CN104889186B - A kind of positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted - Google Patents
A kind of positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted Download PDFInfo
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- CN104889186B CN104889186B CN201510339125.1A CN201510339125A CN104889186B CN 104889186 B CN104889186 B CN 104889186B CN 201510339125 A CN201510339125 A CN 201510339125A CN 104889186 B CN104889186 B CN 104889186B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 46
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 42
- 239000000956 alloy Substances 0.000 title claims abstract description 42
- 230000005684 electric field Effects 0.000 title claims abstract description 13
- 150000001875 compounds Chemical class 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000007493 shaping process Methods 0.000 claims abstract description 19
- 238000004826 seaming Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 4
- 239000010439 graphite Substances 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000011068 loading method Methods 0.000 claims description 5
- 229910001093 Zr alloy Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 235000012438 extruded product Nutrition 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910002059 quaternary alloy Inorganic materials 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Extrusion Of Metal (AREA)
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Abstract
A kind of positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted, it mainly loads alloy blank in the cavity of shaping, mould is put into progress heating extruding in discharging plasma sintering equipment again, temperature is 750 DEG C~850 DEG C, final extrusion molding pressure is 50~60kN, and the flow stress of deformation is less than 30MPa.Shaping dies includes：Upper lower cushion block, upper push-down head, die sleeve and mould, upper cushion block are located at the top surface of seaming chuck, and seaming chuck is placed in the die sleeve corresponding with its shape of section, seaming chuck is circular projection with blank contact portion, push-down head is identical with seaming chuck, and symmetrically placed, and lower cushion block is then located at push-down head bottom；The material of the shaping dies is high strength graphite, and shaping dies, which is placed on discharging plasma sintering equipment, realizes positive and negative Compound Extrusion shaping.The present invention can improve the plasticity and toughness of ZrTiAlV alloys, realize that alloy low temperature crushing failure at high speed shapes under electric field-assisted state.
Description
The present invention relates to a kind of plastic processing method of alloy for technical field.
Background technology Zr base noncrystal alloys can reach 2GPa superhigh intensity and high rigidity, wear-resisting, corrosion-resistant etc. excellent
A kind of different physical and chemical performance, it is considered to be structural material of great potential.But the industrialization of current Zr base noncrystal alloys should
With very big difficulty is faced with, such as plastic deformation ability is very poor, critical dimension is smaller, can only prepare the component and very of simple shape
Hardly possible is machined, and significantly limit its commercial Application.
ZrTiAlV quaternary alloys are that structural material Material Field develops one of more rapid zircaloy kind.Liu Ping
Deng having synthesized 47Zr-45Ti-5Al-3V (47Zr), 30Zr-62Ti-5Al-3V (30Zr), 20Zr-69.5Ti-6.5Al- first
Three kinds of alloys such as 4V (20Zr), and the performance after forging state, annealed state and solution treatment is conducted in-depth research, it is determined that
Under various regimes, as a result basic mechanical performance and microstructure that material possesses show, the ZrTiAlV of three kinds of compositions
Alloy all has excellent mechanical property.The intensity of 47Zr alloys reaches as high as 1638MPa, and the tensile strength of 30Zr alloys is maximum
1622MPa can be reached, the maximum tensile strength of 20Zr alloys is then up to 1740MPa；Ensureing the feelings of elongation after fracture not small 5%
Under condition, by appropriate heat treatment, the intensity of 47Zr alloys reaches as high as 1327MPa, and elongation percentage is 12.2%, 30Zr alloys
Tensile strength can reach 1335MPa, and elongation percentage is that 8.4%, 20Zr alloy strengths can reach 1437MPa, but elongation percentage is only
6.7%.
Intensity just because of ZrTiAlV quaternary alloys is very high, so it is more difficult to cause it to shape.Through research hair
Now when electric current is by the metal that is being plastically deformed, drift electron can apply certain promotion to the dislocation in metal
Power, helps dislocation to cross advancing obstacle, so as to improve the plasticity and toughness of deformable metal.Electric field-assisted extrusion forming process
The deformation temperature and resistance of deformation of material are exactly reduced using this principle, the rate of deformation of material is improved, improves its microcosmic
Tissue and mechanical property.
The content of the invention is it is an object of the invention to provide a kind of plasticity and toughness that can improve deformable metal, relatively low
The lower positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloy electric field-assisteds realized of temperature.
Technical scheme is as follows：
1st, ZrTiAlV alloys electric field-assisted backward and forward extrusion mould
The shaping dies of the present invention is mainly included：Upper cushion block, lower cushion block, seaming chuck, push-down head, die sleeve and mould, should
The material of shaping dies is high strength graphite.Wherein, upper cushion block is located at the top surface of cylindricality seaming chuck, and seaming chuck is placed in section and its
In the corresponding tubular die sleeve of shape, seaming chuck is the less circular projection of size, push-down head and seaming chuck with blank contact portion
Identical and symmetrically placed, lower cushion block is then located at cylindricality push-down head bottom；Above-mentioned shaping dies is placed on into discharge plasma sintering to set
Positive and negative Compound Extrusion shaping is carried out to ZrTiAlV alloys on standby.
2nd, the positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted
1) extrusion chamber volume is precalculated, and calculates block blank size, bar-shaped zircaloy is precisely cut,
Obtain extrusion billet；
2) alloy blank is loaded in the cavity between the upper and lower pressure head of above-mentioned shaping dies and die sleeve；
3) above-mentioned mould is put into progress heating extruding in discharging plasma sintering equipment, first applies minimum before heating
Contact 10kN, is vacuumized simultaneously, and vacuum is 10-3On-load voltage is 5V, maximum load electric current between MPa, upper push-down head
Between 3000~4000A, the extrusion temperature of alloy starts at 750~850 DEG C when in-furnace temperature is close to setting extrusion temperature
Slow pressurization, final extrusion molding pressure is 50~60kN, and the flow stress of deformation is less than 30MPa, passed through in extrusion process
Push-down head, which passively feeds force, shapes extruded product；
4) when equipment walking displacement is close calculates displacement, and displacement is not changed, then alloy block material has been extruded
Into, stopping heating, and unloaded；
5) extrusion cools with stove, after after mould cooling, takes out mold for extruding and forming, upper and lower mould is opened, take out extruding
The part of shaping.
The present invention has the following advantages that compared with prior art：
1st, shaped using electric field-assisted backward and forward extrusion, when making electric current by the ZrTiAlV alloys that will be plastically deformed,
Targeted electronic in electric field can apply certain motive force to the dislocation in zirconium metal, help dislocation to cross advancing obstacle,
Reach the effect of the plasticity and toughness that improve ZrTiAlV alloys, so as to promote the rate of deformation of material, improve its microstructure with
Mechanical property.
2nd, the temperature range of electric field-assisted backward and forward extrusion deformation is 750 DEG C~850 DEG C, and this is than being forged into that non-electric field is aided in
Shape temperature reduces by 200 DEG C or so, and the flow stress of deformation is less than 30MPa, can realize under electric field-assisted state alloy in mould
Low temperature crushing failure at high speed shapes.
3rd, extrusion molding is carried out in discharge sintering equipment, gained extruded product does not produce overlap, with good table
Face pattern, realizes the near net extrusion molding of product.
Brief description of the drawings
Fig. 1 is the structure schematic diagram of mold for extruding and forming of the present invention.
Embodiment
In mold for extruding and forming schematic diagram shown in Fig. 1, upper cushion block 1 is located at the top surface of cylindrical seaming chuck 2, the seaming chuck
Bottom is placed in the cylindrical shape die sleeve 3 corresponding with its shape of section, and seaming chuck lower end contact alloy blank 4 is identical with seaming chuck
The top of push-down head 5 also touch alloy blank, its lower end is placed in the top of lower cushion block 6, and the material of above-mentioned shaping dies is high-strength
Spend graphite.
Embodiment 1
Extrusion chamber volume is precalculated, and calculates block blank size, by diameter 41mm bar-shaped 47Zr alloys profit
High 34mm block blanks are precisely cut into wire cutting, this blank is loaded between the above-mentioned upper and lower pressure head of shaping dies and die sleeve
Cavity in, and above-mentioned mould is put into discharge plasma sintering stove progress heating extruding.First apply before heating minimum
Contact 10kN, heating process is vacuumized simultaneously, and vacuum is 10-3On-load voltage is 5V between MPa, upper push-down head, maximum
Loading current is in 4000A, and the extrusion temperature of alloy is 850 DEG C.When temperature rises to 800 DEG C, start slow pressurization, it is final to squeeze
Pressing formation pressure is 50kN, and the flow stress of deformation is less than 30MPa；When equipment walking displacement is close calculates displacement, and displacement
Do not change, then alloy block material extruding is completed, and stops heating, and unloaded.Extrusion cools with stove, treats that mould is cold
But after, mold for extruding and forming is taken out, upper and lower mould is opened, take out the part of extrusion molding.47Zr extrusions are carried out to analyze it
Crystallite dimension is changed into 350 μm or so of uniform equiaxed grain structure by original 350~400 μm.
Embodiment 2：
Extrusion chamber volume is precalculated, and calculates block blank size, by diameter 41mm bar-shaped 30Zr alloys profit
High 34mm block blanks are precisely cut into wire cutting, this blank is loaded between the above-mentioned upper and lower pressure head of shaping dies and die sleeve
Cavity in, and above-mentioned mould is put into discharge plasma sintering stove progress heating extruding.First apply before heating minimum
Contact 10kN, heating process is vacuumized simultaneously, and vacuum is 10-3On-load voltage is 5V between MPa, upper push-down head, maximum
Loading current is in 3500A, and the extrusion temperature of alloy is 800 DEG C.When temperature rises to 750 DEG C, start slow pressurization, it is final to squeeze
Pressing formation pressure is 55kN, and the flow stress of deformation is less than 30MPa；When equipment walking displacement is close calculates displacement, and displacement
Do not change, then alloy block material extruding is completed, and stops heating, and unloaded.Extrusion cools with stove, treats that mould is cold
But after, mold for extruding and forming is taken out, upper and lower mould is opened, take out the part of extrusion molding.30Zr extrusions are carried out to analyze it
Crystallite dimension is changed into 300 μm or so of uniform equiaxed grain structure by original 300~350 μm.
Embodiment 3：
Extrusion chamber volume is precalculated, and calculates block blank size, by diameter 41mm bar-shaped 20Zr alloys profit
High 34mm block blanks are precisely cut into wire cutting, this blank is loaded between the above-mentioned upper and lower pressure head of shaping dies and die sleeve
Cavity in, and above-mentioned mould is put into discharge plasma sintering stove progress heating extruding.First apply before heating minimum
Contact 10kN, heating process is vacuumized simultaneously, and vacuum is 10-3On-load voltage is 5V between MPa, upper push-down head, maximum
Loading current is in 3000A, and the extrusion temperature of alloy is 750 DEG C.When temperature rises to 700 DEG C, start slow pressurization, in extruding
During passively fed and exert a force and using the loading method of continuous pressurization-pressurize, final extrusion molding pressure is by push-down head
60kN, the flow stress of deformation is less than 30MPa；When equipment walking displacement is close calculates displacement, and displacement does not change, then
Alloy block material extruding is completed, and stops heating, and unloaded.Extrusion cools with stove, after after mould cooling, takes out extruding
Shaping dies, upper and lower mould is opened, and takes out the part of extrusion molding.47Zr extrusions analyze its crystallite dimension by original
400~450 μm, be changed into 400 μm or so of uniform equiaxed grain structure.
Claims (1)
1. a kind of positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted, it is characterised in that：
(1) extrusion chamber volume is precalculated, and calculates block blank size, bar-shaped zircaloy is precisely cut, obtained
To extrusion billet；
(2) alloy blank is loaded in the cavity between the upper and lower pressure head of shaping dies and die sleeve；The shaping dies includes：On
Cushion block, lower cushion block, seaming chuck, push-down head, die sleeve, wherein, upper cushion block is located at the top surface of cylindricality seaming chuck, and seaming chuck is placed in section
In tubular die sleeve corresponding with its shape, seaming chuck is circular projection with blank contact portion, and push-down head is identical with seaming chuck, and
Symmetrically placed, lower cushion block is then located at cylindricality push-down head bottom, and the material of the shaping dies is high strength graphite；
(3) above-mentioned mould is put into progress heating extruding in discharging plasma sintering equipment, first applies minimum before heating and connect
Touch pressure 10kN, is vacuumized simultaneously, and vacuum is 10-3On-load voltage is 5V between MPa, upper push-down head, and loading current is 3000
Between~4000A, the extrusion temperature of alloy starts slow add at 750~850 DEG C when in-furnace temperature is close to setting extrusion temperature
Pressure, final extrusion molding pressure is 50~60kN, and the flow stress of deformation is less than 30MPa, passes through push-down head in extrusion process
Passive feeding force shapes extruded product；
(4) when equipment walking displacement is close calculates displacement, and displacement is not changed, then alloy block material extruding is completed,
Stop heating, and unloaded；
(5) extrusion cools with stove, after after mould cooling, takes out mold for extruding and forming, upper and lower mould is opened, take out extrusion molding
Part.
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| CN201510339125.1A CN104889186B (en) | 2015-06-18 | 2015-06-18 | A kind of positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted |
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| CN104889186B true CN104889186B (en) | 2017-09-22 |
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| CN101670385A (en) * | 2009-08-31 | 2010-03-17 | 哈尔滨工业大学 | Pulse current assisted extrusion forming device and extrusion forming method |
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| JP3136460B2 (en) * | 1994-11-02 | 2001-02-19 | 新日本製鐵株式会社 | Linear orbital shaft excellent in fatigue strength and surface properties and method for producing the same |
| CN101273150B (en) * | 2005-09-29 | 2010-10-06 | 京瓷株式会社 | Sintered body and die for hot extrusion molding each using such sintered body |
| CN101234401B (en) * | 2008-03-06 | 2010-12-08 | 中北大学 | Magnesium alloy automobile wheel extrusion molding method and mold |
| CN104451259A (en) * | 2014-11-13 | 2015-03-25 | 内蒙古工业大学 | Method for preparing zirconium alloy by sintering discharge plasma |
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| CN101670385A (en) * | 2009-08-31 | 2010-03-17 | 哈尔滨工业大学 | Pulse current assisted extrusion forming device and extrusion forming method |
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