A Mechanical Heat Treatment Method for Obtaining Two-state Microstructure of Metastable β Titanium Alloy

A technology of mechanical heat treatment and β titanium alloy, which is applied in the field of mechanical heat treatment of metastable β titanium alloy to obtain the two-state structure of metastable β titanium alloy, can solve problems such as mechanical heat treatment technology processing difficulties, and achieve effective control of forging defects Improved performance and reduced deformation resistance

Active Publication Date: 2020-09-18
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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  • A Mechanical Heat Treatment Method for Obtaining Two-state Microstructure of Metastable β Titanium Alloy
  • A Mechanical Heat Treatment Method for Obtaining Two-state Microstructure of Metastable β Titanium Alloy
  • A Mechanical Heat Treatment Method for Obtaining Two-state Microstructure of Metastable β Titanium Alloy

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Experimental program
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Embodiment 1

[0031] Step 1: Determination of alloy phase transition temperature. The selected metastable β-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. 150g of the alloy ingot was placed in a heat treatment furnace, heated to 1100°C at a heating rate of 10°C / s, kept for 12 hours, and then cooled to room temperature with the furnace.

[0033] Step 3: Alloy thermal deformation and short-term recrystallization annealing. The alloy ingot is firstly held at 1050°C for 5 minutes, and then the ingot is forged for three times. As the thermal deformation continues, the deformation temperature of the ingot can be lowered step by step, but not lower than 903°C. The amount of deformation is controlled in the range of 30~50%. Subsequently, the alloy was forged for a total of 5 ...

Embodiment 2

[0037] Step 1: Determination of alloy phase transition temperature. The selected metastable β-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 method and metallographic methodβ ≈805°C.

[0038] Step 2: Alloy high-temperature homogenization treatment. 150g of the alloy ingot was placed in a heat treatment furnace, heated to 1100°C at a heating rate of 10°C / s, kept for 12 hours, and then cooled to room temperature with the furnace.

[0039] Step 3: Alloy thermal deformation and short-term recrystallization annealing. The alloy ingot is firstly held at 1050°C for 5 minutes, and then the ingot is forged for three times. As the thermal deformation continues, the deformation temperature of the ingot can be reduced step by step, but not lower than 905°C. The amount of deformation is controlled in the range of 30~50%. Subsequently, the alloy was forged for a total of 5 fires...

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°C.

[0044] Step 2: Alloy high-temperature homogenization treatment. 150g of the alloy ingot was placed in a heat treatment furnace, heated to 1150°C at a heating rate of 10°C / s, kept for 15 hours, and then cooled to room temperature with the furnace.

[0045] Step 3: Alloy thermal deformation and short-term recrystallization annealing. The alloy ingot is firstly held at 1050°C for 5 minutes, and then the ingot is forged for three times. As the thermal deformation continues, the deformation temperature of the ingot can be reduced step by step, but not lower than 950°C. The amount of deformation is controlled in the range of 30~50%. Subsequently, the alloy was forged for a total of 5 fires...

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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 β titanium alloy mechanical heat treatment technology, in particular to a simple and effective method for obtaining a bi-state structure of a metastable β titanium alloy, belonging to the field of titanium alloy material processing. Background technique [0002] Metastable β-titanium alloy has many excellent properties such as high specific strength, high specific rigidity, corrosion resistance and non-magnetic properties. The mainstream structural materials of a generation of aerospace aircraft (such as the landing gear main beam of Boeing 777 and the landing gear pillar of Airbus A380 use metastable β titanium alloy in large quantities). In addition, metastable β-titanium alloys are also widely used in marine ships, medical equipment, petrochemical and other fields. [0003] The most common microstructure of metastable β-titanium alloy is β-annealed structure, which can be obtained by thermal deformation in β-ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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