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Preparation method for high-strength, high-plasticity and high-precision beta titanium alloy pipe

A β-titanium alloy, high-precision technology, applied in the field of preparation of high-strength, high-plastic and high-precision β-titanium alloy pipes, can solve the problems of difficult to achieve warm rolling of high-strength titanium alloy pipes, achieve uniform and fine microstructure, reduce yield strength, Evenly organized effect

Active Publication Date: 2018-05-18
西安秦钛智造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In foreign countries, warm rolling is mainly used for the preparation of high-strength titanium alloy pipes. However, the warm rolling equipment in my country is relatively backward, and it is difficult to realize the warm rolling of high-strength titanium alloy pipes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of the present embodiment comprises the following steps:

[0019] Step 1. Mix and press zero-grade sponge titanium and HZr-1 grade zirconium sponge, aluminum beans, Al-60% Mo, Ti-80Sn, JCr99-A grade Cr, Fe nails and Al-70% Nb to form an electrode block, and then The electrode block is welded into an electrode, and the electrode is placed in a vacuum consumable electric arc furnace and smelted three times to obtain a β titanium alloy ingot of Φ460mm; the β titanium alloy ingot is composed of the following mass percentage: Al 5.1% , Mo 4.1%, Cr 4%, Zr 3.8%, Sn 2.2%, Fe 1.7%, Nb 3.3%, the balance is Ti and unavoidable impurities, among which impurity elements C≤0.03% in β titanium alloy ingot, N ≤0.03%, H ≤0.015%, O ≤0.13%;

[0020] Step 2. Forging the Φ460mm β titanium alloy ingot obtained in step 1 by forging the β phase region to form a billet of 300mm×300mm. The billet is subjected to three upsetting and three drawing at 830°C Roll into a bille...

Embodiment 2

[0025] The preparation method of the present embodiment comprises the following steps:

[0026]Step 1. Mix and press zero-grade sponge titanium and HZr-1 grade zirconium sponge, aluminum beans, Al-60% Mo, Ti-80Sn, JCr99-A grade Cr, Fe nails and Al-70% Nb to form an electrode block, and then The electrode block is welded into an electrode, and the electrode is placed in a vacuum consumable electric arc furnace and smelted three times to obtain a Φ460mm β titanium alloy ingot; the β titanium alloy ingot is composed of the following mass percentage: Al 5 %, Mo 4%, Cr 2%, Zr 4%, Sn 2%, Fe 1.5%, Nb 3%, the balance is Ti and unavoidable impurities, the balance is Ti and unavoidable impurities, of which β titanium alloy Impurity elements C ≤ 0.03%, N ≤ 0.03%, H ≤ 0.015%, O ≤ 0.13% in the ingot;

[0027] Step 2. Forging the Φ460mmβ titanium alloy ingot obtained in step 1 by forging the β-phase region to form a billet of 300mm×300mm. Φ190mm billet, and then use a drilling machine to ...

Embodiment 3

[0032] The preparation method of the present embodiment comprises the following steps:

[0033] Step 1. Mix and press zero-grade sponge titanium and HZr-1 grade zirconium sponge, aluminum beans, Al-60% Mo, Ti-80Sn, JCr99-A grade Cr, Fe nails and Al-70% Nb to form an electrode block, and then The electrode block is welded into an electrode, and the electrode is placed in a vacuum consumable electric arc furnace and smelted three times to obtain a β titanium alloy ingot of Φ460mm; the β titanium alloy ingot is composed of the following mass percentage: Al 5.5% , Mo 4.5%, Cr 1.5%, Zr 3.5%, Sn 2.5%, Fe 1%, Nb 2%, the balance is Ti and unavoidable impurities, among which impurity elements C≤0.03% in β titanium alloy ingot, N ≤0.03%, H ≤0.015%, O ≤0.13%;

[0034] Step 2. Forging the Φ460mmβ titanium alloy ingot obtained in step 1 by forging the β-phase region to form a billet of 300mm×300mm. Φ230mm billet, and then the billet is processed into an extruded tube billet with an outer...

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Abstract

The invention discloses a preparation method for a high-strength, high-plasticity and high-precision beta titanium alloy pipe. The preparation method comprises the steps that firstly, raw materials are mixed and pressed into electrode blocks, the electrode blocks are welded into an electrode, and the electrode is smelted into a beta titanium alloy ingot; secondly, the beta titanium alloy ingot issubjected to beta phase region cogging forging and thus a square billet is formed, after upsetting and drawing are conducted for three or more times, rounding is conducted and thus a bar billet is formed, and the bar billet is machined into an extruded pipe billet; thirdly, the extruded pipe billet is extruded and then subjected to solution treatment, cogging rolling and finish rolling are conducted, and thus a semi-finished beta titanium alloy pipe is obtained; and fourthly, the semi-finished beta titanium alloy pipe in the third step is subjected to solution treatment and aging treatment, then precision machining is conducted, and thus the beta titanium alloy pipe is obtained. The beta titanium alloy pipe prepared through the preparation method is uniform in alloy structure, fine in grain size, uniform in wall thickness and good in straightness, and the results of the mechanical properties of the beta titanium alloy pipe show that the beta titanium alloy pipe has high strength and high plasticity and meanwhile also has better size precision.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy pipe preparation, and in particular relates to a preparation method of high-strength, high-plasticity and high-precision beta titanium alloy pipe. Background technique [0002] β-type titanium alloys generally have high specific strength and low elastic modulus, and at the same time have high toughness, high fatigue limit, and excellent cold and hot workability, easy forging, and better strength can be obtained through solution aging treatment. Plastic matching. It is widely used in aerospace, ships, biomedical and other fields, and is one of the important structural materials. Among the existing titanium alloys, due to the different application goals of the initial design and development, there are very few β-titanium alloys suitable for preparing pipes, and after heat treatment, they can only reach a strength level of about 1200MPa. Due to the characteristics of large deformation resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C14/00B21C37/06C22F1/18
CPCB21C37/06C22C1/03C22C14/00C22F1/183
Inventor 曾立英戚运莲杜宇赵彬辛社伟周伟李倩赵恒章刘伟孙花梅张思远
Owner 西安秦钛智造科技有限公司
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