CN107435093A - The super intensified method of constrained transition and the technique strengthened based on this method to pure iron or mild steel - Google Patents
The super intensified method of constrained transition and the technique strengthened based on this method to pure iron or mild steel Download PDFInfo
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- CN107435093A CN107435093A CN201610361302.0A CN201610361302A CN107435093A CN 107435093 A CN107435093 A CN 107435093A CN 201610361302 A CN201610361302 A CN 201610361302A CN 107435093 A CN107435093 A CN 107435093A
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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
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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
- C22F1/16—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
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Abstract
The technique strengthened the invention discloses a kind of super intensified method of constrained transition and based on this method to pure iron or mild steel, this method includes a, the sample after processing is heated within the section of material phase transformation temperature, b, and then to the comprehensive 1 ~ 5GPa of pressurization of sample, c, 3 ~ 60min is incubated on the pressure spot of selection, d, the pressure value of selection, release when reaching room temperature are maintained during cooling at random；Or 1 ~ 5GPa super-pressure is loaded before heating.In above-mentioned technical proposal, by limit the volumetric expansion in phase transition process and fully by phase transformation internal stresses release in material internal, substantial amounts of lattice defect and nano twin crystal are formd, has carried out intensive treatment according to the method described above by taking pure iron or mild steel as an example, its dislocation density is about 1016~1017/m2, 4 ~ 10 times are improved than undressed ferrous materials hardness, is hardening and the application developing new approaches of material.
Description
Technical field
The invention belongs to the technical field strengthened to metal material, and in particular to a kind of super intensified method of constrained transition
With the technique strengthened based on this method to pure iron or mild steel.
Background technology
The defects of many performances of metal material are without the dislocation, the twin that are not dependent on inside.Solid-state phase changes（Such as martensitic phase
Become）The essential reason of strengthening material is to generate highdensity crystal defect.The nanometer material risen since last century the eighties
Material and severe plastic deformation are also intended to raising defect concentrations in crystals.
But enhanced type solid-state phase changes wait to optimize, for example require quickly to cool down, be difficult to strengthen pure iron, low-carbon martensite
Intensity is not high, high carbon martensite fracture toughness is poor etc..Using large plastometric set organization of regulation control structure there is also weak point, than
As energy transformation ratio is very low（1-10%）, also occur the saturation of crystal defect accumulation during Large strain.
Crystal defect type stress size and change, applied stress improve cause crystal defect to be changed into by dislocation
Deformation twins, and internal stress also causes dislocatrion martensite to be changed into twin crystal martensite with the increase of carbon content.It is outer compared to artificial
Add stress, internal stress caused by phase transformation belongs to natural present, and it, which is used, can then turn into effective and low-energy environment-friendly
Crystal defect regulation and control resource.
Turn in solid-state phase changes with internal stress caused by changes in crystal structure, face-centred cubic structure or close-packed hexagonal structure
It is changed into body-centered cubic structure with 6% volumetric expansion, the volumetric expansion that tetragonal is changed into diamond lattic structure is even as high as
20%.But for a long time, internal stress caused by phase transformation is discharged in vain in natural process, not only is not used for adjusted and controlled excellent
Change performance（Such as pure iron）, sample deformations and cracking caused by high internal stress（Such as martensitic traoformation）It is also regarded as unfavorable factor and sets
Method avoids.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of super intensified method of constrained transition and based on this method pair
The technique that pure iron or mild steel are strengthened, it is released internal stress caused by phase transformation by volumetric expansion caused by Complete Bind phase transformation
It is placed in the lattice of metal material, so as to form substantial amounts of lattice defect in crystals, produces substantial amounts of dislocation density, significantly
Improve the intensity of material.
In order to solve the above technical problems, the technical solution adopted by the present invention 1 is：
A kind of super intensified method of constrained transition, this method include the combination of high pressure and high-temperature technology means, this method
Step includes：
A, the sample after processing is heated to more than material phase transformation temperature,
B, and then to the comprehensive 1 ~ 5GPa of pressurization of sample,
C, 3 ~ 60min is incubated on the pressure spot of selection,
D, the pressure value of selection, release when reaching room temperature are maintained during cooling at random.
Present invention also offers another technical scheme 2
A kind of super intensified method of constrained transition, this method include the combination of high pressure and high-temperature technology means, this method
Step includes：
A, to the comprehensive 1 ~ 5GPa of pressurization of sample after processing,
B, maintain pressure value that sample is heated to more than phase transition temperature, be incubated 3 ~ 60min,
C, pressure value is maintained at random until being down to room temperature, release.
Above two technical scheme is used for the intensive treatment of metallic iron, tin or manganese, or for Pattern Bainite Alloy steel, pearlite
The intensive treatment of steel or albronze.These materials have common feature：When temperature is increased to more than transformation temperature, volume contracting
Small, when from transformation temperature greenhouse cooling, the volume of material expands again, is reached by the volumetric expansion in Complete Bind temperature-fall period
The purpose of strengthening material intensity.
Based on above-mentioned technical proposal 1, the invention provides technical scheme 3：
A kind of technique strengthened to pure iron or mild steel, including the melting of raw material, the homogenization of steel ingot, sample processing and strong
Change, process above comprises the following steps：
A, the melting of raw material：According to the formula of the mild steel of ingot iron or carbon content less than 0.2wt.%, calculate ingredient proportion,
And it is smelted into steel ingot；
B, the post processing of steel ingot：It is heat-treated 1 ~ 10 hour under the conditions of steel ingot in step A is maintained at into 1000 DEG C ~ 1200 DEG C, so
After be transferred to room temperature, in water quenching pool homogeneous complete solution treatment；
C, the processing of sample：By the steel ingot cogging after solution treatment in step B, sample is processed into according to design requirement；
D, the reinforcing of sample：Sample is heated to 750 ~ 1100 DEG C, after soaking, is put into jack unit, it is forced into 1 in 3 ~ 30s ~
5GPa, sample is down to room temperature, unloading pressure naturally.
Based on above-mentioned technical proposal 2, the invention provides technical scheme 4：
A kind of technique strengthened to pure iron or mild steel, including the melting of raw material, the homogenization of steel ingot, sample processing and strong
Change, process above comprises the following steps：
A, the melting of raw material：It is less than 0.2wt.% mild steel formula according to pure iron or carbon content, calculates ingredient proportion and melting
Into steel ingot；
B, the post processing of steel ingot：It is heat-treated 1 ~ 10 hour under the conditions of steel ingot in step A is maintained at into 1000 DEG C ~ 1200 DEG C, so
After be transferred to room temperature, in water quenching pool homogeneous complete solution treatment；
C, the processing of sample：By the steel ingot cogging after solution treatment in step B, sample is processed into according to design requirement；
D, the intensive treatment of sample：1 ~ 5GPa height is loaded to each face consistent of sample by the mode of physical compression
Pressure, maintain pressure value that sample is heated into 750 ~ 1100 DEG C, be incubated 3 ~ 60min, then maintain pressure value that sample is natural at random
It is down to room temperature, release.
Preferably, in the step D of above-mentioned technical proposal 3 or 4, when sample is naturally cooling into 300 ~ 600 DEG C, heat-insulation pressure keeping
5 ~ 300 minutes, then sample is down to room temperature, release.
Present invention also offers a kind of the high rigidity pure iron or mild steel prepared based on technical scheme 3 or 4, the pure iron or
Mild steel middle position dislocation density is 1016~1017/m2。
In above-mentioned technical proposal 1 ~ 4, internal stress caused by phase transformation is taken full advantage of first and forms density in crystals
For 1016~1017/ m2The defects of, the hardness of pure iron is improved 10 times.Illustrating its general principle by taking ferrous materials as an example is：Steel
Volume-diminished 6 ~ 20% after iron material is heated to more than phase transition temperature, the phase transformation recovery of ferrous materials, the mistake in temperature-fall period
Volume can expand in journey, if the volumetric expansion of pressurization limitation ferrous materials in this process, internal stress caused by because of phase transformation
It is released in inside ferrous materials, so as to produce a large amount of defects in intracell.
Intensive treatment has been carried out to the mild steel of ingot iron and phosphorus content less than 0.2% using above-mentioned technical proposal.Knot
Fruit shows：The hardness of ingot iron has brought up to 10 times and has reached 800HV.
It is using beneficial effect caused by above-mentioned technical proposal：（1）The present invention is by limiting the volume in phase transition process
Expand fully by phase transformation internal stresses release inside ferrous materials, form a large amount of dislocations and nano twin crystal, dislocation density is about
For 1016~1017/m2, the size of nano twin crystal is less than 20nm, 4 ~ 10 times improved than undressed ferrous materials hardness；（2）
The less ferrous materials of hardness are processed into the sample for meeting design requirement, then carried out according to the technique of the present invention at reinforcing
Reason, you can directly generate the larger finished parts of hardness, be on the one hand easily worked before intensive treatment, on the other hand pass through the present invention
Method strengthen after can be used directly, be expected to the contradiction for solving between hardness and difficulty of processing, be ferrous materials hardening with should
With developing new approaches.
Brief description of the drawings
Fig. 1 is the pure iron without intensive treatment and the pure iron sample after 3GPa, 965 DEG C and 720 DEG C of intensive treatments
XRD analysis figure；
Fig. 2 is pure iron and compared using the microhardness value for comparing sample after example 2 ~ 5 is strengthened；
Fig. 3 is that the microhardness value for comparing sample in example 6 and embodiment 1 ~ 4 compares；
Fig. 4 a and 4b are TEM figure and lattice analysis chart of the sample after reinforcing in embodiment 3 respectively；
Fig. 5 a and Fig. 5 b are the TEM figures and crystallite dimension statistical chart of the sample after 98% large deformation in comparative example 4 respectively；
Fig. 6 a and Fig. 6 b are the TEM figures and crystallite dimension statistical chart after 3.5-5GPa high pressure torsions in comparative example 5；
Fig. 7 is the XRD analysis figure of embodiment 6 ~ 8 and comparative example 7；
Fig. 8 is the metallograph of the sample without reinforcing；
Fig. 9 ~ 11 are the sample TEM figures after reinforcing in embodiment 6 ~ 8 respectively；
Figure 12 is comparative example 7 and the hardness test comparison chart of the sample of embodiment 6 ~ 8.
Embodiment
The super intensified method of constrained transition in the present invention, include the step of this method：
A, the sample after processing is heated to more than material phase transformation temperature 5 ~ 200 DEG C, method of the invention is adapted to processing heating phase
Volume-diminished after change, cooling phase transformation recovery, the material of volumetric expansion, such as the intensive treatment of metallic iron, tin or manganese, or for bayesian
The intensive treatment of body steel alloy, pearlitic steel or albronze.The phase transition temperature of each material can be according to the data of prior art
It is determined that.Preferably, 5 ~ 200 DEG C are heated to more than phase transition temperature in step a.
B,, can be with the side of design outline six, internal and examination according to the shape of sample and then to the comprehensive 1 ~ 5GPa of pressurization of sample
The open-close type pressurization punching block of sample shape and size matching.
C, 3 ~ 60min is incubated on the pressure spot of selection, the purpose of insulation is to realize that temperature and phase transformation are uniform.
D, the pressure value of selection, release when reaching room temperature are maintained during cooling at random.Random pressurize in temperature-fall period
Make to apply pressure to sample all the time, limit its volumetric expansion.
Also another scheme, comprises the following steps：
A, to the comprehensive 1 ~ 5GPa of pressurization of sample after processing,
B, maintain pressure value that sample is heated to more than phase transition temperature into 5 ~ 200 DEG C, be incubated 3 ~ 60min,
C, pressure value is maintained at random until being down to room temperature, release.Apply the pressure value of setting to sample i.e. when starting to warm up,
And remain that the pressure value is constant.
The above method is illustrated with reference to specific embodiment.
Embodiment 1
A, the melting of raw material：According to the formula of following ingot irons（Mass fraction %）, calculate ingredient proportion and be smelted into steel ingot,
0.0025C, 0.01Si, 0.09Mn, 0.009P, 0.005S, 0.125Al, surplus Fe.
B, the post processing of steel ingot：It is heat-treated 5 hours under the conditions of steel ingot in step A is maintained at into 1100 DEG C ~ 1150 DEG C, so
After be transferred to room temperature, in water quenching pool homogeneous complete solution treatment.
C, the processing of sample：By the steel ingot cogging after solution treatment in step B, 5mm × 5mm × 5mm small side is cut into
Block polishes smooth as sample, specimen surface.In other embodiments, sample can also cut into design requirement as needed
Shape, supporting comprehensive jack unit is set.
D, the reinforcing of sample：Sample in step C is fitted into six face pressure machines, 3GPa is forced into, then sample heats up
To 787 DEG C, temperature and pressure 30min is kept, sample is down to room temperature, unloading pressure naturally.
In embodiment 2 ~ 4, sample is warming up to 887 DEG C, 965 DEG C and 1050 DEG C respectively；As a comparison case, in step D
The sample of pressurization is warming up to 720 DEG C.
In order to be compared with existing reinforcement process, the sample in the present embodiment after step C processing is taken as parallel
Sample, comparative testing below example is separately designed, referring to table 1.
The test method and condition of the comparative example of table 1
By obtained sample in step C（Annealed state, without intensive treatment）Distinguish with the sample in embodiment 3 and comparative example 1
XRD analysis are carried out, its result shows referring to Fig. 1：Sample through 3GPa, 965 DEG C of intensive treatments is not undergone phase transition, that is, is heated
After more than to phase transition temperature, sample is undergone phase transition, and in temperature-fall period, does not prevent phase transformation from restoring because restricted volume expands,
Phase transformation internal stresses release forms substantial amounts of lattice defect in pure iron lattice.
By the sample of intensive treatment in sample after intensive treatment in embodiment 1 ~ 4 and comparative example 1 ~ 6, it is respectively adopted micro- hard
Spend instrument and carry out hardness test, 200 grams of test force, 10 seconds dwell times, as a result respectively referring to table 1 and Fig. 2 ~ Fig. 3.
Result above shows：The present invention is to the intensive treatment significant effect of sample better than other reinforcing sides in the prior art
Method.By applying 3GPa high pressure in embodiment 4, and after being heated to the intensive treatment that cools after 1050 DEG C, the intensity of pure iron
Highest is improved to HV863, is 9-10 times of pure iron hardness；It is that currently a popular cold rolling large deformation (deflection is more than 98%) produces
2.5-3 times of intensity effect, be saturation dependent variable（Dependent variable 100）Strengthen effect 2.1-2.7 times.
TEM and crystal grain chi are carried out respectively to the sample of 98% deflection cold rolling intensive treatment and high pressure torsion intensive treatment
Very little statistical analysis, referring to Fig. 5 a, b and Fig. 6 a, b：Nano-crystalline Fe is obtained by the cold rolling of 98% deflection, average grain size is
99nm；The intensive treatment of high pressure torsion forms nano-crystalline Fe, average grain size 87.1nm；Show：After intensive treatment
The nano-crystalline Fe of formation greatly improves than pure iron hardness.But the intensive treatment of the large deformation amount has to the raising of pure iron intensity
Limit.Fig. 4 a and b are TEM figure and lattice analysis chart of the sample after reinforcing in embodiment 3 respectively, as can be seen from the figure：Through about
Intensive treatment after beam phase transformation generates highdensity dislocation, while forms highdensity nano twin crystal, the chi of nano twin crystal
It is very little to be less than 20nm；Hardness results show that its hardness is 8 ~ 9 times of pure iron hardness, strengthen means more than existing large deformation
Added with effect.
Embodiment 5
It is essentially identical with the technique of embodiment 1, the difference is that sample is cut into 100mm × 20mm × 5mm in step C；
Step D, the reinforcing of sample：Sample is heated to 1000 DEG C first, keeps temperature 30min, it is then quick in 3 ~ 30s
To sample by way of physical compression, to each face uniform pressurization to 5GPa, and the pressure is always maintained at, then sample is natural
It is down to room temperature, unloading pressure.
XRD analysis are carried out to the sample of the present embodiment, the results showed that：Compared with pure iron, do not undergo phase transition.Microhardness is surveyed
Test result is HV725 ~ 760；Tem analysis is shown：Highdensity dislocation is generated in lattice, while forms highdensity nanometer
Twin.
Embodiment 1 ~ 5 shows, does not undergo phase transition recovery as long as not cooling also, either applies super-pressure before high-temperature phase-change,
Still super-pressure is applied after undergoing phase transition again, obtained reinforcing effect is suitable.
Embodiment 6 ~ 8
A, the melting of raw material：According to the formula of following mild steel（Mass fraction %）, calculate ingredient proportion and be smelted into steel ingot,
0.20C, 0.32Si, 0.47Mn, 0.027P, 0.024S, surplus Fe.
B, the post processing of steel ingot：It is heat-treated 3 hours under the conditions of steel ingot in step A is maintained at into 1050 DEG C ~ 1150 DEG C, so
After be transferred to room temperature, in water quenching pool homogeneous complete solution treatment.
C, the processing of sample：By the steel ingot cogging after solution treatment in step B, 5mm × 5mm × 5mm small side is cut into
Block polishes smooth as sample, specimen surface.
D, the reinforcing of sample：Sample in step C is fitted into six face pressure machines, 3GPa is forced into, then sample heats up
To 1050 DEG C, temperature and pressure 30min is kept, sample is down to room temperature, unloading pressure naturally.
In embodiment 7 ~ 8, as different from Example 6, it is 1GPa and 5GPa respectively to strengthen pressurization.
In order to be compared with existing reinforcement process, the sample in the present embodiment after step C processing is taken as parallel
Sample, carry out brine hardening intensive treatment, i.e. comparative example 7.
The sample of embodiment 6 ~ 8 and comparative example 7 is subjected to XRD analysis, as a result referring to Fig. 7.As can be seen from Figure 7：
Sample after the processing of embodiment 6 ~ 8 is not undergone phase transition compared with the mild steel that brine hardening is handled；I.e. through 1GPa,
The volumetric expansion caused by because of phase transformation of 3GPa and 5GPa constraint samples, does not influence to drop to the phase of sample in chilling process from high temperature
Become and restore, phase transformation internal stresses release may form substantial amounts of lattice defect, be analyzed by TEM in steel lattice.Ginseng
See Fig. 8, be the metallographic structure photo of the sample without reinforcing, as can be seen from the figure：Original structure without reinforcing is iron element
Body and pearlite, ferritic crystallite dimension are 20 ~ 40 microns；Fig. 9 ~ 11 are the sample after reinforcing in embodiment 6 ~ 8 respectively
TEM schemes, as can be seen from the figure：Sample after reinforcing forms highdensity dislocation and substantial amounts of nano twin crystal, twin
Size about 20nm.
The sample of comparative example 7 and embodiment 6 ~ 8 is subjected to hardness test.Hardness test condition is：Using Rockwell apparatus
The Rockwell hardness of sample before and after measurement processing；Test result is referring to Figure 11, as can be seen from the figure：Reinforcing of the present invention to sample
Obvious processing effect is better than the intensive treatment effect of brine hardening.
In summary, the method that uses of the present invention for：Sample is heated to more than phase transition temperature, is incubated, it is each to sample
Face is pressurizeed, constrained the volumetric expansion of sample in temperature-fall period, and specimen temperature is down to release after room temperature.By limiting phase transformation
Volumetric expansion in journey and fully by phase transformation internal stresses release inside ferrous materials, form a large amount of dislocations and nano twin crystal,
Dislocation density is about 1016~1017/m2, the size of nano twin crystal is less than 20nm.Than undressed ferrous materials hardness improve 4 ~
10 times, be hardening and the application developing new approaches of ferrous materials.
Claims (10)
1. a kind of super intensified method of constrained transition, this method include the combination of high pressure and high-temperature technology means, its feature
Include in the step of this method：
A, the sample after processing is heated to more than material phase transformation temperature,
B, and then to the comprehensive 1 ~ 5GPa of pressurization of sample,
C, 3 ~ 60min is incubated on the pressure spot of selection,
D, the pressure value of selection, release when reaching room temperature are maintained during cooling at random.
2. the super intensified method of constrained transition according to claim 1, it is characterised in that phase alternating temperature is heated in step a
More than degree 5 ~ 200 DEG C.
3. the super intensified method of constrained transition according to claim 1, it is characterised in that this method is used for metallic iron, tin
Or the intensive treatment of manganese, or the intensive treatment for Pattern Bainite Alloy steel, pearlitic steel or albronze.
4. a kind of super intensified method of constrained transition, this method include the combination of high pressure and high-temperature technology means, its feature
Include in the step of this method：
A, to the comprehensive 1 ~ 5GPa of pressurization of sample after processing,
B, maintain pressure value that sample is heated to more than phase transition temperature, be incubated 3 ~ 60min,
C, pressure value is maintained at random until being down to room temperature, release.
5. the super intensified method of constrained transition according to claim 3, it is characterised in that phase alternating temperature is heated in step b
More than degree 5 ~ 200 DEG C；This method be used for metallic iron, tin or manganese intensive treatment, or for Pattern Bainite Alloy steel, pearlitic steel or
The intensive treatment of albronze.
6. the technique strengthened based on the method described in claim 1 to pure iron or mild steel, including the melting of raw material, steel billet it is equal
Matter processing, sample processing and reinforcing, it is characterised in that process above comprises the following steps：
A, the melting of raw material：It is less than 0.2wt.% mild steel formula according to pure iron or carbon content, calculates ingredient proportion and melting
Into steel ingot；
B, the post processing of steel ingot：It is heat-treated 1 ~ 10 hour under the conditions of steel ingot in step A is maintained at into 1000 DEG C ~ 1200 DEG C, so
After be transferred to room temperature, in water quenching pool homogeneous complete solution treatment；
C, the processing of sample：By the steel ingot cogging after solution treatment in step B, sample is processed into according to design requirement；
D, the intensive treatment of sample：Sample is heated to 750 ~ 1100 DEG C, 3 ~ 60min is incubated on selected temperature spot；Simultaneously
The process conditions of guarantee are the modes by physical compression to 1 ~ 5GPa of all directions persistent pressure of sample；Sample drops naturally
Temperature, reach release after room temperature.
7. the technique according to claim 6 strengthened to pure iron or mild steel, it is characterised in that in step D, by sample certainly
When being so cooled to 300 ~ 600 DEG C, heat-insulation pressure keeping 5 ~ 300 minutes, then sample is down to room temperature, release.
8. the technique that the method according to claim 11 is strengthened to pure iron or mild steel, including the melting of raw material, steel billet it is equal
Matter processing, sample processing and reinforcing, it is characterised in that process above comprises the following steps：
A, the melting of raw material：It is less than 0.2wt.% mild steel formula according to pure iron or carbon content, calculates ingredient proportion and melting
Into steel ingot；
B, the post processing of steel ingot：It is heat-treated 1 ~ 10 hour under the conditions of steel ingot in step A is maintained at into 1000 DEG C ~ 1200 DEG C, so
After be transferred to room temperature, in water quenching pool homogeneous complete solution treatment；
C, the processing of sample：By the steel ingot cogging after solution treatment in step B, sample is processed into according to design requirement；
D, the intensive treatment of sample：1 ~ 5GPa height is loaded to each face consistent of sample by the mode of physical compression
Pressure, maintain pressure value that sample is heated into 750 ~ 1100 DEG C, be incubated 3 ~ 60min, then maintain pressure value that sample is natural at random
It is down to room temperature, release.
9. the technique according to claim 8 strengthened to pure iron or mild steel, it is characterised in that in step D, by sample certainly
When being so cooled to 300 ~ 600 DEG C, heat-insulation pressure keeping 5 ~ 300 minutes, then sample is down to room temperature, release.
10. a kind of high rigidity pure iron or mild steel, the technique strengthened using claim 6 ~ 9 any one to pure iron or mild steel
It is prepared, it is characterised in that pure iron or mild steel the middle position dislocation density is 1016~1017/m2。
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| PCT/CN2016/106101 WO2017201986A1 (en) | 2016-05-27 | 2016-11-16 | Nano-twinned crystal pure iron, and preparation method and process therefor |
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| CN113862429A (en) * | 2021-09-28 | 2021-12-31 | 燕山大学 | Efficient pre-hardening method for steel and steel workpiece |
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| CN104152797A (en) * | 2014-08-14 | 2014-11-19 | 燕山大学 | Low-temperature plastic high manganese steel plate and processing method thereof |
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| CN113862429B (en) * | 2021-09-28 | 2023-03-03 | 燕山大学 | Efficient pre-hardening method for steel and steel workpiece |
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