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Heat Treatment Processes for Obtaining Tri-state and Bi-state Structures in Tial Alloys

A heat treatment furnace and organization technology, applied in the field of heat treatment technology, can solve the problems of high room temperature brittleness and difficult thermal processing of titanium aluminum alloy, and achieve the effects of large-scale industrialization, easy operation and simple process.

Active Publication Date: 2022-04-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is very beneficial to solve the problems of high room temperature brittleness of titanium aluminum alloy and difficulty in hot working

Method used

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  • Heat Treatment Processes for Obtaining Tri-state and Bi-state Structures in Tial Alloys
  • Heat Treatment Processes for Obtaining Tri-state and Bi-state Structures in Tial Alloys
  • Heat Treatment Processes for Obtaining Tri-state and Bi-state Structures in Tial Alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: First, cut a cylindrical heat treatment sample of Φ10*70mm from the forged TNM forging cake (forging temperature is 1170°C, engineering strain is 74%, isothermal forging is performed three times). After characterization by backscattered electrons on a scanning electron microscope, it was found that its microstructure is mainly composed of equiaxed γ, α 2 and a small amount of β 0 Phase grains and a very small amount of residual lamellar composition, such as figure 1 shown.

[0032] Step 2: Place the cylindrical heat treatment sample obtained in Step 1 in a heat treatment furnace with precise temperature control and good sealing (for example, a 1600°C tube furnace); heat up to 1280°C with the furnace, keep it warm for 1 hour, and then air cool. When the furnace temperature drops to 1050°C, put the sample into the heat treatment furnace, keep it warm for 3 hours, and then cool down to room temperature with the furnace. This step obtains a two-state tissue, such...

Embodiment 2

[0035] Step one, its operation method is the same as step one in embodiment one.

[0036] Step 2: Place the cylindrical heat-treated sample obtained in Step 1 in a heat-treatment furnace (such as a 1600° C. tube furnace) with precise temperature control and good sealing. Heat up to 1300°C with the furnace, keep warm for 1 hour and then air cool. When the furnace temperature drops to 1050°C, put the sample into the heat treatment furnace, keep it warm for 2 hours, and then cool down to room temperature with the furnace. This step yields bimorphic tissue.

[0037] Step 3: Place the cylindrical heat-treated sample obtained in Step 1 in a heat-treatment furnace (such as a 1600° C. tube furnace) with precise temperature control and good sealing. Heat up to 1300°C with the furnace, keep warm for 1 hour and then air cool. When the furnace temperature drops to 1000°C, put the sample into the heat treatment furnace, keep it warm for 2 hours, and then cool down to room temperature wi...

Embodiment 3

[0039] Step one, its operation method is the same as step one in embodiment one.

[0040] Step 2: Place the cylindrical heat-treated sample obtained in Step 1 in a heat-treatment furnace (such as a 1600° C. tube furnace) with precise temperature control and good sealing. As the furnace heats up to 1250 ° C, oil quenching after 1 hour of heat preservation. When the furnace temperature drops to 1050°C, put the sample into the heat treatment furnace, keep it warm for 6 hours, and then cool down to room temperature with the furnace. This step yields bimorphic tissue.

[0041] Step 3: Place the cylindrical heat-treated sample obtained in Step 1 in a heat-treatment furnace (such as a 1600° C. tube furnace) with precise temperature control and good sealing. As the furnace heats up to 1250 ° C, oil quenching after 1 hour of heat preservation. When the furnace temperature drops to 1000°C, put the sample into the heat treatment furnace, keep it warm for 6 hours, and then cool down to r...

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Abstract

The present application discloses a heat treatment process for obtaining a triple-state structure and a double-state structure in a TiAl alloy, comprising the following steps: putting a TNM alloy forging sample into a heat treatment furnace for solution treatment, wherein the solution treatment process It is: the sample is heated up to the temperature range of 1250-1300°C with the furnace, and after holding the heat for 1 hour, it is removed from the heat treatment furnace and quickly cooled to room temperature; In the heat treatment furnace at ℃, the holding time is 2-6 hours, and the double-state structure or triple-state structure can be formed in the sample as the furnace cools to room temperature. Through a simple two-step heat treatment process, the present application has successfully regulated a new type of three-state structure and two-state structure in the forged TNM alloy, which has comprehensively improved the room temperature comprehensive properties of the TNM alloy and greatly improved the high-temperature plasticity. The process is simple, the operation is easy, and large-scale industrialization can be realized in engineering.

Description

technical field [0001] The application belongs to the technical field of microstructure control of titanium-aluminum alloys, and in particular relates to a heat treatment process for obtaining a triple-state structure and a double-state structure in a TiAl alloy. Background technique [0002] TNM is a classic third-generation titanium-aluminum alloy with a composition range of Ti-(42-45)Al-(3-5)Nb-(0.1-2)Mo-(0.1-0.2)B. Compared with the second-generation titanium-aluminum alloy, its service temperature can reach 750°C. After three times of forging, this alloy has been successfully used in the blades of aero-engines. According to the phase diagram of the Ti-Al system, four kinds of microstructures can be obtained by thermal processing or heat treatment in different phase temperature ranges, namely near γ microstructure and bimodal microstructure (by equiaxed γ+α 2 / γ lamella group composition, another two-state structure invented in this patent), near lamellar structure (<...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/04
CPCC22F1/183C22F1/04
Inventor 唐斌郑国明李金山王军王毅寇宏超陈彪樊江昆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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