Preparation method of TA7 titanium alloy cake

Abstract

The invention provides a preparation method of a TA7 titanium alloy cake. The method includes the following steps of firstly, cutting and removing a dead head and an ingot bottom of a TA7 titanium alloy ingot, and removing surface defects of the TA7 titanium alloy ingot; subjecting the TA7 titanium alloy ingot to blooming forging to obtain a primary forging stock; subjecting the primary forging stock to intermediate forging to obtain a semi-finished forging stock; and sawing the semi-finished forging stock, and then performing forming forging to obtain the TA7 titanium alloy cake. According to physical characteristics of TA7 titanium alloy materials, by means of proportioning design of chemical components and comprehensive control of technological parameters of initial forging temperatures, final forging temperatures, total forging ratios and the like, uniform control of microstructural dimensions of the primary forging stock, the semi-finished forging stock and the TA7 titanium alloy cake is achieved; and the micro-structure of the TA7 titanium alloy cake is uniform, low temperature mechanical performances and room temperature mechanical performances are excellent, and the preparation method is suitable for large-scale industrial production.

Description

technical field

[0001] The invention belongs to the technical field of titanium alloy material preparation, and in particular relates to a preparation method of TA7 titanium alloy cake material. Background technique

[0002] TA7 titanium alloy (nominal composition is Ti-5Al-2.5Sn) is a single-phase α-titanium alloy, which is widely used in aero-engine components, Key components such as space thruster components and ultra-low temperature storage devices. Due to the poor processing plasticity of TA7 titanium alloy in the temperature range of the two-phase region, it is easy to form cracks inside and outside the forging, the allowable deformation of forging is small, and the objective existence of the dead zone of forging deformation makes the microstructure of TA7 titanium alloy not easy. To achieve homogenization, there are certain difficulties in the quantitative control of microstructure parameters. In addition, the addition ratio of strengthening elements such as aluminu...