CN109735698B - Manganese TRIP steel and its method of low temperature process forming in a kind of high-performance - Google Patents
Manganese TRIP steel and its method of low temperature process forming in a kind of high-performance Download PDFInfo
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- CN109735698B CN109735698B CN201910099163.2A CN201910099163A CN109735698B CN 109735698 B CN109735698 B CN 109735698B CN 201910099163 A CN201910099163 A CN 201910099163A CN 109735698 B CN109735698 B CN 109735698B
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- 239000011572 manganese Substances 0.000 title claims abstract description 84
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 75
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910000794 TRIP steel Inorganic materials 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000008569 process Effects 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000005096 rolling process Methods 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 23
- 229910001566 austenite Inorganic materials 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 9
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 238000005192 partition Methods 0.000 abstract description 8
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 abstract description 2
- 238000004080 punching Methods 0.000 description 15
- 229910000712 Boron steel Inorganic materials 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 230000008520 organization Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Manganese TRIP steel and its method of low temperature process forming, belong to technical field of ultrahigh-strength steel in a kind of high-performance.This method are as follows: the medium managese steel ingot casting after cutting is heated to 600~800 DEG C of 0.5~1.5h of heat preservation, two-phase section rolling is carried out, it is air-cooled, it is again heated to 600~800 DEG C of 5~10min of heat preservation, manganese TRIP steel plate is transferred in stamping die in obtaining austenitizing treated, ensure to cool down that, at 50~100 DEG C, progress is stamping, after 10~30s of pressure maintaining, 180~250 DEG C are cooled to mould, 250~450 DEG C of heat preservation 10~30min are heated to, it is air-cooled, obtain manganese TRIP steel drip molding in high-performance.This method is rolled by two-phase section, is allowed C/Mn to shift to an earlier date partition, is then handled by subsequent Q&P, allows C/Mn partition again.The manufacturing process improves rolling efficiency and stamping parts surface quality, so that the stamping parts intensity height and high comprehensive performance of preparation, meet the target call of automobile industry.
Description
Technical field
The invention belongs to technical field of ultrahigh-strength steel, and in particular to manganese TRIP steel and its low temperature process in a kind of high-performance
The method of forming.
Background technique
Since the 21th century, as the aggravation of energy crisis and environmental problem, energy conservation and safety have become automobile system
Make the trend of industry development.In order to realize energy-saving and emission-reduction, while the requirement of safety is had both, has greatly facilitated the advanced height of automobile
The application of strong steel pressing.Currently, the stamping parts material of more mature automobile is boron steel, such as 22MnB5.In drop stamping
22MnB5 is heated to 950 DEG C in the process, obtains fully austenitic structure, is then transferred into rapid quenching in stamping die and shapes.It is difficult to understand
Family name's body will be completely transformed into martensitic structure, drip molding intensity with higher (tensile strength >=1500MPa), but plasticity compared with
Poor (elongation percentage≤8%).Therefore probing into the new forming technology of boron steel and finding alternative material becomes new direction.Middle manganese
Steel (5-7wt%Mn) has multiphase, metastable, Multi-scale model, can reach higher plasticity and intensity, become advanced high-strength
The Typical Representative of steel.Some researchers attempt to replace boron steel with medium managese steel, and achieve excellent mechanical performance.
However, medium managese steel Sheet Metal Forming Technology is mainly hot rolling/cold-reduced sheet+austenitizing annealing+stamping at present, although hot
Roll/cold-reduced sheet medium managese steel achieves excellent mechanical property compared with boron steel.However there are still some problems: (1) hot rolled plate have compared with
Low yield strength (400-700MPa) and thicker oxide layer lead to poor stamping parts surface quality；(2) cold rolling medium managese steel
With biggish elasticity modulus, although there is excellent surface quality compared with hot rolling, since medium managese steel has in cold-rolled process
Biggish rebound, reduces rolling efficiency；(3) in order to consider the continuity produced, drop stamping medium managese steel austenitizing is moved back at present
The fiery time is often below 10min, however the best heat treatment time of medium managese steel is longer (>=30min), because the short period moves back
Fire, which will lead to C/Mn, cannot get sufficient partition, and austenite content and stability are relatively low, and then can reduce the table of stamping parts
Face quality.
Summary of the invention
The present invention is directed to overcome above-mentioned technological deficiency, manganese TRIP steel and its low temperature process forming in a kind of high-performance are provided
Method, this method by medium managese steel carry out two-phase section rolling, Wen Chong cryogenic forming and Q&P process (quenching partition technique)
It combines, further increases the mechanical performance of stamping parts.The characteristics of process, is rolled by two-phase section, and C/Mn is allowed to mention
Preceding partition, is then handled by subsequent Q&P, allows C/Mn partition again.The manufacturing process improves rolling efficiency and stamping parts
Surface quality, so that the stamping parts intensity height and high comprehensive performance of preparation, meet automobile industry and economize on resources, reduce energy
Consumption, lightweight and the target call for improving crashworthiness.
The technological means that the present invention uses is as follows:
The low temperature process manufacturing process of manganese TRIP steel in a kind of high-performance of the invention, comprising the following steps:
S1: two-phase section rolling
By the medium managese steel ingot casting after cutting, 600~800 DEG C are heated to, keeps the temperature 0.5~1.5h, is carried out at 600~700 DEG C
Two-phase section rolling, is air-cooled to room temperature, obtains the middle manganese TRIP steel plate that nanometer/ultra-fine two-phase section rolls；Wherein, two-phase section rolls
In the process, total deformation is 95~97%；
S2: Wen Chong cryogenic forming
(1) austenitizing is handled
The middle manganese TRIP steel plate that nanometer/ultra-fine two-phase section is rolled, is heated to 600~800 DEG C, keeps the temperature 5~10min,
Manganese TRIP steel plate in obtaining austenitizing treated；
(2) stamping
By austenitizing during treated manganese TRIP steel plate be transferred in stamping die, it is ensured that cooling 50~100 DEG C it
Between, progress is stamping, after 10~30s of pressure maintaining, obtains stamping parts；
Stamping parts is cooled to 180~250 DEG C with mould, the stamping parts after being cooled down；
S3:Q&P process
Stamping parts after cooling is placed in heating furnace, in 250~450 DEG C of 10~30min of heat preservation, room temperature is air-cooled to, obtains
The manganese TRIP steel drip molding into high-performance.
Further, in the step 1, the medium managese steel, the chemical component contained and each chemical component
Mass percent are as follows: C is 0.17~0.25wt.%, and Si is 0.00~0.50wt.%, and Mn is 5.00~7.00wt.%, and Al is
1.00~1.50wt.%, N are 0.014~0.03wt.%, and Nb is 0.00~0.06wt.%, and Mo is 0.00~0.25wt.%,
Surplus is Fe and inevitable impurity.
Further, in the step 1, the two-phase section rolling carries out 6~10 passages using two roller hot-rolling mills
Hot rolling, the middle manganese TRIP steel plate of the two-phase section rolling of obtained nanometer/ultra-fine with a thickness of 1.5~2.5mm.
Further, in the step 1, in order to guarantee two-phase section rolling temperature at 600~700 DEG C, 2 passages of every progress
After hot rolling, carry out melting down reheating at 800~900 DEG C, soaking time is 2~10min.
Further, in (1) of the step S2,600~800 DEG C are heated to, heating rate >=8 DEG C/s.
Further, in (2) of the step S2, in stamping process, using thermocouple to the whole of stamping parts
Temperature carries out tracking and measuring, guarantees the accuracy of temperature.
Further, it in (2) of the step S2, during being transferred to stamping die, is protected using argon gas
Shield, prevents from aoxidizing.
Further, in (2) of the step S2, cooled down 50~100 DEG C, temperature fall time is 3~8s.
Further, in the step S3, the temperature field in the temperature field of heating furnace, the temperature difference≤5 DEG C, heating furnace is relatively equal
Even, the stamping parts performance after capable of guaranteeing cooling is uniform.
Manganese TRIP steel in a kind of high-performance, is prepared using above-mentioned low temperature process manufacturing process.
Manganese TRIP steel in high-performance prepared by the present invention, tensile strength are 1710~1810MPa, yield strength 930
~1300MPa, hardness are 460~530HV, and elongation percentage is 17~19%, and strength and ductility product is 29070~33896MPa%.
Manganese TRIP steel in the high-performance of preparation of the invention, microstructure include martensite, retained austenite and iron element
Body, wherein ferritic percent by volume is 0~25%, and retained austenite is 10~30%, and surplus is martensite, high-performance
Crystallite dimension < 500nm of middle manganese TRIP steel.
The preparation method of manganese TRIP steel low temperature process drip molding, more existing forming work in a kind of high-performance of the invention
Skill, the principle for preparing manganese TRIP steel in high-performance is: the present invention is using (the two-phase section rolling of medium managese steel cryogenic forming processing technology
+ Wen Chong), plate is rolled with austenite, ferrite and martensitic structure before punching press, and crystallite dimension has reached Ultra-fine Grained.Using two
When phase region rolls, austenite reverse transformation and Dynamic Recrystallization of Ferrite occur simultaneously in middle manganese TRIP steel, and this zerolling is led
Cause the formation of stratiform+isometric ferrite and austenite heterogeneous structure.In addition, compared to hot forming, which has
Lower forming temperature, stamping parts have preferable surface quality.It is compared compared with cold forming, which can make height
Strong medium managese steel stamping parts dimensional accuracy with higher.Existing stamping line annealing time is 5min, however medium managese steel is best
Performance annealing time further improves Ovshinsky compared with (>=30min), therefore invention introduces two-phase section rolling and Q&P technique
C/Mn content in body is able to solve the problem that short time annealing causes austenite content and stability deficiency.
The preparation method of manganese TRIP steel low temperature process drip molding, has the advantages that in a kind of high-performance of the invention
(1) it is compared with existing hot rolling and hot forming, which has lower forming temperature, can be more
Energy conservation and environmental protection is conducive to save the cost.
(2) it is compared with boron steel, there is medium managese steel of the present invention multiphase, metastable, Multi-scale model, especially medium managese steel to anneal
The austenite of different stability rank is generated in the process, and then lasting deformation can be generated in deformation process, and then obtain
Excellent mechanical property.
(3) medium managese steel of the present invention uses two-phase section rolling mill practice, the phenomenon that being able to solve hot rolling medium managese steel surface oxidation and
The problem of cold rolling low efficiency.Even more important is that medium managese steel C/Mn in the two-phase section operation of rolling has carried out partition, can be further
The time for shortening C/Mn partition, to indirectly improve ram efficiency.
(4) Q&P technique is applied to punching course, the C/Mn content of austenite on the one hand can be improved, and then improve Ovshinsky
The stability of body；On the other hand, the annealing time that can indirectly shorten punching press, improves the productivity of punching press.
(5) steel of the present invention is not strong to the cooling rate sensibility after warm working, and air-cooled or slow cooling can be used and replace water quenching, from
And helps to reduce part rebound and improve its dimensional accuracy.
The present invention has simple process, forming period short, and operating aspect, energy conservation and environmental protection, even more important is that the present invention obtains
Stamping parts have excellent mechanical property and surface quality, therefore medium managese steel cryogenic forming technique of the present invention be medium managese steel adding
Work provides a new processing method.In conjunction with Q&P technique, the mechanical property and punching press effect of medium managese steel can be further increased
Rate.
Detailed description of the invention
In conjunction with attached drawing and specific implementation method, invention is further described in detail.
Fig. 1 is the SEM organization chart of middle manganese TRIP steel plate before punching press in the embodiment of the present invention 2；
Fig. 2 is the XRD organization chart of middle manganese TRIP steel plate before punching press in the embodiment of the present invention 2；
Fig. 3 is that the middle stamping part properties of sample test of manganese TRIP takes point diagram in the embodiment of the present invention 3；
Fig. 4 is the position middle manganese TRIP stamping part P1 SEM organization chart in the embodiment of the present invention 3；
Fig. 5 is the position middle manganese TRIP stamping part P4 SEM organization chart in the embodiment of the present invention 3；
Fig. 6 is the position middle manganese TRIP stamping part P7 SEM organization chart in the embodiment of the present invention 3.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
Embodiment 1
The low temperature process manufacturing process of manganese TRIP steel in a kind of high-performance carries out cryogenic forming technique using by medium managese steel
(two-phase section rolling+Wen Chong) and Q&P treatment process are handled, and implementation step is as follows:
S1: two-phase section rolling
After medium managese steel ingot casting is heated to 700 DEG C, after keeping the temperature 1h, on two roller hot-rolling mills, 9 passes, rolling are carried out
Temperature is controlled at 600~700 DEG C, after two passes of every progress, is melted down at 800 DEG C and is reheated 5min, obtain 1.5~2.5mm
Thick rolls plate, and total deformation is 95~97%, is then air-cooled to room temperature, and the middle manganese that nanometer/ultra-fine two-phase section rolls is made
TRIP steel plate.
The ingredient of the medium managese steel are as follows: C 0.2wt.%, Si 0.50wt.%, Mn 7.00wt.%, Al are
1.50wt.%, N 0.014wt.%, Nb 0.06wt.%, Mo 0.25wt.%, surplus are Fe and inevitable impurity.
S2: Wen Chong cryogenic forming
(1) austenitizing is handled before punching press:
It is required according to stamping parts size, the middle manganese TRIP steel plate that nanometer/ultra-fine two-phase section rolls is cut into setting
Size, and be put into heating furnace, 700 DEG C are heated to, 8min is kept the temperature, the heating rate of heat-treatment furnace is 8 DEG C/s, obtains austenite
Change manganese TRIP steel plate during treated；
(2) stamping: by austenitizing manganese TRIP steel plate during treated, it is flat that punching press being quickly transferred to using manipulator
Platform, time-consuming 5s, 80 DEG C of temperature drop.Then press machine parameter is set, pressure maintaining forming is carried out, dwell time 20s then takes out punching press
Part is cooled to 200~210 DEG C with mould, the stamping parts after being cooled down.In order to realize the temperature control of punching course, it is whole into
Row thermocouple pinpoints (edge, bottom and central part) thermometric, guarantees the accuracy of temperature.
S3:Q&P process
The stamping parts after cooling being quickly transferred in heating furnace, heating temperature is 400 DEG C, soaking time 20min,
It is air-cooled to arrive room temperature, obtain manganese TRIP steel drip molding in high-performance.
Embodiment 2
Manganese TRIP steel in a kind of high-performance, chemical component and its content are: C 0.20wt.%, Si 0.05wt.%,
Mn is 5.59wt.%, Al 1.22wt.%, N 0.014wt.%, Nb 0.06wt.%, Mo 0.22wt.%, and surplus is
Fe and inevitable impurity.
The low temperature process manufacturing process of manganese TRIP steel in a kind of above-mentioned high-performance, comprising the following steps:
S1: two-phase section rolling
It after the medium managese steel side's ingot cut is heated to 800 DEG C, after keeping the temperature 1h, is quickly transferred on two roller hot-rolling mills, carries out 8
Passage hot rolling, rolling temperature control between 600~700 DEG C, after two passes of every progress, melt down reheating at 800 DEG C
5min, total deformation 97%, rolling 1.5mm it is thick roll plate, be then air-cooled to room temperature, obtain the two-phase section of nanometer/ultra-fine
The middle manganese TRIP steel plate of rolling.
The middle manganese TRIP steel plate that nanometer/ultra-fine two-phase section rolls is prepared in S1 and carries out test analysis, SEM tissue
Figure is shown in Fig. 1, and XRD diagram is shown in Fig. 2.
S2: Wen Chong cryogenic forming
(1) austenitizing is handled before punching press:
It is required according to stamping parts size, the middle manganese TRIP steel plate that nanometer/ultra-fine two-phase section rolls is cut into setting
Size, and be put into heating furnace, 800 DEG C are heated to, 5min is kept the temperature, the heating rate of heat-treatment furnace is 9 DEG C/s, obtains austenite
Change manganese TRIP steel plate during treated；
(2) stamping: by austenitizing manganese TRIP steel plate during treated, it is flat that punching press being quickly transferred to using manipulator
Platform, time-consuming 5s, temperature drop is to 750 DEG C.Then press machine parameter is set, pressure maintaining forming is carried out, dwell time 30s then takes out
Stamping parts is cooled to 180~190 DEG C with mould, the stamping parts after being cooled down.In order to realize the temperature control of punching course, entirely
Cheng Jinhang thermocouple pinpoints (edge, bottom and central part) thermometric, guarantees the accuracy of temperature.
S3:Q&P process
The stamping parts after cooling being quickly transferred in heating furnace, heating temperature is 250 DEG C, soaking time 30min,
It is air-cooled to arrive room temperature, obtain manganese TRIP steel drip molding in high-performance.
Manganese TRIP steel drip molding in high-performance manufactured in the present embodiment, tensile strength 1710MPa, yield strength are
930MPa, elongation percentage 17%, strength and ductility product 29070MPa%.
Embodiment 3
Manganese TRIP steel in a kind of high-performance, ingredient is the same as embodiment 2.
The low temperature process manufacturing process of manganese TRIP steel in a kind of high-performance, with embodiment 2, the difference is that:
By in the S2 in embodiment 1, the middle manganese TRIP steel plate that nanometer/ultra-fine two-phase section rolls is cut into the ruler of setting
It is very little, and be put into heating furnace, 800 DEG C are heated to, 8min is kept the temperature, heat-treatment furnace heating rate is 8 DEG C/s, is then quickly transferred to
Punching press platform, time-consuming 5s, temperature drop is to 700 DEG C, and then fast ram shapes, then pressure maintaining 20s removes stamping parts, cooling with mould
It to 200 DEG C, is then quickly transferred in heating furnace, 450 DEG C of temperature, keeps the temperature 10min, it is air-cooled to arrive room temperature, it obtains in U-shaped high-performance
Manganese TRIP steel drip molding.
Using above-mentioned parameter, manganese TRIP steel drip molding in the U-shaped high-performance of preparation, structure from above as shown in figure 3, select
8 typical positions are taken to carry out Mechanics Performance Testing.Its related mechanical property such as the following table 1:
The mechanical property numerical value of manganese TRIP steel drip molding exemplary position in the U-shaped high-performance of the present invention of table 1
In terms of the mechanical property measured, two-phase section rolls medium managese steel combination Q&P processing, and mechanical property distribution is uniform, surrender
Quite, tensile strength is higher than existing hot forming boron steel, and while proof strength for intensity and the heat treatment of cold rolling medium managese steel,
Stamping parts of the present invention has relatively high elongation percentage, and hardness is more than 460HV, can satisfy present automobile steel to security performance
It is required that.To in the present embodiment, the metallographic structure of position P1, P4, P7 are scanned observation, respectively such as Fig. 4, Fig. 5, Fig. 6, the present invention
Microstructure is martensite, retained austenite and a little ferrite, and crystallite dimension is less than 500nm, has reached ultrafine-grained (UFG) microstructure, and
In three positions of selection, Tissue distribution is more uniform, therefore has obtained more uniform mechanical property.
Claims (12)
1. the low temperature process manufacturing process of manganese TRIP steel in a kind of high-performance, which comprises the following steps:
S1: two-phase section rolling
By the medium managese steel ingot casting after cutting, 600 ~ 800 DEG C are heated to, 0.5 ~ 1.5h is kept the temperature, is rolled in 600 ~ 700 DEG C of progress two-phase sections
System, is air-cooled to room temperature, obtains the middle manganese TRIP steel plate of the ultra-fine two-phase section rolling of nanometer；Wherein, in the two-phase section operation of rolling, always
Deflection is 95 ~ 97%；
S2: Wen Chong cryogenic forming
(1) austenitizing is handled
By the middle manganese TRIP steel plate of the ultra-fine two-phase section rolling of nanometer, 600 ~ 800 DEG C are heated to, 5 ~ 10min is kept the temperature, obtains Ovshinsky
Bodyization manganese TRIP steel plate during treated；
(2) stamping
By austenitizing during treated manganese TRIP steel plate be transferred in stamping die, it is ensured that cooling between 50 ~ 100 DEG C, into
Row is stamping, after 10 ~ 30s of pressure maintaining, obtains stamping parts；
Stamping parts is cooled to 180 ~ 250 DEG C with mould, the stamping parts after being cooled down；
S3:Q&P process
Stamping parts after cooling is placed in heating furnace, in 250 ~ 450 DEG C of 10 ~ 30min of heat preservation, room temperature is air-cooled to, obtains high property
Manganese TRIP steel drip molding in energy.
2. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In rapid S1, the medium managese steel, the mass percent of the chemical component contained and each chemical component are as follows: C is 0.17 ~
0.25wt.%, Si be 0.00 ~ 0.50wt.%, Mn be 5.00 ~ 7.00wt.%, Al be 1.00 ~ 1.50wt.%, N be 0.014 ~
0.03wt.%, Nb are 0.00 ~ 0.06wt.%, and Mo is 0.00 ~ 0.25wt.%, and surplus is Fe and inevitable impurity.
3. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In rapid S1, the two-phase section rolling carries out 6 ~ 10 passage hot rollings, the ultra-fine two-phase of obtained nanometer using two roller hot-rolling mills
Area rolling middle manganese TRIP steel plate with a thickness of 1.5 ~ 2.5mm.
4. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In rapid S1, in order to guarantee that two-phase section rolling temperature at 600 ~ 700 DEG C, after 2 passage hot rollings of every progress, is returned at 800 ~ 900 DEG C
Furnace reheats, and soaking time is 2 ~ 10min.
5. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In (1) of rapid S2,600 ~ 800 DEG C are heated to, heating rate >=8 DEG C/s.
6. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In (2) of rapid S2, in stamping process, tracking and measuring is carried out using bulk temperature of the thermocouple to stamping parts, guarantees temperature
The accuracy of degree.
7. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In (2) of rapid S2, during being transferred to stamping die, protected using argon gas.
8. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In (2) of rapid S2, cool down 50 ~ 100 DEG C, temperature fall time is 3 ~ 8s.
9. the low temperature process manufacturing process of manganese TRIP steel in high-performance as described in claim 1, which is characterized in that the step
In rapid S3, the temperature field of heating furnace, the temperature difference≤5 DEG C.
10. manganese TRIP steel in a kind of high-performance, which is characterized in that using low temperature process described in claim 1 ~ 9 any one
Manufacturing process is prepared.
11. manganese TRIP steel in high-performance as claimed in claim 10, which is characterized in that manganese TRIP steel in the high-performance of preparation
Tensile strength is 1710 ~ 1810MPa, and yield strength is 930 ~ 1300MPa, and hardness is 460 ~ 530HV, and elongation percentage is 17 ~ 19%,
Strength and ductility product is 29070 ~ 33896MPa%.
12. manganese TRIP steel in high-performance as claimed in claim 10, which is characterized in that manganese TRIP steel in the high-performance of preparation,
Its microstructure includes martensite, retained austenite and ferrite, wherein ferritic percent by volume is 0 ~ 25%, remaining difficult to understand
Family name's body is 10 ~ 30%, and surplus is martensite, crystallite dimension < 500nm of manganese TRIP steel in high-performance.
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| CN201910099163.2A CN109735698B (en) | 2019-01-31 | 2019-01-31 | Manganese TRIP steel and its method of low temperature process forming in a kind of high-performance |
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| CN201910099163.2A CN109735698B (en) | 2019-01-31 | 2019-01-31 | Manganese TRIP steel and its method of low temperature process forming in a kind of high-performance |
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| CN109735698B true CN109735698B (en) | 2019-11-19 |
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