CN106498292A - One kind is containing manganese automotive sheet in V, Ti and Nb and preparation method thereof - Google Patents
One kind is containing manganese automotive sheet in V, Ti and Nb and preparation method thereof Download PDFInfo
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- CN106498292A CN106498292A CN201610927995.5A CN201610927995A CN106498292A CN 106498292 A CN106498292 A CN 106498292A CN 201610927995 A CN201610927995 A CN 201610927995A CN 106498292 A CN106498292 A CN 106498292A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0231—Warm rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
One kind is containing manganese automotive sheet in V, Ti and Nb and preparation method thereof.Containing manganese automotive sheet in V, Ti and Nb, composition is by weight percentage：C：0.1～0.3%, Si：0.3～3.5%, Mn：3.0～15.0%, Al：1.0～3.5%, V≤0.2%, Ti≤0.2%, Nb≤0.2%, balance of Fe and impurity, steel plate 590～970MPa of yield strength, 980～1440MPa of tensile strength, breaking elongation 30～42%, more than strength and ductility product 40GPa%；Preparation method is, steel billet is obtained by composition proportion, after heating and thermal insulation, hot rolling obtains hot rolled steel plate, and by hot rolled steel plate water quenching to room temperature after, carry out rolling rear heat treatment, carry out heating and thermal insulation again, carry out warm-rolling afterwards, carry out rolling rear heat treatment by warm-rolling steel plate, water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.The present invention is by the setting of heat treatment process parameter, it is ensured that warm-rolling steel plate has the plasticity that high intensity is become reconciled concurrently, so as to obtain outstanding strength and ductility product.
Description
Technical field：
The invention belongs to high-strength high-plasticity temperature technical field of steel rolling, and in particular to a kind of containing manganese automobile use in V, Ti and Nb
Steel plate and preparation method thereof.
Background technology：
At present, the progress of automobile industry and development are put forward higher requirement to energy-saving and environmental protection.Both at home and abroad to automobile steel
Research carried out substantial amounts of R＆D work.There is tensile strength and the breaking elongation of the third generation automobile steel of High-strength high-plasticity
Product reach more than 30GP, such steel causes the very big emerging of researcher due to its higher strength and ductility product and its good ductility
Interest.In recent years, many scholars are more to research that manganese mass fraction is 4～12% both at home and abroad, with the first generation and second filial generation automobile
Steel is compared, its preferable combination property and relatively low alloy content and be identified as preferable third generation automobile steel.
The design of middle manganese automobile steel alloying component is reported in a large number, mainly for C, Mn, Al and Si in these documents
Impact of the change of constituent content to its microstructure and mechanical property.And use of Nb, V, Ti microalloy element in steel is few
Have been reported that.This experiment steel is to the addition of Nb, V, Ti element on the basis of common medium managese steel so as to form the nitridation of carbon, nitrogen or carbon
Compound, by controlled rolling make microalloy element by precipitation strength so as to further improve experiment steel mechanical property.Conventional
Hot-rolling method can not meet the precipitation condition of microalloy element, and the method for utilizing high-temperature region controlled rolling and two-phase section warm-rolling,
Can make that precipitate is separated out in a large number and pinning austenite grain boundary is so as to refining the crystal grain and tissue of steel；Additionally, by the temperature of two-phase section
Rolling, not only obtains stable retained austenite and ultra-fine grained ferrite crystal grain, and significantly reduces material in the operation of rolling
The resistance of deformation and roll-force of material, it is to avoid the problem of Cracking caused because resistance of deformation is excessive in cold-rolled process.
China is vanadium and titanium resources big country, in conjunction with China's vanadium and titanium resources, expands vanadium titanium use range, and exploitation has higher intensity
There is development prospect well with the third generation automobile steel of toughness.For the proposition of problem above, the present invention is intended that with being suitable for containing
The milling method of V, Ti and Nb element medium managese steel, by high temperature controlled rolling and controlled cooling and two-phase section rolling make V, Ti and Nb fully separate out from
And the comprehensive mechanical property of steel is further improved, reference is provided for developing multi items automobile steel.
Content of the invention：
For the problem that prior art is present, the present invention provides a kind of containing manganese automotive sheet and its preparation in V, Ti and Nb
Method, by high-temperature control rolling make microalloy element separate out so as to crystal grain thinning, while, there is provided warm-rolling plate roll rear heat treatment
Technique has preferable tensile strength and elongation percentage with respect to other cold rolling middle manganese automobile steels, it is to avoid because of rolling that much higher hard is caused
By the Technology for Heating Processing, system difficulty and the difficult problem for easily ftractureing, ensure that warm-rolling steel plate has the plasticity that high intensity is become reconciled concurrently,
So as to obtain outstanding strength and ductility product.
The present invention containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.1～
0.3%, Si：0.3～3.5%, Mn：3.0～15.0%, Al：1.0～3.5%, V≤0.2%, Ti≤0.2%, Nb≤
0.2%, balance of Fe and impurity, steel plate yield strength be 590～970MPa, tensile strength be 980～1440MPa, overall elongation
Rate is 30～42%, and strength and ductility product reaches more than 40GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, after being smelted into molten steel, steel billet is obtained；
Step 2：Hot rolling：
(1) front heat treatment is rolled：By heating steel billet to 1200～1350 DEG C, 2～5h is incubated；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, wherein, breaking down temperature is 1100～1200 DEG C, finish to gauge
Temperature is 900～1100 DEG C, and hot rolled steel plate thickness is 3～4mm；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Step 3：Roll rear heat treatment：
(1) heat：Steel plate after hot rolling water quenching is heated to 600～750 DEG C, l～1.5h is incubated, water quenching is to room temperature；
(2) it is tempered：Steel plate after by water quenching is tempered, 200～450 DEG C of temperature, and tempering insulation time 10～
20min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 550～750 DEG C, is incubated 2～10min；
(2) warm-rolling：Carry out, after warm-rolling, being air cooled to room temperature by heat-treated steel plate, warm-rolling steel plate is obtained；Wherein, warm-rolling is first
Temperature is rolled for 650～750 DEG C, finishing temperature is 550～650 DEG C, and warm-rolling steel plate thickness is l～1.5mm；
Step 5：Roll rear heat treatment：
Warm-rolling steel plate is heated to after 650～750 DEG C, after 3～10min of insulation；Water quenching is obtained and contains V, Ti and Nb to room temperature
Middle manganese automotive sheet；
In described step 1, the operation of melting molten steel is carried out in converter, electric furnace or induction furnace.
In described step 1, steel billet is prepared from by the one kind in following two modes：
(1) pouring molten steel is made after steel ingot, by Heating Steel Ingots to 1200～1350 DEG C, is incubated 2～5h, forging is obtained steel
Base；
(2) molten steel continuous casting is obtained steel billet.
In described step 2 (1), heating operation is carried out in heating furnace；
In described step 3 (1), heating operation is carried out in heating furnace；
In described step 4 (1), heating operation is carried out in heating furnace；
In described step 5, heating operation is carried out in heating furnace；
Beneficial effects of the present invention：
(1) the middle manganese automobile steel that the present invention is provided, it is ensured that the generation of a large amount of austenites；V, Ti and Nb microalloy element
Addition, make the intensity of material be further improved.
(2) present invention adopts the technique of warm-rolling to rolled steel plate, and the deformation for not only reducing material in the operation of rolling resists
Power and roll-force, and steel plate can be made to obtain austenite stable in a large number, the hardness for solving invar in cold-rolled process is high, rolls
The problem of Cracking that power processed is excessive and causes, it is easy to accomplish industrialized production.Compared with cold-rolled steel, warm-rolling steel has preferably comprehensive
Mechanical property.
After testing, the obtained yield strength containing manganese automotive sheet in V, Ti and Nb of this method is 590～970MPa, resists
Tensile strength is 980～1440MPa, and breaking elongation is 30～42%, and strength and ductility product reaches more than 40GPa%.
Description of the drawings：
Fig. 1 is that the thermal expansion containing manganese automotive sheet in V, Ti and Nb prepared by the embodiment of the present invention 1 and embodiment 8 is bent
Line；Wherein
A () is the thermal dilatometry containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 1；
B () is the thermal dilatometry containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 8；
Fig. 2 be the embodiment of the present invention 1 and embodiment 8 prepare containing each phase Phase Proportion in manganese automotive sheet in V, Ti and Nb
Calculating simulation phasor；Wherein：
(a) be embodiment 1 prepare containing each phase Phase Proportion calculating simulation phasor in manganese automotive sheet in V, Ti and Nb；
(b) be embodiment 8 prepare containing each phase Phase Proportion calculating simulation phasor in manganese automotive sheet in V, Ti and Nb；
Fig. 3 is the SEM image of steel plate after hot rolling water quenching in the embodiment of the present invention 1,2,3 and 8；Wherein：
A () is the SEM image of steel plate after hot rolling water quenching in embodiment 1；
B () is the SEM image of steel plate after hot rolling water quenching in embodiment 2；
C () is the SEM image of steel plate after hot rolling water quenching in embodiment 3；
D () is the SEM image of steel plate after hot rolling water quenching in embodiment 8；
SEM images of the Fig. 4 for 1,2,3 and 8 warm-rolling steel plate of the embodiment of the present invention；Wherein：
A () is the SEM image of warm-rolling steel plate in embodiment 1；
B () is the SEM image of warm-rolling steel plate in embodiment 2；
C () is the SEM image of warm-rolling steel plate in embodiment 3；
D () is the SEM image of warm-rolling steel plate in embodiment 8；
Fig. 5 is the stress-strain diagram containing manganese automotive sheet in V, Ti and Nb prepared by the embodiment of the present invention 1,2,3 and 8
Image；Wherein：
A () is the stress-strain curve diagram picture containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 1；
B () is the stress-strain curve diagram picture containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 2；
C () is the stress-strain curve diagram picture containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 3；
D () is the stress-strain curve diagram picture containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 8；
Fig. 6 be the embodiment of the present invention 1,2,3 and 8 prepare containing manganese automotive sheet work hardening rate curve in V, Ti and Nb
Image；Wherein：
A () is the work hardening rate curve image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 1；
B () is the work hardening rate curve image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 2；
C () is the work hardening rate curve image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 3；
D () is the work hardening rate curve image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 8；
Fig. 7 is the TEM shape appearance figures containing manganese automotive sheet in V, Ti and Nb prepared by the embodiment of the present invention 1,2 and 8；Its
In：
A () is the bright field image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 1；
B () is the dark field image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 1；
C () is the bright field image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 2,
D () is the dark field image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 2；
E () is the bright field image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 8,
F () is the dark field image containing manganese automotive sheet in V, Ti and Nb prepared by embodiment 8；
Fig. 8 be the embodiment of the present invention 1,2,3 and 8 prepare containing manganese automotive sheet V, Ti precipitate in V, Ti and Nb
SEM feature images；Wherein：
A () is the SEM feature images containing V, Ti precipitate of manganese automotive sheet in V, Ti and Nb prepared by embodiment 1；
B () is the SEM feature images containing V, Ti precipitate of manganese automotive sheet in V, Ti and Nb prepared by embodiment 2；
C () is the SEM feature images containing V, Ti precipitate of manganese automotive sheet in V, Ti and Nb prepared by embodiment 3；
D () is the SEM feature images containing V, Ti precipitate of manganese automotive sheet in V, Ti and Nb prepared by embodiment 8；
Wherein, the black portions that dotted line is irised out are V, Ti precipitate；
V, Ti precipitate energy spectrum diagram containing manganese automotive sheet in V, Ti and Nb prepared by (e) embodiment 8；
Fig. 9 be the embodiment of the present invention 1,2,3 and 8 prepare containing manganese automotive sheet residual austenite content in V, Ti and Nb
XRD figure picture；Wherein：
(a) be embodiment 1 prepare containing manganese automotive sheet residual austenite content XRD figure picture in V, Ti and Nb；
(b) be embodiment 2 prepare containing manganese automotive sheet residual austenite content XRD figure picture in V, Ti and Nb；
(c) be embodiment 3 prepare containing manganese automotive sheet residual austenite content XRD figure picture in V, Ti and Nb；
(d) be embodiment 8 prepare containing manganese automotive sheet residual austenite content XRD figure picture in V, Ti and Nb；
Figure 10 be the embodiment of the present invention 2 prepare containing manganese automotive sheet V, Ti precipitate EPMA patterns in V, Ti and Nb
Figure；Wherein：
A prepared by () embodiment 2 schemes containing V, Ti and Nb Zhong Meng automotive sheets displaing micro tissue topography；
B prepared by () embodiment 2 separates out scattergram containing manganese automotive sheet Ti in V, Ti and Nb；
C prepared by () embodiment 2 separates out scattergram containing manganese automotive sheet V in V, Ti and Nb；
Figure 11 be the embodiment of the present invention 3 prepare containing manganese automotive sheet C, Mn partition EPMA shape appearance figures in V, Ti and Nb,
Wherein：
A prepared by () embodiment 3 schemes containing V, Ti and Nb Zhong Meng automotive sheets displaing micro tissue topography；
(b) embodiment 3 prepare containing manganese automotive sheet Mn concentration profiles in V, Ti and Nb；
(c) embodiment 3 prepare containing manganese automotive sheet C concentration profiles in V, Ti and Nb；
Figure 12 be the embodiment of the present invention 2 and 4 prepare containing manganese automotive sheet impact fracture pattern in V, Ti and Nb；Its
In：
(a) embodiment 2 prepare containing manganese automotive sheet impact fracture pattern in V, Ti and Nb；
(b) embodiment 4 prepare containing manganese automotive sheet impact fracture pattern in V, Ti and Nb.
Specific embodiment：
With reference to embodiment, the present invention is described in further detail.
This patent combines the composition proportion of third generation automobile slab, is detected using optical microscope, scanning electron microscope and XRD etc.
Tissue and mechanical property of the warm-rolling medium managese steel after V, Ti and Nb element after different temperatures heat treatment are added in technical research.
Particular embodiments described above has been carried out further to technical scheme, embodiment and beneficial effect
Describe in detail, the be should be understood that specific embodiment that the foregoing is only the present invention is not limited to this
Bright, all any modification, equivalent substitution and improvements that within the spirit and principles in the present invention, is done etc. should be included in the present invention
Protection domain within；
Mechanics Performance Testing is carried out to obtained containing manganese automotive sheet in V, Ti and Nb, operating process is as follows：
Step 1：According to GB/T228-2002 " metal material tensile testing at ambient temperature " by obtained containing V, Ti and Nb in
Manganese automotive sheet is processed into tensile sample, sets draw speed 3mm/min, first fixes electronic extensometer before stretching, stretches
Process is automatically controlled by computer program；
Step 2：Sample is cut along rolling direction, is ground with the carborundum water-proof abrasive paper of 120～1200#, is placed in woollen
Polish on polishing cloth, subsequently dry up with water and alcohol rinse and using hair-dryer, carried out with 20～25% sodium sulfite solution
Etching pit；
Step 3：With field emission microscopy observation hot-rolled steel and the tissue of warm-rolling steel rolling；Use transmission electron microscope observing precipitate
Pattern and size；
Embodiment 1
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.1%,
Si：0.3%, Mn：3.0%, Al：1.0%, V：0.01%, Ti：0.05%, Nb：0.2%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 590MPa, tensile strength is 980MPa, and breaking elongation is 42%, and strength and ductility product reaches 41.16GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, molten steel is smelted in converter, by pouring molten steel system
Into after steel ingot, by Heating Steel Ingots to 1200 DEG C, 5h is incubated, forging is obtained steel billet, and steel billet sectional area is 100 × 10mm；
Step 2：Hot rolling：
(1) front heat treatment is rolled：By steel billet in heating furnace, 1200 DEG C are heated to, are incubated 3h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 3mm；Wherein, breaking down temperature is
1100 DEG C, finishing temperature is 900 DEG C, and hot rolling reduction ratio is 70%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Shown in the SEM image of the steel plate after hot rolling water quenching such as Fig. 3 (a)；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 600 DEG C are heated to, are incubated lh, water quenching is to room temperature；
(2) it is tempered：Steel plate after by water quenching is tempered, 200 DEG C of temperature, tempering insulation time 10min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 550 DEG C in heating furnace, is incubated 2min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
lmm；Wherein, the breaking down temperature of warm-rolling is 650 DEG C, and finishing temperature is 550 DEG C, and warm-rolling reduction ratio is 60%；
Shown in the SEM image of warm-rolling steel plate such as Fig. 4 (a)；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 650 DEG C, 3min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
To carrying out correlated performance test containing manganese automotive sheet in V, Ti and Nb obtained in the present embodiment, its thermal dilatometry
As shown in Fig. 1 (a)；Shown in each phase Phase Proportion calculating simulation phasor such as Fig. 2 (a)；Shown in stress-strain diagram such as Fig. 5 (a)；Processing
Shown in hardening ratio curve such as Fig. 6 (a)；Shown in bright field image in TEM shape appearance figures such as Fig. 7 (a)；Dark field image in TEM shape appearance figures is such as
Shown in Fig. 7 (b)；Shown in SEM shape appearance figures such as Fig. 8 (a) of V, Ti precipitate；Shown in residual austenite content XRD figure such as Fig. 9 (a).
Embodiment 2
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.15%,
Si：0.3%, Mn：5.0%, Al：1.3%, V：0.04%, Ti：0.03%, Nb：0.12%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 630MPa, tensile strength is 1040MPa, and breaking elongation is 38%, and strength and ductility product reaches 39.52GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, molten steel is smelted in converter, by pouring molten steel system
Into after steel ingot, ingot casting is heated to 1220 DEG C, is incubated 4h, forging is obtained steel billet, and steel billet sectional area is 100 × 12mm；
Step 2：Hot rolling：
(2) front heat treatment is rolled：By steel billet in heating furnace, 1240 DEG C are heated to, are incubated 5h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 3mm；Wherein, breaking down temperature is
1120 DEG C, finishing temperature is 920 DEG C, and hot rolling reduction ratio is 74%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Shown in the SEM image of the steel plate after hot rolling water quenching such as Fig. 3 (b)；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 620 DEG C are heated to, are incubated lh, water quenching is to room temperature；
(2) it is tempered：Steel plate after by water quenching is tempered, 240 DEG C of temperature, tempering insulation time 12min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 580 DEG C in heating furnace, is incubated 3min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
lmm；Wherein, the breaking down temperature of warm-rolling is 655 DEG C, and finishing temperature is 560 DEG C, and warm-rolling reduction ratio is 66.6%；
Shown in the SEM image of warm-rolling steel plate such as Fig. 4 (b)；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 660 DEG C, 5min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
To carrying out correlated performance test, stress-strain diagram containing manganese automotive sheet in V, Ti and Nb obtained in the present embodiment
As shown in Fig. 5 (b)；Shown in work hardening rate curve such as Fig. 6 (b)；Shown in bright field image in TEM shape appearance figures such as Fig. 7 (c)；TEM shapes
Shown in dark field image in looks figure such as Fig. 7 (d)；Shown in SEM shape appearance figures such as Fig. 8 (b) of V, Ti precipitate；Residual austenite content
Shown in XRD figure such as Fig. 9 (b)；Shown in V, Ti steel microscopic structure shape appearance figure such as Figure 10 (a)；Ti separates out scattergram such as Figure 10 (b) institutes
Show；V is separated out shown in scattergram such as Figure 10 (c)；Shown in impact fracture pattern such as Figure 12 (a).
Embodiment 3
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.18%,
Si：1.0%, Mn：8.0%, Al：1.6%, V：0.03%, Ti：0.08%, Nb：0.15%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 692MPa, tensile strength is 1150MPa, and breaking elongation is 36%, and strength and ductility product reaches 41.4GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, be smelted into molten steel in electric furnace, by pouring molten steel into
Ingot casting is heated to 1280 DEG C by steel ingot, is incubated 2h, and forging is obtained steel billet, and steel billet sectional area is 100 × 14mm；
Step 2：Hot rolling：
(3) front heat treatment is rolled：By steel billet in heating furnace, 1280 DEG C are heated to, are incubated 5h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 3.2mm；Wherein, breaking down temperature
For 1140 DEG C, finishing temperature is 940 DEG C, and hot rolling reduction ratio is 78%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Shown in the SEM image of the steel plate after hot rolling water quenching such as Fig. 3 (c)；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 630 DEG C are heated to, l.1h, water quenching is to room temperature for insulation；
(2) it is tempered：Steel plate after by water quenching is tempered, 300 DEG C of temperature, tempering insulation time 13min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 600 DEG C in heating furnace, is incubated 4min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
l.1mm；Wherein, the breaking down temperature of warm-rolling is 670 DEG C, and finishing temperature is 580 DEG C, and warm-rolling reduction ratio is 68.7%；
Shown in the SEM image of warm-rolling steel plate such as Fig. 4 (c)；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 680 DEG C, 6min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
To carrying out correlated performance test, stress-strain diagram containing manganese automotive sheet in V, Ti and Nb obtained in the present embodiment
As shown in Fig. 5 (c)；Shown in work hardening rate curve such as Fig. 6 (c)；Shown in SEM shape appearance figures such as Fig. 8 (c) of V, Ti precipitate；Residual
Shown in remaining austenite content XRD figure such as Fig. 9 (c)；Shown in V, Ti steel microscopic structure shape appearance figure such as Figure 11 (a)；Mn concentration profiles
As shown in Figure 11 (b)；Shown in C concentration profiles such as Figure 11 (c).
Embodiment 4
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.2%,
Si：1.0%, Mn：10.0%, Al：2.6%, V：0.05%, Ti：0.01%, Nb：0.1%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 720MPa, tensile strength is 1250MPa, and breaking elongation is 35%, and strength and ductility product reaches 43.75GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, be smelted into molten steel in electric furnace, by pouring molten steel into
Ingot casting is heated to 1250 DEG C by steel ingot, is incubated 3h, and forging is obtained steel billet, and steel billet sectional area is 100 × 18mm；
Step 2：Hot rolling：
(4) front heat treatment is rolled：By steel billet in heating furnace, 1300 DEG C are heated to, are incubated 2.5h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 3.2mm；Wherein, breaking down temperature
For 1150 DEG C, finishing temperature is 950 DEG C, and hot rolling reduction ratio is 82%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 650 DEG C are heated to, l.2h, water quenching is to room temperature for insulation；
(2) it is tempered：Steel plate after by water quenching is tempered, 320 DEG C of temperature, tempering insulation time 15min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 620 DEG C in heating furnace, is incubated 5min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
l.2mm；Wherein, the breaking down temperature of warm-rolling is 680 DEG C, and finishing temperature is 600 DEG C, and warm-rolling reduction ratio is 70.5%；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 700 DEG C, 7min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
Obtained containing manganese automotive sheet impact fracture pattern such as Figure 12 (b) in V, Ti and Nb Suo Shi.
Embodiment 5
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.24%,
Si：1.8%, Mn：11.0%, Al：2.4%, V：0.1%, Ti：0.15%, Nb：0.08%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 793MPa, tensile strength is 1300MPa, and breaking elongation is 34%, and strength and ductility product reaches 44.2GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, molten steel is smelted in induction furnace, by pouring molten steel
After making steel ingot, ingot casting is heated to 1300 DEG C, is incubated 3.5h, forging is obtained steel billet, and steel billet sectional area is 100 × 20mm；
Step 2：Hot rolling：
(5) front heat treatment is rolled：By steel billet in heating furnace, 1260 DEG C are heated to, are incubated 2h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 3.5mm；Wherein, breaking down temperature
For 1160 DEG C, finishing temperature is 960 DEG C, and hot rolling reduction ratio is 86%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 680 DEG C are heated to, l.3h, water quenching is to room temperature for insulation；
(2) it is tempered：Steel plate after by water quenching is tempered, 350 DEG C of temperature, tempering insulation time 16min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 650 DEG C in heating furnace, is incubated 6min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
l.3mm；Wherein, the breaking down temperature of warm-rolling is 700 DEG C, and finishing temperature is 610 DEG C, and warm-rolling reduction ratio is 71.4%；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 710 DEG C, 8min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
Embodiment 6
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.26%,
Si：1.8%, Mn：12.0%, Al：4.2%, V：0.14%, Ti：0.18%, Nb：0.06%, balance of Fe and impurity, steel plate
Yield strength is 810MPa, and tensile strength is 1330MPa, and breaking elongation is 32%, and strength and ductility product reaches 42.56GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, molten steel is smelted in induction furnace, by pouring molten steel
Into steel ingot, ingot casting is heated to 1340 DEG C, is incubated 2.5h, forging is obtained steel billet, and steel billet sectional area is 100 × 24mm；
Step 2：Hot rolling：
(6) front heat treatment is rolled：By steel billet in heating furnace, 1350 DEG C are heated to, are incubated 3.5h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 3.8mm；Wherein, breaking down temperature
For 1180 DEG C, finishing temperature is 980 DEG C, and hot rolling reduction ratio is 90%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 700 DEG C are heated to, l.4h, water quenching is to room temperature for insulation；
(2) it is tempered：Steel plate after by water quenching is tempered, 400 DEG C of temperature, tempering insulation time 18min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 700 DEG C in heating furnace, is incubated 7min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
l.4mm；Wherein, the breaking down temperature of warm-rolling is 720 DEG C, and finishing temperature is 620 DEG C, and warm-rolling reduction ratio is 73.6%；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 730 DEG C, 9min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
Embodiment 7
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.28%,
Si：3.5%, Mn：14.0%, Al：3.0%, V：0.16%, Ti：0.2%, Nb：0.02%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 889MPa, tensile strength is 1400MPa, and breaking elongation is 31%, and strength and ductility product reaches 43.4GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, molten steel is smelted in induction furnace, by pouring molten steel
Into steel ingot, ingot casting is heated to 1350 DEG C, is incubated 2h, forging is obtained steel billet, and steel billet sectional area is 100 × 28mm；
Step 2：Hot rolling：
(7) front heat treatment is rolled：By steel billet in heating furnace, 1320 DEG C are heated to, are incubated 4h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 4mm；Wherein, breaking down temperature is
1200 DEG C, finishing temperature is 1050 DEG C, and hot rolling reduction ratio is 94%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 720 DEG C are heated to, l.4h, water quenching is to room temperature for insulation；
(2) it is tempered：Steel plate after by water quenching is tempered, 420 DEG C of temperature, tempering insulation time 20min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 720 DEG C in heating furnace, is incubated 8min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
l.5mm；Wherein, the breaking down temperature of warm-rolling is 740 DEG C, and finishing temperature is 640 DEG C, and warm-rolling reduction ratio is 75%；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 740 DEG C, 10min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
Embodiment 8
The present embodiment containing manganese automotive sheet in V, Ti and Nb, its composition is respectively by weight percentage：C：0.3%,
Si：3.5%, Mn：15.0%, Al：3.5%, V：0.2%, Ti：0.1%, Nb：0.01%, balance of Fe and impurity, steel plate are bent
Intensity is taken for 970MPa, tensile strength is 1440MPa, and breaking elongation is 30%, and strength and ductility product reaches 43.2GPa%.
The above-mentioned preparation method containing manganese automotive sheet in V, Ti and Nb, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, molten steel is smelted in induction furnace, by molten steel continuous casting
Into steel billet, steel billet sectional area is 100 × 30mm；
Step 2：Hot rolling：
(8) front heat treatment is rolled：By steel billet in heating furnace, 1340 DEG C are heated to, are incubated 2.5h；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, hot rolled steel plate thickness is 4mm；Wherein, breaking down temperature is
1200 DEG C, finishing temperature is 1100 DEG C, and hot rolling reduction ratio is 95%；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
After hot rolling water quenching shown in the SEM image of steel plate such as Fig. 3 (d)；
Step 3：Roll rear heat treatment：
(1) heat：By the steel plate after hot rolling water quenching in heating furnace, 750 DEG C are heated to, l.5h, water quenching is to room temperature for insulation；
(2) it is tempered：Steel plate after by water quenching is tempered, 450 DEG C of temperature, tempering insulation time 20min；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 750 DEG C in heating furnace, is incubated 10min；
(2) warm-rolling：Heat-treated steel plate is carried out warm-rolling, room temperature is air cooled to, warm-rolling steel plate is obtained, warm-rolling steel plate thickness is
l.5mm；Wherein, the breaking down temperature of warm-rolling is 750 DEG C, and finishing temperature is 650 DEG C, and warm-rolling reduction ratio is 80%；
Shown in the SEM image of warm-rolling steel plate such as Fig. 4 (d)；
Step 5：Roll rear heat treatment：
(1), by warm-rolling steel plate in heating furnace, after being heated to 750 DEG C, 10min is incubated,
(2) water quenching is obtained containing manganese automotive sheet in V, Ti and Nb to room temperature.
To carrying out correlated performance test containing manganese automotive sheet in V, Ti and Nb obtained in the present embodiment, its thermal dilatometry
As shown in Fig. 1 (b)；Shown in each phase Phase Proportion calculating simulation phasor such as Fig. 2 (b)；
Shown in stress-strain diagram such as Fig. 5 (d)；Shown in work hardening rate curve such as Fig. 6 (d)；Light field in TEM shape appearance figures
As shown in Fig. 7 (e)；Shown in dark field image in TEM shape appearance figures such as Fig. 7 (f)；SEM shape appearance figures such as Fig. 8 (d) of V, Ti precipitate
Shown；Wherein, the black portions that dotted line is irised out are V, Ti precipitate；Shown in V, Ti precipitate energy spectrum diagram such as Fig. 8 (e)；Remaining difficult to understand
Shown in family name's body content XRD figure such as Fig. 9 (a).
Claims (8)
1. a kind of containing manganese automotive sheet in V, Ti and Nb, it is characterised in that its composition is respectively by weight percentage：C：0.1
～0.3%, Si：0.3～3.5%, Mn：3.0～15.0%, Al：1.0～3.5%, V≤0.2%, Ti≤0.2%, Nb≤
0.2%, balance of Fe and impurity, described is 590～970MPa containing manganese automotive sheet yield strength in V, Ti and Nb, and tension is strong
Spend for 980～1440MPa, breaking elongation is 30～42%, and strength and ductility product reaches more than 40GPa%.
2. the preparation method containing manganese automotive sheet in V, Ti and Nb as claimed in claim 1, comprises the following steps：
Step 1：Prepared by steel billet：
By the composition proportion containing manganese automotive sheet in V, Ti and Nb, after being smelted into molten steel, steel billet is obtained；
Step 2：Hot rolling：
(1) front heat treatment is rolled：By heating steel billet to 1200～1350 DEG C, 2～5h is incubated；
(2) hot rolling：Steel billet is carried out hot rolling, hot rolled steel plate is obtained, wherein, breaking down temperature is 1100～1200 DEG C, finishing temperature
For 900～1100 DEG C, hot rolled steel plate thickness is 3～4mm；
(3) water quenching：After rolling, water quenching immediately is obtained steel plate after hot rolling water quenching to room temperature；
Step 3：Roll rear heat treatment：
(1) heat：Steel plate after hot rolling water quenching is heated to 600～750 DEG C, l～1.5h is incubated, water quenching is to room temperature；
(2) it is tempered：Steel plate after by water quenching is tempered, 200～450 DEG C of temperature, 10～20min of tempering insulation time；
(3) air cooling：Steel plate after being tempered, is air cooled to room temperature；
Step 4：Warm-rolling：
(1) front heat treatment is rolled：Steel plate after by air cooling is heated to 550～750 DEG C, is incubated 2～10min；
(2) warm-rolling：Carry out, after warm-rolling, being air cooled to room temperature by heat-treated steel plate, warm-rolling steel plate is obtained；Wherein, the breaking down temperature of warm-rolling
Spend for 650～750 DEG C, finishing temperature is 550～650 DEG C, warm-rolling steel plate thickness is l～1.5mm；
Step 5：Roll rear heat treatment：
Warm-rolling steel plate is heated to after 650～750 DEG C, after 3～10min of insulation, water quenching is obtained containing manganese in V, Ti and Nb to room temperature
Automotive sheet.
3. the preparation method containing manganese automotive sheet in V, Ti and Nb according to claim 2, it is characterised in that described
In step 1, steel billet is prepared from by the one kind in following two modes：
(1) pouring molten steel is made after steel ingot, by Heating Steel Ingots to 1200～1350 DEG C, is incubated 2～5h, forging is obtained steel billet；
(2) molten steel continuous casting is obtained steel billet.
4. the preparation method containing manganese automotive sheet in V, Ti and Nb according to claim 2, it is characterised in that described
In step 1, the operation of melting molten steel is carried out in converter, electric furnace or induction furnace.
5. the preparation method containing manganese automotive sheet in V, Ti and Nb according to claim 2, it is characterised in that described
In step 2 (1), heating operation is carried out in heating furnace.
6. the preparation method containing manganese automotive sheet in V, Ti and Nb according to claim 2, it is characterised in that described
In step 3 (1), heating operation is carried out in heating furnace.
7. the preparation method containing manganese automotive sheet in V, Ti and Nb according to claim 2, it is characterised in that described
In step 4 (1), heating operation is carried out in heating furnace.
8. the preparation method containing manganese automotive sheet in V, Ti and Nb according to claim 2, it is characterised in that described
In step 5, heating operation is carried out in heating furnace.
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| WO2019134102A1 (en) * | 2018-01-05 | 2019-07-11 | The University Of Hong Kong | An automotive steel and a method for the fabrication of the same |
| CN110055465A (en) * | 2019-05-16 | 2019-07-26 | 北京科技大学 | A kind of middle manganese unimach and preparation method thereof |
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