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Heat treatment process of TC4 alloy casting

An alloy casting and process technology, which is applied in the field of heat treatment of TC4 alloy castings, can solve problems such as increasing the sensitivity of casting properties and limiting alloy properties.

Active Publication Date: 2022-07-22
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, since the shaping of cast titanium alloys is generally much lower than that of forging and powder metallurgy, it limits the performance of the alloy and increases the sensitivity of casting properties to defects.

Method used

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  • Heat treatment process of TC4 alloy casting
  • Heat treatment process of TC4 alloy casting
  • Heat treatment process of TC4 alloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The material used in this example is a TC4 alloy cast rod with a diameter of 25mm and a length of 200mm, its composition is Ti-6.5Al-4.2V, and its alloy phase transformation point is 1005°C;

[0019] The TC4 alloy casting was heated to 1010℃ for 30min, then water cooled, and then the furnace temperature was raised to 990℃. After the casting was installed in the furnace, it was rapidly heated to 990℃ for 100min, and then cooled to 980℃ for 100min with the furnace, and then heated to 990℃ with the furnace. Incubate for 100min; then cool down to 980°C for 100min with the furnace, then heat up to 990°C with the furnace and hold for 100min; then cool down to 980°C for 100min with the furnace, then heat up to 990°C for 100min with the furnace; then cool down to 980°C with the furnace Hold at 975°C for 100min, then heat up to 990°C with the furnace and hold for 100min; then cool down to 975°C for 100min, then heat up to 985°C with the furnace, hold for 100min; The temperature ...

Embodiment 2

[0025] The material used in this example is a TC4 alloy cast rod with a diameter of 25mm and a length of 200mm, its composition is Ti-6.5Al-4.2V, and its alloy phase transformation point is 1005°C;

[0026] The TC4 alloy casting was heated to 1010℃ for 30min, then water-cooled, and then the furnace temperature was raised to 990℃. The casting was heated to 990℃, and then maintained for 100min, then cooled to 980℃ with the furnace and kept for 100min, and then heated to 990℃ with the furnace. After that, it was kept for 100 minutes; then it was cooled down to 980 °C for 100 minutes with the furnace, then heated to 990 °C with the furnace, and then kept for 100 minutes; then it was cooled to 980 °C with the furnace for 100 minutes, then heated to 990 °C with the furnace, and then kept for 100 minutes; then cooled with the furnace Heat to 975°C for 100min, then heat up to 985°C with the furnace and hold for 100min; then cool down to 975°C for 100min with the furnace, then heat up t...

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Abstract

The invention discloses a heat treatment process of a TC4 alloy casting, which comprises the following steps: 1) heating the TC4 alloy casting to 5-10 DEG C higher than beta transformation temperature, and discharging and water-cooling the TC4 alloy casting after the TC4 alloy casting is completely heated; and (2) after the furnace temperature is increased to 15-30 DEG C below the beta transformation temperature of the alloy, the casting is placed in the heat treatment furnace, the temperature is rapidly increased to the set temperature again, and then heat preservation is conducted for 60-180 minutes. And (3) the casting is cooled by 10-15 DEG C along with the furnace, heat preservation continues to be conducted for 60-180 minutes, then the temperature is increased to 15-30 DEG C below the beta transformation temperature, and heat preservation continues to be conducted for 60-180 minutes. And repeating the steps for 5-10 times. And (4) finally, the casting is cooled to 30-40 DEG C below the beta transformation temperature along with the furnace, heat preservation is conducted for 90-120, and then air cooling is conducted. The casting finally obtains a double-state structure, and the room-temperature ductility of the casting can reach 10% or above.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and particularly relates to a heat treatment process of a TC4 alloy casting. Background technique [0002] TC4 alloy has excellent comprehensive properties and is widely used in aviation, aerospace, medical, chemical and other fields. The alloy has good processing performance and can be formed by forging, casting, powder metallurgy, 3D printing and other methods. of titanium alloy. [0003] Compared with technologies such as forging, 3D printing and powder metallurgy, casting technology has the advantages of high metal utilization, low cost, and short production cycle. And with the rapid development of precision casting and hot isostatic pressing technology, the use of casting to prepare parts with complex structural shapes has attracted more and more attention. However, the shape of cast titanium alloy is generally much lower than that of forging and powder metallurgy, which limits the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183Y02P10/20
Inventor 刘建杨久旭李文渊王清江赵子博
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI