CN102304664A - High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof - Google Patents

High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof Download PDF

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Publication number
CN102304664A
CN102304664A CN201110270279A CN201110270279A CN102304664A CN 102304664 A CN102304664 A CN 102304664A CN 201110270279 A CN201110270279 A CN 201110270279A CN 201110270279 A CN201110270279 A CN 201110270279A CN 102304664 A CN102304664 A CN 102304664A
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cold
strength
rolled steel
plasticity
steel plate
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赵爱民
李振
唐荻
米振莉
尹鸿翔
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Beijing University of Technology
University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The invention belongs to the processing field of the metal material and relates to a high strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and a preparation method thereof. The medium manganese TRIP cold-rolled steel plate comprises the following components in percent by mass: 0.05%-0.4% of C, 0.5% or less of Si, 5%-10% of Mn, 1%-8% of Al, 0.1% or less of P, 0.02% or less of S, 0.01%-0.10% of Nb, and the balance of iron or inevitable impurities. The preparation method of the medium manganese TRIP cold-rolled steel plate comprises the following steps: performing smelting, die casting or continuous casting, hot rolling, cold rolling and heat treatment; keeping the temperature of the cold-rolled steel plate above Ac1 for 2-20 min; and cooling to the room temperature. Through control on the components and technology, different proportions of strength to plasticity of the prepared material can be obtained, the tensile strength can reach 900-1,210 MPa and the elongation rate can reach 17-30%. The preparation method is simple and has low cost and good application prospect.

Description

A kind of high-strength high-plasticity contains manganese TRIP cold-rolled steel sheet and preparation method in the aluminium
Technical field
The invention belongs to the metal material processing field, relate to a kind of HS, high-ductility contains manganese TRIP cold-rolled steel sheet and preparation method in the aluminium.
Background technology
Be demand immediately following the automotive industry loss of weight; Steel industry need produce that intensity is higher, the better ferrous materials of plasticity. can reach the purpose of vehicle energy saving loss of weight in order to prove high tensile steel plate; 35 tame iron and steel enterprises of 18 countries implemented a ultra light steel automotive body (Ultra-Light Steel Auto Body is called for short ULSAB) plan in the tissue whole world in 1994 in world steel association.At this in the works, 90% body structure adopts high tensile steel plate, uses technology such as laser assembly solder plate and hydroforming, makes body of a motor car loss of weight 36%.After accomplishing the ULSAB plan, implemented one again and be referred to as ULSAB-AVC (Advance vehicle concept) plan, i.e. advanced concept car ultra light steel automotive body plan in 1998.At this in the works, 100% body structure uses high tensile steel plate, uses new AHSS plate more than 80%.The use of AHSS plate makes the economy of fuel oil be able to increase exponentially.The final fuel oil consumption of ULSAB-AVC reaches 3.2~4.5L/100km.
Through numerous in the world iron and steel scholars' research for many years, advanced high-strength steel of the first-generation and the advanced high-strength steel of the s-generation have successfully been developed.Wherein the advanced high-strength steel of the first-generation comprises DP steel, TRIP steel, CP steel, MART steel etc.; The advanced high-strength steel of the s-generation comprises TWIP steel, L-IP steel etc.In recent years, increasing people begins to pay close attention to exploitation third generation high-strength steel.The advanced high-strength steel of the third generation has better intensity and plasticity than the advanced high-strength steel of the first-generation, has substantial degradation than the advanced high-strength steel cost of the s-generation again simultaneously.The strength and ductility product target of the advanced high-strength steel of the third generation is about 24GPa*%~40GPa*% between the first-generation and the advanced high-strength steel of the s-generation.
Scholar (document 1:David K.Matlock is arranged; John G.Speer; Third Generation of AHSS:Microstructure Design Concepts.Microstructure and Texture in Steels and Other Materials; (2009) 185-205) discover, can realize the design and the production of the advanced high-strength steel of the third generation through the raising of Q&P technology or manganese content.
Summary of the invention
The objective of the invention is to use the cold rolling and continuous annealing heat-treating methods of traditional industry, produce the manganese TRIP steel in the aluminium that contains of a kind of HS, high-ductility.
Manganese TRIP steel plate in a kind of HS, the high-ductility, manganese TRIP steel plate composition quality percentage composition is in it is characterized in that: C:0.05~0.4%, Si :≤0.5%; Mn:5%~10%, Al:1%~8%, P :≤0.1%; S :≤0.02%, Nb:0.01%~0.10%, surplus is an iron.
A kind of as stated HS, high-ductility contain manganese TRIP cold-rolled steel sheet in the aluminium, it is characterized in that preparation process is following:
1. smelt, pour into a mould: adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection is cast into slab; Or through smelt, the cast continuous casting becomes strand.
2. hot rolling steel billet: hot rolling finishing temperature is Ar1+50 ℃ and obtains hot rolling blank, and 1200 ℃ of wherein hot rolling Heating temperatures were incubated after 1 hour, hot rolling on 350 2 roller hot rollss, and obtaining thickness is the latten about 3.5~5mm, total deformation is 80~90%.
3. batch: hot rolling blank is cooled under 530~650 ℃ the coiling temperature and batches blank.
4. pickling and cold-rolling: after coil of strip carried out cleanup acid treatment, be rolled at cold rolling tandem rolling unit, obtain cold-rolled steel sheet, cold rolling draft is greater than 60%.
5. thermal treatment process: the cold-reduced sheet that 1~3mm is thick behind insulation 2~20min, is cooled to room temperature subsequently more than Ac1.This ferrous materials obtains the intensity and the plasticity proportioning of different stage through technology and Composition Control, can obtain the tensile strength of 900~1210MPa and 17~30% unit elongation.
C: carbon is austenite stabilizer element, makes the Ms temperature of residual austenite be lower than 15 ℃~25 ℃ of room temperatures and obtain best mechanical property.When carbon content was high in the general residual austenite, stability of retained austenite was high, otherwise residual austenite was stable low when carbon content was low.When carbon content is little 0.05% the time, almost can't guarantee 5% more residual austenite.On the other hand, surpass 0.4% and can make the non-constant of weldableness, so carbon content can not be too high.General carbon content is between 0.05~0.4%.
Mn:. manganese plays austenitic stable element, and austenitic transformation temperature is reduced.Improve the carbon content of residual austenite through increasing the solubleness of carbon in austenite, manganese have the formation that is beneficial to residual austenite, pearlitic formation is postponed, but has enlarged the rate of cooling of practical application, for the industriallization actual production is laid a good foundation.In addition, manganese can also improve the intensity aggregate level of steel through solution strengthening.
Nb: niobium can influence the movability of crystal boundary, and is also influential to the formation of transformation behavior and carbide.Niobium has the effect of significant crystal grain thinning; The adding of the niobium of trace all has significant effect to the enrichment and the martensite forming core of carbon in grain refining, transformation behavior, the austenite; And technology controlling and process is become be easier to, and can under the situation of the not obvious decline of toughness, further increase the intensity of steel.Niobium can make the content of carbon in residual austenite raise, and hinders the formation of bainite, impels the martensite forming core, and the content of acicular ferrite is increased, and improves the residual austenite content in the tissue.
Al: aluminium equally can influence phase transformation power with silicon, but has the advantage that does not influence surface quality.Aluminium is very strong ferritic stabilizer, can be when improving austenitic volume content crystal grain thinning, the residual austenite content and the concentration class of carbon in residual austenite that contain aluminium TRIP steel plate are all than not aluminiferous height.But aluminium has improved transformation temperature, makes two-phase region annealed range extension, has hindered the complete austenitizing when anneal in the two-phase region, and martensitic transition temperature is raise.
Material heterogeneous microstructure of the present invention, the characteristics after the hot rolling are the martensite that can obtain more than 50%, and part can reach 90%, even 100% martensitic stucture, and material has very high intensity.After the above heat-treated annealing of Ac1, can obtain, ferritic, martensite and a large amount of austenitic three-phase contexture make it have good intensity and toughness simultaneously.
The present invention has following advantage:
1. has good performance.The middle manganese TRIP steel that the present invention utilizes traditional rolling and thermal treatment process to prepare to have HS and high-ductility, its strength and ductility product reaches as high as about 30GPa*%, has reached the requirement of the advanced high-strength steel of the third generation.
2. the preparation method is simple.The present invention utilizes traditional steel-making, die casting, continuous casting technology, rolling technology and thermal treatment process, only needs control isothermal temperature and time to obtain, and most iron and steel enterprises just can produce on the existing equipment basis, need not the input of new installation.
3. application prospect is good.The automobile industry that the middle manganese TRIP steel of HS for preparing and high-ductility can be high speed development provides the good technical support.
4. cost is low.Ferrous materials of the present invention has only added a small amount of Mn and Al element, need not add valuable metallic element and can obtain this ferrous materials.
Description of drawings
Fig. 1 is the annealing process synoptic diagram.Wherein X-coordinate is the time, and unit is hour; Ordinate zou is a temperature, and unit is degree centigrade.
Embodiment
Embodiment 1
1. utilize traditional vacuum smelting and hot rolling technology to prepare steel plate
Smelting technology: adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection.Its composition does
C:0.098%, Si:0.18%, Mn:6.77%, Al:3.22%, Nb:0.035%, P:0.009%, S:0.014%, surplus is Fe or unavoidable impurities.
Rolling technology: 1200 ℃ of hot rolling Heating temperatures are incubated after 1 hour hot rolling on 350 2 roller hot rollss; Obtaining thickness is the latten about 3.5~5mm, and total deformation is 80~90%, and its open rolling and finishing temperature are respectively 1100 ℃ and 900 ℃; Pickling is carried out cold rollingly on cold-rolling mill, and cold rolling draft is greater than 70%; Obtain cold-reduced sheet, heat-treat then.
2. thermal treatment process: the cold-rolled steel sheet that 1.5mm is thick 630 ℃ of design temperatures, is incubated after 3 minutes in process furnace, is cooled to room temperature subsequently.Fig. 1 is the annealing process synoptic diagram.
It is ferritic, martensite and residual austenite that its room temperature texture is observed by optical microstructure.The ferrous materials performance that obtains is: tensile strength 1040MPa, unit elongation are 31%, and strength and ductility product is 32240MPa*%.
Embodiment 2
Be that with embodiment 1 difference thermal treatment temp is 650 ℃.The ferrous materials performance that obtains is: tensile strength 993MPa, unit elongation are 27.4%, and strength and ductility product is 27208.2MPa*%.
Embodiment 3
Be that with embodiment 1 difference thermal treatment temp is 720 ℃.The ferrous materials performance that obtains is: tensile strength 971MPa, unit elongation are 28.8%, and strength and ductility product is 27964.8MPa*%.
Embodiment 4
Be that with embodiment 1 difference the ferrous materials composition is:
C:0.12%, Si:0.15%, Mn:5.76%, Al:4.22%; Nb:0.038%, P:0.010%, S:0.012%, surplus is Fe or unavoidable impurities; The performance that obtains ferrous materials is: tensile strength 955MPa, unit elongation are 30.8%, and strength and ductility product is 29414MPa*%.

Claims (2)

1. a high-strength high-plasticity contains manganese TRIP cold-rolled steel sheet in the aluminium, and manganese TRIP cold-rolled steel sheet composition quality percentage composition is in it is characterized in that: C:0.05%~0.4%, Si :≤0.5%; Mn:5~10%; Al:1%~8%, Nb:0.01~0.10%, P :≤0.1%; S :≤0.02%, surplus is an iron.
2. a kind of according to claim 1 high-strength high-plasticity contains the preparation method of manganese TRIP cold-rolled steel sheet in the aluminium, it is characterized in that preparation process is following:
1). smelt, pour into a mould: adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection is cast into slab;
2). smelt, pour into a mould: smelt, pour into a mould continuous casting and become strand;
3). hot rolling and cold-rolling process: hot rolling finishing temperature is Ar1+50 ℃, obtains hot rolling blank; Pickling is also carried out cold rollingly, obtains cold rolling blank;
4). thermal treatment process: more than the cold rolling blank holding temperature Ac1, behind insulation 2~20min, cool to room temperature with the furnace.
CN201110270279A 2011-09-13 2011-09-13 High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof Pending CN102304664A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102828109A (en) * 2012-09-17 2012-12-19 辽宁科技大学 Metastable-state phase-change plastification ultra-fine grain high-intensity plastic product steel and production method thereof
CN102925790A (en) * 2012-10-31 2013-02-13 钢铁研究总院 Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology
CN103667939A (en) * 2013-11-07 2014-03-26 安徽省智汇电气技术有限公司 Manganese steel material for ball bearings and preparation method thereof
CN103667883A (en) * 2013-12-26 2014-03-26 北京科技大学 Low-density and high-toughness automobile-used steel board and preparation process
CN103789704A (en) * 2014-01-25 2014-05-14 安徽省临泉县智创精机有限公司 High-toughness alloy steel material and preparation method thereof
CN104498821A (en) * 2014-12-05 2015-04-08 武汉钢铁(集团)公司 Medium-manganese high-strength steel for automobiles and production method thereof
WO2015077932A1 (en) * 2013-11-27 2015-06-04 何丽丽 Manganese steel and production method thereof
CN104694816A (en) * 2015-03-13 2015-06-10 北京科技大学 Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa%
CN104988391A (en) * 2015-07-07 2015-10-21 河北钢铁股份有限公司 1200-MPa-level cold milling steel and manufacturing method thereof
CN105132810A (en) * 2015-09-03 2015-12-09 慈溪市龙山汽配有限公司 Motor housing alloy and processing process thereof
CN106011637A (en) * 2015-03-25 2016-10-12 纳米及先进材料研发院有限公司 Transformation induced plasticity steel and manufacturing method thereof
CN106191390A (en) * 2016-08-31 2016-12-07 内蒙古科技大学 Manganese TRIP steel and preparation method thereof in one
CN106480366A (en) * 2015-08-31 2017-03-08 鞍钢股份有限公司 A kind of high equiaxial crystal ratio potassium steel steel ingot and its smelting process
CN107475618A (en) * 2017-07-11 2017-12-15 西南交通大学 A kind of high tough low-carbon contains manganese deformation induced plasticity steel and preparation method in aluminium
CN107858586A (en) * 2017-11-07 2018-03-30 东北大学 A kind of preparation method of high strength and ductility without yield point elongation cold rolling medium managese steel plate
CN108866435A (en) * 2018-07-03 2018-11-23 鞍钢股份有限公司 A kind of automobile combined microalloying medium managese steel and its manufacturing method
CN109517947A (en) * 2018-12-12 2019-03-26 贵阳市白云区科创生产力促进中心 A kind of preparation method containing manganese TRIP steel in aluminium
CN109536686A (en) * 2018-12-12 2019-03-29 贵阳市白云区科创生产力促进中心 The preparation method of manganese TRIP steel in a kind of Nb-microalloying
CN109666862A (en) * 2018-12-13 2019-04-23 北京科技大学 A kind of height tough hot rolling medium managese steel and preparation method of the strength and ductility product greater than 60GPa%
CN111334701A (en) * 2020-03-25 2020-06-26 武汉钢铁有限公司 High-elongation hot-rolled tissue regulating steel with tensile strength of more than or equal to 800MPa and production method thereof

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CN102925790B (en) * 2012-10-31 2014-03-26 钢铁研究总院 Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology
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CN103667883B (en) * 2013-12-26 2017-01-11 北京科技大学 Low-density and high-toughness automobile-used steel board and preparation process
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