aero-engines. Due to the harsh working environment and complex stress, they are often It is formed by forging α+β type two-phase titanium alloy with excellent comprehensive performance. The disc forged with α+β two-phase titanium alloy has a series of advantages such as high strength, good fracture toughness, high hardenability and wide forging temperature range, which can meet the needs of loss tolerance design and high structure, high reliability and low manufacturing cost requirements. The change of microstructure has a significant impact o...

AI Technical Summary

Problems solved by technology

Although this method is also a forging method for TC17 titanium alloy disc forgings, it produces a forging with a full-network basket structure. If you want to obtain a forging with a two-state structure, this method cannot be realized.

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