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Titanium alloy with thin sheet layer microstructure and manufacturing method thereof

A technology of microstructure and manufacturing method, applied in the field of titanium-based alloys, can solve the problems of difficult process control and strict requirements for alloy composition uniformity.

Active Publication Date: 2011-02-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These structures have some advantages of lamellar structure and overcome their obvious shortcomings, but the process control is difficult and the requirements for the uniformity of alloy composition are strict

Method used

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  • Titanium alloy with thin sheet layer microstructure and manufacturing method thereof
  • Titanium alloy with thin sheet layer microstructure and manufacturing method thereof
  • Titanium alloy with thin sheet layer microstructure and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the following formula: Al 5.8Wt-%, Sn 4.0Wt-%, Zr 5.0Wt-%, Mo 0.40Wt-%, Si0.5Wt-%, Nb 0.4Wt-%, Ta 2.5Wt-%, C 0.05Wt -% and balance of Ti. Sponge titanium, pure aluminum, sponge zirconium and intermediate alloy are mixed and pressed into electrodes, put into a vacuum consumable electric arc furnace for vacuum melting to obtain titanium alloy ingots. The α+β / β transformation point T of the material is measured by metallographic method α+β / β =1040°C, silicide dissolution temperature T sol = 1055°C. After the ingot is cut off and the surface defects are removed, the billet is opened by a hydraulic press at 1150°C, and the ingot is opened at 1060°C (T α+β / β +20℃) to make a Φ120 billet with a hydraulic press or a forging hammer, and use a precision forging machine to forge a Φ32 precision forged bar in two fires, where the heating temperature of the first fire is 1010℃ (T sol -45,T α+β / β -30℃), the forging ratio is 4; the second fire heating temperature is 1...

Embodiment 2

[0041] According to the following formula: Al 5.8Wt-%; Sn 4.0Wt-%; Zr 6.5Wt-%; Mo 0.40Wt-%; Si0.4Wt-%; Nb 0.4Wt-%; Ta 2.5Wt-%; -% and balance of Ti. The smelting and thermal processing techniques are the same as in Example 1. The α+β / β transformation point T of the material is measured by metallographic method α+β / β =1033°C, silicide dissolution temperature T sol =1050°C, the heat treatment system adopted is 1035°C / 2h solid solution, air cooling, and 700°C / 2h aging heat treatment to obtain Figure 4 The fine lamellar structure shown in (a), Figure 4 (b) and (c) are two-state and coarse lamellar structures with the same composition (comparative example), and the heat treatment systems are 1005°C / 2h solid solution, air cooling, 700°C / 2h aging and 1065°C / 2h solid solution, air cooling+ 700℃ / 2h aging, air cooling. Figure 4 (c) The microstructure solution treatment temperature is at the silicide dissolution temperature T sol Above, there is no silicide at this temperature, ...

Embodiment 3

[0047] Adopt the same alloy composition and smelting process as in Example 2 to produce disc-shaped parts, after cutting off the cap and removing surface defects, enter the following processing steps: 1) blanking with a hydraulic press at 1200 ° C, the forging ratio is 2.25 , 2) at 1020°C (T sol -30) Heating, upsetting with a hydraulic press, the total forging ratio is 3.3, water quenching after forging; 3) heating at 1050°C (17°C above the α+β / β phase transition point), upsetting with a hydraulic press, the total forging Ratio of 4.1, water quenching after forging; 4) at 1020°C (T sol -30) Heating, upsetting and drawing with a hydraulic press, the total forging ratio is 3.3, water quenching after forging; 5) at 1010°C (T sol -40°C, T α+β / β -23°C) heating, hydraulic press for upsetting, the total forging ratio is 4.5, water quenching after forging; 6) heat treatment: 1040°C / 2h, oil quenching +700°C / 5h, air cooling. Its organization is fine lamellar microstructure, see appen...

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Abstract

The invention provides a titanium alloy with a thin sheet layer microstructure and a manufacturing method thereof. The titanium alloy is characterized in that: 1) a certain amount of Si element is added into the alloy so that Ti5Si3 or Ti2Si type silicide can be dissolved out from the alloy under a certain condition; 2) controlling the adding amount of alloying elements, namely Zr, Sn and beta stable elements, which affect the dissolving temperature of the silicide so as to guarantee that the alpha + beta / beta transformation temperature of the titanium alloy is lower than the dissolving temperature of the silicide; 3) fully deforming the alloy at the temperature of below the dissolving temperature of the silicide, and finally properly deforming the alloy in the alpha + beta phase area over 1 to 2 fire, wherein the primary beta crystallite dimension of the alloy after thermal treatment is less than 200 mu m and the alloy has a thin sheet lamellar structure. The invention also provides a titanium alloy component and a corresponding smelting, hot working and heat treatment process. The thin sheet layer titanium alloy of which the primary beta crystallite dimension of the alloy after thermal treatment is less than 200 mu m can be prepared by the process. The titanium alloy has relatively high strength and plastic toughness matching, is a high-strength, high-toughness and high-temperature resistant titanium alloy material and is expected to be well popularized and applied in the field of aerospace.

Description

Technical field: [0001] The invention belongs to the technical field of titanium-based alloys, and in particular relates to a titanium-based alloy with fine lamellar microstructure and a manufacturing method thereof. Background technique [0002] In order to meet the design requirements of reducing weight and increasing the thrust-to-weight ratio of aircraft, it is necessary to increase the amount of titanium alloy materials with high specific strength as much as possible. In recent years, the use of titanium alloys on aircraft at home and abroad has shown a significant increase. The use and level of titanium alloys have become an important indicator to measure the advanced level of aerospace technology and aircraft performance at home and abroad. [0003] Microstructure control technology is an important topic of common concern to titanium alloy design and users. There are three typical microstructures of titanium alloys: equiaxed structure, double state structure and lame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C1/02C22C14/00
Inventor 刘建荣王清江朱绍祥陈志勇刘羽寅杨锐高颀王鼎春李献民董长升何书林石卫民魏寿庸
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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