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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 alloy forgings prepared by conventional forging processes have many problems such as easy cracking of forgings, uneven deformation structure, etc., resulting in poor quality of TA7 titanium alloy forgings, which are not suitable for mass production of TA7 titanium alloy forgings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of present embodiment TA7 titanium alloy cake material comprises the following steps:

[0026] Step 1. The TA7 titanium alloy consumable electrode is melted twice by vacuum consumable arc to obtain a TA7 titanium alloy ingot with a cross-sectional diameter of 700mm, and then cut off the riser and ingot bottom of the TA7 titanium alloy ingot, and remove the TA7 The surface defect of titanium alloy ingot; The mass percentage content of tin in the TA7 titanium alloy ingot is 2.00%, the mass percentage content of aluminum is 5.00%, the mass percentage content of oxygen is 0.07%, and the balance is titanium and unavoidable impurities; wherein tin is allocated in the form of Ti-Sn master alloy, aluminum is allocated in the form of pure aluminum, and oxygen is allocated in the form of titanium dioxide;

[0027] Step 2. Using a fast forging machine, the TA7 titanium alloy ingot described in step 1 is subjected to 2 rounds of blank forging under the condit...

Embodiment 2

[0032] The preparation method of present embodiment TA7 titanium alloy cake material comprises the following steps:

[0033] Step 1. The TA7 titanium alloy consumable electrode is smelted three times by vacuum consumable arc to obtain a TA7 titanium alloy ingot with a cross-sectional diameter of 800mm, and then cut off the riser and ingot bottom of the TA7 titanium alloy ingot, and remove the TA7 The surface defect of titanium alloy ingot; The mass percent composition of tin in the TA7 titanium alloy ingot is 2.50%, the mass percent composition of aluminum is 5.37%, the mass percent composition of oxygen is 0.10%, and the balance is titanium and unavoidable impurities; wherein tin is allocated in the form of Ti-Sn master alloy, aluminum is allocated in the form of pure aluminum, and oxygen is allocated in the form of titanium dioxide;

[0034] Step 2. Using a fast forging machine, the TA7 titanium alloy ingot described in step 1 is subjected to 3 times of blank forging under t...

Embodiment 3

[0039] The preparation method of present embodiment TA7 titanium alloy cake material comprises the following steps:

[0040] Step 1. The TA7 titanium alloy consumable electrode is smelted three times by vacuum consumable arc to obtain a TA7 titanium alloy ingot with a cross-sectional diameter of 900mm, then cut off the riser and ingot bottom of the TA7 titanium alloy ingot, and remove the TA7 The surface defect of titanium alloy ingot; The mass percentage composition of tin in the TA7 titanium alloy ingot is 3.0%, the mass percentage composition of aluminum is 5.75%, the mass percentage composition of oxygen is 0.12%, and the balance is titanium and unavoidable impurities; wherein tin is allocated in the form of Ti-Sn master alloy, aluminum is allocated in the form of pure aluminum, and oxygen is allocated in the form of titanium dioxide;

[0041] Step 2. Using an electro-hydraulic hammer to carry out the blank forging of the TA7 titanium alloy ingot described in the step 1 un...

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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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