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High-strength metastable beta-type titanium alloy bar and production method thereof

A titanium alloy and bar technology is applied in the field of high-strength metastable β-type titanium alloy bar and its preparation, which can solve the problems of prolonging the hot working process of forgings, reducing the room temperature plasticity of the alloy, affecting the elongation of the alloy, etc., so as to meet the mechanical properties. demand, reduce high temperature deformation resistance, improve the effect of phase transition point

Active Publication Date: 2015-06-24
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Cr content in the TB2 titanium alloy is 8%, and its Cr content is higher than that of other early β-type titanium alloys, so that the β transformation point temperature of the alloy (T β ) is low, during the forging process in the β phase region, because there is no α phase in the microstructure, and the broken β grains are heated repeatedly during the forging process, causing the grains to grow again, resulting in coarsening of the microstructure, This will seriously affect the elongation of the alloy
In addition, high Cr content will also increase the deformation resistance of TB2 alloy during forging deformation, resulting in high forging temperature and more fire times, prolonging the hot working process of the entire forging, resulting in coarse final hot forging structure, and reducing the room temperature of the alloy Plasticity

Method used

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  • High-strength metastable beta-type titanium alloy bar and production method thereof
  • High-strength metastable beta-type titanium alloy bar and production method thereof
  • High-strength metastable beta-type titanium alloy bar and production method thereof

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Embodiment 1

[0033] The high-strength metastable β-type titanium alloy bar of this embodiment is composed of the following atomic percentages: Al 3%, V 5%, Mo 5%, Cr 4%, and the balance is Ti and unavoidable impurities; the high-strength metastable The tensile strength of the stable β-type titanium alloy rod at room temperature is ≥1290MPa.

[0034] The preparation method of the high-strength metastable β-type titanium alloy bar in this embodiment comprises the following steps:

[0035] Step 1. Mix 0-grade sponge titanium, molybdenum powder, Al-V master alloy and chromium flakes according to the design composition and press them into electrode rods, weld 4 electrode rods into electrodes, and then place the electrodes in vacuum arc melting In the furnace, titanium alloy ingots were prepared through three times of smelting; the average particle size of the 0-grade sponge titanium was not greater than 13.0mm, the average particle size of the chromium flakes was not greater than 2mm, and the m...

Embodiment 2

[0042] The high-strength metastable β-type titanium alloy bar in this embodiment is composed of the following atomic percentages: Al 3%, V 5%, Mo 5%, Cr 5%, and the balance is Ti and unavoidable impurities; the high-strength metastable The tensile strength of the stable β-type titanium alloy rod at room temperature is ≥1290MPa.

[0043] The preparation method of the high-strength metastable β-type titanium alloy bar in this embodiment comprises the following steps:

[0044] Step 1. Mix the 0-grade sponge titanium, molybdenum powder, Al-V master alloy and chromium flakes according to the design composition and press them into electrode rods, weld the three electrode rods into electrodes, and then place the electrodes in vacuum arc melting In the furnace, titanium alloy ingots were prepared through three times of smelting; the average particle size of the 0-grade sponge titanium was not greater than 13.0mm, the average particle size of the chromium flakes was not greater than 2m...

Embodiment 3

[0051] The high-strength metastable β-type titanium alloy bar of this embodiment is composed of the following atomic percentages: Al 3%, V 5%, Mo 5%, Cr 6%, and the balance is Ti and unavoidable impurities; the high-strength metastable The tensile strength of the stable β-type titanium alloy rod at room temperature is ≥1290MPa.

[0052] The preparation method of the high-strength metastable β-type titanium alloy bar in this embodiment comprises the following steps:

[0053] Step 1. Mix the 0-grade sponge titanium, molybdenum powder, Al-V master alloy and chromium flakes according to the design composition and press them into electrode rods, weld the three electrode rods into electrodes, and then place the electrodes in vacuum arc melting In the furnace, titanium alloy ingots were prepared through three times of smelting; the average particle size of the 0-grade sponge titanium was not greater than 13.0mm, the average particle size of the chromium flakes was not greater than 2m...

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Abstract

The invention discloses a high-strength metastable beta-type titanium alloy bar. The high-strength metastable beta-type titanium alloy bar comprises, by atomic percent, 13% of Al, 5% of V, 5% of Mo, 4%-6% of Cr and the balance Ti and inevitable impurities. Additionally, the invention further discloses a production method of the high-strength metastable beta-type titanium alloy bar. The production method includes firstly, preparing titanium alloy casting ingots; secondly, producing forging billets by billet forging; thirdly, producing a semi-finished titanium alloy bar by upsetting and stretching forging and radial forging; fourthly, subjecting the semi-finished titanium alloy bar to solid solution treatment and aging treatment so as to obtain the metastable beta-type titanium alloy bar. The high-strength metastable beta-type titanium alloy bar produced by the specific heat forging technique and a solid solution and aging treatment system has excellent comprehensive mechanical property; at the room temperature, tensile strength of the high-strength metastable beta-type titanium alloy bar is not less than 1290MPa, yield strength thereof is not less than 1190MPa, elongation percentage thereof is not less than 11%, and section shrinkage rate thereof is not less than 45%.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material preparation, and in particular relates to a high-strength metastable β-type titanium alloy rod and a preparation method thereof. Background technique [0002] Due to its high specific strength and good comprehensive mechanical properties, titanium alloy has been widely used in aviation, aerospace, shipbuilding, petroleum, chemical industry, vehicle engineering and biomedical engineering and other fields. High-strength titanium alloy usually refers to the tensile strength R at room temperature after heat treatment m Titanium alloy not less than 1100MPa. β-type titanium alloy has excellent cold and hot plastic processing properties and easy forging deformation properties, and can obtain high comprehensive mechanical properties through solid solution + aging treatment or deformation heat treatment. At present, the high-strength β-type titanium alloys that have been practically used ...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18
Inventor 程军牛金龙于振涛余森刘少辉张亚峰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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