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TiAl alloy and preparation method thereof

An alloy and intermediate alloy technology, applied in the field of TiAl alloy and its preparation, can solve the problems of increased manufacturing cost, poor comprehensive mechanical properties, inherent brittleness of TiAl alloy and difficulty in use, etc., and achieves good plasticity and good high temperature creep resistance. The effect of variable performance and excellent hot workability

Inactive Publication Date: 2019-08-02
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the intrinsic brittleness of TiAl alloys brings great difficulties to its processing and use
On the one hand, it leads to poor comprehensive mechanical properties, and on the other hand, it leads to a substantial increase in its manufacturing cost

Method used

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  • TiAl alloy and preparation method thereof
  • TiAl alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation process of the present embodiment TiAl alloy is as follows:

[0022] Take the raw material sponge titanium, aluminum beans, AlV master alloy, AlTiB, carbon powder, and prepare it by vacuum consumable melting + induction suspension melting The actual composition of the TiAl alloy ingot is Ti-41.5Al-8.0V-0.1B-0.1C (at.%), which contains unavoidable impurities.

[0023] The ingot is subjected to hot isostatic pressing to eliminate keyhole shrinkage, and then a test rod is cut from the ingot.

[0024] Put each test rod into a resistance furnace and raise the temperature to 1320°C. The heating rate of the resistance furnace is 10°C / min. When the temperature reaches 1320°C, it is kept for 40 minutes, and then the test rod is oil-quenched to room temperature.

[0025] Put the quenched sample into the resistance furnace and raise the temperature to 1000°C. The heating rate of the resistance furnace is 10°C / min. When the temperature reaches 1000°C, keep it warm...

Embodiment 2

[0029] The preparation process of the present embodiment TiAl alloy is as follows:

[0030] Using the same ingot as in Example 1, cut the test rod, put it into the resistance furnace and raise the temperature to 1320 ° C, the heating rate of the resistance furnace is 10 ° C / min, when the temperature reaches 1320 ° C, keep it warm for 1 hour, and then oil quench the test rod to room temperature.

[0031] Put the quenched sample into the electric resistance furnace and raise the temperature to 850°C. The heating rate of the electric resistance furnace is 10°C / min.

[0032] figure 2 It is the microstructure of TiAl alloy 1300℃ / 0.5h oil quenching, followed by 850℃ / 1500min tempering. It can be observed that the quenched martensite transforms into fine α 2 / γ lamellar structure, and ultrafine γ grains are precipitated in the residual β phase.

[0033] The mechanical properties of the tissue were tested. The test results show that the tensile strength of the alloy reaches abov...

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Abstract

The invention belongs to the technical field of alloy material thermal treatment and particularly relates to TiAl alloy and a preparation method thereof. The TiAl alloy comprises the following components in atom percentage: 38.0-42.0 at.% of Al, 5.0-10.0 at.% of V, 0.1-0.5 at.% of B, 0.1-0.5 at.% of C and the balance of Ti and unavoidable impurity elements. According to TiAl alloy, high hardenability is obtained through increasing V content and reducing Al content, so that the TiAl alloy can generate martensite transformation at a medium cooling rate from a beta phase area to optimize the usability and processability of TiAl alloy through adjusting the tempering technology.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of alloy materials, and in particular relates to a TiAl alloy and a preparation method thereof. Background technique [0002] TiAl-based intermetallic compounds have a series of excellent properties such as low density, high specific strength / specific stiffness, good oxidation resistance and creep resistance. lightweight heat-resistant structural material. The current TiAl alloys can be divided into two categories, one is the peritectic solidified TiAl alloy, and its phase transformation path is roughly L→L+β→α→α 2 + gamma. The other type is β-solidified TiAl alloy, and its phase transformation path is roughly L→L+β→β→β+α→α→α 2 + gamma. The latter has become a current research hotspot because of its higher operating temperature range. [0003] However, the intrinsic brittleness of TiAl alloys brings great difficulties to its processing and use. On the one hand, it leads to poor compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22F1/183
Inventor 程亮陈逸张帅今张云龙卢雅琳
Owner JIANGSU UNIV OF TECH
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