A kind of rolling method of ta7 titanium alloy plate

Abstract

The invention discloses a TA7 titanium alloy plate rolling method. The TA7 titanium alloy plate rolling method comprises the steps of 1 obtaining a composite plate through preparation and then performing first heating treatment; 2 separating TA7 titanium alloy plate blanks and the performing first fire-time rolling to obtain first semi-finished product plate blanks; 3 conducting cutting treatment on the first semi-finished product plate blanks to obtain second semi-finished product plate blanks; 4 performing second heating treatment on the second semi-finished product plate blanks; 5 conducting second fire-time rolling on the second semi-finished product plate blanks to obtain third semi-finished product plate blanks; 6 conducting cutting treatment on the third semi-finished product plate blanks to obtain fourth semi-finished product plate blanks; 7 conducting third heating treatment on the fourth semi-finished product plate blanks; 8 conducting fir-time rolling on the fourth semi-finished product plate blanks to obtain TA7 titanium alloy plates. By means of the TA7 titanium alloy plate rolling method, titanium alloy plates of various specifications are produced by using one titanium alloy plate, meanwhile plate collapse, cracking and other phenomena caused by rolling after steering are avoided, production efficiency is improved, and the difficulty in the production process is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of titanium and titanium alloy plates, and in particular relates to a rolling method of TA7 titanium alloy plates. Background technique [0002] TA7 titanium alloy is a medium-strength α-type titanium alloy, which is mainly used for key parts such as aero-engine components, space thruster components and ultra-low temperature storage devices. Easy to crack. Because the titanium alloy plate is a single-phase titanium alloy, the texture formed during the hot rolling process has a strong influence on the subsequent cold rolling rolling direction (the heredity of the structure formed by processing at high temperature cannot be changed at low temperature), so it cannot be changed like other For titanium alloys, plates that are cut to the finished width after the second or third fire rolling can only be expanded and rolled using the slab width during the first fire rolling, that is, in the first fir...

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Problems solved by technology

[0002] TA7 titanium alloy is a medium-strength α-type titanium alloy, which is mainly used for key parts such as aero-engine components, space thruster components and ultra-low temperature storage devices. easy to crack

Because the titanium alloy plate is a single-phase titanium alloy, the texture formed during the hot rolling process has a strong influence on the subsequent cold rolling rolling direction (the heredity of the structure formed by processing at high temperature cannot be changed at low temperature), so it cannot be changed like other For titanium alloys, plates that are cut to the finished width after the second or third fire rolling can only be expanded and rolled using the slab width during the first fire rolling, that is, in the first fire rolling process The width of the finished product is rolled out in the middle. If the rolling direction is changed during the hot rolling process, it will cause cracking, chipping, slag, and even injury during cold rolling.

[0003] The current domestic rolling method for TA7 alloy is usually: 1) In the first fire rolling, the rolling direction is extended after widening and reversing, so as to ensure that the rolling direction of hot rolling and subsequent cold rolling is consistent, so that Avoid the texture change caused by changing the rolling direction of hot rolling; 2) In order to make full use of the high temperature of the first fire rolling (the subsequent hot rolling is generally rolled at a lower temperature to ensure the structure and performance), 3) The hot rolling is completed by three-fire rolling (rolled to about 4mm), and the deformation of the second-fire rolling and the third-fire rolling is relatively small Existing method has problem as: 1) is not suitable for producing the TA7 sheet material of multiple width specifications, because widening and reversing can only form a fixed width specification during the rolling of the first firing, and follow-up non-reversing then causes a The slab can only produce a plate of one specification (width), and the application of the alloy plate is a variety of width specifications, which easily causes a large amount of material accumulation and inventory for the producer; 2) The alloy plate is easy to crack, and the first fire During the second rolling, the structure still stays in the slab structure stage with coarse grains. Even high temperature and large deformation can easily cause serious cracking on the surface and edge of titanium alloy, resulting in low yield and complicated and difficult surface treatment process.

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