CN107974631B - 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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- 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
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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
- C21D8/0226—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
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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
- C22C38/18—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
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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
- C21D2211/008—Martensite
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Abstract
The invention discloses a kind of methods that various dimensions enhance 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 service performance, based on proposing principle and the applicable elements to develop second phase particles enhancing plasticising based on this, cooperate the technical strategies of the various dimensions enhancing plasticising of structure refinement and heterogeneous structure design, guarantee that steel material realizes the raising of plasticity under the conditions of superhigh intensity, break through while realizing the technical problem of the intensity of steel material and the high performance of plasticity, to in the level of 1200MPa or more tensile strength, realize that strength and ductility product reaches the high strength and ductility target of 20GPa% or more.The present invention prepare 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, the new method of suitable third generation automobile steel large-scale industrial production.
Description
Technical field
The invention belongs to new material technology fields, and in particular to a kind of enhancing plasticising production high strength and ductility superhigh intensity third
Meet vehicle safety and light-weighted requirement specifically for the exploitation of third generation automobile steel for the method for automobile steel.
Background technique
Tensile strength is mainly used for automobile member cabin and collision prevention girders etc. in 1000MPa grades or more of superhigh intensity automobile steel
Important feature components play conclusive effect to vehicle safety.In general, the promotion of the strength of materials is often to 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
For DP980 and DP1180 etc., elongation percentage is often less than 10%.The problem of causing two can not be ignored as a result: 1) superelevation is strong
Deformation and the shape components for spending steel are difficult, are easy occur the problems such as fracture, rebound and die wear in forming process；2) automobile
The ability that components absorb strong impact energy in collision process reduces, and is also easy to produce structure fracture and causes personal injury.
How to realize that plasticity promotion of automobile steel under the conditions of superhigh intensity has become one of research hotspot both domestic and external,
In current research work, relatively typical steel grade mainly quenches-matches steel splitting and medium managese steel in third generation automobile steel, but
It is to match in division technique to need enormous investment that dedicated high-strength steel production line is transformed in quenching-；And medium managese steel production technology difficulty is big, because
This individual iron and steel enterprise of above-mentioned current depolarization of technology path is able to produce outside the product of lower intensity rank, not in industrial production
In obtain large-scale production promotion and application.Patent of invention (201310121568.4,201310520580.2,
Etc. 201510498959.7) preparation and heat treatment method of quenching partition (QP) steel have mainly been applied for.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, which is promoted, in these technology paths mainly passes through retained austenite phase change induction plasticity or twinning-induced modeling
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, does not also solve what ingredient design and processes designed from cold rolled annealed technique and the general character method of heat forming technology
Crucial Science and Technology problem.
Summary of the invention
In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is to 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 item
Part proposes through Nb/Ti microalloying, utilizes the quantitative coordination between the distribution of second phase particles size and matrix refinement
Effect makes second phase particles be converted to enhancing plasticising from traditional dispersion-strengtherning, cooperates on this basis with structure refinement and more
Various dimensions enhancing plasticising is realized in phase constitution regulation.
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 ingredient 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
It 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；At the timeliness
300~500 DEG C of temperature of reason；The hot forming heating temperature is 930 DEG C；The interruption hardening heat is 300 DEG C~400 DEG C.
Technical solution of the present invention is mainly designed from Alloying Design, Second Phase Precipitation and structure refinement and heterogeneous structure
Realize various dimensions enhancing plasticising.
According to second phase particles regulation, the needs of structure refinement and heterogeneous structure regulation, to meet service performance as target
Carry out the reverse engineer of alloy system and ingredient, comprehensive main adding elements to harden ability, strengthening effect, carbide is delayed to be formed
And various action characteristics such as inoxidizability, it completes to close from ingredient-tissue-processing conditions-property-cost multifactor
Gold design.Based on above-mentioned cognition, according to characteristic of elements and its to the analyses of the affecting laws of heterogeneous structure regulation as a result, proposing
C-Cr-Mn-Nb alloy system design philosophy, main component system are as follows: phosphorus content be 0.15%-0.30% (weight percent, 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, based on thought that dislocation source is started, realize that second phase particles enhancing plasticising needs specific condition.The present invention
It is put forward for the first time, in order to realize the enhancing plasticising of second phase particles, it is desirable that second phase particles are mainly by TiN and NbC and its is compound
Particle constitute, size should at 10-60 nanometers, under conditions of the effective particle size of matrix is at 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 that the crystallite dimension of austenite should be controlled at 0.5-5 microns or less when finish to gauge.
Heterogeneous structure design proposed by the present invention mainly includes the design of ferritic phase and retained austenite phase.Matrix
For lath martensite.Strain coordination, which is played, according to the ferrite that performance requirement can introduce 0-10% volume fraction improves plasticity
Effect, the retained austenite for needing to introduce 5-30% volume fraction play 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, according to the requirement that strong plasticity adjusts, heating temperature 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, interrupting 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.
Technical principle of the invention:
The present invention proposes using high strength and ductility superhigh intensity automobile steel as target and utilizes second phase particles (zero dimension) and position
Reciprocation-group of the reciprocation-between second phase particles enhancing plasticising, crystal boundary (two dimension) and dislocation between wrong (one-dimensional)
Knit strain coordination and induced plasticity-heterogeneous structure design enhancing plasticising phase of refinement enhancing plasticising and heterogeneous structure (three-dimensional)
In conjunction with realization various dimensions enhance plasticising.From technical principle, steel material has been transferred in various dimensions enhancing plasticising can be able to achieve 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 proliferation is a kind of innovative technique thought and research achievement.
Compared with prior art, the present invention has following technical effect that
1, the mechanism for taking full advantage of various enhancing plasticising in steel material, reduces the conjunction of high level required for single mechanism
Aurification design or/and high production equipment investment are a kind of low costs, low energy consumption, are easily achieved, and suitable large-scale industrial production pushes away
The new method of wide and application third generation automobile steel research and development.
2, establish it is a kind of using second phase particles and meanwhile realize enhancing plasticising new technical method.
3, the various dimensions enhancing plasticising proposed through the invention can make the intensity of automobile steel reach 1200~1500MPa
Superhigh intensity it is horizontal, strength and ductility product reaches 20GPa% or more.
Specific 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
30,120 and 360 millimeters.The steel plate of 4 mm of thickness is hot-rolled down to by 900 DEG C.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 is quenched in 350 DEG C of interruptions, and microstructure is lath
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.The steel plate of 4 mm of thickness is hot-rolled down to by 900 DEG C.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.The steel plate of 4 mm of thickness is hot-rolled down to by 850 DEG C.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)
1. a kind of method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel, which is characterized in that
This method is realized by zerolling, cold rolled annealed and ageing treatment；
The ingredient 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, and the crystallite dimension of austenite should be controlled at 0.5-5 microns or less when finish to gauge；
The cold rolled annealed temperature is 700~1000 DEG C；
300~500 DEG C of the aging temperature；
The matrix of the third generation automobile steel is lath martensite, wherein introduces the ferrite of 0-10% volume fraction
With the retained austenite of 5-30% volume fraction；Second phase particles are made of TiN and NbC and its compound particle, and size is answered
At 10-60 nanometers, under conditions of 3-10 microns, the interparticle distance of second phase particles should be controlled the effective particle size of matrix
System is at 0.3-3 microns.
2. a kind of method of various dimensions enhancing plasticising production high strength and ductility superhigh intensity third generation automobile steel, which is characterized in that
This method is by zerolling, hot forming and interrupts quenching realization；
The ingredient 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, and the crystallite dimension of austenite should be controlled at 0.5-5 microns or less when finish to gauge；
The hot forming heating temperature is 930 DEG C；
The interruption hardening heat is 300 DEG C~400 DEG C；
The matrix of the third generation automobile steel is lath martensite, wherein introduces the ferrite of 0-10% volume fraction
With the retained austenite of 5-30% volume fraction；Second phase particles are made of TiN and NbC and its compound particle, and size is answered
At 10-60 nanometers, under conditions of 3-10 microns, the interparticle distance of second phase particles should be controlled the effective particle size of matrix
System is at 0.3-3 microns.
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| 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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| JP2002317249A (en) * | 2001-04-18 | 2002-10-31 | Nippon Steel Corp | Low yield ratio type high strength steel sheet having excellent ductility and production method therefor |
| JP2003089851A (en) * | 2001-09-14 | 2003-03-28 | Nisshin Steel Co Ltd | High strength duplex stainless steel sheet having high elasticity, and production method therefor |
| JP4408386B2 (en) * | 2004-04-19 | 2010-02-03 | 新日本製鐵株式会社 | High-strength steel with fine grain structure |
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| CN101638749B (en) * | 2009-08-12 | 2011-01-26 | 钢铁研究总院 | Automobile steel with low cost and high strength ductility balance and preparation method thereof |
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| CN103060678B (en) * | 2012-12-25 | 2016-04-27 | 钢铁研究总院 | A kind of warm-working nanometer austenite strengthens plasticising steel and preparation method thereof |
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