CN107574371B - A method of preparing high-yield strength twinning induced plasticity steel - Google Patents
A method of preparing high-yield strength twinning induced plasticity steel Download PDFInfo
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- CN107574371B CN107574371B CN201710604528.3A CN201710604528A CN107574371B CN 107574371 B CN107574371 B CN 107574371B CN 201710604528 A CN201710604528 A CN 201710604528A CN 107574371 B CN107574371 B CN 107574371B
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- induced plasticity
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Abstract
The invention discloses a kind of methods 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 in twinning induced plasticity steel of the present invention are as follows: Mn 14 ~ 25%, Si 0.5 ~ 4%, C 0.8 ~ 1.3%, N 0 ~ 0.3%, remaining is Fe and inevitable impurity, the specific method is as follows: by the twinning induced plasticity steel 950 DEG C ~ 1200 DEG C handle 20 minutes ~ 2 hours, then in deformation at room temperature 5% ~ 40%, finally 200 DEG C ~ 600 DEG C ageing treatment 20 minutes ~ 2 hours.There are a large amount of nanoscale twins in twinning induced plasticity steel after this method is handled, and the average headway of nano twin crystal is lower than 200nm.
Description
Technical field
The present invention relates to twinning induced plasticity rings domains, and in particular to a kind of to prepare high-yield strength twinning induced plasticity steel
Method.The yield strength of the twinning induced plasticity steel of this method preparation is significantly improved, and possesses the plasticity of higher level.
Background technique
Twinning induced plasticity steel tensile strength with higher and very high elongation percentage.In addition to this, 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 excellent performance as described above, its matrix is single austenite, therefore it is bent
It is relatively low (280 ~ 350MPa) to take intensity.For automobile steel, higher yield strength is to guarantee vehicle safety most
Important factor.Therefore it needs to strengthen twinning induced plasticity steel, improves its yield strength.
While traditional intensifying method such as refined crystalline strengthening and dispersion-strengtherning etc. can be such that material yield strength is promoted, often companion
With a large amount of losses of plasticity.Lu Ke et al. is proposed in article " nano twin crystal metal material " by introducing in crystalline material
The mode of high density coherence nano twin crystal comes 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, thus strengthening material；On the other hand, twin is as a kind of total
Lattice interface can accommodate more dislocations compared to the common crystal boundary of non-coherence, so that the plasticity and toughness of material will not be damaged seriously.
Twin lamellae thickness in micron or submicron order, can only generally 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 is still able to maintain good plasticity and toughness.
So introducing nano twin crystal is an ideal method for strengthening twinning induced plasticity steel.
Currently, plastic deformation is to introduce the most common 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 squeeze after, twinning induced plasticity steel yield strength from 366MPa promoted to
881MPa, but elongation percentage drops to 14.4% from 55.2%；Yield strength drops to 768MPa after 600 DEG C of recovery annealings, extends
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 is improved from 337MPa
To 1470MPa, while elongation percentage drops to 2% from 48%；Yield strength drops to 977MPa after 600 DEG C of recovery annealings, extends
Rate is also only returned to 21%(Acta Materialia, 2012,60:4027-4040).Wang et al. passes through surface mechanical grinding
Mill processing forms gradient nano twin on Fe-28Mn austenite twinning induced plasticity steel surface layer (~ 500 microns), stretched
The gradient nano twin yield strength that test measures surface layer formation may be up to 877MPa, but the integral yield of twinning induced plasticity steel
Intensity only rises to 455MPa(Scripta Materialia, 2013,68:22-27 from 255MPa).Bouaziz et al. is logical
The mode for crossing cold rolling introduces nano twin crystal in Fe-22Mn-0.6C twinning induced plasticity steel, however damage journey of the cold rolling to plasticity
Spend also larger, required heat treatment temperature is higher, very close to recrystallization temperature (Scripta Materialia, 2009,60:
714-716).And in this temperature stage, the performance of material is very big to the sensibility of temperature, this brings very for the production of industry
Hang-up.Although improving twin lure in conclusion above-mentioned several method can introduce nano twin crystal in twinning induced plasticity steel
The yield strength of plasticity steel is led, but still remains that plasticity loss is more, and the device is complicated is difficult to realize 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, occurs that twinning induced plasticity steel again
Crystallization, and in this temperature stage, the performance of twinning induced plasticity steel is very big to the sensibility of temperature, very for industrial production
It is unfavorable.Therefore, high-yield strength high-ductility twinning induced plasticity steel how is prepared to be a problem to be solved.
Summary of the invention
The purpose of the present invention is to prior art there are the problem of, provide and a kind of prepare the twin induction of high-yield strength
The method of plasticity steel.
Nano twin crystal circle can effectively hinder the movement of dislocation, while the twin boundary and nano twin crystal/base sheet of a large amount of coherences
Layer can be used as slide surface to provide very large space for the sliding and storage of dislocation.So when twin lamellae is nanoscale
The significant strengthening material of ability, and material is made still to be able to maintain higher plasticity.Twin lamellae thickness is smaller, i.e., twin is thinner, material
Intensity it is higher, plasticity is also better.It therefore, if can twin to be formed in refiner material, so that it may relatively small pre-
So that material is reached higher intensity under deflection while keeping good plasticity, and then reduces required heat treatment temperature.
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 alloy is in 20 ~ 70nm, and life in Fe-28Mn-3.5Si-2.8Al
At 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, and be unfavorable for the formation of twin.Another party
Face, Si element can also significantly reduce the stacking fault energy of material other than having the function of strengthening matrix (50MPa/1wt%Si), promote
Into the generation of twin；Meanwhile Si element can also reduce the diffusion coefficient of C atom, and then can inhibit carbide in annealing process
It is precipitated.Based on above-mentioned analysis, the present invention proposes: the carbon content of current Fe-Mn-C base twinning induced plasticity steel is increased to
0.8% or more, while Si element is added, guarantee that a large amount of nano twin crystal can be obtained when deformation.Then deformation is reduced by annealing to draw
Enter the quantity of dislocation, while utilizing the addition of Si to inhibit the precipitation of carbide in annealing process, and then add annealing by deformation
Method introduces nano twin crystal and guarantees good plasticity while improving twinning induced plasticity steel yield strength.Therefore, this hair
It is bright in order to guarantee that twinning induced plasticity steel can introduce a large amount of nano twin crystals in deformation, and when inhibiting heat treatment carbide analysis
Out, the weight percent content of the twinning induced plasticity steel each element are as follows: Mn 14 ~ 25%, Si 0.5 ~ 4%, C 0.8 ~ 1.3%,
N 0 ~ 0.3%, Yu Wei Fe and inevitable impurity.
The present invention prepares high-yield strength twinning induced plasticity steel, and specific step is as follows: by the twin induction of mentioned component
Plasticity steel is first handled 20 minutes ~ 2 hours at 950 DEG C ~ 1200 DEG C, and it is subsequent change that this, which is to obtain single austenite structure,
Shape introduces a large amount of nano twin crystals and prepares；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 the dislocation generated when this is to partially remove deformation improves plasticity, keeps away simultaneously
Exempt to occur to recrystallize the reduction for leading to yield strength, and the precipitation of carbide is avoided to reduce plasticity.It is handled by the above process
Afterwards, there are a large amount of nano twin crystals in the twinning induced plasticity steel, and the average headway of nano twin crystal is lower 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 are finally preferably handled at 300 DEG C ~ 550 DEG C then preferably in deformation at room temperature 10% ~ 30%.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 lower than 100nm.
Compared with prior art, the present invention has the advantage that (1) surrender that can significantly improve twinning induced plasticity steel is strong
Degree, while guaranteeing that it still possesses the plasticity of higher level.(2) conventional equipment is just able to satisfy the requirement of preparation method, it can be achieved that big
The production of amount and large-scale block.
Detailed description of the invention
Fig. 1 is the metallographic microscope of high-yield strength twinning induced plasticity steel embodiment 18 prepared by the present invention.Illustrate that this is twin
There are a large amount of feather organizations for 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 lower than 200nm.
Specific embodiment
Embodiment is given below, the invention will be further described in conjunction with the drawings and specific embodiments.It is worth pointing out
It is that the embodiment provided should not be understood as 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 the contents of the present invention make the present invention still should belong to the scope of the present invention.
The weight percent of the alloying component for the twinning induced plasticity steel that comparative example 1 and embodiment 1 to 24 are chosen are as follows: Mn
16.54%, Si 1.31%, C 1.04%, Yu Wei Fe and inevitable impurity.Comparative example 2 and embodiment 25 to 28 are chosen twin
The weight percent of the alloying component of raw inducing plasticity steel are as follows: Mn 16.72%, Si 2.12%, C 0.96%, N 0.18%, Yu Wei
Fe and inevitable impurity.In order to compare effect of the invention, comparative example 1 and 2 is air-cooled after only handling 30 minutes at 1100 DEG C.
Embodiment 1 to 28 is handled 20 minutes ~ 2 hours at 950 DEG C ~ 1200 DEG C, 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 data are clear
Show: twinning induced plasticity steel yield strength prepared by the present invention is significantly improved, and remains the plasticity of higher level.For
There are a large amount of nano twin crystal tissue in high-yield strength twinning induced plasticity steel prepared by the verifying present invention.Using metallographic
The microstructure that embodiment 18 is characterized with transmission electron microscope, is shown in Fig. 1 and Fig. 2, the results showed that strong through high yield prepared by the present invention
Really there is a large amount of nano twin crystal in degree twinning induced plasticity steel, and the average headway of nano twin crystal is lower than 200nm.These
The presence of nano twin crystal is the key that twinning induced plasticity steel while having high-yield strength and high-elongation.
The preparation method and mechanical property of 1 comparative example 1 to 2 of table and embodiment 1 to 28
Claims (6)
1. a kind of method for preparing high-yield strength twinning induced plasticity steel, which is characterized in that the twinning induced plasticity steel
The weight percent content of middle each element are as follows: Mn 14 ~ 25%, Si 0.5 ~ 4%, C 0.8 ~ 1.3%, N 0 ~ 0.3%, Yu Wei 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 ~ 500 DEG C；After the above process is handled, the twin induction modeling
Property steel in there are nano twin crystal, and the average headway of nano twin crystal is lower than 200nm.
2. a kind of method for preparing high-yield strength twinning induced plasticity steel according to claim 1, which is characterized in that institute
Twinning induced plasticity steel is stated first to handle at 1000 DEG C ~ 1100 DEG C.
3. a kind of method for preparing high-yield strength twinning induced plasticity steel according to claim 1, which is characterized in that institute
Twinning induced plasticity steel is stated in deformation at room temperature 10% ~ 30%.
4. a kind of method for preparing high-yield strength twinning induced plasticity steel according to claim 1, which is characterized in that institute
Twinning induced plasticity steel is stated to handle after deformation at room temperature in 300 DEG C ~ 500 DEG C.
5. a kind of method for preparing high-yield strength twinning induced plasticity steel according to claim 1, which is characterized in that warp
The elongation percentage of twinning induced plasticity steel after this method is handled is crossed not less than 35%.
6. a kind of method for preparing high-yield strength twinning induced plasticity steel according to claim 1, which is characterized in that warp
The average headway of nano twin crystal in twinning induced plasticity steel after this method is handled is crossed lower than 100nm.
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