Preparation method of TA7 titanium alloy cake

A titanium alloy and ingot casting technology is applied in the field of preparation of TA7 titanium alloy cakes, which can solve the problems of unsuitable mass production of TA7 titanium alloy forgings, poor quality of TA7 titanium alloy forgings, uneven deformation structure, etc., and achieve batch stability. Guaranteed, uniform microstructure, good low temperature toughness and room temperature performance

Active Publication Date: 2013-03-27
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional forging process of TA7 titanium alloy forgings is: after the blank forging is carried out in the temperature range above the β transformation point of the TA7 titanium alloy, the semi-finished product and the Finished products, TA7 titanium

Method used

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Examples

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Example Embodiment

[0024] Example 1

[0025] The preparation method of TA7 titanium alloy cake in this embodiment includes the following steps:

[0026] Step 1. The TA7 titanium alloy consumable electrode undergoes two vacuum consumable arc smelting to obtain a TA7 titanium alloy ingot with a cross-sectional diameter of 700mm, and then cut off the riser and bottom of the TA7 titanium alloy ingot, and remove the TA7 Surface defects of titanium alloy ingots; the mass percentage of tin in the TA7 titanium alloy ingots is 2.00%, the mass percentage of aluminum is 5.00%, the mass percentage of oxygen is 0.07%, and the balance is titanium And unavoidable impurities; tin is mixed in the form of Ti-Sn master alloy, aluminum is mixed in the form of pure aluminum, and oxygen is mixed in the form of titanium dioxide;

[0027] Step 2. Use a fast forging machine to perform two-fire open forging of the TA7 titanium alloy ingot described in step one at the initial forging temperature of 100°C above the β transformat...

Example Embodiment

[0031] Example 2

[0032] The preparation method of TA7 titanium alloy cake in this embodiment includes the following steps:

[0033] Step 1. The TA7 titanium alloy consumable electrode undergoes 3 vacuum consumable arc smelting to obtain a TA7 titanium alloy ingot with a cross-sectional diameter of 800mm, and then cut off the riser and bottom of the TA7 titanium alloy ingot, and remove the TA7 Surface defects of the titanium alloy ingot; the mass percentage of tin in the TA7 titanium alloy ingot is 2.50%, the mass percentage of aluminum is 5.37%, the mass percentage of oxygen is 0.10%, and the balance is titanium And unavoidable impurities; tin is mixed in the form of Ti-Sn master alloy, aluminum is mixed in the form of pure aluminum, and oxygen is mixed in the form of titanium dioxide;

[0034] Step 2. Use a fast forging machine to perform three-fire open forging of the TA7 titanium alloy ingot described in step one at the initial forging temperature of 150°C above the β transform...

Example Embodiment

[0038] Example 3

[0039] The preparation method of TA7 titanium alloy cake in this embodiment includes the following steps:

[0040] Step 1. The TA7 titanium alloy consumable electrode undergoes 3 vacuum consumable arc smelting to obtain a TA7 titanium alloy ingot with a cross-sectional diameter of 900mm. Then the riser and ingot bottom of the TA7 titanium alloy ingot are removed, and TA7 is removed Surface defects of titanium alloy ingots; the mass percentage of tin in the TA7 titanium alloy ingots is 3.0%, the mass percentage of aluminum is 5.75%, the mass percentage of oxygen is 0.12%, and the balance is titanium And unavoidable impurities; tin is mixed in the form of Ti-Sn master alloy, aluminum is mixed in the form of pure aluminum, and oxygen is mixed in the form of titanium dioxide;

[0041] Step 2. Use an electro-hydraulic hammer to carry out 4 rounds of billet forging for the TA7 titanium alloy ingot mentioned in step 1 at the initial forging temperature of 200°C above the...

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Abstract

The invention provides a preparation method of a TA7 titanium alloy cake. The method includes the following steps of firstly, cutting and removing a dead head and an ingot bottom of a TA7 titanium alloy ingot, and removing surface defects of the TA7 titanium alloy ingot; subjecting the TA7 titanium alloy ingot to blooming forging to obtain a primary forging stock; subjecting the primary forging stock to intermediate forging to obtain a semi-finished forging stock; and sawing the semi-finished forging stock, and then performing forming forging to obtain the TA7 titanium alloy cake. According to physical characteristics of TA7 titanium alloy materials, by means of proportioning design of chemical components and comprehensive control of technological parameters of initial forging temperatures, final forging temperatures, total forging ratios and the like, uniform control of microstructural dimensions of the primary forging stock, the semi-finished forging stock and the TA7 titanium alloy cake is achieved; and the micro-structure of the TA7 titanium alloy cake is uniform, low temperature mechanical performances and room temperature mechanical performances are excellent, and the preparation method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material preparation, and in particular relates to a preparation method of TA7 titanium alloy cake material. Background technique [0002] TA7 titanium alloy (nominal composition is Ti-5Al-2.5Sn) is a single-phase α-titanium alloy, which is widely used in aero-engine components, Key components such as space thruster components and ultra-low temperature storage devices. Due to the poor processing plasticity of TA7 titanium alloy in the temperature range of the two-phase region, it is easy to form cracks inside and outside the forging, the allowable deformation of forging is small, and the objective existence of the dead zone of forging deformation makes the microstructure of TA7 titanium alloy not easy. To achieve homogenization, there are certain difficulties in the quantitative control of microstructure parameters. In addition, the addition ratio of strengthening elements such as aluminu...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 吴华李维王宏权张智杨建朝叶红川李进元侯鹏文宁
Owner WESTERN TITANIUM TECH
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