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A Method of Controlling Grain Equiaxation to Improve the Plasticity of Ti20zr6.5al4v Alloy

A ti20zr6.5al4v, alloy technology, applied in the field of materials, can solve the problems of only 2.05% elongation, plasticity needs to be improved urgently, and the effect is not obvious, so as to achieve the effect of easy operation, low processing cost and simple process flow

Active Publication Date: 2017-11-24
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti20Zr6.5Al4V alloy is a new type of titanium alloy recently developed. After aging treatment at 500 °C, its microstructure is mainly fine lath-like α phase, and its yield strength can be as high as 1600 MPa. However, its elongation is only 2.05%. needs to be improved
At present, the processing methods for this alloy are limited to forging, aging, annealing and other processing techniques. The microstructure is a single lamellar structure. Although the plasticity has been improved, the effect is not obvious.

Method used

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  • A Method of Controlling Grain Equiaxation to Improve the Plasticity of Ti20zr6.5al4v Alloy
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  • A Method of Controlling Grain Equiaxation to Improve the Plasticity of Ti20zr6.5al4v Alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take the Ti20Zr6.5Al4V alloy bar, the mass percentage of its chemical composition is Ti: 67.1%, Zr: 18.8%, Al: 5.6%, V: 3.8%, and cut the alloy bar into Φ42×16mm round ingots with a wire cutting machine And clean up, the alloy ingot is put into the vacuum tube type electric resistance furnace heat (treatment furnace model: QSH-VTF-1200T; Manufacturer: Shanghai Quanshuo Electric Furnace Co., Ltd., the following examples are the same) to heat, using argon as the protective atmosphere, When the temperature rises to 970°C, keep it warm for 30 minutes, take out the alloy ingot and quickly put it in water for quenching; before rolling, use a box-type resistance furnace (model: KL-13; manufacturer: Tianjin Kaiheng Electric Heating Technology Co., Ltd., the following The embodiment is the same) the temperature is raised to 800°C at a heating rate of 10°C / min, and after holding the heat for 2min, the alloy ingot is rolled and deformed with a twin-roll mill at a rolling speed of 0...

Embodiment 2

[0027] Take the Ti20Zr6.5Al4V alloy bar, the mass percentage of its chemical composition is Ti: 67.1%, Zr: 18.8%, Al: 5.6%, V: 3.8%, and cut the alloy bar into Φ42×16mm round ingots with a wire cutting machine And clean it up, heat the alloy ingot in a vacuum tube resistance furnace, use argon as a protective atmosphere, when the temperature rises to 970 ° C, keep it warm for 30 minutes, take out the alloy ingot and quickly put it in water for quenching; before rolling, use The box-type resistance furnace raised the temperature to 850°C at a heating rate of 10°C / min. After holding the temperature for 4 minutes, the alloy ingot was rolled and deformed with a two-roll rolling mill. The rolling speed was 0.4m / s, and the single-pass pressing The amount is 1.5mm; after each pass of rolling, put the alloy into the heat treatment furnace for reheating, when the temperature rises to 850°C, keep it warm for 4 minutes and then roll again, repeat heating-rolling 7 times in this way until ...

Embodiment 3

[0029] Take the Ti20Zr6.5Al4V alloy bar, the mass percentage of its chemical composition is Ti: 66.5%, Zr: 18.7%, Al: 6.0%, V: 3.9%, and cut the alloy bar into Φ42×16mm round ingots with a wire cutting machine And clean it up, heat the alloy ingot in a vacuum tube resistance furnace, use argon as a protective atmosphere, when the temperature rises to 1050 ° C, keep it warm for 20 minutes, take out the alloy ingot and quickly put it in water for quenching; before rolling, use The box-type resistance furnace raises the temperature to 900°C at a heating rate of 10°C / min. After holding the temperature for 1min, the alloy ingot is rolled and deformed with a two-roll rolling mill at a rolling speed of 0.6m / s, and single-pass pressing The amount is 2mm; after each pass of rolling, put the alloy into the heat treatment furnace for reheating, when the temperature rises to 900°C, keep it warm for 1min and then roll again, repeat heating-rolling 5 times until the thickness of the alloy is...

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Abstract

The invention relates to a method for controlling grain equi-axiation to improve plasticity of a Ti20Zr6.5Al4V alloy. The method mainly comprises the steps that a Ti20Zr6.5Al4V alloy bar is cut into a round ingot with the thickness being 16 mm, and the round ingot is cleaned up; the round ingot is put into a resistance furnace to be heated till the temperature ranges from 950 DEG C to 1,050 DEG C, heat preservation is carried out for 20 min to 40 min, and the round ingot is quickly placed in water for quenching after being taken out; then the alloy ingot is heated till the temperature ranges from 750 DEG C to 900 DEG C at the speed being 10 DEG C / min, the heat preservation time is shorter than 5 min, the alloy ingot is subjected to rolling deformation through a dual-roller mill after being taken out, the rolling speed ranges from 0.3 m / s to 0.6 m / s, and the reduction in single pass ranges from 0.5 mm to 2 mm; heating-rolling is repeated 5-20 times in the same way till deformation reaches 60% or above, and air cooling is carried out until the room temperature is obtained; and then the alloy is subjected to annealing treatment after being heated, the annealing temperature ranges from 750 DEG C to 850 DEG C, and furnace cooling is carried out until the room temperature is obtained after heat preservation is carried out for 1 h to 12 h. According to the method, operation is easy, and the production cost is low; and the plasticity of the alloy is remarkably improved while strength is guaranteed.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to a method for providing plasticity of titanium alloy. Background technique [0002] Titanium alloy is an important metal structural material that was developed and applied in the 1950s. Due to its excellent physical and chemical properties and high specific strength, it has become a key structural material in aerospace and other fields. Ti20Zr6.5Al4V alloy is a new type of titanium alloy recently developed. After aging treatment at 500 °C, its microstructure is mainly fine lath-like α phase, and its yield strength can be as high as 1600 MPa. However, its elongation is only 2.05%. urgently need to be improved. At present, the treatment methods for this alloy are limited to forging, aging, annealing and other processing techniques. The microstructure is a single lamellar structure. Although the plasticity has been improved, the effect is not obvious. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22F1/18C22F1/02
CPCC22C14/00C22F1/002C22F1/02C22F1/183
Inventor 马明臻岳赟钟华张世良张新宇刘日平
Owner YANSHAN UNIV
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