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Heat treatment process of TC11 titanium alloy casting

A technology of TC11 and titanium alloy, which is applied in the field of new materials, can solve problems such as poor plasticity and difficulty in regulating the casting structure of TC11 titanium alloy, and achieve the effect of improving plasticity and matching mechanical properties

Active Publication Date: 2022-07-26
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

[0004] The purpose of the present invention is to solve the problems such as difficulty in regulating and controlling the casting structure of TC11 titanium alloy and poor plasticity; in order to solve the above technical problems, the present invention combines the phase transition characteristics of TC11 alloy and proposes a heat treatment process for TC11 titanium alloy castings; the specific scheme is as follows :

Method used

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  • Heat treatment process of TC11 titanium alloy casting
  • Heat treatment process of TC11 titanium alloy casting
  • Heat treatment process of TC11 titanium alloy casting

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The material used in this example is a TC11 alloy cast rod with a specification of φ25mm×200mm, its composition is Ti-6.6Al-3.5Mo-1.8Zr-0.3Si, and its alloy transformation point is 1021°C;

[0020] 1) First, heat the TC11 cast rod to 1010°C for 60min;

[0021] 2) Cool the cast rod to 1007°C by furnace cooling, and continue to keep the temperature for 60min;

[0022] 3) Continue furnace cooling to 1004°C and hold for 60min; continue furnace cooling to 1001°C and hold for 60min; continue furnace cooling to 998°C and hold for 60min; continue furnace cooling to 995°C and hold for 60min; continue furnace cooling to 992°C and hold 60min; continue furnace cooling to 989°C and hold for 60min; continue furnace cooling to 986°C and hold for 60min; continue furnace cooling to 983°C and hold for 60min; continue furnace cooling to 980°C and hold for 120min; continue furnace cooling to 977°C and hold for 120min; continue The furnace is cooled to 974 ℃ and kept for 120 minutes, and t...

Embodiment 2

[0031] The material used in this example is TC11 casting barrel material with a specification of φ450mm×φ430×600mm, and its alloy transformation point is 1021°C;

[0032] 1) First, heat the TC11 cast rod to 1010°C for 60min;

[0033] 2) Cool the cast rod to 1007°C by furnace cooling, and continue to keep the temperature for 60min;

[0034] 3) Continue furnace cooling to 1004°C and hold for 60min; continue furnace cooling to 1001°C and hold for 60min; continue furnace cooling to 998°C and hold for 60min; continue furnace cooling to 995°C and hold for 60min; continue furnace cooling to 992°C and hold 60min; continue furnace cooling to 989°C and hold for 60min; continue furnace cooling to 986°C and hold for 60min; continue furnace cooling to 983°C and hold for 60min; continue furnace cooling to 980°C and hold for 120min; continue furnace cooling to 977°C and hold for 120min; continue Furnace cooling to 974°C for 120min; continue furnace cooling to 971°C for 120min, then air-cool...

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Abstract

The invention discloses a heat treatment process of a TC11 alloy casting, which is characterized by comprising the following steps of: 1) heating an alloy to 3-5 DEG C (T1) below T beta, and preserving heat for t1; and (2) the casting is cooled to T2 from T1 in a furnace cooling mode, heat preservation continues, and the heat preservation time is t2. And then furnace cooling continues to be conducted to T3, the heat preservation time is t3..., and so on. And (3) heat preservation is conducted for 60-120 min under the Tn condition, and then direct air cooling is conducted to the room temperature. And (4) the casting is heated to 500-600 DEG C, heat preservation is conducted for 2-8 h, and then air cooling is conducted to the room temperature. Wherein Tn (n = 1, 2, 3...) is a heat preservation temperature, and T1 > T2 > T3 >... > Tn; ti (i = 1, 2, 3...) is the heat preservation time, and ti is larger than or equal to 30 min and smaller than or equal to 90 min. The final structure of the TC11 titanium alloy casting is a double-state structure, the content of a primary alpha lamella is about 30%-40%, and the average length-diameter ratio is smaller than or equal to 3. The final room-temperature tensile strength of the alloy can reach 1070 MPa, and the ductility is not lower than 10%; and the tensile strength at 500 DEG C can reach 680 MPa.

Description

technical field [0001] The invention belongs to the technical field of new materials, and specifically relates to a heat treatment process of a TC11 casting. Background technique [0002] TC11 alloy is a (α+β) type titanium alloy, its nominal composition is Ti-6.5Al-3.5Mo-1.5Zr-0.3Si, it has high strength, good heat resistance and hot workability, can be It is one of the most widely used high-temperature titanium alloys in the aviation field, and is mainly used in compressor discs, blades, drums and other parts. [0003] Metal heat treatment is one of the important links in mechanical manufacturing. The microstructure of titanium alloy can be regulated by heat treatment to obtain better mechanical properties. The structure of TC11 titanium alloy castings is a coarse lamellar structure, which cannot be controlled by thermal deformation, so it is necessary to invent a heat treatment process to improve the comprehensive mechanical properties of TC11 titanium alloy castings. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22F1/183C22C14/00
Inventor 赵子博杨久旭李文渊王清江
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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