Method for producing TC25 two-phase titanium alloy rod material with large specification

A large-scale, titanium alloy technology, applied in the field of preparation of large-scale TC25 two-phase titanium alloy rods, can solve the problems of unsuitable TC25 two-phase titanium alloy rods, unstable product performance indicators, and production difficulties, and achieve finished products Fewer internal defects, good product stability, and low processing costs

Active Publication Date: 2011-11-02
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 produce through ordinary forging processing methods. The main disadvantages are that there are often defects such as cracks and internal cracks in material processing, product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Use TC25 (Ti-6.7Al-1.5Sn-4Zr-2Mo-1W-0.15Si) two-phase titanium alloy ingot with a diameter of Φ700mm, cut off the ingot riser and ingot bottom, and remove the pores of the ingot skin;

[0019] (2) Use a 2,500-ton hydraulic press to open and forge the ingot after removing the skin pores in step (1) twice to obtain a forging billet. The initial forging temperature of the second firing is 100°C above the β transformation point of the ingot, the final forging temperature of the two firings is 900°C, and the cumulative deformation of the two firings is 80%;

[0020] (3) Air-cool the forging billet described in step (2) to room temperature, then polish the cracks on the surface of the forging billet, and place the polished billet under the condition that the initial forging temperature is 30°C above the β transformation point of the ingot Repeat upsetting and elongation forging twice, the final forging temperature is 900°C, and the cumulative deformation of forging is 120...

Embodiment 2

[0027] (1) Use TC25 (Ti-6.7Al-1.5Sn-4Zr-2Mo-1W-0.15Si) two-phase titanium alloy ingot with a diameter of Φ690mm, cut off the ingot riser and ingot bottom, and remove the pores of the ingot skin;

[0028] (2) Use a 2,500-ton hydraulic press to open and forge the ingot after removing the skin pores in step (1) twice to obtain a forged billet. The initial forging temperature of the second firing is 50°C above the β transformation point of the ingot, the final forging temperature of the two firings is 850°C, and the cumulative deformation of the two firings is 120%;

[0029] (3) Air-cool the forging billet described in step (2) to room temperature, then polish the cracks on the surface of the forging billet, and place the polished billet under the condition that the initial forging temperature is 40°C above the β transformation point of the ingot Repeat upsetting and elongation forging 3 times, the final forging temperature is 880°C, and the cumulative deformation of forging is 22...

Embodiment 3

[0036] (1) Use TC25 (Ti-6.7Al-1.5Sn-4Zr-2Mo-1W-0.15Si) two-phase titanium alloy ingot with a diameter of Φ620mm, cut off the ingot riser and ingot bottom, and remove the pores of the ingot skin;

[0037] (2) Use a 2000-ton hydraulic press to forge the ingot after removing the skin pores in step (1) twice to obtain a forged billet. The final forging temperature of the two firings is 860°C, and the cumulative deformation of the two firings is 100%;

[0038] (3) Air-cool the forging billet described in step (2) to room temperature, then polish the cracks on the surface of the forging billet, and place the polished billet under the condition that the initial forging temperature is 35°C above the β transformation point of the ingot Repeat upsetting and elongation forging twice, the final forging temperature is 890°C, and the cumulative deformation of forging is 80%;

[0039] (4) Air-cool the forged billet after repeatedly upsetting and elongating in step (3) to room temperature, t...

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Abstract

The invention discloses a method for producing a TC25 two-phase titanium alloy rod material with large specification. The method comprises the following steps of: firstly, cutting off a riser and an ingot bottom of a TC25 two-phase titanium alloy cast ingot to remove cast ingot skin gas holes; and then breaking down and forging the cast ingot subjected to skin gas hole removal by using an oil press or a water press two times so as to obtain a forged blank; next, upsetting the forged blank again and again and carrying out extension forging on the upset forged blank so as to obtain a blank; and finally, chamfering, rounding and forging the blank again and again, and cooling the blank with air to the room temperature so as to obtain the large-specification TC25 two-phase titanium alloy rod material with diameter phi of not less than 200 mm. The method for producing the TC25 two-phase titanium alloy rod material with large specification, disclosed by the invention, has the advantages of simple process, no need of special equipment, low machining cost, no cracking in the production process and easiness for realizing industrial production. The TC25 two-phase titanium alloy rod material product with large specification, manufactured by using the method disclosed by the invention, has the advantages of fewer interior defects, high safety and good product stability; compared with the prior art, the method disclosed by the invention has the advantage of increasing the product yield by at least 15 percents; and the manufactured rod material can be used as gas compressors of aircraft engines and other parts.

Description

technical field [0001] The invention belongs to the technical field of preparation of titanium alloy rods, and in particular relates to a method for preparing large-scale rods of TC25 two-phase titanium alloys. Background technique [0002] With the development of industrial technologies such as aviation, aerospace and shipbuilding, the requirements for large-scale bars of heat-strength TC25 two-phase titanium alloys are increasing, and the blanking and subsequent forging processes are the key to the successful preparation of large-scale bars of TC25 two-phase titanium alloys. key. At present, it is very difficult to produce through ordinary forging processing methods. The main disadvantages are that there are often defects such as cracks and internal cracks in material processing, product performance indicators are unstable, and the yield is low. Therefore, ordinary forging methods are no longer suitable for large specifications. (Diameter Φ≥200mm) Preparation of TC25 two-...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 黄张洪曲恒磊舒滢邓超吴华李维杨建朝
Owner WESTERN TITANIUM TECH
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