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Cogging method for Ti2AlNb-based alloy ingot

A technology of base alloy and ingot casting, which is applied in the field of billet opening of Ti2AlNb base alloy ingot, can solve the problems of poor forgeability of the alloy, forging cracking, etc., and achieve the effects of low steady-state deformation resistance, uniform structure, and good process plasticity

Active Publication Date: 2014-11-19
GUIZHOU ANDA AVIATION FORGING +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] Ti 2 Although the AlNb-based alloy has many advantages, it has a fatal weakness, that is, the forgeability of the alloy is very poor, and it is very easy to cause forging cracks if it is not well controlled.

Method used

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specific Embodiment approach

[0011] Carry out the present invention Ti 2 The blanking method of AlNb-based alloy ingots needs to provide forging high-temperature heating furnaces, presses, manipulators and other equipment. The specific implementation is as follows:

[0012] Provide Ti 2 AlNb-based alloy ingot, its nominal chemical composition is: Ti-22Al-25Nb.

[0013] The blanking process steps of the alloy are as follows:

[0014] Ti 2 The AlNb-based alloy ingot is made into a φ290×280mm rod by a wire cutting machine; aluminum silicate fiber is used to 2 After the AlNb-based alloy ingot is sheathed, it is placed in a high-temperature heating furnace and heated to 1150°C for 80 minutes, then placed on a press, and heated at 0.01S -1 Repeated upsetting and lengthening at a certain strain rate: the first fire upsetting to 350mm, the second fire upsetting to 270mm, the third fire upsetting to 350mm, the fourth fire upsetting to 270mm, and the fifth fire upsetting to 350mm , air-cooled; return to the f...

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Abstract

The invention discloses a cogging method for a Ti2AlNb-based alloy ingot. The cogging method comprises the steps that the Ti2AlNb-based alloy ingot is loaded on a wire cutting machine and manufactured into a Phi290*280mm bar; the Ti2AlNb-based alloy ingot is sleeved with alumina silicate fibers, placed into a high-temperature heating furnace to be heated to 1150 DEG C and then placed on a press after the temperature is kept for 80 minutes, and repeated upsetting and drawing are performed at the strain rate of 0.01S-1; the ingot is drawn out to 350mm after first fire, upset to 350mm after second fire, drawn out to 350mm after third fire, upset to 270mm after fourth fire and drawn out to 350mm after fifth fire, and air cooling is performed. The ingot is returned to the furnace to be heated to 1150 DEG C and the temperature is kept for 40 minutes for each fire, and the final forging temperature of each fire is guaranteed to be equal to or larger than 1050 DEG C. According to the method, the steady state deformation resistance of the Ti2AlNb-based alloy ingot is reduced in a fully dynamic recrystallization state, the technological plasticity is improved, cracking is prevented, a cast structure is smashed completely, and a uniform and dense forge structure is obtained.

Description

technical field [0001] The invention relates to a billet opening method for casting ingots, in particular to Ti 2 The invention discloses a blanking method of AlNb-based alloy ingot. Background technique [0002] Ti 2 AlNb-based alloy is a new type of lightweight high-temperature structural material. It is an intermetallic compound composed of Ti, Al and Nb. This type of alloy is composed of two or three phases of O phase, B2 / β phase and α2 phase. Phase composite structure, with low density, high elastic modulus, high temperature strength, high fracture performance, high creep resistance, low thermal expansion performance, non-magnetic and good flame retardancy, etc. Compared with high-temperature titanium alloys, it has higher The service temperature, creep resistance and high temperature strength, and its density and thermal expansion coefficient are significantly lower than nickel-based superalloys. It is the best choice to replace titanium alloys and superalloys in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06
Inventor 杨晋苏海张衡朱灵华邹善垚彭泉兴彭华栋张小林
Owner GUIZHOU ANDA AVIATION FORGING
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