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Mechanical heat treatment method for obtaining duplex microstructures of metastable beta titanium alloys

A technology of mechanical heat treatment and beta titanium alloy, which is applied in the field of mechanical heat treatment of metastable beta titanium alloy and obtains the bimorphic structure of metastable beta titanium alloy. , the effect of reducing the deformation resistance

Active Publication Date: 2019-02-12
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and effective mechanical heat treatment method for obtaining the two-state structure of metastable β-titanium alloy, so as to solve the problems such as processing difficulties in existing mechanical heat treatment technology

Method used

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  • Mechanical heat treatment method for obtaining duplex microstructures of metastable beta titanium alloys
  • Mechanical heat treatment method for obtaining duplex microstructures of metastable beta titanium alloys
  • Mechanical heat treatment method for obtaining duplex microstructures of metastable beta titanium alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Determination of alloy phase transition temperature. The selected metastable beta titanium alloy is Ti-55531, and its nominal composition is Ti-5Al-5Mo-5V-3Cr-1Zr (wt.%). The phase transition temperature T of the alloy is determined by calculation and metallographic methods. β ≈803°C.

[0032] Step 2: Alloy high temperature homogenization treatment. Place 150g of the alloy ingot in a heat treatment furnace, heat it to 1100°C at a temperature increase rate of 10°C / s, keep it for 12 hours and then cool it down to room temperature in the furnace.

[0033] Step 3: Alloy thermal deformation and short-time recrystallization annealing. The alloy ingot is first held at 1050°C for 5 minutes and then forged for 3 fires. As the thermal deformation continues, the deformation temperature of the ingot can be reduced one fire at a time, but not less than 903°C. The second deformation is controlled within the range of 30-50%. Subsequently, the alloy is forged for a total of 5 fir...

Embodiment 2

[0037] Step 1: Determination of alloy phase transition temperature. The selected metastable beta titanium alloy is Ti-1023, and its nominal composition is Ti-10V-2Fe-3Al (wt.%). The phase transition temperature T of the alloy is determined by calculation and metallographic methods. β ≈805°C.

[0038] Step 2: Alloy high temperature homogenization treatment. Place 150g of the alloy ingot in a heat treatment furnace, heat it to 1100°C at a temperature increase rate of 10°C / s, keep it for 12 hours and then cool it down to room temperature in the furnace.

[0039] Step 3: Alloy thermal deformation and short-time recrystallization annealing. The alloy ingot is first held at 1050°C for 5 minutes, and then it is forged for 3 fires. As the thermal deformation continues, the deformation temperature of the ingot can be reduced successively, but not less than 905°C. The second deformation is controlled within the range of 30-50%. Subsequently, the alloy is forged for a total of 5 fires, the...

Embodiment 3

[0043] Step 1: Determination of alloy phase transition temperature. The selected metastable β titanium alloy is Ti-7333, and its nominal composition is Ti-7Mo-3Nb-3Cr-3Al (wt.%). The phase transition temperature T of the alloy is determined by calculation and metallographic methods. β ≈850℃.

[0044] Step 2: Alloy high temperature homogenization treatment. Place 150g of the alloy ingot in a heat treatment furnace, heat it to 1150°C at a heating rate of 10°C / s, keep it for 15h, and then cool it down to room temperature in the furnace.

[0045] Step 3: Alloy thermal deformation and short-time recrystallization annealing. The alloy ingot is first held at 1050°C for 5 minutes and then forged for 3 fires. As the thermal deformation continues, the deformation temperature of the ingot can be reduced one fire at a time, but not less than 950°C. The second deformation is controlled within the range of 30-50%. Subsequently, the alloy is forged for a total of 5 fires. The deformation tempe...

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Abstract

The invention discloses a mechanical heat treatment method for obtaining duplex microstructures of metastable beta titanium alloys. The method comprises the following steps: the phase transformation temperature T beta of the metastable beta titanium alloys is measured; the alloys are homogenized at high temperature, and the cooling mode adopts furnace cooling; the ingot cogging and previous upsetting process of the alloys is performed in a beta single-phase area; the rest upsetting process is performed at a temperature below and near T beta; after heat heating number, the short-time recrystallization annealing is performed; and the two-phase region heat treatment is performed on deforming alloys. The heat deformation is performed in the beta single-phase area at the temperature below and near T beta, so that the deformation resistance is prominently reduced, and the forging defect is effectively controlled; the deformation resistance of beta single-phase regions of the alloys is low, the deformation is effectively controlled, and the structure uniformity is guaranteed; and the whole mechanical heat treatment method is convenient to operate, high in machining efficiency and low in energy loss, and prominently improves the mechanical performances of the structures.

Description

Technical field [0001] The invention relates to a metastable beta titanium alloy mechanical heat treatment technology, in particular to a simple and effective method for obtaining a metastable beta titanium alloy dual-state structure, and belongs to the field of titanium alloy material processing. Background technique [0002] Metastable beta titanium alloy has a variety of excellent properties such as high specific strength, high specific rigidity, corrosion resistance and non-magnetic properties. It is the only candidate material to achieve lighter weight of key components and further substantial weight reduction, which can replace high-strength steel. The mainstream structural materials of the first generation of aerospace aircraft (such as the main beam of the Boeing 777 landing gear and the landing gear pillar of the Airbus A380 use a large amount of metastable beta titanium alloy). In addition, metastable beta titanium alloys are also widely used in marine ships, medical eq...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/002C22F1/183
Inventor 陈光潘曦苏翔冯辰铭
Owner NANJING UNIV OF SCI & TECH
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