Method for manufacturing fine-grain TA15 titanium alloy sheet for superplastic forming

A superplastic forming and titanium alloy technology, applied in metal rolling, temperature control and other directions, can solve the problems of difficult operability, complicated procedures and increased workload, and achieve simplified procedures, good hardenability, and reduced work. amount of effect

Active Publication Date: 2014-05-14
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the traditional process, when preparing TA15 titanium alloy thin plate with a thickness of less than 4mm, in order to form the required Widmanstatten structure, it is necessary to perform quenching above the β transformation point when rolling to a thickness of 10mm-12mm, because the thickness of the plate is thin, The rapid cooling of the plate heated at high temperature after entering the water will cause serious distortion and deformation of the plate. It is extremely difficult to perform subsequent surface grinding on such a plate with extremely poor flatness, and it will increase the workload of subsequent leveling, grinding, cutting and other processes. Severely enlarged, the process is complicated, often resulting in the surface oxide skin not being removed, affecting the consequences of the poor surface of the final product
Moreover, due to the above-mentioned difficult operation and improper process control, the produced TA15 sheet has a large difference in the horizontal and vertical structures, and the uniformity of the microstructure is poor.
[0004] Therefore, the existing processing methods are no longer suitable for the preparation of fine-grained TA15 titanium alloy sheets for superplastic forming, and technical improvement is urgently needed

Method used

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  • Method for manufacturing fine-grain TA15 titanium alloy sheet for superplastic forming
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  • Method for manufacturing fine-grain TA15 titanium alloy sheet for superplastic forming

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Effect test

Embodiment 1

[0033] Preparation of fine-grained TA15 titanium alloy sheet with a thickness of 0.6 mm for superplastic forming:

[0034] Step 1. Select a TA15 titanium alloy slab with a thickness of 120mm. After passing the external dimension and internal flaw detection inspection, it is sent to a 2800mm four-roll reversing hot rolling mill. The initial rolling temperature is 10°C above the β transformation point, and the final Under the condition that the rolling temperature is 10°C below the β transformation point, the first rolling of 6 passes is carried out, and the processing ratios of each pass are: 10%, 18%, 23%, 26%, 28%, 17%, and then The upper and lower surfaces of the TA15 titanium alloy slab after the first rolling are sprayed repeatedly at the same time to rapidly water-cool to room temperature at a cooling rate of not less than 10°C / s, and the first slab with a thickness of 30mm is obtained after surface grinding. Half finished board;

[0035] Step 2. Send the first semi-fini...

Embodiment 2

[0040] Preparation of fine-grained TA15 titanium alloy sheet with a thickness of 0.8 mm for superplastic forming:

[0041] Step 1. Select a TA15 titanium alloy slab with a thickness of 150mm. After passing the appearance size and internal flaw detection inspection, it is sent to a 2800mm four-roll reversing hot rolling mill. The initial rolling temperature is 10°C above the β transformation point, and the final Under the condition that the rolling temperature is 15°C below the β transformation point, the first rolling of 7 passes is carried out, and the processing ratios of each pass are: 10.5%, 20%, 25%, 28%, 20%, 9%, 5% %, then the upper and lower surfaces of the TA15 titanium alloy slab after the first rolling are sprayed repeatedly at the same time to make it rapidly water-cooled to room temperature at a cooling rate of not less than 10°C / s, and the thickness is obtained after surface grinding. 40mm first semi-finished sheet;

[0042] Step 2. Send the first semi-finished ...

Embodiment 3

[0047] Preparation of fine-grained TA15 titanium alloy sheet with a thickness of 1.0 mm for superplastic forming:

[0048] Step 1. Select a TA15 titanium alloy slab with a thickness of 180mm. After passing the external dimension and internal flaw detection inspection, it is sent to a 2800mm four-roll reversing hot rolling mill. The initial rolling temperature is 12°C above the β transformation point, and the final Under the condition that the rolling temperature is 12°C below the β transformation point, the first rolling of 8 passes is carried out, and the processing ratios of each pass are: 8.5%, 15%, 21.5%, 28%, 21.5%, 19.2%, 5.5% %, 5%, and then repeatedly spray the upper and lower surfaces of the TA15 titanium alloy slab after the first rolling to make it rapidly water-cooled to room temperature at a cooling rate of not less than 10°C / s, and after surface grinding Obtain the first semi-finished sheet material that thickness is 45mm;

[0049] Step 2. Send the first semi-fi...

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Abstract

The invention provides a method for manufacturing a fine-grain TA15 titanium alloy sheet for superplastic forming. The method includes the following steps that firstly, primary rolling is carried out on a TA 15 titanium alloy board blank with a certain thickness, and surface grinding is carried out after water cooling; secondly, secondary rolling is carried out, and surface grinding is carried out after air cooling; thirdly, rolling is carried out for the third time, surface grinding is carried out after air cooling; fourthly, rolling is carried out for the fourth time, surface grinding is carried out after air cooling, and the fine-grain TA15 titanium alloy sheet with the thickness ranging from 0.6 mm to 2.5 mm for superplastic forming is obtained. A transverse metallographic structure and a longitudinal metallographic structure of the TA15 titanium alloy sheet are fine uniform isometric crystals, the size of crystalline grains is not larger than 6 micros, the extensibility is not less than 715 percent, and related technical requirements of superplastic forming are met.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a method for preparing a fine-grain TA15 titanium alloy sheet for superplastic forming. Background technique [0002] TA15 titanium alloy, whose nominal chemical composition is Ti-6.5Al-2Zr-1Mo-1V, is a titanium alloy with good comprehensive properties. The TA15 titanium alloy is mainly strengthened by the α-stable element Al, and a certain amount of neutral element Zr and β-stable elements Mo and V are also added for supplementary strengthening. TA15 titanium alloy has the same excellent welding performance as α-type titanium alloy and process plasticity close to α+β-type titanium alloy. [0003] With the rapid development of aviation, aerospace, shipbuilding and other industrial technologies, higher requirements are put forward for the performance of TA15 titanium alloy plates. According to the traditional process, when preparing TA15 ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B37/74C22F1/18
Inventor 王蕊宁付文杰李辉谢英杰周玉川陈钧伟王兴李维张娜张嫦娟舒滢邓超杨建朝
Owner WESTERN TITANIUM TECH
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