CN106011419A - Preparation method of high-strength high-toughness metal material based on pulse current phase-change effect - Google Patents
Preparation method of high-strength high-toughness metal material based on pulse current phase-change effect Download PDFInfo
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- CN106011419A CN106011419A CN201610527965.5A CN201610527965A CN106011419A CN 106011419 A CN106011419 A CN 106011419A CN 201610527965 A CN201610527965 A CN 201610527965A CN 106011419 A CN106011419 A CN 106011419A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
Abstract
The invention belongs to the technical field of processing of metal materials, and discloses a preparation method of a high-strength high-toughness metal material based on a pulse current phase-change effect. The preparation method comprises the following steps: carrying out high-temperature deformation on a metal cast ingot at the temperature of 800-850 DEG C; then carrying out high-temperature annealing treatment; carrying out non-pressure phase-change treatment on the annealed material on the basis of a pulse current effect by a spark plasma sintering system, wherein phase-change treatment pulse current strength is 1,400A-1,900A, and phase-change treatment temperature is higher than a temperature region of 40-100 DEG C of the phase inversion temperature of the metal material; and then obtaining the high-strength high-toughness metal material based on the pulse current phase-change effect. By the method disclosed by the invention, an optimal tissue structure is obtained, and plasticity of the metal material is greatly improved while the strength is high. The high-strength high-toughness metal material based on the pulse current phase-change effect can be applied to the fields of aviation, ships, sport equipment, medical instruments and the like.
Description
Technical field
The invention belongs to metal material processing technical field, be specifically related to a kind of based on pulse current cholesteric-nematic transition
The preparation method of high-toughness metal material.
Background technology
Under normal circumstances, grain size is contrary to the contribution of intensity and plasticity, which results in high intensity and
High-ductility is difficult to be concurrently present in structural metallic materials.Therefore, pursue the high Strengthening and Toughening of structural metallic materials,
It it is the most all the target of researcher effort.As a example by industrially pure titanium, as the light weight of a kind of advanced person
Changing structural metallic materials, pure titanium has that specific strength is high, heat-resist, excellent corrosion resistance and biocompatibility
Well wait outstanding advantages, be widely used in Aeronautics and Astronautics, boats and ships, defence equipment, chemical industry, medical treatment, energy
The fields such as source.But, the usage performance requirement researcher improved constantly updates preparation technology, with
Continue to optimize the structure of pure titanium, and then synchronize to improve its intensity and plasticity, to meet answering under more harsh conditions
With.Being at room temperature Patterns for Close-Packed Hexagonal Crystal structure due to pure titanium, this crystal structure symmetry is poor, and slip system is few,
Thus significantly reduce the plasticity of this material.Therefore, it is necessary to take the preparation technology improved to carry high purity titanium
Obdurability.
At present, commercial Application carries the most effective of high purity titanium comprehensive mechanical property and maturation method is that crystal grain is thin
Change.Wherein, Sever Plastic Deformation method is the most effective mode refining pure titanium crystal grain, mainly include Equal Channel Angular Pressing,
The technology such as cold rolling and high pressure.In the last few years, Equal Channel Angular Pressing and cold rolling two kinds of techniques were combined and prepared height
Tough pure titanium is the most increasingly by the favor of research workers.
But, due to the Patterns for Close-Packed Hexagonal Crystal construction features of pure titanium, refined by crystal grain merely that to improve it strong
Toughness tends not to play good effect.Literature search through prior art finds: V.V.Stolyarov
Deng once " Materials Science and Engineering A " reported for work about " ECAP extruding path to pure titanium microstructure and property
Can impact " paper (list of references 1, Influence of ECAP routes on the microstructure and
properties of pure Ti,Materials Science and Engineering A 299,2001,59-67).This grinds
Study carefully and show: after 1 grade of pure titanium TA1 carries out 8 passage Equal Channel Angular Pressing process, the tension of pure titanium TA1 is strong
Degree brings up to the 710MPa of Ultra-fine Grained (260nm) from the 460MPa of coarse-grain (10 μm), but extends
Rate but only has 14%.D.K.Yang etc. had once delivered one about " many by obtaining on " material academic periodical "
Mesostructure improves intensity and the plasticity of titanium simultaneously " paper (list of references 2, Simultaneously
enhanced strength and ductility of titanium via multimodal grain structure,Scripta
Materialia 63,2010,941-944).This research shows: cold rolling add 300 DEG C of insulations when pure titanium carries out 83%
Finding after 1h annealing, pure titanium tissue becomes Multi-scale model (50-200nm), and tensile strength brings up to 945MPa,
But elongation percentage is only 23%.
In view of this, researcher updates preparing technique process to put forward the plasticity of high purity titanium.As one
Plant novel powder activated sintering Technology, discharge plasma sintering (Spark Plasma Sintering, SPS)
It is a kind of material forming techniques collecting the THM coupling effects such as electric field, stress field and temperature field, this technology and heat
Pressure, high temperature insostatic pressing (HIP) are compared with pressureless sintering technology, have more obvious advantage: temperature is low, the time is short (only
Need a few minutes), rise gentle rate of temperature fall fast (the liter gentleness cooldown rate of the most hundreds of K/min can be provided),
Can effectively inhibiting grain growth, production efficiency high.But, how to be come by discharge plasma sintering technique
Control the phase in version of metal material, the heterogeneous microstructure of regulation metal material, and then obtain the intensity optimized
But report is rarely had with plasticity.
Summary of the invention
In place of solving the shortcoming and defect of above prior art, the primary and foremost purpose of the present invention is to provide one
Plant the preparation method of high-toughness metal material based on pulse current cholesteric-nematic transition.
Another object of the present invention is to provide a kind of by said method prepare based on pulse current phase
The high-toughness metal material of change effect.
The object of the invention is achieved through the following technical solutions:
The preparation method of a kind of high-toughness metal material based on pulse current cholesteric-nematic transition, including preparing as follows
Step:
(1) high temperature deformation processes: at 800 DEG C-850 DEG C, cast metals is carried out high temperature deformation, to obtain
Required form and size, the blank of crystal grain refinement；
(2) the high temperature anneal: the blank obtaining step (1) carries out the high temperature anneal, to realize
While eliminating residual stress, it is thus achieved that the isometric crystal structure material that crystal grain is evenly distributed；
(3) pulse current phase transformation processes: is loaded in mould by the material that step (2) annealing prepares, passes through
It is carried out based on pulse current effect without pressure phase transformation process by discharge plasma sintering system, obtains based on arteries and veins
Rush the high-toughness metal material of electric current cholesteric-nematic transition；It is concrete that the nothing pressure phase transformation of described pulse current effect processes
Technological parameter is as follows:
Pulse current equipment: discharge plasma sintering system；
Pulse current intensity: 1400A～1900A；
Phase transformation treatment temperature T: be approximately higher than metal material phase transition temperature 40 DEG C～the temperature range of 100 DEG C；As
ForThe pure titanium of ppolymorphism transition temperature 882 DEG C, 920 DEG C < T < 980 DEG C.
Preferably, the high temperature deformation described in step (1) includes any shape such as hot rolling, forge hot, hot extrusion
Become processing method.
Preferably, described in step (2), the high temperature anneal refers to isothermal holding at a temperature of 680～750 DEG C
After 1～2h, air cooling is to room temperature.
Preferably, described phase transformation number of processes is 1～3 time.As gone through pure titaniumPpolymorphism transition temperature
The number of times 1 of 882 DEG C～3 times.
Without pressure request: ensure that pulse current is directly through avoiding rod base to bear any pressure and (connect while rod base
Nearly 0MPa).
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition, is prepared by said method.
Described high-toughness metal material can be pure titanium or titanium alloy, pure iron or ferroalloy, pure cobalt or cobalt alloy
Etc. the metal material comprising phase in version；Gained high-toughness metal materials microstructure structure can be basket shape, layer
Lamellar, Widmannstatten structure, etc. the forms such as shaft-like.
Preferably, when described metal material is pure titanium, its tissue can be hcp α-Ti (its layer of lamellar structure
Sheet width range is 200 μm～650 μm), the hcp α-Ti (size is about 200 μm～300 μm) of Widmannstatten structure
Or the hcp α-Ti (size is about 50 μm～150 μm) of basket tissue.
Preferably, when described metal material is pure iron, its tissue can be that (size is about for the bcc α-Fe of lamellar
It is 100 μm-300 μm).
Above-mentioned high-toughness metal material based on pulse current cholesteric-nematic transition can be applicable to space flight and aviation, boats and ships,
Sports equipment and medical apparatus and instruments (such as heat exchanger, golf club, medical apparatus and instruments etc.).
The principle that pulse current phase transformation of the present invention processes is: high temperature deformation and the metal material of annealing
Without residual stress, crystal grain is refined, is evenly distributed, and is isometric crystal structure.Pulsed current annealing skill
Art has that the rate of heat addition is fast, efficiency advantages of higher, and the temperature field utilizing pulse current to produce makes metal material fast
Speed is warming up to more than its phase transition temperature, then allows material be quickly cooled to room temperature, or in metal material phase
Transition temperature carries out repeatedly circular treatment up and down.Often going through a phase in version, material will occur a forming core long
Big process, due to new nucleus preferentially at the grain boundaries forming core of original crystal grain, the most repeatedly phase in version will modulation
Go out different organizational structuries；Meanwhile, the non-thermal effect of pulse current acceleration atoms permeating will cause atom more normal
Long-range diffusion under the conditions of rule, and the texture orientation of material can be changed, as pure titanium { 0002} texture will be with
The long-range of atom spreads and weakens, andCrystal orientation will tend to the deflection of pulse current direction, and this will cause more
Slip system deflect to pulse current direction, thus will increase pulse current direction plasticity.It addition, pass through
Preferred process temperature and the regulation and control rate of heat addition also can change pulse current intensity.Therefore, factors above will cause
Metal material produces different phase in version organizational structuries, thus obtains intensity and the plasticity of optimization.
Preparation method and the obtained product of the present invention have the advantage that and beneficial effect:
(1) treatment technology based on pulse current cholesteric-nematic transition of the present invention and traditional Technology for Heating Processing side
Method is compared, have easy to operate, stock utilization is high, the course of processing is simple, efficiency is high, it is low etc. excellent to pollute
Point；Meanwhile, the size of metal material can be regulated and controled by mould size, surface cleaning.
(2) present invention uses the heat effect and non-thermal effect that discharge plasma sintering system pulses electric current produces,
Particularly through the phase transition temperature of metal material, it is processed, it is thus achieved that the knot of tissue of optimization
Structure, and then while obtaining higher-strength, the plasticity of metal material is greatly improved.
(3) present invention obtains metal material microscopic structure and mechanical property are controlled.The lamellar such as obtained
The pure titanium TA1 of tissue, while tensile strength reaches 568MPa, plastic strain is up to 43.2%, obdurability
Significantly larger than utilize the of the same race pure titanium material of the Sever Plastic Deformation PROCESS FOR TREATMENT such as Equal Channel Angular Pressing；For another example, it is thus achieved that
The pure iron material of lamellar structure, while tensile strength reaches 415MPa, plastic strain is up to 55%,
Obdurability significantly larger than utilizes the pure iron material of the same race of the Sever Plastic Deformation PROCESS FOR TREATMENT such as Equal Channel Angular Pressing.
(4) large scale, the high-toughness metal material comprehensive mechanical property that prepared by the present invention are good, and diameter can reach
15～30mm, substantially meet the application requirement as new structural material, Aero-Space, military project,
The fields such as boats and ships, sports equipment, medical apparatus and instruments have popularizing application prospect widely.
Accompanying drawing explanation
Fig. 1 is the sample assembling figure that in embodiment 1, pulse current phase transformation processes pure titanium TA1；
Fig. 2 is the microstructure picture figure of gained pure titanium TA1 after pulse current phase transformation processes in embodiment 1；
Fig. 3 is the stretching true stress-strain curve of pure titanium TA1 before and after pulse current phase transformation processes in embodiment 1
Figure.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but the embodiment party of the present invention
Formula is not limited to this.
Embodiment 1
(1) high temperature deformation process: use 1 grade of industrially pure titanium as raw material, by pure titanium TA1 ingot casting in 800 DEG C
Under carry out high temperature rolling, with obtain diameter 15mm, length 1000mm, crystal grain refinement blank；
(2) the high temperature anneal: the blank that step (1) is obtained be heated in the lehr 680 DEG C,
It is incubated and within 2 hours, carries out the high temperature anneal then air cooling to room temperature, to realize while eliminating residual stress,
Obtain the isometric crystal structure material that crystal grain is evenly distributed；
(3) pulse current phase transformation processes: use the material cutting that step (2) annealing is prepared by wire cutting machine
Become diameter 15mm, the cylindrical rod base of length 42mm, with ethanol, cylindrical rod base surface carried out ultrasonic waves for cleaning,
It is coated with graphite paper, is then charged in graphite jig (sample assembles such as Fig. 1), is evacuated down to 10-2Pa, fills
High-purity argon gas is protected, and then by discharge plasma sintering system, it is carried out nothing based on pulse current effect
Pressure phase transformation processes, and concrete requirement and technological parameter are as follows:
Pulse current equipment: Dr.Sintering SPS-825 discharge plasma sintering system；
Phase transformation treatment temperature T:T=980 DEG C；Pure titaniumPpolymorphism transition temperature is 882 DEG C；
Phase transformation number of processes: be warmed up to 780 DEG C for 8 minutes from room temperature and be incubated 1 minute, then with 200K/min
Heating rate be warmed up to 980 DEG C, last stove is as cold as room temperature.It is to say, go through pure titaniumHomoatomic is different
The number of times that allosteric transformation temperature is 882 DEG C is 1 time；
Rod base size: diameter 15mm, length 42mm, can prepare the stretching sample meeting GB/T 228-2002；
Without pressure request: ensure that pulse current is directly through avoiding rod base to bear any pressure and (connect while rod base
Nearly 0MPa).
Pulse current intensity: 1900A.
The most i.e. obtain a diameter of Φ 15mm, a length of 42mm pure titanium TA1 (if increase rod base
Diameter and length, it is thus achieved that pure titanium size is the biggest).The microstructure picture of gained pure titanium TA1 as in figure 2 it is shown,
Being observed by Fig. 2 and show, it is made up of the hcp α-Ti of lamellar structure, and (its synusia width range is
200 μm～650 μm)；The stretching true stress-strain curve of gained pure titanium TA1 is as it is shown on figure 3, by Fig. 3 table
Bright, pure titanium TA1 plasticity while keeping higher-strength that pulse current phase transformation processes is substantially improved, and it resists
Tensile strength and plastic strain are respectively 568MPa and 43.2%, are significantly larger than non-pulse current phase transformation and process (high
Temperature deformation increase temperature annealing) pure titanium (its tensile strength and plastic strain be respectively 520MPa and
29%).Meanwhile, the plastic strain value (43.2%) of the pure titanium TA1 that pulse current phase transformation processes is significantly larger than
The elongation percentage (only 14%) of Equal Channel Angular Pressing pure titanium TA1 in list of references 1, and cold in list of references 2
Roll and add the elongation percentage (only 23%) making annealing treatment pure titanium.
Embodiment 2
(1) high temperature deformation process: use 1 grade of industrially pure titanium as raw material, by pure titanium TA1 ingot casting in 800 DEG C
Under carry out high temperature rolling, with obtain diameter 15mm, length 1000mm, crystal grain refinement blank；
(2) the high temperature anneal: the blank that step (1) is obtained be heated in the lehr 680 DEG C,
It is incubated and within 2 hours, carries out the high temperature anneal then air cooling to room temperature, to realize while eliminating residual stress,
Obtain the isometric crystal structure material that crystal grain is evenly distributed；
(3) pulse current phase transformation processes: use the material cutting that step (2) annealing is prepared by wire cutting machine
Become diameter 15mm, the cylindrical rod base of length 42mm, with ethanol, cylindrical rod base surface carried out ultrasonic waves for cleaning,
It is coated with graphite paper, is then charged in graphite jig (sample assembles such as Fig. 1), is evacuated down to 10-2Pa, fills
High-purity argon gas is protected, and then by discharge plasma sintering system, it is carried out nothing based on pulse current effect
Pressure phase transformation processes, and concrete requirement and technological parameter are as follows:
Pulse current equipment: Dr.Sintering SPS-825 discharge plasma sintering system；
Phase transformation treatment temperature T:T=980 DEG C；Pure titaniumPpolymorphism transition temperature is 882 DEG C；
Phase transformation number of processes: be warmed up to 780 DEG C for 8 minutes from room temperature and be incubated 1 minute, with 100K/min's
Heating rate be warmed up to 980 DEG C, stove be cooled to 780 DEG C, be incubated 1 minute, with the liter of 100K/min at 780 DEG C
Temperature ramp to 980 DEG C, stove are cooled to 780 DEG C, then are incubated 1 minute, liter with 100K/min at 780 DEG C
Temperature ramp to 980 DEG C, last stove are as cold as room temperature, say, that go through pure titaniumPpolymorphism turns
The number of times that temperature is 882 DEG C is 3 times；
Rod base size: diameter 15mm, length 42mm, can prepare the stretching sample meeting GB/T 228-2002；
Without pressure request: ensure that pulse current is directly through avoiding rod base to bear any pressure and (connect while rod base
Nearly 0MPa).
Pulse current intensity: 1600A.
The most i.e. obtain a diameter of Φ 15mm, a length of 42mm pure titanium TA1 (if increase rod base
Diameter and length, it is thus achieved that pure titanium size is the biggest).Microstructure picture is observed and is shown, it is by Widmannstatten structure
Hcp α-Ti forms (size is about 200 μm～300 μm)；Stretching true stress-strain curve shows, pulse electricity
The pure titanium TA1 that stream phase transformation processes is keeping plasticity while higher-strength to be substantially improved, its tensile strength and moulding
Property strain be respectively 526MPa and 41%, be significantly larger than non-pulse current phase transformation process (high temperature deformation is increased
Temperature annealing) pure titanium (its tensile strength and plastic strain are respectively 520MPa and 29%).Meanwhile,
It is medium that the plastic strain value (41%) of the pure titanium TA1 that pulse current phase transformation processes is significantly larger than list of references 1
The elongation percentage (only 14%) of angular extrusion pure titanium TA1, and in list of references 2 cold rolling add annealing pure
The elongation percentage (only 23%) of titanium.
Embodiment 3
(1) high temperature deformation process: use 1 grade of industrially pure titanium as raw material, by pure titanium TA1 ingot casting in 850 DEG C
Under carry out high temperature forge hot, with obtain diameter 100mm, highly 100mm, crystal grain refinement blank；
(2) the high temperature anneal: the blank that step (1) is obtained be heated in the lehr 680 DEG C,
It is incubated and within 2 hours, carries out the high temperature anneal then air cooling to room temperature, to realize while eliminating residual stress,
Obtain the isometric crystal structure material that crystal grain is evenly distributed；
(3) pulse current phase transformation processes: use the material cutting that step (2) annealing is prepared by wire cutting machine
Become diameter 15mm, the cylindrical rod base of length 42mm, with ethanol, cylindrical rod base surface carried out ultrasonic waves for cleaning,
It is coated with graphite paper, is then charged in graphite jig (sample assembles such as Fig. 1), is evacuated down to 10-2Pa, fills
High-purity argon gas is protected, and then by discharge plasma sintering system, it is carried out nothing based on pulse current effect
Pressure phase transformation processes, and concrete requirement and technological parameter are as follows:
Pulse current equipment: Dr.Sintering SPS-825 discharge plasma sintering system；
Phase transformation treatment temperature T:T=920 DEG C；Pure titaniumPpolymorphism transition temperature is 882 DEG C；
Phase transformation number of processes: be warmed up to 780 DEG C for 8 minutes from room temperature and be incubated 1 minute, liter with 50K/min
Temperature ramp to 920 DEG C, last stove are as cold as room temperature, say, that go through pure titaniumPpolymorphism turns
The number of times that temperature is 882 DEG C is 1 time；
Rod base size: diameter 15mm, length 42mm, can prepare the stretching sample meeting GB/T 228-2002；
Without pressure request: ensure that pulse current is directly through avoiding rod base to bear any pressure and (connect while rod base
Nearly 0MPa).
Pulse current intensity: 1400A.
The most i.e. obtain a diameter of Φ 15mm, a length of 42mm pure titanium TA1 (if increase rod base
Diameter and length, it is thus achieved that pure titanium size is the biggest).Microstructure picture is observed and is shown, it is organized by basket
Hcp α-Ti forms (size is about 50 μm～150 μm)；Stretching true stress-strain curve shows, pulse electricity
The pure titanium TA1 that stream phase transformation processes is keeping plasticity while higher-strength to be substantially improved, its tensile strength and moulding
Property strain be respectively 568MPa and 36.7%, be significantly larger than non-pulse current phase transformation process (high temperature deformation is increased
Temperature annealing) pure titanium (its tensile strength and plastic strain are respectively 520MPa and 29%).Meanwhile,
It is medium that the plastic strain value (36.7%) of the pure titanium TA1 that pulse current phase transformation processes is significantly larger than list of references 1
The elongation percentage (only 14%) of angular extrusion pure titanium TA1, and in list of references 2 cold rolling add annealing pure
The elongation percentage (only 23%) of titanium.
Embodiment 4
(1) high temperature deformation processes: the pure iron of employing purity >=99.9% is as raw material, by pure iron ingot casting in 850 DEG C
Under carry out high temperature forge hot, with obtain diameter 15mm, highly 1000mm, crystal grain refinement blank；
(2) the high temperature anneal: the blank that step (1) is obtained be heated in the lehr 750 DEG C,
It is incubated and within 1 hour, carries out the high temperature anneal then air cooling to room temperature, to realize while eliminating residual stress,
Obtain the isometric crystal structure material that crystal grain is evenly distributed；
(3) pulse current phase transformation processes: use the material cutting that step (2) annealing is prepared by wire cutting machine
Become diameter 15mm, the cylindrical rod base of length 42mm, with ethanol, cylindrical rod base surface carried out ultrasonic waves for cleaning,
It is coated with graphite paper, is then charged in graphite jig (sample assembles such as Fig. 1), is evacuated down to 10-2Pa, fills
High-purity argon gas is protected, and then by discharge plasma sintering system, it is carried out nothing based on pulse current effect
Pressure phase transformation processes, and concrete requirement and technological parameter are as follows:
Pulse current equipment: Dr.Sintering SPS-825 discharge plasma sintering system；
Phase transformation treatment temperature T:T=960 DEG C；Pure ironPpolymorphism transition temperature is 912 DEG C；
Phase transformation number of processes: be warmed up to 760 DEG C for 7 minutes from room temperature and be incubated 1 minute, with 200K/min's
Heating rate be warmed up to 960 DEG C, last stove be as cold as room temperature, say, that go through pure ironPpolymorphism
The number of times that transition temperature is 912 DEG C is 1 time；
Rod base size: diameter 15mm, length 42mm, can prepare the stretching sample meeting GB/T 228-2002；
Without pressure request: ensure that pulse current is directly through avoiding rod base to bear any pressure and (connect while rod base
Nearly 0MPa).
Pulse current intensity: 1800A.
The most i.e. obtain a diameter of Φ 15mm, a length of 42mm pure iron (if increase rod base diameter
And length, it is thus achieved that pure iron size is the biggest).Microstructure picture is observed and is shown, it is by the bcc α-Fe of lamellar
Composition (size is about 100 μm-300 μm)；Stretching true stress-strain curve shows, at pulse current phase transformation
The pure iron of reason plasticity while keeping higher-strength is substantially improved, and its tensile strength and plastic strain are respectively
415MPa and 55%, its intensity processes (high temperature deformation increases temperature annealing) with non-pulse current phase transformation
Pure iron is suitable, and plasticity is significantly larger than the pure iron (22%) that non-pulse current phase transformation processes, and comprehensive mechanical property is big
Width improves.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-mentioned reality
Execute the restriction of example, the change made under other any spirit without departing from the present invention and principle, modification,
Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (10)
1. the preparation method of a high-toughness metal material based on pulse current cholesteric-nematic transition, it is characterised in that
Including following preparation process:
(1) high temperature deformation processes: at 800 DEG C-850 DEG C, cast metals is carried out high temperature deformation, to obtain
Required form and size, the blank of crystal grain refinement；
(2) the high temperature anneal: the blank obtaining step (1) carries out the high temperature anneal, to realize
While eliminating residual stress, it is thus achieved that the isometric crystal structure material that crystal grain is evenly distributed；
(3) pulse current phase transformation processes: is loaded in mould by the material that step (2) annealing prepares, passes through
It is carried out based on pulse current effect without pressure phase transformation process by discharge plasma sintering system, obtains based on arteries and veins
Rush the high-toughness metal material of electric current cholesteric-nematic transition；It is concrete that the nothing pressure phase transformation of described pulse current effect processes
Technological parameter is as follows:
Pulse current equipment: discharge plasma sintering system；
Pulse current intensity: 1400A～1900A；
Phase transformation treatment temperature T: higher than metal material phase transition temperature 40 DEG C～the temperature range of 100 DEG C.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 1
Preparation method, it is characterised in that: the high temperature deformation described in step (1) includes in hot rolling, forge hot, hot extrusion
Any deformation process method.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 1
Preparation method, it is characterised in that: described in step (2), the high temperature anneal refers to 680～750 DEG C of temperature
After lower isothermal holding 1～2h, air cooling is to room temperature.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 1
Preparation method, it is characterised in that: described phase transformation number of processes is 1～3 time.
5. a high-toughness metal material based on pulse current cholesteric-nematic transition, it is characterised in that: pass through right
Require that the method described in 1～4 any one prepares.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 5,
It is characterized in that: described high-toughness metal material is pure titanium or titanium alloy, pure iron or ferroalloy, pure cobalt or cobalt
Alloy；High-toughness metal materials microstructure structure be basket shape, lamellar, Widmannstatten structure or etc. shaft-like.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 5,
It is characterized in that: gained high-toughness metal material is pure titanium, it is organized as the hcp α-Ti of lamellar structure, Wei
Hcp α-the Ti or the hcp α-Ti of basket tissue of family name's tissue.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 7,
It is characterized in that: the synusia width range of the hcp α-Ti of described lamellar structure is 200 μm～650 μm；Institute
The size of the hcp α-Ti stating Widmannstatten structure is 200 μm～300 μm；The chi of the hcp α-Ti of described basket tissue
Very little is 50 μm～150 μm.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 5,
It is characterized in that: gained high-toughness metal material is pure iron, it is organized as the bcc α-Fe of lamellar.
A kind of high-toughness metal material based on pulse current cholesteric-nematic transition the most according to claim 9,
It is characterized in that: the size of the bcc α-Fe of described lamellar is 100 μm～300 μm.
Priority Applications (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110129701A (en) * | 2019-06-24 | 2019-08-16 | 合肥工业大学 | A kind of method of refractory metal recrystallization annealing |
| CN112941441A (en) * | 2021-01-29 | 2021-06-11 | 武汉理工大学 | Method for regulating and controlling local texture of rolled titanium alloy by pulse current |
| CN113416906A (en) * | 2021-05-24 | 2021-09-21 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Process for preparing titanium alloy bar blank by combining extrusion cogging and pulse current heat treatment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129701A (en) * | 2019-06-24 | 2019-08-16 | 合肥工业大学 | A kind of method of refractory metal recrystallization annealing |
| CN110129701B (en) * | 2019-06-24 | 2021-05-04 | 合肥工业大学 | Method for recrystallization annealing of refractory metal |
| CN112941441A (en) * | 2021-01-29 | 2021-06-11 | 武汉理工大学 | Method for regulating and controlling local texture of rolled titanium alloy by pulse current |
| CN112941441B (en) * | 2021-01-29 | 2022-05-24 | 武汉理工大学 | Method for regulating and controlling local texture of rolled titanium alloy by pulse current |
| CN113416906A (en) * | 2021-05-24 | 2021-09-21 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Process for preparing titanium alloy bar blank by combining extrusion cogging and pulse current heat treatment |
| CN113416906B (en) * | 2021-05-24 | 2022-01-28 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Process for preparing titanium alloy bar blank by combining extrusion cogging and pulse current heat treatment |
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| CN106011419B (en) | 2018-01-02 |
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