CN102703665A - Preparation method of nano-structure strip martensitic ultra-high-strength steel plate - Google Patents
Preparation method of nano-structure strip martensitic ultra-high-strength steel plate Download PDFInfo
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- CN102703665A CN102703665A CN2012101643945A CN201210164394A CN102703665A CN 102703665 A CN102703665 A CN 102703665A CN 2012101643945 A CN2012101643945 A CN 2012101643945A CN 201210164394 A CN201210164394 A CN 201210164394A CN 102703665 A CN102703665 A CN 102703665A
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Abstract
The invention discloses a preparation method of a nano-structure strip martensitic ultra-high-strength steel plate. The steel plate comprises the following chemical components by weight percentage: 0.28 to 0.32 percent of C, 1.5 to 1.8 percent of Si, 1.5 to 1.7 percent of Mn, 1.0 to 1.3 percent of Cr, 0.9 to 1.1 percent of Ni, 0.6 to 0.8 percent of W, less than 0.02 percent of P, less than 0.02 percent of S, and the balance of Fe and inevitable impurities; the method comprises the following steps: smelting alloy steel with the chemical components through a vacuum induction furnace, casting the alloy steel subjected to smelting into steel ingots, slowly cooling the steel ingots to room temperature, heating and performing heat preservation to the steel ingots, performing hot rolling to the steel ingots after the steel ingots are discharged from the furnace, spaying water to cool the steel ingots to a supercooled austenite temperature zone, then rapidly performing one-pass rolling to the steel ingots, rapidly spraying water to cool the steel ingots to room temperature, and performing tempering on the steel ingots, so as to obtain the nano-structure strip martensitic ultra-high-strength steel plate. The method has the advantages that the preparation process is simple, the method is easy to realize on a plate rolling production line, the production efficiency is high, the cost is low, the tensile strength of the plate reaches 1850 to 2050MPa, and the percentage of elongation is 10 to 15 percent.
Description
Technical field
The present invention relates to a kind of preparation method of steel board.
Background technology
As structured material and the main enhancement method of a large amount of steel that use is to quench, obtain martensitic stucture.And martensite has two kinds of forms usually in the steel: a kind of is lath martensite, and its inner substructure is a dislocation; Another kind is a faller gill shape martensite, and its inner substructure is a twin.The lath martensite tissue has HS and H.T., promptly have good comprehensive mechanical properties, and faller gill shape martensite has high firmness, HS, but its toughness is very low.Therefore, for require shock-resistant with bear member than high-load, controlling its microtexture that obtains lath martensite is highly significant.Generally, steel quench obtain martensitic simultaneously can be with a spot of residual austenite.So, the form of the thickness of lath martensite and residual austenite, quantity and distribution characteristics play crucial effect to the mechanical property of steel.The tissue that the lath martensite of dislocation substructure and film residual austenite are alternately arranged has bigger crack propagation drag and reaches plasticity, toughness and component plasticity preferably.Wherein the stability of residual austenite is a key factor that keeps H.T..If the stability of residual austenite is lower, it promptly changes under the load effect, generates hard crisp martensitic stucture, or the high slightly carbide that promptly changes into of environment for use temperature, and this all will make the steel embrittlement, worsen its use properties.In order to solve the instable problem of this residual austenite; G.J. people (patent of invention CN 1325685C) such as Ku Xinsiji has invented a kind of nano combined martensitic steel, and contained alloying element is by weight percentage: C 0.05 ~ 0.33, Cr 0.5 ~ 12, Ni 0.25 ~ 5, Mn 0.26 ~ 6, Si < 1; Its microstructure is alternately distributed by martensite lath and austenite film and forms, and there is the lath bundle of single variant in each austenite crystal inside, and austenitic stability is higher than the austenite in the changeable body lath martensite tissue that the tradition quenching obtains in the tissue; Its preferred method of manufacture mainly comprises the steps: in 1050 ~ 1200 ℃ of rolling or forgings of austenitizing temperature scope; Be cooled to again austenite recrystallization temperature to 900 ~ 950 ℃ of TRs that is higher than 50 ℃ of this temperature most preferably temperature be 900 ~ 925 ℃) rolling or forge; Make austenite generation dynamic recrystallization; Come refine austenite crystal grain; The size that makes austenite crystal is less than 10 microns (being preferably 5 ~ 9 microns), and Cooling Quenching again obtains containing the tissue that single-orientated lath martensite and film austenic are alternately arranged at each austenite crystal.But the alloying constituent of this Patent right requirement does not contain Mo or W, causes temper brittleness easily; Si content lower (< 1 wt.%) is unfavorable for improving ferritic intensity and temper resistance, and suppresses carbide and separate out; Process step requires comparatively accurately to control finishing temperature and guarantees to take place dynamic recrystallization refine austenite crystal grain, thereby obtains grain-size < 10 microns austenite; No temper, plasticity and toughness levels also have the space of improving.
Summary of the invention
[0003] the object of the present invention is to provide the preparation method that a kind of technology is simple, easy to operate, can improve plasticity and flexible nanostructure lath martensite ultrahigh-strength steel sheet material.
Technical scheme of the present invention is following:
1, the chemical ingredients of nanostructure lath martensite ultrahigh-strength steel sheet material of the present invention is by weight percentage: C 0.28 ~ 0.32, and Si 1.5 ~ 1.8, and Mn 1.5 ~ 1.7; Cr 1.0 ~ 1.3, and Ni 0.9 ~ 1.1, and W 0.6 ~ 0.8; < 0.02, < 0.02, surplus is Fe and unavoidable impurities to S to P;
2, melting ingot casting:
With vacuum induction furnace medium carbon alloy steel is carried out melting, vacuum tightness 0.1 ~ 0.6 Pa, 1520 ~ 1560 ℃ of temperature, smelting time 0.5 ~ 1.0 h become steel ingot with the molten steel casting of melting, and slow cooling is to room temperature;
3, rolling:
Above-mentioned ingot casting is heated to 1220 ℃ of insulation 3 ~ 5 h comes out of the stove, 1180 ~ 1200 ℃ of beginning roughing, finishing temperature is 870 ~ 890 ℃, and six passages are rolling, and total reduction is 85%; Roll the back water spray and be cooled fast to 400 ~ 600 ℃, carry out the one-pass roller of 30 ~ 50% draught immediately, the cool to room temperature of spraying water rapidly then obtains sheet material;
4, temper:
Above-mentioned sheet material is heated to 200 ~ 350 ℃, comes out of the stove air cooling to room temperature after insulation 2 ~ 5 h tempering, make nanostructure lath martensite ultrahigh-strength steel sheet material, its microtexture is the lath-shaped tempered martensite of mean thickness 50 ~ 80 nm.
The main effect of each alloying element is following:
C: can significantly improve hardening capacity, be the most effective solution strengthening element in the steel, and increasing of C content can significantly improve martensitic intensity, but too high levels fragility becomes big.So select C content range 0.28 ~ 0.32 wt.% of typical medium carbon steel, to guarantee to obtain excellent comprehensive mechanical properties.
Si: add-on surpasses 1.5% can strengthen martensite; The obstruction carbide is separated out, and improves temper resistance, helps between lath martensite, forming the residual austenite film; And can first kind temper brittleness temperature be brought up to more than 350 ℃; And Si content can cause forgeability to reduce above 2% o'clock, and increased fragility, so the add-on of Si is controlled at 1.5 ~ 1.8%.
Mn: significantly improve hardening capacity, the back remained austenite content is too much but too much Mn causes quenching, so the add-on of Mn is controlled at 1.5 ~ 1.8%.
Cr: improve hardening capacity and temper resistance.
Ni: improve hardening capacity, improve toughness.
W: improve hardening capacity, prevent temper brittleness.
Being cooled fast to the supercooled austenite warm area behind the austenitizing is rolled for 400 ~ 600 ℃; Supercooled austenite generation viscous deformation but recrystallize does not take place; Dislocation desity and intensity enlarge markedly; The supercooled austenite crystal grain that flattens produces deformation texture, be cooled fast to 220 ℃ after air cooling martensitic transformation takes place in the room temperature process.The high density dislocation of supercooled austenite causes the martensite nucleation site significantly to increase, and the HS of supercooled austenite causes the shear resistance of martensitic transformation to increase, so obtained the tissue that nanostructure lath martensite and residual austenite film are alternately arranged at last.In addition, the supercooled austenite crystal grain of flattening and deformation texture thereof have limited the variant of martensitic transformation and have selected, and cause single martensite variants to form at the austenite crystal intragranular.Martensitic stucture reheats 200 ~ 350 ℃ of tempering, eliminates martensitic transformation stress, obtains tempered martensite, can when not reducing intensity, improve plasticity and toughness.
The present invention compared with prior art has following advantage:
1, preparation technology is simple, on the rolled plate production line, realizes easily, and production efficiency is high, cost is low.
The deformed austenite crystal grain that 2, can obtain flattening, and have higher density dislocation and HS, the nanostructure lath martensite residual austenite tissue higher that helps quenching and form single variant with stability.
3, can effectively stop carbide to be separated out; Assurance obtains martensite lath and the residual austenite film tissue of alternately arranging, and improves toughness, reduces hydrogen embrittlement susceptibility; The Low-Temperature Temper Brittleness temperature is pushed into more high-temperature zone; Enlarge the low-temperaturetempering process window, help, satisfy under the different service conditions performance requriements part through the balance between tempering adjustment intensity and plasticity and the toughness.
4, can reduce unsettled residual austenite and make martenaging martempering, remove the unrelieved stress that martensitic transformation causes, guarantee to have high-intensity also have simultaneously higher plasticity and toughness.Tensile strength reaches 1850 ~ 2050 MPa, and unit elongation reaches 10 ~ 15%.
Embodiment
Embodiment 1
At vacuum tightness 0.1 Pa and 1520 ℃ of following melting medium carbon alloy steels of temperature, melting 0.5 h is cast into steel ingot with vacuum induction furnace, and slow cooling is to room temperature; The ingot casting chemical ingredients is C 0.28 by weight percentage, and Si 1.5, and Mn 1.7; Cr 1.3, and Ni 1.1, and W 0.8; P 0.012, and S 0.010, and surplus is Fe and unavoidable impurities.Above-mentioned ingot casting is heated to 1220 ℃, is incubated 5 h and comes out of the stove, 1180 ℃ of beginning roughing, finishing temperature is 890 ℃, and six passages are rolling, total reduction 85%; Spray water immediately after rolling and be cooled to 400 ℃, carry out the one-pass roller of 30% draught rapidly, the cool to room temperature of spraying water rapidly again obtains sheet material; This sheet material is heated to 200 ℃ of insulations comes out of the stove air cooling after the 2 h tempering to room temperature; Prepare nanostructure lath martensite ultrahigh-strength steel sheet material; Microtexture is that lath-shaped tempered martensite and the film residual austenite of 80 nm formed by alternatively distributed mean thickness; Its tensile strength reaches 1850 MPa, and unit elongation reaches 15%.
Embodiment 2
At vacuum tightness 0.3 Pa and 1540 ℃ of following melting medium carbon alloy steels of temperature, be cast into steel ingot behind melting 0.7 h with vacuum induction furnace, slow cooling is to room temperature; The ingot casting chemical ingredients is C 0.30 by weight percentage, and Si 1.6, and Mn 1.6; Cr 1.2, and Ni 1.0, and W 0.7; P 0.015, and S 0.014, and surplus is Fe and unavoidable impurities.Above-mentioned ingot casting is heated to 1220 ℃, is incubated 4 h and comes out of the stove, 1190 ℃ of beginning roughing, finishing temperature is 880 ℃, and six passages are rolling, total reduction 85%; Spray water immediately after rolling and be cooled to 500 ℃, carry out the one-pass roller of 40% draught rapidly, the cool to room temperature of spraying water rapidly again obtains sheet material; This sheet material is heated to 300 ℃ of insulations; Air cooling is to room temperature 3.5 come out of the stove after the h tempering; Prepare nanostructure lath martensite ultrahigh-strength steel sheet material; Microtexture is that lath-shaped tempered martensite and the film residual austenite of 70 nm formed by alternatively distributed mean thickness, and its tensile strength reaches 1920 MPa, and unit elongation reaches 12%.
Embodiment 3
At vacuum tightness 0.6 Pa and 1560 ℃ of following melting medium carbon alloy steels of temperature, be cast into steel ingot behind melting 1.0 h with vacuum induction furnace, slow cooling is to room temperature; The ingot casting chemical ingredients is C 0.32 by weight percentage, and Si 1.7, and Mn 1.5; Cr 1.0, and Ni 0.9, and W 0.6; P 0.013, and S 0.012, and surplus is Fe and unavoidable impurities.Above-mentioned ingot casting is heated to 1220 ℃, is incubated 3 h and comes out of the stove, 1200 ℃ of beginning roughing, finishing temperature is 870 ℃, and six passages are rolling, total reduction 85%; Spray water immediately after rolling and be cooled to 600 ℃, carry out the one-pass roller of 50% draught rapidly, the cool to room temperature of spraying water rapidly again obtains sheet material; This sheet material is heated to 350 ℃; Come out of the stove air cooling to room temperature after being incubated 5 h tempering; Prepare nanostructure lath martensite ultrahigh-strength steel sheet material; Microtexture is that lath-shaped tempered martensite and the film residual austenite of 50 nm formed by alternatively distributed mean thickness, and its tensile strength reaches 2050 MPa, and unit elongation reaches 10%.
Claims (1)
1. the preparation method of a nanostructure lath martensite ultrahigh-strength steel sheet material is characterized in that:
(1) its chemical ingredients be by weight percentage C 0.28 ~ 0.32, Si 1.5 ~ 1.8, Mn 1.5 ~ 1.7, Cr 1.0 ~ 1.3, Ni 0.9 ~ 1.1, W 0.6 ~ 0.8, P 0.02, < 0.02, surplus is Fe and unavoidable impurities to S;
(2) with vacuum induction furnace medium carbon alloy steel is carried out melting, vacuum tightness 0.1 ~ 0.6 Pa, 1520 ~ 1560 ℃ of temperature, smelting time 0.5 ~ 1.0 h become steel ingot with the molten steel casting of melting, and slow cooling is to room temperature;
(3) above-mentioned ingot casting is heated to 1220 ℃ of insulation 3 ~ 5 h and comes out of the stove, 1180 ~ 1200 ℃ of beginning roughing, finishing temperature is 870 ~ 890 ℃, and six passages are rolling, and total reduction is 85%; Roll the back water spray and be cooled fast to 400 ~ 600 ℃, carry out the one-pass roller of 30 ~ 50% draught immediately, the cool to room temperature of spraying water rapidly then obtains sheet material;
(4) above-mentioned sheet material is heated to 200 ~ 350 ℃ of insulations and comes out of the stove air cooling after 2 ~ 5 h tempering to room temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455146A (en) * | 2020-05-06 | 2020-07-28 | 西京学院 | Strengthening and toughening treatment method for low-alloy martensitic steel and martensitic steel |
Citations (3)
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|---|---|---|---|---|
| JPH09111408A (en) * | 1995-10-11 | 1997-04-28 | Toa Steel Co Ltd | Low strain type carburized and quenched steel stock for gear |
| CN1566376A (en) * | 2003-06-24 | 2005-01-19 | 宝山钢铁股份有限公司 | Method for producing low-carbon steel or low-alloy steel plate having submicron crystal grain |
| CN101225499A (en) * | 2008-01-31 | 2008-07-23 | 上海交通大学 | Low-alloy super-strength multiphase steel and heat treatment method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111408A (en) * | 1995-10-11 | 1997-04-28 | Toa Steel Co Ltd | Low strain type carburized and quenched steel stock for gear |
| CN1566376A (en) * | 2003-06-24 | 2005-01-19 | 宝山钢铁股份有限公司 | Method for producing low-carbon steel or low-alloy steel plate having submicron crystal grain |
| CN101225499A (en) * | 2008-01-31 | 2008-07-23 | 上海交通大学 | Low-alloy super-strength multiphase steel and heat treatment method thereof |
Non-Patent Citations (1)
| Title |
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| 谷臣清等: "板条马氏体晶宽纳米化及其力学行为", 《材料热处理学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455146A (en) * | 2020-05-06 | 2020-07-28 | 西京学院 | Strengthening and toughening treatment method for low-alloy martensitic steel and martensitic steel |
| CN111455146B (en) * | 2020-05-06 | 2023-02-28 | 西京学院 | Strengthening and toughening treatment method for low-alloy martensitic steel and martensitic steel |
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