CN107574371A - A kind of method for preparing high-yield strength twinning induced plasticity steel - Google Patents
A kind of method for preparing high-yield strength twinning induced plasticity steel Download PDFInfo
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- CN107574371A CN107574371A CN201710604528.3A CN201710604528A CN107574371A CN 107574371 A CN107574371 A CN 107574371A CN 201710604528 A CN201710604528 A CN 201710604528A CN 107574371 A CN107574371 A CN 107574371A
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Abstract
The invention discloses a kind of method for preparing high-yield strength twinning induced plasticity steel.The present invention can significantly improve the yield strength of the twinning induced plasticity steel, and its plasticity is still maintained at higher level.The weight percent content of each element is in twinning induced plasticity steel of the present invention：Mn 14 ~ 25%, Si 0.5 ~ 4%, C 0.8 ~ 1.3%, N 0 ~ 0.3%, remaining is that Fe and inevitable impurity, specific method are as follows：The twinning induced plasticity steel is handled 20 minutes ~ 2 hours at 950 DEG C ~ 1200 DEG C, then in deformation at room temperature 5% ~ 40%, finally in 200 DEG C ~ 600 DEG C Ageing Treatments 20 minutes ~ 2 hours.A large amount of nanoscale twins in twinning induced plasticity steel after this method is handled be present, and the average headway of nano twin crystal is less than 200nm.
Description
Technical field
The present invention relates to twinning induced plasticity rings domain, and in particular to one kind prepares high-yield strength twinning induced plasticity steel
Method.The yield strength of twinning induced plasticity steel prepared by this method is significantly improved, and possesses the plasticity of higher level.
Background technology
Twinning induced plasticity steel has higher tensile strength and very high elongation percentage.In addition, such steel also has
High energy absorption capability and there is no black brittleness transition temperature.These superior performances are just meeting auto industry and are improving peace
Full standard and more rationally, the requirement that produces etc. of low cost, also become an important development of young mobile steel
Direction.Although twinning induced plasticity steel has premium properties as described above, its matrix is single austenite, therefore it is bent
It is relatively low to take intensity（280~350MPa）.For automobile steel, higher yield strength is to ensure vehicle safety most
Important factor.Therefore need to strengthen twinning induced plasticity steel, improve its yield strength.
While traditional intensifying method such as refined crystalline strengthening and dispersion-strengtherning etc. can be lifted material yield strength, often companion
With a large amount of losses of plasticity.Lu Ke et al. is proposed by being introduced in crystalline material in article " nano twin crystal metal material "
The mode of high density coherence nano twin crystal carrys out strengthening material（Acta Metallurgica Sinica, 2010,11: 1422-1427）.On the one hand, twin
It is the same with common high-angle boundary, the sliding of dislocation can be hindered, so as to strengthening material；On the other hand, twin is as a kind of common
Lattice interface, compared to the common crystal boundary of non-coherence, more dislocations can be accommodated, so as to will not seriously damage the plasticity and toughness of material.
Twin lamellae thickness in micron or submicron order, can only typically play a role for strengthening material.And only work as twin
Lamellar spacing is refined to nanometer scale, and strengthening effect can just be significantly improved, while material remains to keep good plasticity and toughness.
So it is an ideal method for strengthening twinning induced plasticity steel to introduce nano twin crystal.
At present, plastic deformation is to introduce the most frequently used method of nano twin crystal, including cold rolling, surface mechanical attrition treatment, etc.
Channel angular extrusion and dynamic plasticity deformation etc..Haase et al. is applied to Fe-23Mn- by Equal-channel Angular Pressing
1.5Al-0.3C twinning induced plasticity steel；Through 1 passage extrude after, twinning induced plasticity steel yield strength from 366MPa lifted to
881MPa, but elongation percentage drops to 14.4% from 55.2%；Yield strength drops to 768MPa after 600 DEG C of recovery annealings, extension
Rate is also only returned to 24.2%（Acta Materialia, 2016, 107: 239-253）.Wang et al. is become by dynamic plasticity
After shape introduces nano twin crystal in Fe-25Mn-3Si-3Al twinning induced plasticity steel, the yield strength of material improves from 337MPa
To 1470MPa, while elongation percentage drops to 2% from 48%；Yield strength drops to 977MPa after 600 DEG C of recovery annealings, extension
Rate is also only returned to 21%（Acta Materialia, 2012, 60: 4027-4040）.Wang et al. passes through surface mechanical grinding
Mill processing is on Fe-28Mn austenite twinning induced plasticity steel top layer（~ 500 microns）Gradient nano twin is formd, it is stretched
The gradient nano twin yield strength that experiment measures top layer formation may be up to 877MPa, but the integral yield of twinning induced plasticity steel
Intensity only rises to 455MPa from 255MPa（Scripta Materialia, 2013, 68: 22-27）.Bouaziz et al. is logical
The mode for crossing cold rolling introduces nano twin crystal in Fe-22Mn-0.6C twinning induced plasticity steel, but infringement journey of the cold rolling to plasticity
Degree is also larger, and required heat treatment temperature is higher, is sufficiently close to recrystallization temperature（Scripta Materialia, 2009, 60:
714-716）.And it is very big to the sensitiveness of temperature in this temperature stage, the performance of material, this brings very for the production of industry
Hang-up.In summary, although above-mentioned several method can introduce nano twin crystal in twinning induced plasticity steel, twin lure is improved
Lead the yield strength of plasticity steel, but still exist plasticity loss it is more, equipment complexity is difficult to the life of a large amount of and large-scale block
The problems such as production.Also, the above method also needs to be heat-treated more than recrystallization temperature, twinning induced plasticity steel is set to occur again
Crystallization, and it is very big to the sensitiveness of temperature in this temperature stage, the performance of twinning induced plasticity steel, for industrial production very
It is unfavorable.Therefore, how to prepare high-yield strength high-ductility twinning induced plasticity steel is urgent problem to be solved.
The content of the invention
The problem of purpose of the present invention exists aiming at prior art, there is provided one kind prepares the twin induction of high-yield strength
The method of plasticity steel.
Nano twin crystal circle can effectively hinder the motion of dislocation, while the twin boundary and nano twin crystal/base sheet of a large amount of coherences
Layer can provide very big space as slide surface so as to the sliding for dislocation and storage.So when twin lamellae is nanoscale
The notable strengthening material of ability, and material is remained to keep higher plasticity.Twin lamellae thickness is smaller, i.e., twin is thinner, material
Intensity it is higher, plasticity is also better.Therefore, if twin that can be to be formed in refiner material, it is possible to relatively small pre-
Material is reached higher intensity under deflection while keep good plasticity, and then the heat treatment temperature needed for reducing.
Whether twinning induced plasticity steel can introduce a large amount of nano twin crystals in deformation and depend primarily on alloying component.Identical
Under deflection, the twin size generated in Fe-20Mn-1.2C alloys is in 20 ~ 70nm, and life in Fe-28Mn-3.5Si-2.8Al
Into twin size in 100 ~ 700nm（Scripta Materialia, 2010, 63: 961-964）.Fe- common at present
The size of the deformation twins of 17Mn-0.6C twinning induced plasticity steel is in 100 ~ 300nm.It follows that dramatically increasing for C content can
Twin is set to refine to nanoscale.But C content increase can improve the stacking fault energy of material, it is unfavorable for the formation of twin again.The opposing party
Face, Si elements are except having the function that to strengthen matrix（50MPa/1wt%Si）Outside, the stacking fault energy of material can also be significantly reduced, is promoted
Enter the generation of twin；Meanwhile Si elements can also reduce the diffusion coefficient of C atoms, and then carbide in annealing process can be suppressed
Separate out.Based on above-mentioned analysis, the present invention proposes：The carbon content of current Fe-Mn-C base twinning induced plasticity steel is brought up to
More than 0.8%, while Si elements are added, ensure that during deformation substantial amounts of nano twin crystal can be obtained.Then drawn by reduction deformation of annealing
Enter the quantity of dislocation, while suppress the precipitation of carbide in annealing process using Si addition, and then annealing is added by deformation
Method introduces nano twin crystal, while twinning induced plasticity steel yield strength is improved, ensures good plasticity.Therefore, this hair
It is bright in order to ensure that twinning induced plasticity steel can introduce a large amount of nano twin crystals in deformation, and suppress the analysis of carbide during heat treatment
Go out, the weight percent content of the twinning induced plasticity steel each element is：Mn 14 ~ 25%, Si 0.5 ~ 4%, C 0.8 ~ 1.3%,
N 0 ~ 0.3%, remaining is Fe and inevitable impurity.
The present invention prepares comprising the following steps that for high-yield strength twinning induced plasticity steel：By the twin induction of mentioned component
Plasticity steel is first handled 20 minutes ~ 2 hours at 950 DEG C ~ 1200 DEG C, and this is to obtain single austenite structure, is become to be follow-up
Shape introduces a large amount of nano twin crystals and prepared；Then in deformation at room temperature 5% ~ 40%, this is to introduce a large amount of nano twin crystals；Finally exist
200 DEG C ~ 600 DEG C are handled 20 minutes ~ 2 hours, and this is to partially remove dislocation caused by deformation, improves plasticity, keeps away simultaneously
Exempt to occur to recrystallize the reduction for causing yield strength, and avoid the precipitation of carbide from reducing plasticity.Handled by said process
Afterwards, a large amount of nano twin crystals in the twinning induced plasticity steel be present, and the average headway of nano twin crystal is less than 200nm.
In order to obtain optimal yield strength and elongation percentage combination, by the twinning induced plasticity steel preferably first at 1000 DEG C
~ 1100 DEG C of processing, then preferably finally preferably handled in deformation at room temperature 10% ~ 30% at 300 DEG C ~ 550 DEG C.At the present invention
After reason, the elongation percentage of twinning induced plasticity steel is not less than 35%, and the average headway of nano twin crystal is less than 100nm.
Compared with prior art, the invention has the advantages that：（1）The surrender that twinning induced plasticity steel can be significantly improved is strong
Degree, while ensure that it still possesses the plasticity of higher level.（2）Conventional equipment just can meet the requirement of preparation method, can be achieved big
The production of amount and large-scale block.
Brief description of the drawings
Fig. 1 is the metallograph of the high-yield strength twinning induced plasticity steel embodiment 18 prepared by the present invention.Illustrate that this is twin
A large amount of feather organizations be present in raw inducing plasticity steel.
Fig. 2 be the present invention prepared by high-yield strength twinning induced plasticity steel embodiment 18 transmission electron microscope photo and its
Diffraction pattern.Diffraction pattern illustrates that lamellar structure present in the twinning induced plasticity steel is twin, transmission electron microscope photo explanation
Twin present in the twinning induced plasticity steel is nanoscale, and the average headway of nano twin crystal is less than 200nm.
Embodiment
Embodiment is given below, the invention will be further described with reference to the drawings and specific embodiments.It is worth what is pointed out
It is the embodiment provided it is not intended that limiting the scope of the invention, the person skilled in the art in the field is according to above-mentioned
Some nonessential modifications and adaptations that present disclosure is made to the present invention should belong to the scope of the present invention.
The percentage by weight of the alloying component for the twinning induced plasticity steel that comparative example 1 and embodiment 1 to 24 are chosen is：Mn
16.54%, Si 1.31%, C 1.04%, remaining is Fe and inevitable impurity.Comparative example 2 and embodiment 25 to 28 are chosen twin
The percentage by weight of the alloying component of raw inducing plasticity steel is：Mn 16.72%, Si 2.12%, C 0.96%, N 0.18%, Yu Wei
Fe and inevitable impurity.In order to contrast the effect of the present invention, air cooling after comparative example 1 and 2 is only handled 30 minutes at 1100 DEG C.
Embodiment 1 to 28 is to be handled at 950 DEG C ~ 1200 DEG C 20 minutes ~ 2 hours, then in deformation at room temperature 10% ~ 40%, finally 300
DEG C ~ 600 DEG C handle 20 minutes ~ 2 hours.The mechanical property of comparative example 1 to 2 and embodiment 1 to 28 is shown in Table 1, and its data is clear
Show：Twinning induced plasticity steel yield strength prepared by the present invention is significantly improved, and remains the plasticity of higher level.For
Substantial amounts of nano twin crystal tissue be present in high-yield strength twinning induced plasticity steel prepared by the checking present invention.Using metallographic
The microstructure of embodiment 18 is characterized with transmission electron microscope, sees Fig. 1 and Fig. 2, the results showed that：The high yield prepared through the present invention is strong
Substantial amounts of nano twin crystal really be present in degree twinning induced plasticity steel, and the average headway of nano twin crystal is less than 200nm.These
The presence of nano twin crystal is twinning induced plasticity steel while has high-yield strength and the key of high-elongation.
The preparation method and mechanical property of the comparative example 1 to 2 of table 1 and embodiment 1 to 28
Claims (6)
- A kind of 1. method for preparing high-yield strength twinning induced plasticity steel, it is characterised in that described twinning induced plasticity steel The weight percent content of middle each element is：Mn 14 ~ 25%, Si 0.5 ~ 4%, C 0.8 ~ 1.3%, N 0 ~ 0.3%, it is remaining for Fe and not Evitable impurity；Above-mentioned twinning induced plasticity steel is first handled 20 minutes ~ 2 hours at 950 DEG C ~ 1200 DEG C；Then in room temperature Deformation 5% ~ 40%；Finally handled 20 minutes ~ 2 hours at 200 DEG C ~ 600 DEG C；After said process is handled, the twin induction modeling Nano twin crystal be present in property steel, and the average headway of nano twin crystal is less than 200nm.
- A kind of 2. method for preparing high-yield strength twinning induced plasticity steel according to claim 1, it is characterised in that institute Twinning induced plasticity steel is stated first in 1000 DEG C ~ 1100 DEG C processing.
- A kind of 3. method for preparing high-yield strength twinning induced plasticity steel according to claim 1, it is characterised in that institute Twinning induced plasticity steel is stated in deformation at room temperature 10% ~ 30%.
- A kind of 4. method for preparing high-yield strength twinning induced plasticity steel according to claim 1, it is characterised in that institute Twinning induced plasticity steel is stated in deformation at room temperature after 300 DEG C ~ 550 DEG C processing.
- A kind of 5. method for preparing high-yield strength twinning induced plasticity steel according to claim 1, it is characterised in that warp The elongation percentage for crossing twinning induced plasticity steel after this method is handled is not less than 35%.
- A kind of 6. method for preparing high-yield strength twinning induced plasticity steel according to claim 1, it is characterised in that warp The average headway for crossing nano twin crystal in twinning induced plasticity steel after this method is handled is less than 100nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287542A (en) * | 2022-08-19 | 2022-11-04 | 四川大学 | High-strength low-magnetic steel with uniform nano twin crystal distribution and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429621A (en) * | 2008-12-19 | 2009-05-13 | 北京科技大学 | Nitrogen intensified high-carbon twin crystal inducement plastic steel material and its production technique |
| CN102392179A (en) * | 2011-12-12 | 2012-03-28 | 东北大学 | Steel plate with ultrahigh strength and ultrahigh toughness, and preparation method thereof |
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- 2017-07-24 CN CN201710604528.3A patent/CN107574371B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429621A (en) * | 2008-12-19 | 2009-05-13 | 北京科技大学 | Nitrogen intensified high-carbon twin crystal inducement plastic steel material and its production technique |
| CN102392179A (en) * | 2011-12-12 | 2012-03-28 | 东北大学 | Steel plate with ultrahigh strength and ultrahigh toughness, and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287542A (en) * | 2022-08-19 | 2022-11-04 | 四川大学 | High-strength low-magnetic steel with uniform nano twin crystal distribution and preparation method thereof |
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