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Heating technology for refining TiAl alloy ingot microscopic texture

A technology for microstructure and alloy ingot casting, applied in the field of metal materials, can solve the problems of ingot cracking, uneven deformation structure, and inability to effectively eliminate microstructure casting defects.

Inactive Publication Date: 2006-03-29
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that cyclic heat treatment or double-temperature heat treatment cannot effectively eliminate casting defects such as dendrites, looseness, and cavities in the microstructure, and solve the uneven deformed structure caused by high-temperature forging such as isothermal forging and sheath forging (There is a deformation dead zone), which leads to poor performance stability and prone to spindle cracking

Method used

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  • Heating technology for refining TiAl alloy ingot microscopic texture

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Embodiment Construction

[0014] The TiAl alloy ingots that have been poured or solidified or pulled are subjected to salt bath quenching + aging treatment, and subsequent high-temperature forging deformation. The specific implementation methods are as follows:

[0015] (1) Heating the TiAl alloy ingot to T a The temperature is about 10°C to 15°C above the temperature, and the temperature is kept for a certain period of time. The length of this holding time is related to the thickness of the ingot, and the holding time is determined at 1 mm / min. For example, for a cylindrical ingot of 100 mm, the holding time is 50 minutes. Generally, the heat preservation time is preferably no more than 60 minutes.

[0016] (2) Quickly quench the above-mentioned ingot into the salt bath tank, and the time for the ingot to be transferred from the heating furnace to the salt bath tank is 5 to 10 seconds, so as to meet the requirement that the cooling rate of the subsequent salt bath quenching is greater than 100° C. / s...

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Abstract

A heat treating technology for fining microscopic structure of cast TiAl alloy ingot containing A (45-48 at%) and Nb (6-8 at%) includes such steps as quenching in salt bath plus ageing one or more times, and high-temp forging.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a thermal processing process for refining the microstructure of TiAl alloy ingots. Background technique [0002] TiAl alloy is a new type of high-temperature structural material, which has the advantages of low density and good high-temperature performance. It is considered to be one of the structural materials for next-generation aero-engines with great competitive potential. Compared with the current most mature aero-engine material - nickel-based superalloy, the density of TiAl alloy is only 3.7-3.9g / cm 3 , less than the density of nickel-based superalloy (7.9 ~ 9.5g / cm 3 ), which is self-evident for aero-engine components, and the creep limit of TiAl alloy is 750°C to 950°C, and the oxidation resistance limit is 800°C to 950°C, which is close to that of nickel-based alloys. The creep limit of superalloy is 800℃~1090℃ and the oxidation resistance limit is 870℃~1090℃. However,...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 宋西平张蓓王艳丽陈国良
Owner UNIV OF SCI & TECH BEIJING
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