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Processing and preparing method for high-strength high-precision Ti6Al4V titanium alloy tube

A titanium alloy, high-precision technology, applied in the field of processing and preparation of high-strength and high-precision Ti6Al4V titanium alloy pipes, can solve the problems of low precision and insufficient performance of Ti6Al4V titanium alloy pipes, and achieve good surface quality, excellent plasticity, and wall thickness The effect of high uniformity

Inactive Publication Date: 2018-06-01
西安赛特思迈钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for processing and preparing high-strength and high-precision Ti6Al4V titanium alloy pipes to solve the problems of insufficient performance and low precision of Ti6Al4V titanium alloy pipes in the prior art

Method used

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Examples

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preparation example Construction

[0016] The invention discloses a method for processing and preparing high-strength and high-precision Ti6Al4V titanium alloy pipes, specifically following the steps below:

[0017] Step 1, forging a Ti6Al4V titanium alloy billet with a uniform and fine structure, and obtaining a Ti6Al4V titanium alloy billet with a uniform and fine structure Φ50-100mm×Lmm through a high-low-high multi-fire forging process; wherein, the weight percentage of the Al element is 6.0 % to 6.5%, and the weight percentage of V element is 4.0% to 4.5%. %.

[0018] Step 2. Use a box-type resistance furnace to heat and keep the titanium alloy billet in step 1 in the β-phase region. The temperature range is: 1000-1250°C, and the holding time is 30-120min; The heated titanium alloy billet is pierced into a tube blank of Φ52~105mm×5~10mm×Lmm (that is, rolled into a tube blank).

[0019] Step 3. Heat-treat the tube billet rolled in step 2. The heat treatment is solid solution + aging treatment, wherein the...

Embodiment 1

[0024] The alloy composition of the pipe is Al 6.3%, V 4.1%, O 0.18%, Fe 0.20%. Through the high-low-high multi-fire forging process, the uniform and fine Ti6Al4V titanium alloy billet Φ80×850mm is obtained, and then the billet is heated to 1000°C in a box-type resistance furnace, and the holding time is 60min; it is pierced by two-roll cross rolling The machine process becomes a tube blank of Φ82×59×1550mm; then the tube blank is subjected to solution aging heat treatment (solution temperature 950°C, heat preservation for 60 minutes, water cooling after exiting the furnace, aging temperature 550°C, heat preservation for 240 minutes, air cooling after exiting the furnace); seven-roll heating The Φ76×61.2×1520mmTi6Al4V titanium alloy pipe was prepared after straightening, machining, flaw detection and other processes.

[0025] The mechanical properties of the Ti-6Al-4V titanium alloy tube are as follows:

[0026] state

Embodiment 2

[0028] The alloy composition of the pipe is Al 6.3%, V 4.2%, O 0.16%, Fe 0.18%. Through the high-low-high multi-fire forging process, the uniform and fine Ti6Al4V titanium alloy billet Φ60×900mm is obtained, and then the billet is heated to 1000°C in a box-type resistance furnace, and the holding time is 60min; it is pierced by two-roll cross rolling The machine process becomes a tube blank of Φ62×45×1200mm; then the tube blank is subjected to solution aging heat treatment (solution temperature 950°C, heat preservation for 60 minutes, water cooling after exiting the furnace, aging temperature 550°C, heat preservation for 240 minutes, and air cooling after exiting the furnace); seven-roll heating The Φ55×39×1155mm Ti6Al4V titanium alloy pipe was prepared after straightening, machining, flaw detection and other processes. The mechanical properties of the Ti-6Al-4V titanium alloy tube are as follows:

[0029] state

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Abstract

The invention discloses a processing and preparing method for a high-strength high-precision Ti6Al4V titanium alloy tube. The processing and preparing method comprises the following steps of: forginga Ti6Al4V titanium alloy bar billet with a uniform and fine tissue, adopting a box type resistance furnace to heat and preserve heat for the titanium alloy bar billet in a beta-phase area; rolling theheated titanium alloy bar billet into a tube billet through an oblique-rolling perforating machine; performing thermal treatment on the rolled bar billet, and performing thermal straightening by a straightening machine; and performing boring treatment on the inner surface of the thermally straightened tube billet, thereby obtaining the finished product titanium alloy tube. Through control on titanium alloy chemical components, especially interstitial elements O and Fe, large-deformation forging and rolling, reasonable heating and rolling temperature selection during processing and follow-up stress-relief annealing, the Ti6Al4V tube can obtain high strength; and thermal straightening and machining parameters are reasonably controlled, so that the prepared tube is good in surface quality, is high in wall thickness uniformity, and is excellent in plasticity; and the method is especially suitable for production of medium-specification high-strength Ti6Al4V titanium alloy tubes.

Description

【Technical field】 [0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a method for processing and preparing high-strength and high-precision Ti6Al4V titanium alloy pipes. 【Background technique】 [0002] Titanium and titanium alloys have the advantages of high specific strength, high temperature resistance, corrosion resistance, high toughness, low density, wide operating temperature range and good fatigue resistance, especially excellent corrosion resistance, and can be used in most acids and alkalis , Salt and seawater and marine environments are not corrosive. Ti6Al4V titanium alloy has excellent comprehensive properties, and its good process plasticity and superplasticity are suitable for various pressure forming. It is widely used in military industry, nuclear industry, aerospace, marine industry, petroleum refining, chemical industry and other fields. Various parts for offshore oil machinery. [0003] The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C14/00C22F1/18
CPCB23P15/00C22C14/00C22F1/002C22F1/183
Inventor 杨晓康魏芬绒金旭丹杨宏进崔文俊毛江虹罗斌莉
Owner 西安赛特思迈钛业有限公司
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