Method for realizing near alpha titanium alloy dual-property employing local loading process

A local loading, titanium alloy technology, applied in the field of near-alpha titanium alloy dual performance, can solve the problems of weak interface, complex and difficult to control process, low production efficiency, etc., to achieve long strength, high room temperature plasticity, high high temperature strength. Effect

Inactive Publication Date: 2010-12-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems existing in the prior art, such as complex process flow, difficult control, low production efficiency, and "weak connection" at the interface, the present invention proposes a method for achieving dual properties of near-alpha titanium alloys by using a local loading process

Method used

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  • Method for realizing near alpha titanium alloy dual-property employing local loading process
  • Method for realizing near alpha titanium alloy dual-property employing local loading process
  • Method for realizing near alpha titanium alloy dual-property employing local loading process

Examples

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Embodiment 1

[0037] This embodiment is a method for realizing the dual performance of near-alpha titanium alloy rectangular cross-section beams by adopting a local loading process.

[0038] The raw material of this example is a TA15 titanium alloy bar with a diameter of Φ300mm, the nominal composition is Ti-6Al-2Zr-1Mo-1V, and the phase transition point T β It is 990°C, and the recrystallization temperature is 830°C. The specific process is as follows:

[0039] The first step, blank forging

[0040] Heat the bar in a box-type resistance furnace to T β +40°C, keep warm for 2 hours, upsetting and elongating on the fast forging machine, the deformation amount is 50% to 70%, water-cooled to 25°C after forging; then the obtained blank is heated to T β -50°C, keep warm for 2h, carry out re-forging on a quick forging machine, repeatedly upsetting and elongating, the deformation amount is 50% to 70%, and water-cooled to 25°C after forging.

[0041] The second step, preform preparation

[0042...

Embodiment 2

[0055] This embodiment is a method for realizing the dual performance of near-alpha titanium alloy rectangular cross-section beams by adopting a local loading process.

[0056] The raw material of this example is a TA15 titanium alloy rod with a diameter of Φ500mm, the nominal composition is Ti-6Al-2Zr-1Mo-1V, and the phase transition point T β It is 990°C, and the recrystallization temperature is 830°C. The specific process is as follows:

[0057] The first step, blank forging

[0058] Heat the bar in a box-type resistance furnace to T β +50°C, keep warm for 1h, upsetting and elongating on the fast forging machine, the deformation amount is 50% to 70%, water-cooled to 25°C after forging; then the obtained blank is heated to T β -40°C, heat preservation for 1h, re-forging on the fast forging machine, repeated upsetting and elongation, the deformation amount is 50% to 70%, and water-cooled to 25°C after forging.

[0059] The second step, preform preparation

[0060] In the...

Embodiment 3

[0073] This embodiment is a method for realizing the double performance of near-alpha titanium alloy disc by adopting partial loading process.

[0074] The raw material of this example is TA15 titanium alloy bar with Φ400mm, nominal composition Ti-6Al-2Zr-1Mo-1V, phase transition point T β It is 990°C, and the recrystallization temperature is 830°C. The specific operation is as follows:

[0075] The first step, blank forging

[0076] Heat the bar in a box-type resistance furnace to T β +40°C, keep warm for 2 hours, upsetting and elongating on the fast forging machine, the deformation amount is 50% to 70%, water-cooled to 20°C after forging; then the obtained blank is heated to T β -40°C, heat preservation for 2h, re-forging on the fast forging machine, repeated upsetting and elongation, the deformation amount is 50% to 70%, and water-cooled to 20°C after forging.

[0077] The second step, preform preparation

[0078] In the box-type resistance furnace, the reforged billet...

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Abstract

The invention discloses a method for realizing near alpha titanium alloy dual-property employing local loading process, which divides a workpiece into an A loading zone and a B loading zone, and a C zone is the transition zone between the A loading zone and the B loading zone, wherein the A loading zone is a large deformation zone while the B loading zone is a small deformation zone, and the method is realized through the isothermal local loading with two passes and two loading steps in each pass. The specific shaping process comprises blank forging, preparation of preforming billet, isothermal local loading, finishing, thermal treatment and nondestructive testing. The shaped workpiece can obtain the tri-modal microstructure with high room temperature plasticity, high strength and long fatigue life and 20% equiaxial alpha phase content in the A loading zone, the lamellar microstructure with high tensile strength at high temperature, high fracture toughness and strong creep deformationresistance in the B loading zone, and the bimodal microstructure with higher equiaxial alpha phase content in the C transition zone than in the A loading zone so as to further realize the dual-property of the integral component; therefore, the method is a simple and efficient shaping method for the integral dual-property component.

Description

1. Technical field [0001] The invention relates to the field of thermal processing, in particular to a method for realizing dual properties of near-alpha titanium alloy by adopting a local loading process. 2. Background technology [0002] For some components with complex service environments, the stress conditions and service environments of different parts of the same component are often different. Especially in aerospace components, this kind of situation is particularly prominent. For example, for some beam structures in aircraft, the high-temperature working end has a higher temperature, while the fixed end has a relatively low operating temperature but needs to bear greater stress. In order to meet high performance and high reliability, it is objectively required that the high temperature working end of the beam should have high high temperature tensile strength, fracture toughness and creep resistance, while the fixed end should have high room temperature tensile str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 孙志超杨合周稳静
Owner NORTHWESTERN POLYTECHNICAL UNIV
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