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1100 MPa level thermal strength titanium alloy and preparation method thereof

A technology of titanium alloy and voltage control, applied in the field of titanium alloy, can solve the problems of restricting the proportion of titanium alloy used in aero-engines, difficult to meet design and manufacturing requirements, etc., and achieve the effects of easy operation, simple preparation method and excellent performance.

Inactive Publication Date: 2013-02-06
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, with the development of high thrust ratio of the engine, it is required that the room temperature tensile strength σb≥1100MPa and the 500℃ high temperature tensile strength σb≥780MPa of the heat-strength titanium alloy are required. The TC11 titanium alloy has been difficult to meet the design and manufacturing requirements, which limits the The use ratio of alloys in aero-engines urgently requires the development of new heat-strength titanium alloys

Method used

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  • 1100 MPa level thermal strength titanium alloy and preparation method thereof
  • 1100 MPa level thermal strength titanium alloy and preparation method thereof
  • 1100 MPa level thermal strength titanium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of 300 kg grade Ti-6.5Al-3.5Mo-2Nb-2Zr-0.25Si titanium alloy:

[0027] (1) Ingredients and electrode pressing:

[0028] According to the nominal composition (that is, 6.5% Al; 3.5Mo; 2Nb; 2Zr; 0.25Si; the rest is Ti), select first-class small particle sponge titanium, Al-Mo master alloy, Ti-Nb master alloy, Ti-Si master alloy, Pure metal Zr, mixed with 300Kg, is pressed into a bulk electrode with a single weight of 10Kg by a press.

[0029] (2) Electrode preparation:

[0030] Argon shielded plasma welding machine is used to weld the pressed electrode blocks into long strip electrodes.

[0031] (3) Prepare primary ingot

[0032] The electrode prepared in the previous step was used as the consumable electrode to melt in a vacuum consumable electric arc furnace to obtain a primary ingot, the melting current was 5KA, and the melting voltage was controlled at 26V.

[0033] (4) Preparation of secondary ingot

[0034] The primary ingot was inverted and used as...

Embodiment 2

[0048] Preparation of 2000 kg grade Ti-6.5Al-3.5Mo-2Nb-2Zr-0.25Si titanium alloy:

[0049] (1) Ingredients and electrode pressing:

[0050] According to the nominal composition (that is, 6.5% Al; 3.5% Mo; 2% Nb; 2% Zr; 0.25% Si; the rest is Ti), select first-class small particle sponge titanium, Al-Mo master alloy, Al-Nb master alloy, Ti-Si master alloy, pure metal Zr, mixing 2000Kg (divided into 20 times), pressed with a press to form a block electrode with a single weight of 50Kg.

[0051] (2) Electrode preparation:

[0052] Argon shielded plasma welding machine is used to weld the pressed electrode blocks into long strip electrodes.

[0053] (3) Prepare primary ingot

[0054] Use the strip-shaped electrode prepared in the previous step as the consumable electrode to melt in a vacuum consumable electric arc furnace to obtain a primary ingot, the melting current is 6KA, and the melting voltage is controlled at 35V.

[0055] (4) Preparation of secondary ingot

[0056] The...

Embodiment 3

[0070] In this embodiment, the composition of the 1100MPa grade heat-strength titanium alloy is:

[0071] Al: 5.8%; Mo: 2.8%; Nb: 1.6%; Zr: 1.6%; Si: 0.20%;

[0072] 1) First, mix the materials according to the above component contents, and use a press and a mold to press into an electrode block.

[0073] 2) Vacuum plasma welding, argon shielded plasma welding or vacuum electron beam welding is used to assemble and weld the pressed electrode blocks into strip-shaped electrodes.

[0074] 3) Using the strip electrode prepared in step 2) as a consumable electrode to melt in a vacuum consumable electric arc furnace to obtain a primary ingot; the melting current is 12KA, and the melting voltage is controlled at 26V.

[0075] 4) Invert the primary ingot and use it as a consumable electrode for secondary melting in a vacuum consumable electric arc furnace to obtain a secondary ingot; the melting current is 15KA, and the melting voltage is controlled at 26V.

[0076] 5) Invert the s...

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Abstract

The invention discloses a 1100 MPa level thermal strength titanium alloy and a preparation method thereof. The alloy comprises the following components by weight percent: 5.8-7.2% of Al, 2.8-3.8% of Mo, 1.6-2.5% of Nb, 1.6-2.5% of Zr, 0.20-0.30% of Si and the balance of Ti. The preparation method comprises the following steps: dosing, performing electrode pressing and electrode preparation, preparing primary ingots, preparing secondary ingots, preparing cast ingots, cooling, discharging, and the like. The performances such as room temperature strength and high temperature strength of the titanium alloy parts prepared from the titanium alloy disclosed by the invention are obviously higher than those of titanium alloy parts prepared from the existing TC11 thermal strength titanium alloy; and the performances such as plasticity and impact of the titanium alloy parts and the same performances of the TC11 thermal strength titanium alloy are in the same order of magnitude. In addition, the preparation method of the titanium alloy with excellent performances is simple and is easy to operate while the excellent performances are ensured.

Description

technical field [0001] The invention belongs to the field of titanium alloy manufacture, and relates to a titanium alloy, in particular to a 1100MPa heat-strength titanium alloy and a preparation method thereof. Background technique [0002] As a light metal alloy material, titanium alloy has a series of advantages such as high specific strength, high specific modulus, high toughness, and corrosion resistance. It is widely used in the production and manufacture of aircraft body structural parts and aeroengines. With the development of design technology, the demand for high-performance titanium alloy is also increasing. The amount of titanium alloy used in aerospace vehicles has become one of the important symbols to measure its advanced level. [0003] Heat-strength titanium alloys are mainly used in aero-engines, which have strict requirements on room temperature and high temperature strength. At present, the heat-strength titanium alloy widely used in my country is mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/02
Inventor 张利军周中波白钰刘娣王幸运田军强薛祥义常辉
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD