CN109735766B - A kind of gradient ultra-fine grained structure low-carbon micro steel-alloy and preparation method thereof - Google Patents
A kind of gradient ultra-fine grained structure low-carbon micro steel-alloy and preparation method thereof Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 58
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 238000005098 hot rolling Methods 0.000 claims abstract description 43
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 239000004615 ingredient Substances 0.000 claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 238000005242 forging Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 229910000734 martensite Inorganic materials 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 19
- 239000007769 metal material Substances 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 8
- 230000007246 mechanism Effects 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 23
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005234 chemical deposition Methods 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001887 electron backscatter diffraction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000002635 electroconvulsive therapy Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002707 nanocrystalline material Substances 0.000 description 1
- 238000005289 physical deposition Methods 0.000 description 1
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- 238000004886 process control Methods 0.000 description 1
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- 238000005549 size reduction Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of gradient ultra-fine grained structure low-carbon micro steel-alloy and preparation method thereof, belongs to metal material processing preparation technical field.The ingredient and its mass percent that the gradient ultra-fine grained structure low-carbon micro steel-alloy includes are as follows: C 0.08~0.15%, Mn 0.5~1.5%, Si 0~1.0%, Nb 0~0.05%, Ti 0~0.1%, surplus are Fe and inevitable impurity.Plate in asynchronous hot rolling, is heated to 950~1200 DEG C, keeps the temperature 10~30min, product is made in water quenching to room temperature by preparation method, including melting, forging, conventional hot rolling and asynchronous hot rolling.This method combination asymmetrical rolling compression shear multiple mechanism and strain-induced ferritic phase variable mechanism, introduce strain gradient and dynamic phase trasnsition gradient, while obtaining Ultra-fine Grained crystal grain, obtain the tissue morphology of thickness direction crystallite dimension distribution gradient, and then the intensity and hardness of metal material are effectively increased while keeping metal material plasticity and toughness, improve the comprehensive performance of material.
Description
Technical field
The invention belongs to metal material processing preparation technical fields, and in particular to a kind of micro- conjunction of gradient ultra-fine grained structure low-carbon
Jin Gang and preparation method thereof.
Background technique
Plasticity, toughness and the forming property of raising high-strength steel or super-high strength steel are the emphasis of " Iron & Steel Material of New Generation " research
Direction.As the representative of " Iron & Steel Material of New Generation ", ultra-fine grain steel has significant Strengthening and Toughening feature, passes through the ultra-fine of crystal grain
Change while realizing the rising of intensity and the improvement of toughness, in automotive energy-saving emission-reducing, reduces building structural steel amount etc. with good
Application prospect.However, the generation of a large amount of defects is inevitable during the fine of crystal grain, along with strength level
Significantly improve, plasticity, toughness and the work hardening capacity of material would generally reduce, between this intensity-plasticity/toughness "
Set " relationship has become a big bottleneck of high-intensitive or superhigh intensity steel material development.
The modification side that gradient-structure (such as crystallite dimension, lamellar spacing) is a kind of metal material is introduced in metal material
Method makes metal material show the high intensity and high rigidity performance of Ultra-fine Grained/nanocrystalline, at the same retain the plasticity of coarse structure with
Toughness can preferably solve the problems, such as Ultra-fine Grained/nanocrystalline material toughness plasticity, realize the perfect matching of intensity and plasticity.Closely
Nian Lai, many scholars have carried out extensive research work around Gradient Materials.
Currently, realizing crystallite dimension distribution gradient in metal material, can be deformed and gradient physics by post deformation failure
Or chemical deposition preparation.
Post deformation failure deformation prepares gradient-structure mainly by carrying out severe plastic deformation to metal surface, due to load
Effect is gradually reduced along depth direction, and Plastic Deformation of Surface Layer degree is maximum, and dependent variable is gradually reduced along depth direction, causes in material
Material surface has been deformed into the layered structure of ultra-fine crystal layer, deformation coarse-grain layer and coarse-grain matrix along depth direction.Represent technology as
High pressure torsion, surface mechanical attrition, high-speed shot blasting impact and the technologies such as laser impact intensified.Such method is mainly by material
The coarse-grain surface layer of material carries out severe plastic deformation, and open grain structure is caused gradually to be refined to Ultra-fine Grained, nanocrystalline.Surface layer ultra fine crystal layer
Tissue and matrix are not in separate and take off between function-graded material surface layer and matrix without apparent boundary layer
The phenomenon that falling.But post deformation failure deformation method has certain limitation, as samples after high-speed shot blasting shock treatment, surface
Quality (such as roughness) is deteriorated with the increase of plastic deformation, has an adverse effect to the mechanical property of material.In addition, being become
The gradient-structure layer of the limitation of shape depth, post deformation failure deformation preparation only has several hundred microns (100~300 μm), can not prepare big
Size gradient structure, industrial applications limited promise.Also, this method is higher to the shape need of sample, is only applicable to Cu, IF
Steel, stainless steel etc. have the material of preferable plasticity.
Physically or chemically deposition method is to control deposition materials by controlling physically or chemically sedimentary dynamic process to gradient
Structure and ingredient, realize the change of gradient of structure or ingredient.Thickness of sample and grain size gradient are adjustable, for example, logical
Control electrochemical deposition parameter is crossed, pure Ni sample of the crystallite dimension from 10nm change of gradient to some tens of pm can be prepared.It is common
Physical deposition method have sputtering sedimentation, laser deposition etc., common chemical deposition has chemical vapor deposition (CVD), electricity
Chemical deposition etc..But some defects are inevitably generated in physically or chemically deposition process, such as internal stress and impurity segregation,
Have an adverse effect to material property, this external equipment is complex, higher cost.
Also some methods for preparing gradient-structure in metal surface, such as patent are disclosed in existing technology
CN105821180A discloses a kind of metal surface and constructs coarse-grain-fine grain gradient-structure method, using Laser surface heat treatment,
It is obtained from outward appearance to inner essence by regulation laser parameter, the gradient-structure of even grain size reduction.But process control is more
Complexity needs to handle sample surfaces, laser facula, overlapping rate, sweep speed, laser power etc. before Laser surface heat treatment
Parameter, which needs to cooperate between a certain range, could form good size gradient structure, in addition, being confined to sample in heat
It cannot be undergone phase transition when processing, be unfavorable for applying the steel material for being prone to phase transformation in heat treatment.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of gradient ultra-fine grained structure low-carbon micro steel-alloy and its
Preparation method.This method combination asymmetrical rolling compression shear multiple mechanism and strain-induced ferritic phase variable mechanism, introduce in the sample
Strain gradient and dynamic phase trasnsition gradient obtain thickness direction crystallite dimension distribution gradient while obtaining Ultra-fine Grained crystal grain
Tissue morphology, and then in the intensity and hardness for keeping metal material plasticity and toughness while to effectively increase metal material,
Improve the comprehensive performance of material.
A kind of gradient ultra-fine grained structure low-carbon micro steel-alloy of the invention, it includes ingredient and each ingredient quality hundred
Point ratio are as follows: it is 0.5~1.5% that C, which be 0.08~0.15%, Mn, and it is 0~0.05% that Si, which is 0~1.0%, Nb, Ti for 0~
0.1%, surplus is Fe and inevitable impurity.
Preferably, the gradient ultra-fine grained structure low-carbon micro steel-alloy, it includes ingredient and each ingredient matter
Measure percentage are as follows: C 0.12%, Mn 1.35%, Si 0.49%, Nb 0.035%, Ti 0.019%, surplus be Fe and
Inevitable impurity.
The gradient ultra-fine grained structure low-carbon micro steel-alloy, tissue are ultra-fine dynamic phase trasnsition ferrite and disperse point
The granular martensite of cloth；Along hot rolled plate thickness direction, ferritic average grain size is from 0.60~0.80 μm of gradient transition
To 2~3 μm of scales, the transition from sub-micron to micro-meter scale is realized.
The gradient ultra-fine grained structure low-carbon micro steel-alloy, tensile strength are 900~1005MPa, and yield strength is
620~780MPa, elongation percentage are 16~22%, and uniform elongation is 13~18%, and yield tensile ratio is 0.7~0.8.
A kind of preparation method of gradient ultra-fine grained structure low-carbon micro steel-alloy of the invention, melting, step including step 1
2 forging, the conventional hot rolling of step 3 and step 4 asynchronous hot rolling, wherein the asynchronous hot rolling of step 4, technological parameter are as follows: will
Plate after hot rolling is heated to 950~1200 DEG C, keeps the temperature 10~30min, carries out asynchronous hot rolling, and gradient is made in water quenching to room temperature
Ultra-fine grained structure low-carbon micro steel-alloy；Wherein, in asynchronous hot rolling, the finishing temperature of asynchronous hot rolling is 750~850 DEG C, upper roller
Linear velocity and lower roll linear velocity differ 1.3~2 times, and overall reduction is 50%~75%.
Wherein,
In the melting of the step 1, specific steps are as follows: according to gradient ultra-fine grained structure low-carbon micro steel-alloy chemistry at
Divide and proportion, ingredient after mixing raw material, in 1600~1700 DEG C of progress meltings, cast and obtain ingot casting；
In the step 1, the melting uses vacuum induction melting furnace.
In the forging of the step 2, specific steps are as follows: ingot casting is heated to 1100~1250 DEG C, keeps the temperature 2~4h, forging
It makes, is air-cooled to room temperature, square ingot is carried out machining, the square ingot after being cut by the side's of obtaining ingot；
In the step 2, the square ingot that 30~40mm of thickness is obtained to cut square ingot is cut；
In the conventional hot rollings of the step 3, by the square ingot after cutting, 1000~1200 DEG C are heated to, keeps the temperature 1~3h,
Hot rolling, the plate after obtaining hot rolling；Wherein, in course of hot rolling, total deformation is 80~90%；
In the step 3, the hot rolling, using two roller hot-rolling mills, start rolling temperature is 1150 DEG C, and finishing temperature is
870 DEG C, the rolling pass of hot rolling is 6~8 passage hot rollings, the plate after obtained hot rolling with a thickness of 4~8mm.
In the asynchronous hot rolling of the step 4, the passage of asynchronous hot rolling is 1 passage.
The gradient ultra-fine grained structure low-carbon micro steel-alloy is gradient ultra-fine grained structure low-carbon microalloy steel plate, thickness
For 1.20~2.00mm.
A kind of gradient ultra-fine grained structure low-carbon micro steel-alloy of the invention and preparation method thereof forms gradient Ultra-fine Grained knot
The principle of structure are as follows: it is compound with strain-induced ferritic phase variable mechanism in conjunction with asymmetrical rolling compression shear, it introduces and answers in plate thickness direction
Become gradient and dynamic phase trasnsition gradient obtains thickness direction crystallite dimension distribution gradient while obtaining ultra-fine grained ferrite
Tissue, i.e., along hot rolled plate thickness direction, ferritic average grain size is from 0.60~0.80 μm of gradient transition to 2~3 μ
M scale realizes the transition from sub-micron to micro-meter scale, to make metal material while have both ultra-fine/nanocrystalline high-strength
The plasticity and toughness of degree and coarse structure, improve the comprehensive performance of material.
The present invention is about a kind of gradient ultra-fine grained structure low-carbon micro steel-alloy and preparation method thereof, compared with prior art,
It has the advantages that
Gradient ultra-fine grained structure low-carbon micro steel-alloy produced by the invention is combined with phase transformation using deformation for the first time, is passed through
The compression shear multiple mechanism of asymmetrical rolling introduces strain gradient in steel plate thickness direction, promotes ferrite that dynamic phase trasnsition gradient occurs,
Have many advantages, such as simple production process, it is with short production cycle, energy saving, reduce cost；The mechanical property of steel plate that it is prepared is excellent
Good, with excellent obdurability, (tensile strength 960MPa, elongation percentage is up to 22%), and yield tensile ratio is 0.7, with traditional hot-rolled steel
Plate compares the advantage with strength and ductility product, has both excellent work hardening capacity and forming property.
Detailed description of the invention
Fig. 1 is the gold of the gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness prepared in the embodiment of the present invention 1
Phase micro-organization chart；
Fig. 2 is the crystalline substance of the gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness prepared in the embodiment of the present invention 1
Particle size statistical chart；
Fig. 3 is the gold of the gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness prepared in the embodiment of the present invention 2
Phase micro-organization chart；
Fig. 4 is the crystalline substance of the gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness prepared in the embodiment of the present invention 2
Particle size statistical chart；
Fig. 5 is the gold of the gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness prepared in the embodiment of the present invention 3
Phase micro-organization chart；
Fig. 6 is the crystalline substance of the gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness prepared in the embodiment of the present invention 3
Particle size statistical chart；
Fig. 7 is the gradient ultra-fine grained structure low-carbon microalloy steel plate of the preparation of the embodiment of the present invention 1 along strain gradient direction
EBSD figure；
Fig. 8 is the gradient ultra-fine grained structure low-carbon micro steel-alloy lath particle size of the preparation of the embodiment of the present invention 1 with thickness
Changing rule.
Specific embodiment
The invention will be further described With reference to embodiment, and it is not intended to limit the protection scope of the present invention.
Embodiment 1
A kind of gradient ultra-fine grained structure low-carbon microalloy steel plate, it includes chemical component and each chemical component quality
Percentage is: C 0.12%, Mn 1.35%, Si 0.49%, Nb 0.035%, Ti 0.019%, and surplus is for Fe and not
Evitable impurity.
A kind of preparation method of gradient ultra-fine grained structure low-carbon microalloy steel plate, specifically includes the following steps:
(1) melting: by the chemical component and composition ingredient of above-mentioned gradient ultra-fine grained structure low-carbon microalloy steel plate, and by its
It is added in vacuum induction melting furnace, in 1650 DEG C of temperature meltings, casting obtains 50kg billet；
(2) it forges: by 50kg billet, at 1150 DEG C, keeping the temperature 3h, forging is air-cooled to room temperature, obtains 100mm × side 100mm
Ingot, is cut into 30mm × 100mm × 100mm for square ingot, the square ingot after being cut；
(3) after the square ingot after cutting is heated to 1200 DEG C, after keeping the temperature 2h, 6 conventional hot rolling: are carried out on two roller hot-rolling mills
Passage hot rolling obtains the hot rolled plate of 6mm thickness, total deformation 80%；
(4) asynchronous hot rolling: by the hot rolled plate of 6mm thickness, being heated to 1200 DEG C, keep the temperature 15min, carries out asymmetrical rolling, eventually
Rolling temperature is 800 DEG C, the heat transfer machine that asymmetrical rolling uses, and the roller diameter ratio of two roller is 2:1, and the linear velocity of upper roller is under
Roller linear velocity differs 2 times, carries out 1 passage asymmetrical rolling, and drafts 75% obtains the steel plate of 1.35mm thickness, and then water quenching is extremely
Gradient ultra-fine grained structure low-carbon microalloy steel plate is made in room temperature.
Gradient ultra-fine grained structure low-carbon microalloy steel plate manufactured in the present embodiment, tensile strength 1005MPa, surrender are strong
Degree is 780MPa, elongation percentage 18.1%, uniform elongation 13.5%, yield tensile ratio 0.73.
Gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness 1/8 (a) manufactured in the present embodiment, 2/8 (b), 3/8
(c), 4/8 (d), 5/8 (e), 6/8 (f), 7/8 (g) sees Fig. 1 with metallographic microstructure corresponding to 8/8 (h) region, and gradient is ultra-fine
The crystallite dimension statistics of crystal structure low-carbon microalloy steel plate through-thickness is shown in Fig. 2.
Gradient ultra-fine grained structure low-carbon microalloy steel plate manufactured in the present embodiment is analyzed, along strain gradient direction
EBSD figure see Fig. 7, Fig. 7 be preparation gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness crystal grain distribution figure,
It can be seen that change of gradient is presented in its partial size.
Gradient ultra-fine grained structure low-carbon micro steel-alloy lath particle size manufactured in the present embodiment is shown in the changing rule of thickness
Fig. 8, as can be seen from Figure 8, along hot rolled plate thickness direction, ferritic average grain size is from 0.60~0.80 μm of gradient
Be transitioned into 2~3 μm of scales, realize the transition from sub-micron to micro-meter scale, thus make metal material at the same have both it is ultra-fine/receive
The high intensity of meter Jing and the plasticity and toughness of coarse structure, improve the comprehensive performance of material.
Embodiment 2
A kind of gradient ultra-fine grained structure low-carbon microalloy steel plate, by the identical melting of same embodiment 1, forging, conventional heat
After rolling, hot rolled steel plate is heated 950 DEG C, keeps the temperature 15min, in 800 DEG C of progress asymmetrical rollings, roller diameter ratio is 2:1, and drafts is
75%, the steel plate of 1.50mm thickness is obtained, then water quenching to room temperature, gradient ultra-fine grained structure low-carbon microalloy steel plate is made.Its power
Learn performance parameter are as follows: tensile strength 937MPa, yield strength 662MPa, elongation percentage 21.6%, uniform elongation are
18%, yield tensile ratio 0.71.Gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness 1/8 (a) manufactured in the present embodiment,
2/8 (b), 3/8 (c), 4/8 (d), 5/8 (e), 6/8 (f), 7/8 (g) sees figure with metallographic microstructure corresponding to 8/8 (h) region
3, the crystallite dimension statistics of Hot Rolled Samples through-thickness is shown in Fig. 4.
Embodiment 3
A kind of gradient ultra-fine grained structure low-carbon microalloy steel plate, by the identical melting of same embodiment 1, forging, conventional heat
After rolling, hot rolled steel plate is heated 950 DEG C, keeps the temperature 15min, in 750 DEG C of progress asymmetrical rollings, roller diameter ratio is 2:1, and drafts is
75%, the steel plate of 1.50mm thickness is obtained, then water quenching to room temperature, gradient ultra-fine grained structure low-carbon microalloy steel plate is made.Its power
Learn performance parameter are as follows: tensile strength 905MPa, yield strength 628MPa, elongation percentage 16.8%, uniform elongation are
13.4%, yield tensile ratio 0.73.Gradient ultra-fine grained structure low-carbon microalloy steel plate through-thickness 1/8 manufactured in the present embodiment
(a), 2/8 (b), 3/8 (c), 4/8 (d), 5/8 (e), 6/8 (f), 7/8 (g) and 8/8 (h) region corresponding to metallographic microstructure
See Fig. 5, the crystallite dimension statistics of Hot Rolled Samples through-thickness is shown in Fig. 6.
Claims (10)
1. a kind of gradient ultra-fine grained structure low-carbon micro steel-alloy, which is characterized in that the gradient ultra-fine grained structure low-carbon micro steel-alloy
The mass percent of the ingredient and each ingredient that include are as follows: it be 0.5 ~ 1.5%, Si is that 0 ~ 1.0%, Nb is that C, which is 0.08 ~ 0.15%, Mn,
0 ~ 0.05%, Ti are 0 ~ 0.1%, and surplus is Fe and inevitable impurity；The gradient ultra-fine grained structure low-carbon micro steel-alloy,
Its granular martensite organized as ultra-fine dynamic phase trasnsition ferrite and Dispersed precipitate；Along hot rolled plate thickness direction, ferrite
Average grain size from 0.60 ~ 0.80 μm of gradient transition to 2 ~ 3 μm of scales, realize the mistake from sub-micron to micro-meter scale
It crosses.
2. gradient ultra-fine grained structure low-carbon micro steel-alloy as described in claim 1, which is characterized in that the gradient Ultra-fine Grained
Structure low-carbon micro steel-alloy, it includes ingredient and each ingredient mass percent are as follows: C 0.12%, Mn 1.35%, Si are
0.49%, Nb 0.035%, Ti 0.019%, surplus are Fe and inevitable impurity.
3. gradient ultra-fine grained structure low-carbon micro steel-alloy as described in claim 1, which is characterized in that the gradient Ultra-fine Grained
Structure low-carbon micro steel-alloy, tensile strength are 900 ~ 1005MPa, and yield strength is 620 ~ 780MPa, and elongation percentage is 16 ~ 22%,
Uniform elongation is 13 ~ 18%, and yield tensile ratio is 0.7 ~ 0.8.
4. the preparation method of the gradient ultra-fine grained structure low-carbon micro steel-alloy as described in claim 1 ~ 3 any one, feature
Be, the forging of melting, step 2 including step 1, the conventional hot rolling of step 3 and step 4 asynchronous hot rolling, wherein step 4
Asynchronous hot rolling, technological parameter are as follows:
Plate after hot rolling is heated to 950 ~ 1200 DEG C, keeps the temperature 10 ~ 30min, carries out asynchronous hot rolling, water quenching to room temperature is made
Gradient ultra-fine grained structure low-carbon micro steel-alloy；Wherein, in asynchronous hot rolling, the finishing temperature of asynchronous hot rolling is 750 ~ 850 DEG C, upper roller
Linear velocity and lower roll linear velocity differ 1.3 ~ 2 times, overall reduction be 50% ~ 75%.
5. the preparation method of gradient ultra-fine grained structure low-carbon micro steel-alloy as claimed in claim 4, which is characterized in that described
In the melting of step 1, specific steps are as follows: according to the chemical component and proportion of gradient ultra-fine grained structure low-carbon micro steel-alloy, ingredient,
After raw material is mixed, in 1600 ~ 1700 DEG C of progress meltings, casting obtains ingot casting.
6. the preparation method of gradient ultra-fine grained structure low-carbon micro steel-alloy as claimed in claim 4, which is characterized in that described
In the forging of step 2, specific steps are as follows: ingot casting is heated to 1100 ~ 1250 DEG C, keeps the temperature 2 ~ 4h, forging is air-cooled to room temperature, obtains
To square ingot, square ingot is subjected to machining, the square ingot after being cut.
7. the preparation method of gradient ultra-fine grained structure low-carbon micro steel-alloy as claimed in claim 6, which is characterized in that described
In step 2, the square ingot that 30 ~ 40mm of thickness is obtained to cut square ingot is cut.
8. the preparation method of gradient ultra-fine grained structure low-carbon micro steel-alloy as claimed in claim 4, which is characterized in that described
In the conventional hot rolling of step 3, by the square ingot after cutting, 1000 ~ 1200 DEG C are heated to, keeps the temperature 1 ~ 3h, hot rolling, after obtaining hot rolling
Plate；Wherein, in course of hot rolling, total deformation is 80 ~ 90%.
9. the preparation method of the gradient ultra-fine grained structure low-carbon micro steel-alloy as described in claim 4 or 8, which is characterized in that institute
The conventional hot rolling for the step 3 stated, using two roller hot-rolling mills, start rolling temperature is 1150 DEG C, and finishing temperature is 870 DEG C, and hot rolling is rolled
Passage processed is 6 ~ 8 passage hot rollings, plate after obtained hot rolling with a thickness of 4 ~ 8mm.
10. the preparation method of gradient ultra-fine grained structure low-carbon micro steel-alloy as claimed in claim 4, which is characterized in that described
Step 4 asynchronous hot rolling in, the passage of asynchronous hot rolling is 1 passage.
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| PCT/CN2019/075161 WO2020155197A1 (en) | 2019-01-31 | 2019-02-15 | Gradient ultra-fine grained low-carbon micro-alloy steel and preparation method therefor |
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| JPH101740A (en) * | 1996-06-12 | 1998-01-06 | Kobe Steel Ltd | Ultrahigh strength steel sheet excellent in delayed fracture resistance, and its production |
| JPH11293424A (en) * | 1998-04-07 | 1999-10-26 | Nkk Corp | Silicon steel sheet having high saturation magnetic flux density and high-frequency iron loss |
| CN106756547A (en) * | 2016-12-12 | 2017-05-31 | 东北大学 | A kind of yield strength 500MPa grades of cold-rolled steel sheet and preparation method thereof |
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| JP4577999B2 (en) * | 2001-01-25 | 2010-11-10 | 新日本製鐵株式会社 | Low C-Mn ultrafine grain steel and method for producing the same |
| CN1273633C (en) * | 2003-06-24 | 2006-09-06 | 宝山钢铁股份有限公司 | Low-carbon low-alloyed dual-phase steel plate with ultra-fine grain structure and method for producing same |
| CN100419109C (en) * | 2005-11-04 | 2008-09-17 | 东北大学 | Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel |
| CN105177460B (en) * | 2014-12-29 | 2017-12-12 | 高军 | A kind of method for preparing unimach using the multiple brilliant means of control |
| CN105821180B (en) * | 2016-04-07 | 2018-09-04 | 浙江工贸职业技术学院 | Metal material surface constructs the method and gradient-structure of coarse-grain-fine grain gradient-structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH101740A (en) * | 1996-06-12 | 1998-01-06 | Kobe Steel Ltd | Ultrahigh strength steel sheet excellent in delayed fracture resistance, and its production |
| JPH11293424A (en) * | 1998-04-07 | 1999-10-26 | Nkk Corp | Silicon steel sheet having high saturation magnetic flux density and high-frequency iron loss |
| CN106756547A (en) * | 2016-12-12 | 2017-05-31 | 东北大学 | A kind of yield strength 500MPa grades of cold-rolled steel sheet and preparation method thereof |
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| 滚压诱导梯度超细晶结构的研究;李宁;《中国博士论文全文数据库工程科技I辑》;20160415;第123页 * |
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