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Short-time and high efficiency deforming TiAl alloy heat treatment method

A heat treatment method and heat treatment temperature technology, which is applied in the field of metal material preparation, can solve the problems of high heat treatment temperature, long heat treatment time, grain growth, etc., achieve broad engineering application prospects, avoid long-term heat preservation, and short treatment time.

Inactive Publication Date: 2017-03-15
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual heat treatment process, it is difficult to heat the surface and the core at the same time.
At the same time, due to solidification and segregation, the microstructure of TiAl alloy is not uniform. To obtain a full lamellar structure, a long period of high-temperature heat treatment must be carried out. Whole-lamellar tissue
It can be seen that the current heat treatment method not only requires high heat treatment temperature, but also takes a long time for heat treatment. The energy loss in the heat treatment process is large, and the surface oxidation of the sample is serious. On the one hand, it deteriorates the mechanical properties of the sample, and on the other hand, it improves The difficulty of subsequent processing

Method used

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  • Short-time and high efficiency deforming TiAl alloy heat treatment method

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Effect test

Embodiment 1

[0017] Electric pulse frequency 200Hz, pulse width 60μs, peak current density 350A mm -2 , the treatment temperature reaches 900°C, and the holding time is 40s. After treatment, the microstructure of the plate has little change, which is a two-state structure in the rolled state, and the hardness is slightly lower than that in the hot-rolled state, reaching 399HV.

Embodiment 2

[0019] Electric pulse frequency 300Hz, pulse width 60μs, peak current density 380A mm -2 , the treatment temperature reaches 1000°C, and the holding time is 40s. After treatment, the microstructure of the plate has little change, and it is a two-state structure in the rolling state, and the hardness reaches 401HV.

Embodiment 3

[0021] Electric pulse frequency 200Hz, pulse width 60μs, peak current density 400A mm -2 , the treatment temperature reaches 1150°C, and the holding time is 40s. After treatment, the microstructure of the plate changed significantly, and the structure was nearly γ structure, accompanied by a small amount of lamellar clusters, the volume fraction increased, and the hardness reached 412HV.

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Abstract

Belonging to the technical field of metal material preparation, the invention relates to a short-time and high efficiency deforming TiAl alloy heat treatment method. High energy electropulsing is applied to deforming TiAl alloy to conduct heat treatment so as to improve the microstructure and enhance mechanical properties. The heat treatment temperature is controlled by controlling the electropulsing parameters. The applied high energy electropulsing has frequency of 60-500Hz, a pulse width of 10-300micros, a peak current density of 20-500A.mm<-2>, and a highest temperature up to 1330DEG C, can meet the heat treatment temperature requirement of four typical TiAl alloy microstructures, also makes the deforming TiAl alloy microstructure achieve uniform and fine effects, and can improve the plasticity and strength. The method for treatment of deforming TiAl alloy can greatly shorten the heat treatment time and improve the energy utilization efficiency, thus having wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a short-time and high-efficiency deformed TiAl alloy heat treatment method. [0002] technical background [0003] The density of TiAl alloy is only half of that of Ni-based superalloys. It has excellent high-temperature specific stiffness, specific strength, and good high-temperature oxidation resistance. It can replace high-temperature alloys in the temperature range of 600-900°C to make aerospace structural parts and ground power system rotation. Or reciprocating structural parts, which can greatly improve the thrust-to-weight ratio and fuel efficiency, and have broad application prospects in aviation, aerospace and vehicle engineering. TiAl alloy components are mainly prepared by casting and deformation methods. The mechanical properties of TiAl alloy are closely related to its microstructure, and the fine full-lamellar structure is the current development di...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22F1/04
CPCC22F1/183C22F1/04
Inventor 梁永锋林均品冀新波叶丰沈正章温识博张来启郝国建
Owner UNIV OF SCI & TECH BEIJING
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