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Heat treatment technology for improving brittleness of beta-phase solidification high Nb-TiAl alloy in water vapor environment

An alloy and environmental technology, applied in the field of intermetallic compounds, achieves the effects of simple operation, increased practical application and operability, and low cost

Inactive Publication Date: 2017-05-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, the problem of how to improve the brittleness of the most promising β-solidified high Nb-TiAl alloy in a water vapor environment through heat treatment has not yet been resolved.

Method used

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  • Heat treatment technology for improving brittleness of beta-phase solidification high Nb-TiAl alloy in water vapor environment
  • Heat treatment technology for improving brittleness of beta-phase solidification high Nb-TiAl alloy in water vapor environment
  • Heat treatment technology for improving brittleness of beta-phase solidification high Nb-TiAl alloy in water vapor environment

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Embodiment 1

[0029] This embodiment is a heat treatment process for improving brittleness resistance in a water vapor environment. The specific steps are:

[0030] Step 1, prepare the sample. Samples were taken from ingots of β-solidified high Nb-TiAl alloys of Ti-45Al-8.5Nb-(W,B,Y) obtained by electron beam melting. The microstructure of the β-solidified high Nb-TiAl alloy ingot is as follows figure 1 as shown in a. The size of the β-solidified high Nb-TiAl alloy sample is 100 × 30 × 30 mm. After ultrasonic cleaning and drying, the sample is placed in a heat treatment furnace, vacuumized and protected by argon gas. The vacuum degree is 5×10 -4 Pa.

[0031] Step 2, heat treatment. The sample was put into a box-type high-temperature heat treatment furnace, and the temperature was raised to 1240 °C in a stepwise manner with the furnace. Heating rate: the heating rate from room temperature to 900°C is 10°C / min; the heating rate above 900°C is 5°C / min. Then keep the sample heated to 1...

Embodiment 2

[0034] Step 1, prepare the sample. Samples were taken from ingots of β-solidified high Nb-TiAl alloys of Ti-45Al-8.5Nb-(W,B,Y) obtained by electron beam melting. The microstructure of the β-solidified high Nb-TiAl alloy ingot is as follows figure 1 as shown in a. The size of the β-solidified high Nb-TiAl alloy sample is 100 × 30 × 30 mm. After ultrasonic cleaning and drying, the sample is placed in a heat treatment furnace, vacuumized and protected by argon gas. The vacuum degree is 1×10 -3 Pa.

[0035] Step 2, heat treatment. The sample was put into a box-type high-temperature heat treatment furnace, and the temperature was raised to 1220°C in a stepwise manner with the furnace. Heating rate: the heating rate from room temperature to 850°C is 8°C / min; the heating rate above 850°C is 4°C / min. Then keep the sample heated to 1220°C for 6 hours, and cool to room temperature with the furnace.

[0036] Experimental results such as figure 1 as shown in c. pass figure 1 ...

Embodiment 3

[0038] Step 1, prepare the sample. Samples were taken from ingots of β-solidified high Nb-TiAl alloys of Ti-45Al-8.5Nb-(W,B,Y) obtained by electron beam melting. The microstructure of the β-solidified high Nb-TiAl alloy ingot is as follows figure 1 as shown in a. The size of the β-solidified high Nb-TiAl alloy sample is 100 × 30 × 30 mm. After ultrasonic cleaning and drying, the sample is placed in a heat treatment furnace, vacuumized and protected by argon gas. The vacuum degree is 1×10 -4 Pa.

[0039] Step 2, heat treatment. The sample was put into a box-type high-temperature heat treatment furnace, and the temperature was raised to 1260 °C in a stepwise manner with the furnace. Heating rate: The heating rate from room temperature to 950°C is 12°C / min; the heating rate above 950°C is 6°C / min. Then keep the sample heated to 1260°C for 9 hours, and cool to room temperature with the furnace.

[0040] Experimental results such as figure 1 shown in d. pass figure 1 D...

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Abstract

The invention provides a heat treatment technology for improving the brittleness of beta-phase solidification high Nb-TiAl alloy in a water vapor environment. By reasonably controlling the heat treatment temperature of the beta-phase solidification high Nb-TiAl alloy, the brittleness capability of the beta-phase solidification high Nb-TiAl alloy system for resisting the water vapor environment is obviously improved. Specifically, the elongation at break is reduced to 6.56% from 12.46% in the prior art, and the breaking strength is reduced to 2.68% from 4.11% in the prior art. The technical process is simple, the requirements on equipment are low, the cost is low, and the actual applicability and operability of the technology are increased.

Description

technical field [0001] The invention belongs to the technical field of intermetallic compounds in metal materials, and in particular provides a heat treatment method for improving the brittleness of the β-solidified high Nb-TiAl alloy structure against water vapor environment, and further realizing the improvement of the stability of mechanical properties. Background technique [0002] Because of its excellent high-temperature mechanical properties, low density, excellent oxidation resistance and flame retardancy, TiAl intermetallic compounds have broad application prospects in aerospace, nuclear energy, navigation and other fields, and are considered to be the most promising. The potential of a new generation of lightweight high-temperature structural materials. In view of the fact that the performance of TiAl-based alloys strongly depends on the alloy composition, for a long period of time, scholars have focused on the research on TiAl-based alloys to control the microstru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F1/16C22F1/02
CPCC22F1/183C22F1/02C22F1/16
Inventor 张铁邦李金山吴泽恩寇宏超胡锐王军唐斌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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