CN105149369A - New preparing method for high-strength nanocrystalline titanium alloy pipe - Google Patents
New preparing method for high-strength nanocrystalline titanium alloy pipe Download PDFInfo
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- CN105149369A CN105149369A CN201510525822.6A CN201510525822A CN105149369A CN 105149369 A CN105149369 A CN 105149369A CN 201510525822 A CN201510525822 A CN 201510525822A CN 105149369 A CN105149369 A CN 105149369A
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Abstract
The invention discloses a new preparing method for a high-strength nanocrystalline titanium alloy pipe. The method is characterized in that a high-strength thin-wall pipe material can be prepared with low cost to replace a thick-wall pipe material, and after a round mold channel is adopted to draw the titanium alloy pipe one time, severe plastic deformation of the titanium alloy pipe can be achieved, finally, large deformation is accumulated, and the high-strength nanocrystalline titanium alloy pipe is obtained. Through a designed round channel drawing mold, a double-layer prestress sleeve ring structure is adopted to greatly improve the strength of the round channel mold, and the service life of the mold is prolonged; the titanium alloy tube is full of a tin melt, so that transverse-section distortion of the pipe material in the drawing process of the round mold channel is avoided; and meanwhile, the pipe material is well refined under two-direction stress, the mechanical property of the titanium alloy pipe is further improved, and on the premise that the high density is ensured, the higher strength and the good toughness are achieved.
Description
Technical field
The present invention relates to a kind of molding field of metal pipe material, particularly by " own " type channel die, realized the nanometer of titanium alloy tube material by drawing process, relate to a kind of method and the mould of preparing the brilliant titanium alloy tube of high-strength nano.
Background technology
At present, titanium alloy is mainly used in the applications such as aerospace field, nuclear power and medical treatment, wherein titanium alloy metal pipe material possesses firm, corrosion resistant characteristic, there is higher mechanical property, excellent punching performance, and can various forms of welding be carried out, strength of welded joint can reach 90% of parent metal intensity, and machinability is good.Titanium pipe has higher corrosion resisting property to chloride, sulfide and ammonia.Titanium corrosion resistance is in the seawater also higher than aluminium alloy, stainless steel, nickel-base alloy.Titanium is water-fast, and impact property is also stronger.Therefore, titanium alloy tube obtains important application in aerospace field and nuclear power field.Adopt extrusion technique can prepare small-diameter thick-walled tubing, the method adopts bar casting-bar to heat and hot extrusion-rolling and stretch forming, complex procedures, and energy consumption is high.Adopt welding method can prepare heavy caliber thick wall tubing, the method is energy-efficient, reduce operation, but there is weld metal zone and heat affected area in welding procedure itself, and aerospace field and nuclear power field high to safety requirements, therefore, the forming technique of current titanium alloy tube constrains the further application of titanium alloy tube in aerospace field and nuclear power field.
Application publication number is that the invention of CN102626724A adopts that two rollers are cold rolling and three rollers are cold rolling and vacuum annealing process obtains titanium alloy tube, application publication number is that the invention of CN102974645A is by upsetting pull blank, roughing and finish rolling obtain titanium alloy tube, foregoing invention is traditional roll forming process, can not obtain the nanometer of titanium alloy tube material.Application number be 20110347299.4 and 201110374700.3 invention propose a kind of for tubing etc. channel variable cross-section extruding and the method for drawing, by by circle-ellipse-round and oval torsional variation, buildup of material can be made to be out of shape, the intensity of material can be improved, improve pipe performance, but adopt the method to change the cross section of die channel, the pipe fitting of acquisition can not keep original cross-sectional geometry of pipeline preferably.
The present invention proposes one " own " type curved channel mould Hubbing method, adopt the method can obtain the brilliant titanium alloy tube of high-strength nano of endless size in theory, simultaneously owing to being original cross-sectional geometry that a kind of iso-cross-section channel deformation can keep pipeline, the low processing cost preparing light-wall pipe can be met, high strength linepipe can be obtained again, the use of Some substitute thick-walled pipe.Therefore, the present invention proposes a kind of " own " type curved channel mould hubbing improving titanium alloy tube mechanical property and obtain nanocrystalline high strength titanium alloy pipe.
Summary of the invention
The object of the invention is: for overcoming the strength problem of thin-wall titanium alloy pipe, the novel preparation method of the brilliant titanium alloy tube of a kind of high-strength nano is provided, there is provided a kind of by " own " type curved channel mould hubbing, low cost can obtain the nanocrystalline titanium alloy tube of longer dimension high-strength.
The method that one " own " the type curved channel mould hubbing that the present invention proposes prepares the nanocrystalline titanium alloy tube of long size titanium alloy tube comprises the following steps:
Step one, pipe prepares: the pipe by drawing is divided into two parts, and Part I is tube-drawing end portion: this part, by heal seal, arranges titanium alloy wire clips head in port part simultaneously; Part II is the main drawing part of tubing: this part will obtain large sstrain, and tissue reaches nanometer, the mechanical property that final acquisition is excellent; Titanium alloy tube to one end sealing injects tin melt and cools, and can obtain solid titanium alloy tube, avoid the distortion of cross section producing tubing in the distortion of step 2 by the method.
Step 2, drawing prepares: after pipe is carried out phosphatization saponification, at outer surface of tube blank coating molybdenum bisuphide and mineral wax mixture, the titanium alloy wire clips head of the Part I of ready pipe is connected with the steel wire tow line of draw-off gear, then under titanium alloy wire wire saws, pipe is put into " own " type curved channel mould.
Step 3, drawing deformation: pipe is passed through the drawing of " own " type curved channel mould with the hauling speed of 5mm/s-20mm/s by draw-off gear, can accumulate enough strains by a drawing, thus obtain the brilliant titanium alloy tube of high-strength nano.
Step 4, obtain tubing: acquisitions high-strength nano crystalline substance titanium alloy tube drawing end portion to be upwards vertically placed in heating tank roasting to 230 ° one hour, tin metal packing material is heated and all melts outflow, the tin material flowed out can Reusability, titanium alloy tube has carried out stress relief annealing simultaneously, obtains the brilliant titanium alloy tube of high-strength nano of good mechanical performance.
The present invention realizes " own " type curved channel mould of titanium alloy tube drawing deformation, comprises circular channel die, ground floor prestressing force gland, second layer prestressing force gland, and corresponding appurtenances steel wire clamp and steel wire rope.
The invention has the beneficial effects as follows: adopt this kind of scheme, by " own " type curved channel mould drawing twice deformation method drawing titanium alloy tube, inner filling tin metal material simultaneously, compression is applied to titanium alloy tube inwall and can ensure that the shape of titanium alloy tube cross section in drawing process and size do not change, the method can realize the microstructure nanometer of titanium alloy tube, thus the brilliant titanium alloy tube of the high-strength nano of excellent." own " type curved channel mold foundation achieves the continuous drawing distortion of titanium alloy tube, had both achieved the nanometer of tube wall metal, and alleviated again the labour intensity handling workman, widened the range of application of thin-wall titanium alloy pipe.
Accompanying drawing explanation
Here is described in detail specific embodiment of the invention scheme in conjunction with the accompanying drawings and embodiments.
Fig. 1 is the simple schematic diagram of processing technology of the present invention;
Fig. 2 is the present invention's " own " type curved channel mould drawing process installation drawing;
The extruded sample transmission electron microscope micrograph that Fig. 3 obtains;
Fig. 4 is the load-deformation curve of drawing pipes sample.
Being labeled as in above-mentioned figure:
Fig. 1 is 1. circular channel dies of the simple schematic diagram of processing technology of the present invention, 2. extrusion pipe;
Fig. 2 is 1. circular channel dies of the present invention's " own " type curved channel mould drawing process installation drawing, 2. extrusion pipe, 3. ground floor die prestressing force lasso, 4. second layer die prestressing force lasso, 5. dop, 6. steel wire rope, 7. pre-stress die base.
Detailed description of the invention
The novel preparation method of the brilliant titanium alloy tube of embodiment, a kind of high-strength nano
Pipe by drawing is pulled out end portion heal seal, steel wire clamp is set in port part simultaneously; Titanium alloy tube to one end sealing injects tin melt and cools, and can obtain solid titanium alloy tube by the method.After pipe is carried out phosphatization saponification, at outer surface of tube blank coating molybdenum bisuphide and mineral wax mixture, the ready steel wire clamp of pipe Part I is connected with the steel wire rope of draw-off gear, then under rope traction, pipe is put into " own " type curved channel mould, pipe once can be accumulated enough strains by " own " type curved channel mould drawing deformation with the hauling speed of 8mm/s by draw-off gear, then brilliant for acquisition high-strength nano titanium alloy tube drawing end portion to be upwards vertically placed in heating tank after roasting to 230 ° insulation one hour, tin metal packing material is heated and all melts outflow, also tackle titanium alloy tube simultaneously mutually and carry out stress relief annealing technique, obtain the brilliant titanium alloy tube of high-strength nano of good mechanical performance.
Can find out that the average crystal grain tissue of titanium alloy tube is the nano material being less than 400nm from the nanocrystalline titanium alloy drawing pipes sample transmission electron microscope micrograph shown in Fig. 3.From the nanocrystalline copper drawing pipes sample stretching true stress-true strain curve shown in Fig. 4, can find out, intensity comparatively conventional specimen improves 119%, and according to Hall-Pech formula, the crystallite dimension of material is less, and its external macro-mechanical property is higher.
Visible, the average crystal grain tissue of nanocrystalline titanium alloy drawing pipes sample is the nano material being less than 400nm, and its nanocrystalline copper drawing pipes probe intensity comparatively conventional specimen improves 119%.
The brilliant titanium alloy tube of a kind of high-strength nano provided by the invention can adopt simple wire drawing process equipment, and the material of acquisition has high hardness and intensity, keeps good toughness simultaneously.Therefore, material of the present invention has potential using value, has good advantage especially in Aeronautics and Astronautics and nuclear power field.
" own " of the present invention type curved channel mould structure; all prior art can be adopted; the present invention is not limited to above-mentioned cited concrete form of implementation, and all those skilled in the art, without the getable improvement of creative work, all belong in protection scope of the present invention.
Claims (3)
1. the novel preparation method of the brilliant titanium alloy tube of high-strength nano, low cost can prepare the use of high-strength thin-walled tubing replacement thick-wall tube, it is characterized in that: by the severe plastic deformation adopting " own " type channel die drawing titanium alloy tube once can realize titanium alloy tube, final accumulation large deformation, obtains the brilliant titanium alloy tube of high-strength nano.
2. the novel preparation method of the brilliant titanium alloy tube of a kind of high-strength nano according to claim 1, it is characterized in that: the steel wire clamp of pipe Part I is connected with the steel wire rope of draw-off gear, then under rope traction, pipe is put into " own " type curved channel mould, pipe once can be accumulated enough strains by " own " type curved channel mould drawing deformation with the hauling speed of 8mm/s by draw-off gear.
3. the novel preparation method of the brilliant titanium alloy tube of a kind of high-strength nano according to claim 1, it is characterized in that: the average crystal grain tissue of nanocrystalline titanium alloy drawing pipes sample is the nano material being less than 400nm, its nanocrystalline copper drawing pipes probe intensity comparatively conventional specimen improves 119%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510525822.6A CN105149369A (en) | 2015-08-25 | 2015-08-25 | New preparing method for high-strength nanocrystalline titanium alloy pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510525822.6A CN105149369A (en) | 2015-08-25 | 2015-08-25 | New preparing method for high-strength nanocrystalline titanium alloy pipe |
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| CN105149369A true CN105149369A (en) | 2015-12-16 |
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| CN201510525822.6A Pending CN105149369A (en) | 2015-08-25 | 2015-08-25 | New preparing method for high-strength nanocrystalline titanium alloy pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157949A (en) * | 2019-07-10 | 2019-08-23 | 山东建筑大学 | A kind of method of the channel pressings such as universal circle preparation nanometer beta-titanium alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033816A (en) * | 1983-08-02 | 1985-02-21 | Kobe Steel Ltd | Drawing method by floating plug |
| US4788841A (en) * | 1987-11-18 | 1988-12-06 | Aluminum Company Of America | Method and apparatus for making step wall tubing |
| CN2690067Y (en) * | 2003-12-21 | 2005-04-06 | 大连理工大学 | Magnesium alloy wire drawing device |
| CN103639215A (en) * | 2013-12-06 | 2014-03-19 | 山东建筑大学 | Method for preparing high-strength nanocrystalline copper pipe |
-
2015
- 2015-08-25 CN CN201510525822.6A patent/CN105149369A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033816A (en) * | 1983-08-02 | 1985-02-21 | Kobe Steel Ltd | Drawing method by floating plug |
| US4788841A (en) * | 1987-11-18 | 1988-12-06 | Aluminum Company Of America | Method and apparatus for making step wall tubing |
| CN2690067Y (en) * | 2003-12-21 | 2005-04-06 | 大连理工大学 | Magnesium alloy wire drawing device |
| CN103639215A (en) * | 2013-12-06 | 2014-03-19 | 山东建筑大学 | Method for preparing high-strength nanocrystalline copper pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157949A (en) * | 2019-07-10 | 2019-08-23 | 山东建筑大学 | A kind of method of the channel pressings such as universal circle preparation nanometer beta-titanium alloy |
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Application publication date: 20151216 |
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