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Cast toughened Ti3Al intermetallic compound as well as preparation method and application thereof

A technology of intermetallic compounds and manufacturing methods, which is applied in the field of manufacturing new cast tough Ti3Al intermetallic compounds, can solve the problems of not meeting the weight reduction requirements of high thrust-to-weight ratio engines, high density, etc.

Inactive Publication Date: 2017-10-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the GH4169 alloy has a high density and cannot meet the weight reduction requirements of high thrust-to-weight ratio engines

Method used

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  • Cast toughened Ti3Al intermetallic compound as well as preparation method and application thereof
  • Cast toughened Ti3Al intermetallic compound as well as preparation method and application thereof
  • Cast toughened Ti3Al intermetallic compound as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 # ~4 #

[0046] Example 1 # ~4 # The ingredients are listed in Table 2. The smelting process of the ingot is a vacuum consumable smelting, a vacuum shell smelting, a vacuum suspension smelting, and then casting into a φ70mm casting rod in a steel mold. After the cast rod is solution heat treated, the sample is processed and the mechanical properties are tested. The heat treatment system adopted is: solid solution temperature 1020°C, solid solution time 1h, cooling rate 0.5°C / s. The microstructure of the sample under the scanning electron microscope can be seen image 3 , and the tensile results at room temperature are shown in Table 3.

[0047] Table 2: Example 1 # ~4 # alloy composition

[0048] Example

Alloy Nominal Composition (at.%)

Measured Al content (wt.%)

Measured O content (wt.%)

1 #

Ti-18.5Al-15Nb-1Mo

9.55

0.068

2 #

Ti-19.5Al-15Nb-1Mo

10.2

0.069

3 #

Ti-20.5Al-15Nb-1Mo

10....

Embodiment 5

[0053] Example 5 # ~6 #

[0054] Example 5 # The nominal composition is Ti-22Al-15Nb-0.5Mo (at.%), Example 6 # The nominal composition of Ti-22Al-15Nb-1Mo (at.%). The smelting process of the ingot is two vacuum consumable smelting, one vacuum suspension smelting, and then casting into a φ70mm casting rod in a steel mold. The cast rod is first processed by hot isostatic pressing (HIP): the hot isostatic pressing pressure is 130MPa, the temperature is 1020±20°C, the time is 3 hours, and it is cooled to below 300°C with the furnace. After hot isostatic pressing, the samples were subjected to different solution heat treatments and the mechanical properties were tested. The tests are shown in Tables 4 and 5.

[0055] Table 4: Example 5 # ~6 # Room temperature tensile properties

[0056]

[0057] Table 5: Example 5 # ~6 # Tensile properties at 600°C

[0058]

[0059] From the tensile properties in Tables 4 and 5, it can be seen that when the Mo content changes from ...

Embodiment 7

[0060] Example 7 # ~10 #

[0061] Example 7 # ~10 # The measured components are listed in Table 6. In the alloy ingredients, the gradient increasing O element is based on TiO 2 The preparation process of other alloys remains unchanged. The smelting process of the ingot is a vacuum consumable smelting, a vacuum shell smelting, a vacuum suspension smelting, and then casting into a φ70mm casting rod in a steel mold. After the cast rod is solution heat treated, the sample is processed and the mechanical properties are tested. The heat treatment system adopted is: solid solution temperature 1020°C, solid solution time 1h, cooling rate 0.5°C / s. The tensile results at room temperature are shown in Table 7.

[0062] Table 6: Example 7 # ~10 # alloy composition

[0063] Example

[0064] Table 7: Example 7 # ~10 # Room temperature tensile properties

[0065] Example

[0066] It can be seen from Table 7 that when the O content is between 0.068 and 0.15wt...

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Abstract

The invention belongs to the field of Ti-Al intermetallic compounds, and in particular relates to a cast toughened Ti3Al intermetallic compound as well as a preparation method and application thereof. The cast toughened Ti3Al intermetallic compound comprises constitution factors such as alloy components, smelting, precise casting and thermal treatment. The alloy components comprise 10.2-11.8 percent by weight of Al, 26.0-29.0 percent by weight of Nb, 1.0-3.0 percent by weight of Mo, and the balance of Ti and inevitable impurity elements, wherein the inevitable impurity elements comprise Fe, Si, O, N and H; Fe is less than or equal to 0.3%; Si is less than or equal to 0.3%, O is less than or equal to 0.15%; N is less than or equal to 0.04%; and H is less than or equal to 0.01%. Therefore, with the combination of the component optimization process and the thermal treatment processes, different matches between tensile strength and plasticity and between fatigue strength and thermal stability can be achieved, and the compound can be also used for manufacturing precise cast parts such as high-temperature parts of aero-engines, and can be used for a long time at 600-700 DEG C; and the alloy can be also used for manufacturing high-temperature resistant structural parts of aerospace crafts, and can be used for a short time at 650-750 DEG C.

Description

technical field [0001] The invention belongs to the field of Ti-Al intermetallic compounds, and specifically relates to a new type of cast tough Ti which can be used for a long time (≥500 hours) at 600°C to 700°C or for a short time at 650°C to 750°C. 3 Al intermetallic compound and its manufacturing method and application. Background technique [0002] In order to improve the thrust-to-weight ratio of aero-engines, it is necessary to focus on breakthroughs in key technologies such as aerodynamic design, structural design, materials, and processes of engine components. One of the main ways to reduce the weight of the engine structure is to use as many lightweight materials as possible, but currently The maximum service temperature of deformed titanium alloy is 600°C, and the maximum service temperature of cast titanium alloy is only 500°C. The service temperature limits the expansion of the use range of titanium alloy. Ti 3 Al alloy density is low (less than 5g / cm 3 ), hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C1/03C22C14/00C22F1/183
Inventor 崔玉友刘亮亮刘仁慈刘冬杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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