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A kind of processing method of tc4 titanium alloy sheet for superplastic forming

A technology of superplastic forming and processing method, applied in the field of titanium alloy material processing, can solve the problems of uneven macro-mechanical properties of plates, unable to meet the requirements of superplastic forming, deterioration of bending performance, etc., to eliminate anisotropy and grain size The effect of small size, room temperature mechanical properties and excellent structure

Active Publication Date: 2016-03-23
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the TC4 titanium alloy plates produced by conventional methods often have so-called abnormal structures such as "strip structure", "band structure" and "rib structure" caused by uneven structure. The macroscopic mechanical properties of the sheet are not uniform, especially the bending performance is deteriorated
Can not meet the requirements of superplastic forming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The processing method of the present embodiment superplastic forming TC4 titanium alloy plate comprises the following steps:

[0028] Step 1. Place the TC4 titanium alloy slab with a size of 160mm (thickness) × 800mm (width) × 1200mm (length) in a heating furnace for heating, raise the temperature of the TC4 titanium alloy slab to 960°C and keep it warm for 190min, then heat the The TC4 titanium alloy slab is sent to the hot rolling mill for the first rolling of 6 passes, the first rolling is kept as unidirectional rolling, the rolling speed is kept at 1m / s, and the deformation of each pass is 11.88 %, 16.31%, 15.31%, 13.25%, 11.11%, the total deformation is 60%, and the first semi-finished slab with a size of 64mm (thickness) × 800mm (width) × 3000mm (length) is obtained;

[0029] Step 2. Cut the first semi-finished slab described in step 1 to a size of 64mm (thickness)×800mm (width)×1150mm (length), and then place the cut first semi-finished slab in a heating furnace ...

Embodiment 2

[0037] The processing method of the present embodiment superplastic forming TC4 titanium alloy plate comprises the following steps:

[0038] Step 1. Place a TC4 titanium alloy slab with a size of 135mm (thickness)×1000mm (width)×1200mm (length) in a heating furnace for heating, raise the temperature of the TC4 titanium alloy slab to 950°C and keep it warm for 150min, then heat The TC4 titanium alloy slab is sent into the hot rolling mill for the first rolling of 6 passes, the first rolling is kept as unidirectional rolling, and the rolling speed is kept at 1.5m / s, and the deformation of each pass is respectively 10%, 15.64%, 16.59%, 17.54%, 17.02%, 14.53%, the total deformation is 62.96%, and the first semi-finished slab with a size of 50mm (thickness) × 1000mm (width) × 3240mm (length) is obtained;

[0039] Step 2. Cut the first semi-finished slab described in step 1 to a size of 50 mm (thickness) × 1000 mm (width) × 1500 mm (length), and then place the cut first semi-finishe...

Embodiment 3

[0047] The processing method of the present embodiment superplastic forming TC4 titanium alloy plate comprises the following steps:

[0048] Step 1. Place a TC4 titanium alloy slab with a size of 150mm (thickness) × 800mm (width) × 1000mm (length) in a heating furnace for heating, raise the temperature of the TC4 titanium alloy slab to 940°C and keep it warm for 175min, then heat it The TC4 titanium alloy slab is sent into the hot rolling mill for the first rolling of 7 passes, the first rolling is kept as unidirectional rolling, and the rolling speed is kept at 1.5m / s, and the deformation of each pass is respectively 10.7%, 15.2%, 16.04%, 16.85%, 14.86%, 12.69%, 10.94%, the total deformation is 65%, and the size is 52.5mm (thickness) × 800mm (width) × 2857.1mm (length). Semi-finished slabs;

[0049] Step 2. Cut the first semi-finished slab described in step 1 to a size of 52.5mm (thickness)×800mm (width)×1000mm (length), and then place the cut first semi-finished slab in the...

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Abstract

The invention provides a processing method of a TC4 titanium alloy plate for superplastic forming. The processing method comprises the following steps of 1, carrying out first rolling on the TC4 titanium alloy plate after heating so as to obtain a first semi-finished product plate billet; 2, carrying out second rolling on the first semi-finished product plate billet after heating so as to obtain a second semi-finished product plate billet; 3, carrying out beta quenching treatment; 4, carrying out third rolling on the second semi-finished product plate billet after heating so as to obtain a third semi-finished product plate billet; 5, carrying out middle annealing treatment; 6, enabling the third semi-finished product plate billet to enter a cold-rolling mill to carry out fourth rolling so as to obtain a fourth semi-finished product plate billet; and 7, carrying out finished product annealing treatment so as to obtain the TC4 titanium alloy plate for the superplastic forming the thickness of which is 1.2mm-4mm. The processing method provided by the invention has the advantages that the heating temperature, rolling deformation, annealing and quenching treatment of a productive process are controlled through quantization, the prepared longitudinal grains are uniformly distributed in an equiaxial mode, and the TC4 titanium alloy plate for the superplastic forming has an excellent mechanical property.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a processing method of TC4 titanium alloy plate for superplastic forming. Background technique [0002] Titanium alloy has the characteristics of light weight, high specific strength and corrosion resistance, and is widely used in aviation, aerospace, shipbuilding, chemical industry, electric power, metallurgy, environmental protection and other industries. The main characteristics of TC4 (Ti-6Al-4V) titanium alloy are excellent comprehensive performance and good process characteristics, but its machinability is poor, especially for parts with complex shapes, and the yield is very low. Superplastic processing is very effective in improving its yield. In recent years, the use of superplastic forming (SPF) to prepare titanium alloys with good comprehensive properties has become one of the hot research directions. TC4 titanium alloy is consid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/02
Inventor 党鹏张晓卫杨利陈均伟高维娜付文杰吴晓东王瑞琴李辉张清李长亮舒滢
Owner WESTERN TITANIUM TECH
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