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A kind of high temperature titanium alloy and preparation method thereof

A high-temperature titanium alloy and intermediate alloy technology, applied in the field of high-temperature titanium alloy and its preparation, can solve the problems of reducing the high-temperature creep and durability properties of materials, high-temperature creep properties, poor durability properties, and decreasing thermal stability of alloys, etc. The effect of improving high temperature durability and creep performance, good welding performance and excellent high temperature tensile properties

Inactive Publication Date: 2016-09-14
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) Disadvantages: The thermal stability of Sn-containing high-temperature titanium alloy materials will decrease to varying degrees after long-term use. The reason is that adding more Al and Sn to the alloy will lead to the precipitation of a large amount of Ti 3 X (X=Al, Sn) Brittle phase, which reduces the thermal stability of the alloy
But the main disadvantages of this material are: 1) The Mo equivalent ([Mo] when =%Mo+%Nb / 3.6) of this material is above 1.7, although the room temperature and high temperature strength of this material are very high, but the high temperature creep of this material Poor performance and durability, not high-temperature titanium alloys in the true sense; the Mo equivalent of high-temperature titanium alloys that can be maturely applied at a temperature of 600 °C at home and abroad are basically controlled at around 1.0 or less than 1.0, and excessively high Mo equivalents will reduce the material High temperature creep and durability properties

Method used

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  • A kind of high temperature titanium alloy and preparation method thereof
  • A kind of high temperature titanium alloy and preparation method thereof
  • A kind of high temperature titanium alloy and preparation method thereof

Examples

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Comparison scheme
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preparation example Construction

[0052] A preparation method of a high-temperature titanium alloy, the preparation method specifically comprising the following steps:

[0053] 1. Preparation materials:

[0054] Firstly, Ti is made of 0A--grade 1 sponge titanium, and the alloy elements Nb, Mo, and Si are added in the form of master alloy; Zr and C are added in the form of sponge Zr and carbon powder respectively; the Al part is brought in by the master alloy, and the insufficient part is added as pure Al ;

[0055] 2. Preparation of high temperature titanium alloy:

[0056] Continuing from the previous step, after the intermediate alloy and titanium sponge are batched and mixed, they are pressed into electrodes with a press, and then the electrode groups are welded together, and smelted 2 to 3 times in the smelting equipment. The smelting equipment is vacuum self-consumption arc furnace or vacuum induction furnace; alloy ingots are made, and the alloy ingots are vacuum poured into mechanical test bars throug...

Embodiment 1

[0076] The chemical content (wt%) of the high-temperature titanium alloy materials in Examples 1# to 7# is shown in the table below.

[0077] The chemical content (wt%) of embodiment 1#~7# high temperature titanium alloy material

[0078]

Al

Zr

Nb

Mo

Si

C

Example 1

6.3

4.0

1.6

0.6

0.4

0.10

Example 2

6.2

4.0

1.6

0.6

0.3

0.06

Example 3

6.6

3.9

1.7

0.6

0.3

0.08

Example 4

6.0

4.5

1.0

0.8

0.2

0.14

Example 5

6.6

3.5

2.0

0.4

0.7

0.06

Example 6

5.5

5.0

0.5

1.0

0.1

0.15

Example 7

7.0

2.0

2.5

0.2

0.8

0.03

[0079] The tensile properties at room temperature of the high-temperature titanium alloy materials of Examples 1# to 7# are shown in the table below.

[0080] Example 1#~7# Tensile properties at room temperature

[0081]

R P0.2 (MPa)

R m (MPa)

A（%）

...

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Abstract

The invention relates to a high temperature titanium alloy and a preparation method thereof. Sn element is not added into the alloy provided by the invention, and the tearing tendency in a casting process and the cracking tendency in a welding process that likely to be caused by the brittle phase Ti3Sn can be eliminated, so that the high temperature titanium alloy involved in the invention can have better casting performance, welding performance and product reliability. Nb and Si elements are added at the same time to form Nb-Si high-melting-point compound particles, thus enhancing the high temperature endurance and creep properties of the material. In addition, a certain amount of C element is almost dissolved in the material matrix in the form of solid solution after adding, thus improving the high temperature endurance, creep properties and the like of the material.

Description

【Technical field】 [0001] The invention relates to a titanium alloy and a preparation method thereof, in particular to a high-temperature titanium alloy and a preparation method thereof. 【Background technique】 [0002] It is known that high-temperature titanium alloys around the world are mainly developed around the application background of aero-engines, and are mainly used in aircraft engine discs, low-pressure turbine blades, rotors, drums and other parts. The product types are mainly forgings and plates. In view of the harsh requirements of the engine on the material, it is required to have good room temperature performance, high temperature strength, creep resistance, thermal stability, fatigue performance and fracture toughness; at the same time, considering that the products are mainly forgings and plates, the material is also required Has good cold and hot processing properties. [0003] The main application background of high-temperature titanium alloy materials is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03C22B9/20C22F1/18
CPCY02P10/25
Inventor 陈志强周洪强包淑娟李渤渤
Owner LUOYANG SUNRUI TI PRECISION CASTING
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