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A method for preparing high-strength modified ti-6al-4v titanium alloy large-scale rods

A ti-6al-4v, titanium alloy technology, applied in the field of titanium alloys, can solve the problems of poor consistency of structure and properties, low level of ultrasonic flaw detection, etc., and achieve the effect of good consistency, improvement of uneven structure and strength improvement.

Active Publication Date: 2018-12-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, Ti-6Al-4V titanium alloy rods with a diameter greater than 100mm have problems such as poor consistency of structure and performance, and low level of ultrasonic flaw detection.

Method used

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  • A method for preparing high-strength modified ti-6al-4v titanium alloy large-scale rods
  • A method for preparing high-strength modified ti-6al-4v titanium alloy large-scale rods
  • A method for preparing high-strength modified ti-6al-4v titanium alloy large-scale rods

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of the present embodiment comprises the following steps:

[0032] Step 1, the 0-grade sponge titanium, Al-V master alloy, Al-V-Fe master alloy, aluminum beans and TiO 2 The powders were mixed and pressed into electrodes, and then subjected to three times of vacuum consumable arc melting to obtain a Ti-6Al-4V titanium alloy ingot with a diameter of 500mm; the Ti-6Al-4V titanium alloy ingot was composed of the following mass percentages: Al 6.6%, V 4.2%, Fe 0.26%, O0.2%, C≤0.02%, N≤0.01%, H≤0.003%, and the rest is Ti; the parameters of the three vacuum consumable arc melting are: The current of the first vacuum consumable arc melting is 5kA, the voltage is 30V, and the vacuum degree is 5Pa; the current of the second vacuum consumable arc melting is 8kA, the voltage is 32V, and the vacuum degree is 0.06Pa; The current of consumable arc melting is 15kA, the voltage is 35V, and the vacuum degree is 0.05Pa;

[0033] Step 2, heat the Ti-6Al-4V titanium...

Embodiment 2

[0049] The preparation method of the present embodiment comprises the following steps:

[0050] Step 1, the 0-grade sponge titanium, Al-V master alloy, Al-V-Fe master alloy, aluminum beans and TiO 2 The powders were mixed and pressed into electrodes, and then subjected to three times of vacuum consumable arc melting to obtain a Ti-6Al-4V titanium alloy ingot with a diameter of 490 mm; the Ti-6Al-4V titanium alloy ingot was composed of the following mass percentages: Al 6.4%, V 4.3%, Fe 0.24%, O0.22%, C≤0.02%, N≤0.01%, H≤0.003%, and the rest is Ti; the parameters of the three vacuum consumable arc melting are: The current of the first vacuum consumable arc melting is 6kA, the voltage is 20V, and the vacuum degree is 3Pa; the current of the second vacuum consumable arc melting is 15kA, the voltage is 25V, and the vacuum degree is 0.03Pa; the third vacuum consumable arc melting The current of consumable arc melting is 20kA, the voltage is 25V, and the vacuum degree is 0.02Pa;

...

Embodiment 3

[0068] The preparation method of the present embodiment comprises the following steps:

[0069] Step 1, the 0-grade sponge titanium, Al-V master alloy, Al-V-Fe master alloy, aluminum beans and TiO 2The powders were mixed and pressed into electrodes, and then subjected to three times of vacuum consumable arc melting to obtain a Ti-6Al-4V titanium alloy ingot with a diameter of 520 mm; the Ti-6Al-4V titanium alloy ingot was composed of the following mass percentages: Al 6.3%, V 4.4%, Fe 0.3%, O0.25%, C≤0.02%, N≤0.01%, H≤0.003%, and the rest is Ti; the parameters of the three vacuum consumable arc melting are: The current of the first vacuum consumable arc melting is 8kA, the voltage is 25V, and the vacuum degree is 3Pa; the current of the second vacuum consumable arc melting is 10kA, the voltage is 30V, and the vacuum degree is 0.05Pa; the third vacuum consumable arc melting The current of consumable arc melting is 18kA, the voltage is 31V, and the vacuum degree is 0.04Pa;

[...

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Abstract

The invention discloses a method for preparing a high-strength modified Ti-6Al-4V titanium alloy large-size rod. The method comprises the following steps: heating Ti-6Al-4V titanium alloy ingots obtained by vacuum arc re-melting under a condition of Tbeta+100 DEG C-Tbeta+160 DEG C, keeping the temperature, performing blooming fogging, sequentially heating under conditions of Tbeta-20 DEG C-Tbeta-50 DEG C and Tbeta+20 DEG C-Tbeta+100 DEG C, keeping the temperature, performing ramming fogging, rapidly cooling with water, performing ramming fogging under a condition of Tbeta-20 DEG C-Tbeta-60 DEGC, keeping the temperature, performing air cooling so as to obtain a blank, performing chamfering, rolling rounding and throwing rounding on the blank, performing thermal treatment, and performing air cooling, thereby obtaining the high-strength modified Ti-6Al-4V titanium alloy large-size rod, wherein the diameter of the titanium alloy rod is 180-220mm, the length of the titanium alloy rod is greater than 2000mm, the tensile strength Rm of the titanium alloy rod is greater than 960Mpa, and the yield strength RP0.2 of the titanium alloy rod is greater than 860Mpa. By slightly adjusting the contents of components of main elements in the titanium alloy, and with the combination of phase cross heating, large-deformation fogging and rapid water cooling processes, the strength of the titaniumalloy is improved, and the good matching of strength and plasticity is achieved.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, in particular to a method for preparing high-strength modified Ti-6Al-4V titanium alloy large-scale rods. Background technique [0002] Structural titanium alloys represented by Ti-6Al-4V titanium alloys have good room temperature / high temperature strength, creep resistance, thermal stability, fatigue resistance, fracture toughness and stress corrosion resistance. It is the most mature and widely used titanium alloy in China. However, for the key stress-bearing parts that bear complex alternating loads, higher performance requirements such as strength, plasticity, and fatigue resistance are put forward for the material. The traditional Ti-6Al-4V titanium alloy can no longer meet the requirements of high strength and toughness. Other grades of titanium alloys have problems such as insufficient application degree. [0003] For this reason, the United States, Russia and other countries hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18B21J5/00
CPCB21J5/002C22C1/03C22C14/00C22F1/183
Inventor 贾蔚菊毛小南侯红苗赵恒章潘浩郭萍张永强
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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