CN107974631A - A kind of method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel - Google Patents
A kind of method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel Download PDFInfo
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- CN107974631A CN107974631A CN201711246316.9A CN201711246316A CN107974631A CN 107974631 A CN107974631 A CN 107974631A CN 201711246316 A CN201711246316 A CN 201711246316A CN 107974631 A CN107974631 A CN 107974631A
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- C21D8/0226—Hot rolling
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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
- C21D8/0236—Cold rolling
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses a kind of method that various dimensions strengthen plasticising production high strength and ductility superhigh intensity third generation automobile steel, belong to new material technology field.This method reverse-engineers the carbon chromium manganese niobium micro-alloy steel kind system for developing low-alloy content with performance, based on proposing principle and the applicable elements to develop second phase particles enhancing plasticising based on this, coordinate the technical strategies of the various dimensions enhancing plasticising of structure refinement and heterogeneous structure design, ensure that steel material realizes the raising of plasticity under the conditions of superhigh intensity, break through the technical barrier for realizing the intensity of steel material and the high performance of plasticity at the same time, so as in the level of more than 1200MPa tensile strength, realize that strength and ductility product reaches the high strength and ductility target of more than 20GPa%.The present invention prepares superhigh intensity high strength and ductility automobile steel using number of mechanisms under the conditions of existing weaponry and equipment, is a kind of low cost, low energy consumption, is easily achieved, is adapted to the new method of third generation automobile steel large-scale industrial production.
Description
Technical field
The invention belongs to new material technology field, and in particular to one kind enhancing plasticising production high strength and ductility superhigh intensity the 3rd
For the method for automobile steel, specifically for the exploitation of third generation automobile steel, meet vehicle safety and light-weighted requirement.
Background technology
Superhigh intensity automobile steel of the tensile strength more than 1000MPa grades is mainly used for automobile member cabin and collision prevention girders etc.
Important feature parts, play vehicle safety conclusive effect.In general, the lifting of the strength of materials is often with sacrifice
Plasticity is cost.Therefore, the Plastic phase of the strong automobile steel of existing superelevation is to relatively low, with currently used first generation automobile steel
Exemplified by DP980 and DP1180 etc., its elongation percentage is often less than 10%.Thus, the problem of causing two can not be ignored：1) superelevation is strong
It is difficult to spend deformation and the shape components of steel, easily occurs the problems such as fracture, rebound and die wear in forming process；2) automobile
The ability that parts absorb strong impact energy in collision process reduces, and it is disrumpent feelings and cause personnel to injure to be also easy to produce structure.
How to realize that plasticity lifting of the automobile steel under the conditions of superhigh intensity becomes one of research hotspot both domestic and external,
In current research work, relatively typical steel grade mainly quench-matches somebody with somebody steel splitting and medium managese steel in third generation automobile steel, but
It is to need enormous investment to transform special high-strength steel production line in quenching-matching somebody with somebody division technique；And medium managese steel production technology difficulty is big, because
This above-mentioned indivedual iron and steel enterprise of the current depolarization of technology path can be produced outside the product of relatively low intensity rank, not in industrial production
In obtain large-scale production promotion and application.Patent of invention (201310121568.4,201310520580.2,
201510498959.7) main preparation and the heat treatment method for having applied for quenching partition (QP) steel such as.Patent of invention
(201610490062.4,201510112679.8) etc. relate generally to the preparation method and correlation of the austenite reverse transformation of medium managese steel
Technological parameter.Plasticity lifting mainly passes through retained austenite phase change induction plasticity or twinning-induced modeling in these technology paths
Property mechanism, do not refer to the various dimensions enhancing plasticising using a variety of antiplasticization mechanism complex effects come under the conditions of improving superhigh intensity
The problem of plasticity, also do not solve composition design and technological design from cold rolled annealed technique and the general character method of heat forming technology
Crucial Science and Technology problem.
The content of the invention
For overcome the deficiencies in the prior art, the technical problem to be solved in the present invention is propose a kind of various dimensions enhancing plasticising life
The method for producing high strength and ductility superhigh intensity third generation automobile steel, this method is based on existing industrial production equipment and technology bar
Part, it is proposed that by Nb/Ti microalloyings, utilize the quantitative coordination between second phase particles Size Distribution and matrix refinement
Effect, makes second phase particles change into enhancing plasticising from traditional dispersion-strengtherning, coordinates on this basis with structure refinement and more
Various dimensions enhancing plasticising is realized in phase constitution regulation and control.
In order to solve the above technical problems, the present invention is achieved by the following technical programs.
A kind of method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel, this method pass through
Zerolling, cold rolled annealed and ageing treatment are realized；Or by zerolling, hot forming and interrupt quenching realization.
The component of the third generation automobile steel, by percentage to the quality, carbon content are 0.15~0.30%, and chromium content is
1.5~3.0%, manganese content 1.5~3.5%, content of niobium is 0.03~0.12%, and Ti content is 0.01~0.05%, nitrogen content
For 0.002~0.004%, silicone content is 0.05~1.0%.
The zerolling temperature is 850~900 DEG C；The cold rolled annealed temperature is 700~1000 DEG C；At the timeliness
Manage 300~500 DEG C of temperature；The hot forming heating-up temperature is 930 DEG C；The interruption hardening heat is 300 DEG C~400 DEG C.
Technical scheme is mainly designed from Alloying Design, Second Phase Precipitation and structure refinement and heterogeneous structure
Realize various dimensions enhancing plasticising.
Regulated and controled according to second phase particles, the needs of structure refinement and heterogeneous structure regulation and control, to meet performance as target
Carry out the reverse engineer of alloy system and component, comprehensive main adding elements to quenching degree, strengthen effect, delay carbide to be formed
And many action characteristics such as inoxidizability, complete to close from component-tissue-processing conditions-property-cost multifactor
Gold design.Based on above-mentioned cognition, according to characteristic of elements and its analysis result of the affecting laws regulated and controled to heterogeneous structure, it is proposed that
C-Cr-Mn-Nb alloy system design philosophys, main component system are：Phosphorus content for 0.15%-0.30% (percetage by weight, with
Similarly hereinafter), chromium content 1.5%-3.0%, manganese content 1.5%-3.5%, content of niobium 0.03%-0.12%, Ti content are
0.01%-0.05%, nitrogen content 0.002%-0.004%, silicone content 0.05%-1.0%.
The second phase particles enhancing plasticising proposed in the present invention is the reciprocation research in dislocation and second phase particles
On the basis of propose, the thought started based on dislocation source, realizes that second phase particles enhancing plasticising needs specific condition.The present invention
It is proposed first, in order to realize that the enhancing of second phase particles is plasticized, it is desirable to which second phase particles are mainly by TiN and NbC and its is compound
Particle form, its size should at 10-60 nanometers, matrix effective particle size under conditions of 3-10 microns, second
The interparticle distance of phase particle should be controlled at 0.3-3 microns；
Structure refinement proposed by the present invention, is to refine austenite by the controlled rolling and control cooling of course of hot rolling
Crystallite dimension.By the way that in the controlled rolling and control cooling procedure of course of hot rolling, using zerolling, rolling temperature is 850
DEG C -900 DEG C, the design of rolling procedure, it is desirable to which the crystallite dimension of austenite should control following at 0.5-5 microns during finish to gauge.
The heterogeneous structure design proposed by the present invention mainly design including ferritic phase and retained austenite phase.Matrix
For lath martensite.The ferrite that 0-10% volume fractions can be introduced according to performance requirement plays strain coordination raising plasticity
Effect is, it is necessary to which the retained austenite for introducing 5-30% volume fractions plays the purpose of phase change induction plasticity or twinning-induced phase transformation.
The design of this heterogeneous structure can be by cold rolled annealed technique, and the requirement adjusted according to strong plasticity, its heating-up temperature is 700
DEG C -1000 DEG C, 300 DEG C -500 DEG C of aging temp.Quenching can also be interrupted by hot forming to realize, its interruption hardening heat is
300℃-400℃。
Various dimensions enhancing plasticising is realized according to above-mentioned second phase particles design, structure refinement design and heterogeneous structure design
The method for producing high strength and ductility superhigh intensity third generation automobile steel.
The technical principle of the present invention：
The present invention is using high strength and ductility superhigh intensity automobile steel as target, it is proposed that utilizes second phase particles (zero dimension) and position
Reciprocation-second phase particles enhancing plasticising between wrong (one-dimensional), reciprocation-group of the crystal boundary (two dimension) between dislocation
Knit refinement enhancing plasticising, and the strain coordination of heterogeneous structure (three-dimensional) and induced plasticity-heterogeneous structure design enhancing plasticising phase
With reference to realize various dimensions enhancing plasticising.From technical principle, steel material has been transferred in various dimensions enhancing plasticising may realize modeling
Property enhancing number of mechanisms, utilize number of mechanisms complex effect plasticising.Wherein, using mutual between second phase particles and matrix
Cooperation realizes that mobile dislocation source propagation is a kind of innovative technique thought and achievement in research.
Compared with prior art, the present invention has following technique effect：
1st, the mechanism of various enhancing plasticising in steel material is taken full advantage of, the required high level of single mechanism is reduced and closes
Aurification designs or/and high producing equipment input, is a kind of low cost, low energy consumption, is easily achieved, suitable large-scale industrial production pushes away
The new method of wide and application third generation automobile steel research and development.
2nd, a kind of new technical method for realizing enhancing plasticising at the same time using second phase particles is established.
3rd, by various dimensions proposed by the present invention enhancing plasticising the intensity of automobile steel can be made to reach 1200~1500MPa
Superhigh intensity it is horizontal, strength and ductility product reaches more than 20GPa%.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment, but the present invention is not limited to following embodiments.
Embodiment 1
0.2%C-1.8%Mn-1.5%Cr-0.03Nb experiment steel is selected, forging stock thickness, width and length are respectively
30th, 120 and 360 millimeters.By 900 DEG C of steel plates for being hot-rolled down to 4 mm of thickness.Then 2 mm of thickness are cold-rolled to.Its martensite is opened
Beginning transition temperature is 430 DEG C.Hot forming after cold-reduced sheet is heated to 930 DEG C, interrupts quenching, its microstructure is lath at 350 DEG C
Martensite and 6% retained austenite.Its tensile strength of tension test is 1300MPa, elongation 16%, strength and ductility product 21GPa%.
Embodiment 2
Select 0.2C-1.8%Mn-1.5%Cr-0.03Nb experiment steel, forging stock thickness, width and length is respectively 30,
120 and 360 millimeters.By 900 DEG C of steel plates for being hot-rolled down to 4 mm of thickness.Then 2 mm of thickness are cold-rolled to.Using continuous annealing
Technique, 850 DEG C are heated, after 300 DEG C of timeliness.Its tensile strength of tension test is 1240MPa, elongation 20%, strength and ductility product
25GPa%.
Embodiment 3
Select 0.2C-1.8%Mn-1.5%Cr-0.06Nb experiment steel, forge base thickness, width and length be respectively 30,
120 and 360 millimeters.By 850 DEG C of steel plates for being hot-rolled down to 4 mm of thickness.Then 2 mm of thickness are cold-rolled to.Using continuous annealing
Technique, 850 DEG C are heated, after 300 DEG C of timeliness.Its tensile strength of tension test is 1430MPa, elongation 21%, strength and ductility product
30GPa%.
Claims (2)
- A kind of 1. method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel, it is characterised in that This method is realized by zerolling, cold rolled annealed and ageing treatment；The component of the third generation automobile steel, by percentage to the quality, carbon content are 0.15~0.30%, chromium content 1.5 ~3.0%, manganese content 1.5~3.5%, content of niobium is 0.03~0.12%, and Ti content is 0.01~0.05%, and nitrogen content is 0.002~0.004%, silicone content is 0.05~1.0%；The zerolling temperature is 850~900 DEG C；The cold rolled annealed temperature is 700~1000 DEG C；300~500 DEG C of the aging temperature.
- A kind of 2. method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel, it is characterised in that This method is by zerolling, hot forming and interrupts quenching realization；The component of the third generation automobile steel, by percentage to the quality, carbon content are 0.15~0.30%, chromium content 1.5 ~3.0%, manganese content 1.5~3.5%, content of niobium is 0.03~0.12%, and Ti content is 0.01~0.05%, and nitrogen content is 0.002~0.004%, silicone content is 0.05~1.0%；The zerolling temperature is 850~900 DEG C；The hot forming heating-up temperature is 930 DEG C；The interruption hardening heat is 300 DEG C~400 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735022A (en) * | 2019-11-20 | 2020-01-31 | 安徽工业大学 | High-strength-ductility ultrahigh-strength automobile steel with cold and hot forming flexibility application |
| CN113198928A (en) * | 2021-04-25 | 2021-08-03 | 安徽工业大学 | Hot-stamping forming part with strength of 2GPa and strength-elongation product of 20GPa% and manufacturing method thereof |
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| Publication number | Publication date |
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| CN107974631B (en) | 2019-07-30 |
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