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Preparation method for TC2 titanium alloy large-sized plate blanks

A titanium alloy, large-scale technology, which is applied in the field of preparation of large-scale slabs of TC2 titanium alloys, can solve the problems of unstable product performance indicators, difficulties in large-scale slabs, uneven structure, etc. Good stability and uniform organization

Active Publication Date: 2012-04-18
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is very difficult to prepare high-quality TC2 titanium alloy large-scale slabs by ordinary forging processing methods. The main disadvantages are that there are often more cracks, internal cracks and other defects in material processing, uneven structure, and unstable product performance indicators. The pass rate is low, so the ordinary forging method is no longer suitable for the preparation of large-scale TC2 titanium alloy slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of 127mm×950mm×1590mm TC2 titanium alloy slab:

[0025] Step 1. Select a TC2 titanium alloy ingot with a size of Φ420mm, cut off the riser and bottom of the ingot, remove the skin pores of the ingot, and obtain a TC2 titanium alloy ingot with a size of Φ420mm×1395mm;

[0026] Step 2. Place the TC2 titanium alloy ingot with the skin pores removed in step 1 in a high-temperature furnace with a temperature of 750°C. When the temperature in the furnace reaches 800°C, keep it warm for 30 minutes, and then raise the temperature to TC2 at a heating rate of 1°C / min. 50°C above the β-transition point of titanium alloy and keep it warm for 290 minutes; use a 2,500-ton hydraulic press to cast the heat-preserved TC2 titanium alloy ingot at an initial forging temperature of 50°C above the β-transition point of TC2 titanium alloy, and the final forging temperature is not low Under the condition of 800°C, the billet is forged once, and cooled to room temperature in air to ...

Embodiment 2

[0032] Preparation of 210mm×1150mm×1240mm TC2 titanium alloy slab:

[0033] Step 1. Select a TC2 titanium alloy ingot with a size of Φ560mm, cut off the riser and bottom of the ingot, and remove the skin pores of the ingot to obtain a TC2 titanium alloy ingot with a size of Φ560mm×1210mm;

[0034] Step 2. Place the TC2 titanium alloy ingot with the skin pores removed in step 1 in a high-temperature furnace with a temperature of 800°C for 90 minutes, and then raise the temperature to 70°C above the β phase transition point of the TC2 titanium alloy at a rate of 2°C / min. ℃ and keep it warm for 230 minutes; using a 3150-tun hydraulic press, the TC2 titanium alloy ingot after heat preservation is opened and forged under the condition that the initial forging temperature is 70 ℃ above the β phase transition point of TC2 titanium alloy, and the final forging temperature is not lower than 800 ℃ Fire once, air-cool to room temperature to obtain billet; the process of billet forging is...

Embodiment 3

[0040] Preparation of 240mm×1200mm×1310mm TC2 titanium alloy slab:

[0041] Step 1. Select a TC2 titanium alloy ingot with a size of Φ690mm, cut off the riser and bottom of the ingot, and remove the skin pores of the ingot to obtain a TC2 titanium alloy ingot with a size of Φ690mm×1010mm;

[0042] Step 2. Place the TC2 titanium alloy ingot with the skin pores removed in step 1 in a high-temperature furnace with a temperature of 780°C. When the temperature in the furnace rises to 800°C, it is kept for 60 minutes, and then the temperature is raised to 1.5°C / min. 60°C above the β-transition point of TC2 titanium alloy and keep it warm for 260 minutes; using a 3150-ton hydraulic press, cast the heat-preserved TC2 titanium alloy ingot at an initial forging temperature of 60°C above the β-transition point of TC2 titanium alloy, and a final forging temperature of Under the condition of lower than 800°C, open billet forging once, and air cool to room temperature to obtain billet; the ...

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Abstract

The invention discloses a preparation method for TC2 titanium alloy large-sized plate blanks. The preparation method comprises the following steps of: 1, cutting off dead head and ingot bottom of the TC2 titanium alloy cast ingot and removing pores from the surface skin of the cast ingot; 2, cogging and forging the TC2 titanium alloy cast ingot for one heating time; 3, forging the cast ingot subjected to cogging and forging for one heating time to obtain a square billet; 4, performing chamfering drawing-out forging on the square billet for one heating time to obtain the plate blank; and 5, polishing all sides of the plate blank so as to eliminate the defects generated on the surface of the plate blank in the forging process and caused by temperature drop to obtain the TC2 titanium alloy large-sized plate blank. Repeated upsetting is combined with drawing-out forging; grains of titanium alloy are crushed completely by using a large-tonnage fast forging machine and a low-temperature large press-down method, and the obtained plate blank has fine and uniform tissue. The TC2 titanium alloy plate blank prepared by the method has high surface quality and uniform tissue; the product has few internal defects and high stability; and the qualification rate of the products is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy slab preparation, and in particular relates to a method for preparing a TC2 titanium alloy large-size slab. Background technique [0002] Titanium and titanium alloys have the advantages of light weight, high specific strength, and corrosion resistance, and play an important role in aviation, aerospace, ships, and weapon structural parts. With the continuous development of global titanium and titanium alloy preparation and processing technology, titanium alloys are increasingly used in aviation, aerospace, ships, automobiles, biomedical, chemical and other industries. [0003] TC2 titanium alloy plates are used as domestic supersonic aircraft parts by cold deformation forming. With the upgrading of domestic main fighters, the requirements for large-scale TC2 titanium alloy plates are increasing, and various mechanical properties and formability are also proposed. higher and higher requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C21D8/02
Inventor 王兴李维谢英杰李进元蒲宣舒滢吴华邓超王蕊宁曲恒磊杨建朝
Owner WESTERN TITANIUM TECH