CN106893813B - It is degenerated based on deformation twin and realizes the superplastic method of TWIP steel - Google Patents
It is degenerated based on deformation twin and realizes the superplastic method of TWIP steel Download PDFInfo
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- CN106893813B CN106893813B CN201710112465.XA CN201710112465A CN106893813B CN 106893813 B CN106893813 B CN 106893813B CN 201710112465 A CN201710112465 A CN 201710112465A CN 106893813 B CN106893813 B CN 106893813B
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/02—Superplasticity
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Abstract
It is degenerated based on deformation twin the invention discloses one kind and realizing the superplastic method of TWIP steel, included the following steps：1. choosing the TWIP steel bars of perfect recrystallization state, stretch at room temperature, tensile deformation rate is 1~10mm/s, and tensile deformation amount is 40%；2. deformation twin degeneration is handled：Heat preservation is carried out to the TWIP steel bars after stretching so that its organization internal deforms upon twin and degenerates and disappear, temperature is 650~850 DEG C, keeps the temperature 30~60min, is quenched after heat treatment；3. being stretched at room temperature to quenched TWIP steel bars, tensile deformation rate is 10‑1~1mm/s, tensile deformation amount are 30%；4. repeat step 2.~3. so that after deformation breaking elongation be more than 100%, that is, realize superplasticity.The problems such as present invention, which solves TWIP steel deformation quantity is excessive in the hot rolling, causes deformation resistance big, is also easy to produce crackle, and superplasticforming rate is slow.
Description
Technical field
The invention belongs to metal material moulding and the technical fields of superplastic deformation, especially a kind of to be moved back based on deformation twin
Change and realizes the superplastic method of TWIP steel.
Background technology
TWIP (Twinning induced plasticity) steel, also known as twinning-induced plasticity steel, typically contain 15% with
Upper manganese element, therefore also belong to potassium steel.TWIP has very high strain hardening rate, is generated during plastic deformation
High density deformation twin, deformation twin circle of these micro/nano-scales and the reciprocation of dislocation and crystal boundary cause significantly to process hard
Change.However exactly above-mentioned reciprocation causes TWIP steel resistance of deformation in rolling rapidly to increase, easily problems of crack, pole
The big Plastic Forming difficulty for increasing TWIP.
The superplasticity of metal material refers to metal in specified conditions (crystal grain refinement, extremely low deformation velocity and wait warm deformations)
Under, the plasticity (elongation percentage ＞ 100%) with bigger.
Number of patent application is the file of CN201310234229.7《A kind of difficult deformation nickel base superalloy superplasticforming side
Method》, propose the difficult method for deforming nickel base superalloy superplasticforming：Pre-prepd wrought alloy blank initial grain
Degree is less than 10 μm, and at nearly equiax crystal state；It is forged under isothermy (temperature is 1040~1120 DEG C)；Strain rate is
1x10-4~5x10-4s-1.Shortcomings：Material grains size need to be pre-processed, increase cost；Isothermal forging high temperature into
Row is not easy to control；Strain rate is low, low production efficiency.
Number of patent application is the file of 201510042246.X, realizes that 304 stainless steels are super using martensitic traoformation cycle
Plastic deformation.But its rate of extension is 0 ＜ v≤5mm/min, stretcher strain amount is 30%, 700 DEG C≤T of aging temperature≤
900 DEG C of technique equally exists following deficiency：Rate of deformation is low, low production efficiency；Single deformation quantity is small, and cycle-index is more；When
It is high to imitate treatment temperature, increases cost.
Number of patent application：201610076127.0 file, the TiAl-base alloy for taking powder metallurgic method to prepare, hot rolling is
After plank, TiAl-base alloy is adjusted by heat treatment method and is organized as γ phases and α2After the tiny bifurcation tissue of phase with superplasticity at
900~980 DEG C are integrally heated to after the assembling of shape mold, is 900~980 DEG C, judgement of speed change into trip temperature after keeping the temperature 20~30 minutes
Rate is 8 × 10-5s-1~5 × 10-4s-1Superplasticforming equally exists the problem that forming temperature is high, rate of deformation is slow.
Therefore existing superplasticforming field substantially uses fine crystalline superplastic material at present, has following
It is insufficient：The thinning preprocess of crystal grain, crystallite dimension generally require to be less than 5 μm；Certain deformation temperature, generally 0.5Tm~Tm,
Wherein Tm is alloy melting point, related with material composition；Low strain rate generally requires strain rate control 10-4~10- 1Within the scope of mm/s.Therefore, fine crystalline superplastic is mainly characterized by equipment requirement high (high temperature deformation), poor efficiency and high
Pretreatment expense, this is also to cause fine crystalline superplastic the reason of superplasticforming field is difficult to extensive use.
Invention content
For overcome the deficiencies in the prior art, low, at low cost and production effect that the present invention provides a kind of processing difficulty
High degenerated based on deformation twin of rate realizes the superplastic method of TWIP steel, and this method solve TWIP steel shapes in the hot rolling
The problems such as variable is excessive to cause deformation resistance big, is also easy to produce crackle, while Superplastic Deformation shaping rate is slow.
To achieve the goals above, the technical solution adopted by the present invention is：One kind is degenerated based on deformation twin realizes TWIP
The superplastic method of steel, which is characterized in that include the following steps：1. being stretched at room temperature to TWIP steel bars, shape is stretched
Variable Rate is 1~10mm/s, and tensile deformation amount is 40%；The TWIP steel bars are perfect recrystallization state；
2. carrying out deformation twin degeneration processing to TWIP steel bars：At temperature T, the TWIP steel bars after stretching are carried out
Heat preservation is so that its organization internal deforms upon twin and degenerates and disappear, and the temperature T is 650 DEG C~850 DEG C, and soaking time is
30min~60min quenches TWIP steel bars after heat preservation heat treatment；
3. being stretched at room temperature to quenched TWIP steel bars, tensile deformation rate is 10-1~1mm/s is stretched
Deformation quantity is 30%；
4. repeat step 2.~3., after deformation measure total uniform elongation be more than 100%, that is, realize superplasticity；
5. the bar handled is carried out pickling, surface scale is removed.
Further, the step 1. in TWIP steel bars stretched at room temperature, tensile deformation rate be 1~
10mm/s。
Further, the step 2. in temperature T be 650 DEG C, soaking time 60min.
Further, the step 2. in temperature T be 850 DEG C, soaking time 30min.
Further, the step 2. in temperature T be 650 DEG C, soaking time 30min.
Using the above scheme, the present invention has the following effects that：
1) deformation process can carry out at room temperature, i.e., without any requirement to forming temperature, and fixture or mold have without preheating
Conducive to practical application；
2) technique of multi-pass deformation is set：The TWIP steel for being wherein directed to perfect recrystallization state uses tensile deformation rate
For 1~10mm/s, the technique that deformation quantity is 40% is conducive to improve production efficiency；Degenerating for deformation twin, treated
TWIP steel there may be incomplete problem of degenerating, and use tensile deformation rate for 10-1~1mm/s, deformation quantity are 30%
Technique advantageously ensures that the formability of material；The process advan of multi-pass deformation realizes that superplasticity becomes in ensureing big deformation quantity
Shape；The large-scale shaping rate of the present invention reduces the control accuracy requirement of machine-shaping device, while forming speed is fast, production
It is efficient；
3) deformation twin annealing required temperature is 650 DEG C~850 DEG C, and temperature is relatively low, energy consumption cost is reduced, after being heat-treated
Can direct quenching, without annealing can be conducive to improve production efficiency；
4) mechanism degenerated based on deformation twin is eliminated most of deformation twin in the operation of rolling, advantageously reduces change
Shape resistance protects machine-shaping device.
The invention will be further described below in conjunction with the accompanying drawings.
Description of the drawings
Attached drawing 1 is the original sample metallographic structure figure (enlargement ratio 200) of the specific embodiment of the invention；
Metallographic structure figure (deformation quantity 40%, enlargement ratio after attached drawing 2 stretches for original sample in the specific embodiment of the invention 1
200)；
Attached drawing 3 is that the TWIP steel that deformation quantity is 40% in the specific embodiment of the invention 1 is golden after 650 DEG C of 60min are quenched
Phase constitution figure (enlargement ratio 200)；
Attached drawing 4 is TWIP steel metallographic structure after 850 DEG C of 30min are quenched in the specific embodiment of the invention 2 after deformation
Scheme (enlargement ratio 200)；
Attached drawing 5 is TWIP steel metallographic structure after 650 DEG C of 30min are quenched in the specific embodiment of the invention 3 after deformation
Scheme (enlargement ratio 200).
Specific implementation mode
Specific embodiments of the present invention are to degenerate to realize the superplastic side of TWIP steel based on deformation twin as shown in Figs 1-4
Method, which is characterized in that include the following steps：1. TWIP steel bars are stretched at room temperature, tensile deformation rate be 1~
10mm/s, tensile deformation amount are 40%；The TWIP steel bars are perfect recrystallization state；
2. carrying out deformation twin degeneration processing to TWIP steel bars：At temperature T, the TWIP steel bars after stretching are carried out
Heat preservation is so that its organization internal deforms upon twin and degenerates and disappear, and the temperature T is 650 DEG C~850 DEG C, and soaking time is
30min~60min quenches TWIP steel bars after heat preservation heat treatment；
3. being stretched at room temperature to quenched TWIP steel bars, tensile deformation rate is 10-1~1mm/s is stretched
Deformation quantity is 30%；
4. repeat step 2.~3., after deformation measure total uniform elongation be more than 100%, that is, realize superplasticity；
5. the bar handled is carried out pickling, surface scale is removed.
Embodiment 1：
1) TWIP steel bars, microscopic structure is used to see Fig. 1, it is stretched at room temperature that tensile deformation rate is
1mm/s, deformation quantity 40%, microscopic structure is shown in Fig. 2 after stretching；
2) deformation twin degeneration is handled, and holding temperature is:650 DEG C, soaking time 60min is quenched after heat treatment,
Microscopic structure is shown in Fig. 3 after quenching；
3) TWIP steel bars are stretched at room temperature, tensile deformation rate is 1mm/s, deformation quantity 30%；
4) deformation twin degeneration is handled, and holding temperature is 650 DEG C, and soaking time 60min is quenched after heat treatment；
5) TWIP steel bars are stretched at room temperature, tensile deformation rate is 10-1Mm/s, deformation quantity 30%；
6) deformation twin degeneration is handled, and holding temperature is 650 DEG C, and soaking time 60min is quenched after heat treatment；
Through measuring, breaking elongation about 132% realizes superplastic deformation.As can be seen from Figure 1, original sample is before non-stretched, group
Interior undeformed twin is knitted, and after 40% deformation, inside, which is germinated, a large amount of deformation twin (see Fig. 2), a large amount of deformation
Twin makes material generation strain hardening with itself or dislocation interaction.It is quenched after 650 DEG C of 60min are kept the temperature, it is internal exhausted
Most of deformation twin is degenerated, and sees Fig. 3.
Embodiment 2
1) TWIP steel bars are stretched at room temperature, tensile deformation rate is 5mm/s, deformation quantity 40%；
2) deformation twin degeneration is handled, and holding temperature is 850 DEG C, and soaking time 30min is quenched after heat treatment；
3) TWIP steel bars are stretched at room temperature, tensile deformation rate is 1mm/s, deformation quantity 30%；
4) deformation twin degeneration is handled, and holding temperature is 850 DEG C, and soaking time 30min is quenched after heat treatment,
Microscopic structure is shown in Fig. 4 after quenching；
5) TWIP steel bars are stretched at room temperature, tensile deformation rate is 10-1Mm/s, deformation quantity 30%；
6) deformation twin degeneration is handled, and holding temperature is 850 DEG C, and soaking time 30min is quenched after heat treatment；
Through measuring, breaking elongation about 129% realizes superplastic deformation.As can be seen from Figure 1, original sample is before non-stretched, group
Interior undeformed twin is knitted, and tensile sample quenches after 850 DEG C of 30min are kept the temperature, internal distortions twin has occurred to move back completely
Change (see Fig. 4).
Embodiment 3
1) TWIP steel bars are stretched at room temperature, tensile deformation rate is 10mm/s, deformation quantity 40%；
2) deformation twin degeneration is handled, and holding temperature is 650 DEG C, and soaking time 30min is quenched after heat treatment；
3) TWIP steel bars are stretched at room temperature, tensile deformation rate is 10-1Mm/s, deformation quantity 30%；
4) deformation twin degeneration is handled, and holding temperature is 650 DEG C, and soaking time 30min is quenched after heat treatment；
5) TWIP steel bars are stretched at room temperature, tensile deformation rate is 10-1Mm/s, deformation quantity 30%；
6) deformation twin degeneration is handled, and holding temperature is 650 DEG C, and soaking time 30min is quenched after heat treatment,
Microscopic structure is shown in Fig. 5 after quenching.
From fig. 5, it can be seen that TWIP steel after deformation is after 650 DEG C of 30min are quenched, compared to the sample after stretching,
Considerable degree of degeneration occurs for its internal annealing twin.Through measuring, breaking elongation about 133% realizes superplastic deformation.
Following supplement is using tensile deformation rate as the experimental data of variable：
Table 1- is using tensile deformation rate as the experimental data of variable
Following supplement is using holding temperature T as the experimental data of variable：
Table 2- is using holding temperature T as the experimental data of variable
TWIP steel is can be seen that after the processing such as quenching, stretching from embodiment 1-3, and phase occurs for internal annealing twin
When the degeneration of degree；And through measuring, breaking elongation reaches 123%~134%, realizes superplastic deformation.
The present invention is not limited to above-mentioned specific implementation mode, and persons skilled in the art are according to disclosed by the invention interior
Hold, other a variety of specific implementation modes may be used and implement of the invention or every design structure using the present invention and think of
Road does simple change or change, both falls within protection scope of the present invention.
Claims (4)
1. one kind is degenerated based on deformation twin realizes the superplastic method of TWIP steel, which is characterized in that include the following steps：1. right
TWIP steel bars are stretched at room temperature, and tensile deformation rate is 1~10mm/s, and tensile deformation amount is 40%；The TWIP
Steel bar is perfect recrystallization state；
2. carrying out deformation twin degeneration processing to TWIP steel bars：At temperature T, the TWIP steel bars after stretching are kept the temperature
So that its organization internal deforms upon twin and degenerates and disappear, the temperature T is 650 DEG C~850 DEG C, soaking time 30min
~60min quenches TWIP steel bars after heat preservation heat treatment；
3. being stretched at room temperature to quenched TWIP steel bars, tensile deformation rate is 10-1~1mm/s, tensile deformation
Amount is 30%；
4. repeat step 2.~3., after deformation measure total uniform elongation be more than 100%, that is, realize superplasticity；
5. the bar handled is carried out pickling, surface scale is removed.
2. according to claim 1 degenerated based on deformation twin realizes the superplastic method of TWIP steel, it is characterised in that：Institute
Temperature T in stating step 2. is 650 DEG C, soaking time 60min.
3. according to claim 1 degenerated based on deformation twin realizes the superplastic method of TWIP steel, it is characterised in that：Institute
Temperature 1 in stating step 2. is 850 DEG C, soaking time 30min.
4. according to claim 1 degenerated based on deformation twin realizes the superplastic method of TWIP steel, it is characterised in that：Institute
Temperature T in stating step 2. is 650 DEG C, soaking time 30min.
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| CN110951956B (en) * | 2019-12-19 | 2021-07-27 | 中北大学 | Production method of ultra-high plasticity TWIP steel |
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Application publication date: 20170627 Assignee: WENZHOU PHEOBON HARDWARE Co.,Ltd. Assignor: ZHEJIANG INDUSTRY & TRADE VACATIONAL College Contract record no.: X2023330000087 Denomination of invention: Method of realizing superplasticity of TWIP steel based on deformation twin degradation Granted publication date: 20180904 License type: Common License Record date: 20230310 |