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Forging method of Ti55 titanium alloy large-size bar

A large-scale, titanium alloy technology, applied in the field of titanium alloy material processing, can solve the problems of low yield, difficulty in forging deformation processing, easy cracking, etc., achieve the effects of small strength anisotropic difference, reduce blank loss, and reduce surface cracking

Active Publication Date: 2018-03-23
湖南湘投金天钛业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since Ti55 titanium alloy has a high degree of alloying and is mainly α-phase at room temperature, its deformation resistance is greater than that of traditional two-phase alloys such as TC4, TC11, etc., its process plasticity is obviously lower than TC4, TC11; and the alloy contains two kinds of weak β-stabilizing elements Nb and Ta with low content, and the temperature range in the (α+β) two-phase region is very small, and with the The temperature drops and the deformation resistance increases rapidly, which makes the forging deformation of the alloy bar, especially the forging deformation processing in the (α+β) two-phase region, more difficult. Not only is it easy to crack during the forging process, the amount of blank grinding Large, low yield, and poor forgeability of large-scale bars, it is difficult to obtain a uniform structure and properties that meet the standard requirements

Method used

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  • Forging method of Ti55 titanium alloy large-size bar
  • Forging method of Ti55 titanium alloy large-size bar
  • Forging method of Ti55 titanium alloy large-size bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 (Φ400㎜ specification bar)

[0026] Step 1, blank forging:

[0027] Select a Ti55 ingot with a specification of Φ780 and about 1.75 tons. The β phase transition temperature is 1000°C, put it into a heating furnace with a temperature of 800°C, preheat it for 1-2 hours, and slowly raise the temperature to 1150°C for 4-6 hours. Fire forging with two upsetting and two drawing forging to a square billet □ 580mm, the deformation of upsetting and drawing is controlled at 40~45%, after forging, it is air-cooled and the cracks are cleaned;

[0028] Step 2, intermediate forging:

[0029] Step 2.1. Put the forged billet completed in step 1 into a heating furnace with a temperature of 800°C, preheat for 2-4 hours, slowly raise the temperature to 1080°C and keep it for 4-6 hours, then carry out 2 times of upsetting and drawing forging, each time of 2 times Upsetting and two-drawing forging to square billet □ 580mm, the deformation of single-fire upsetting and drawing is c...

Embodiment 2

[0040] Example 2 (Φ300㎜ specification bar)

[0041] Step 1, blank forging:

[0042] Select Φ680 specifications, about 1.5 tons of Ti55 ingot, β transformation temperature is 1000 ℃, put it into a heating furnace with a temperature of 800 ℃, preheat for 1-2 hours, slowly raise the temperature to 1150 ℃ and keep it for 4-6 hours, then carry out two headings Two-drawing forging to a square billet □560mm, the amount of upsetting and drawing deformation is controlled at 40~45%, air-cooled after forging, and the cracks are cleaned;

[0043] Step 2, intermediate forging:

[0044] Step 2.1. Put the forged billet completed in step 1 into a heating furnace with a temperature of 800°C, preheat for 2-4 hours, slowly raise the temperature to 1080°C and keep it for 4-6 hours, then carry out 2 times of upsetting and drawing forging, each time of 2 times Upsetting and two-drawing forging to square billet □ 560mm, single-shot upsetting and drawing deformation is controlled at 38~42%, air-coo...

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Abstract

The invention discloses a forging method of a Ti55 titanium alloy large-size bar. The forging method comprises the steps of billet forging, intermediate forging and finished product forging. Accordingto the forging method, on the basis of a traditional single-phase area and two-phase area upsetting-drawing deformation process, a high-low-high-low alternate forging process is adopted for carryingout forging deformation of a billet, so that original beta grains are remarkably refined, and forging penetration of the large-size bar is improved; and the Ti55 titanium alloy large-size bar is obtained, wherein the core and the side of the Ti55 titanium alloy large-size bar are each of a thin and uniform equiaxed structure, the strength anisotropy of the Ti55 titanium alloy large-size bar is small, and the size of the Ti55 titanium alloy large-size bar is phi 300 mm-phi 450 mm or above.

Description

technical field [0001] The invention relates to the technical field of titanium alloy material processing, in particular to a forging method for Ti55 titanium alloy rods with a diameter of Φ300 to Φ450 mm, so as to obtain titanium alloy rods with uniform structure and properties. Background technique [0002] Ti55 titanium alloy belongs to nearly α-type titanium alloy. It is a high-temperature titanium alloy material. The long-term use temperature can reach 550°C, and it has good thermal strength and thermal stability. With the improvement of the thrust-to-weight ratio of aero-engines, the working conditions of the compressor are more complex and harsh. While relying on novel structures such as integral blisks and integral blade rings, they also rely more and more on high specific strength and low density. And advanced materials with strong high temperature resistance, high-temperature titanium alloys just meet this requirement, replacing steel or nickel-based superalloys, u...

Claims

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Application Information

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IPC IPC(8): B21J5/00C22F1/18
CPCB21J5/002C22F1/183
Inventor 彭晖黄德超陈艳朱雪峰李松强
Owner 湖南湘投金天钛业科技股份有限公司
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