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A microalloying method to increase the strength level of tc4 titanium alloy

A technology of micro-alloying and strength level, applied in the field of titanium alloy, can solve the problems of complex process, limited range of titanium alloy strength improvement, long process, etc., achieve simple process, good matching of strength and plasticity, and improve deformation plasticity

Active Publication Date: 2020-06-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only increase the strength of titanium alloy to a limited extent, and it needs to control the alloy composition and the subsequent preparation process at the same time. The process is long and complicated, and there are many factors that need to be controlled, including the control of forging process and heat treatment process.

Method used

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  • A microalloying method to increase the strength level of tc4 titanium alloy
  • A microalloying method to increase the strength level of tc4 titanium alloy
  • A microalloying method to increase the strength level of tc4 titanium alloy

Examples

Experimental program
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Embodiment 1

[0026] The method of the present embodiment comprises the following steps:

[0027] Step 1, the 0-grade sponge titanium, Al-V master alloy, Ti-Fe master alloy, aluminum beans, TiO 2 Powder and B powder are mixed and pressed into an electrode, and then vacuum consumable arc melting is carried out three times to obtain a TC4 titanium alloy ingot; the TC4 titanium alloy ingot is composed of the following mass percentages: Al 6.0%, V 4.0%, Fe 0.20%, O 0.20%, B 0.05%, C≤0.02%, N≤0.01%, H≤0.003%, and the rest is Ti; the particle size of the 0-grade sponge titanium is 0.83mm~12.7mm;

[0028] Step 2. The TC4 titanium alloy ingot obtained in step 1 is sequentially subjected to single-phase zone blanking at 100°C to 150°C above the phase transition point and two-phase zone forging at 30°C to 50°C below the phase transition point to obtain forged State TC4 titanium alloy blank;

[0029] Step 3: heat-treat the wrought TC4 titanium alloy billet obtained in step 2 at 800° C. for 1 hour, a...

Embodiment 2

[0037] The method of the present embodiment comprises the following steps:

[0038] Step 1, the 0-grade sponge titanium, Al-V master alloy, Ti-Fe master alloy, aluminum beans, TiO 2 Powder and B powder are mixed and pressed into an electrode, and then vacuum consumable arc melting is carried out three times to obtain a TC4 titanium alloy ingot; the TC4 titanium alloy ingot is composed of the following mass percentages: Al 6.2%, V 4.3%, Fe 0.28%, O 0.17%, B 0.10%, C≤0.02%, N≤0.01%, H≤0.003%, and the rest is Ti; the particle size of the 0-grade sponge titanium is 0.83mm~12.7mm;

[0039] Step 2. The TC4 titanium alloy ingot obtained in step 1 is sequentially subjected to single-phase zone blanking at 100°C to 150°C above the phase transition point and two-phase zone forging at 30°C to 50°C below the phase transition point to obtain forged State TC4 titanium alloy blank;

[0040] Step 3: heat-treat the wrought TC4 titanium alloy billet obtained in step 2 at 800° C. for 1 hour, a...

Embodiment 3

[0048] The method of the present embodiment comprises the following steps:

[0049] Step 1, the 0-grade sponge titanium, Al-V master alloy, Ti-Fe master alloy, aluminum beans, TiO 2 Powder and B powder are mixed and pressed into an electrode, and then vacuum consumable arc melting is carried out three times to obtain a TC4 titanium alloy ingot; the TC4 titanium alloy ingot is composed of the following mass percentages: Al 6.4%, V 4.2%, Fe 0.26%, O 0.15%, B 0.12%, C≤0.02%, N≤0.01%, H≤0.003%, and the rest is Ti; the particle size of the 0-grade sponge titanium is 0.83mm~12.7mm;

[0050] Step 2. The TC4 titanium alloy ingot obtained in step 1 is sequentially subjected to single-phase zone blanking at 100°C to 150°C above the phase transition point and two-phase zone forging at 30°C to 50°C below the phase transition point to obtain forged State TC4 titanium alloy blank;

[0051] Step 3: heat-treat the wrought TC4 titanium alloy billet obtained in step 2 at 800° C. for 1 hour, a...

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Abstract

The invention discloses a micro-alloying method capable of improving strength level of a TC4 titanium alloy. The micro-alloying method comprises the following steps: I, mixing and pressing 0-grade sponge titanium, an Al-V intermediate alloy, a Ti-Fe intermediate alloy, aluminum shots, TiO2 powder and B powder into an electrode, and performing vacuum self-consumable electric-arm smelting to obtaina TC4 titanium alloy cast ingot; II, sequentially performing single-phase-region cogging and two-phase-region forging on the TC4 titanium alloy cast ingot to obtain forged TC4 titanium alloy blank; and III, performing thermal treatment on the forged TC4 titanium alloy blank to obtain a TC4 titanium alloy. Mass percentage of O and Fe in the TC4 titanium alloy is controlled, B is added, and a melting point, on a solid-liquid interface, is reduced by utilizing low solubility, in TC4 titanium alloy melt, of B, so that B is dissolved into TC4 titanium alloy matrix, TC4 titanium alloy cast ingot crystalline grains are radically refined, and strength of TC4 titanium alloy is remarkably improved under the condition of not reducing plasticity of the TC4 titanium alloy.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, in particular to a microalloying method for improving the strength level of TC4 titanium alloys. Background technique [0002] Titanium alloys are widely used in aviation, aerospace, ships, weapons and other fields due to their excellent properties such as low density, high strength and corrosion resistance. With the continuous expansion of the application range of titanium alloys and the improvement of titanium alloy preparation technology, the requirements for titanium alloy performance indicators are becoming more and more stringent. According to different working conditions of titanium alloy applications, high temperature titanium alloys, high strength titanium alloys, corrosion resistant Titanium alloys and other types of titanium alloys with different characteristics. However, these titanium alloys often focus on highlighting a certain performance index of titanium alloys, and the c...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00C22C1/03
CPCC22C1/03C22C14/00C22F1/183
Inventor 贾蔚菊毛成亮李思兰应扬毛小南赵永庆
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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