CN107419179B - High-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate and preparation method thereof - Google Patents

High-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate and preparation method thereof Download PDF

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CN107419179B
CN107419179B CN201710673875.1A CN201710673875A CN107419179B CN 107419179 B CN107419179 B CN 107419179B CN 201710673875 A CN201710673875 A CN 201710673875A CN 107419179 B CN107419179 B CN 107419179B
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strength
steel plate
toughness
microalloyed
rolled steel
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CN107419179A (en
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宋仁伯
周乃鹏
李轩
李佳佳
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

Abstract

A high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate and a preparation method thereof belong to the technical field of new-generation automobile steel plates. The key point of the invention is to obtain a residual austenite phase with a certain volume fraction through reasonable chemical components and process design, realize the control of grain size and the distribution of alloy elements. The components by mass percent are respectively as follows: c: 0.15 to 0.2%, Mn: 7.6-8%, Al: 5.4-6%, Si: 0.01 to 0.02%, Nb: 0.02 to 0.04%, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of preparing steel billets according to the component proportion, heating and preserving heat, carrying out hot rolling to obtain a hot-rolled steel plate, carrying out air cooling on the hot-rolled steel plate to room temperature, and carrying out heat treatment after rolling to obtain the steel plate with the density of 6.85-6.99 g/cm3The high-strength and high-toughness microalloyed Al-containing medium manganese hot-rolled steel plate has the tensile strength of 940-1250 MPa, the elongation of 20-40 percent and the product of strength and elongation of more than 30GPa percent.

Description

High-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate and preparation method thereof
Technical Field
The invention belongs to the technical field of a new-generation light high-strength steel plate for automobiles, and particularly relates to a high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate component design and a preparation method thereof.
Background
The development of energy conservation, environmental protection and light weight has become a necessary trend for the development of the automobile industry to cope with increasingly nervous resource shortage and environmental pollution. Currently, high strength DP steel and TRIP steel are used in a large number of applications in automobiles, but tensile strength and formability thereof are to be further improved. The Q & P steel also gradually realizes the industrial application by utilizing the martensite structure strengthening and the metastable retained austenite plasticizing mechanism, but the comprehensive performance of the Q & P steel cannot completely meet the requirement of the development of light weight of automobiles. Therefore, it is very urgent to search the component design and preparation method of the new generation of high strength and toughness steel for automobiles in order to obtain light weight and high strength and toughness steel for automobiles with higher strength, high formability and high cost performance.
The medium manganese Fe-Mn-Al-C steel is used as novel light steel with high specific strength (strength-density ratio), has excellent strength and plasticity matching and has very wide application prospect. In recent years, a large amount of new species development and research work has been carried out by domestic researchers on medium-manganese Fe-Mn-Al-C automotive steels.
The patent with the patent application number of 201310507894.9 discloses that a steel plate with the tensile strength of 980MPa and the elongation of more than 22 percent can be obtained from medium manganese steel with the component system of 0.1-0.4 percent of C +3-8 percent of Mn through hot continuous rolling, cold rolling and continuous annealing; patent publication C of patent application No. 201610927995.5: 0.1-0.3%, Si: 0.3-3.5%, Mn: 3.0-15.0%, Al: 1.0-3.5 percent of medium manganese steel with a component system of V, Ti and Nb which are respectively less than or equal to 0.2 percent can be subjected to hot rolling, quenching, tempering, cold rolling and annealing to obtain a steel plate with the yield strength of 590-970 MPa, the tensile strength of 980-1440 MPa, the total elongation of 30-42 percent and the product of strength and elongation of more than 40GPa percent; the patent with the patent application number of 201610592858.0 discloses that an automobile steel plate with the tensile strength of 1100-1600 MPa, the elongation of 35-65% and the product of strength and elongation of 35-65 GPa% is obtained by carrying out hot rolling, warm rolling, cover annealing or cold rolling and continuous annealing on medium manganese steel with the contents of 0.3-0.5% of C, 8-12% of Mn, 1.8-3.5% of Al and 0.25-0.7% of V.
In summary, although the medium manganese steel can obtain good strength and plasticity by adjusting chemical components and controlling rolling and heat treatment processes, the medium manganese steel has high components due to high alloy content and addition of Nb, V, Ti and other elements, and generally needs a complex preparation process. On the basis of a common medium manganese steel component system, 0.02-0.04% of Nb element is added for microalloying, and meanwhile, the preparation process is simplified into one-step solution treatment, so that the light high-strength and high-toughness automobile steel with the tensile strength of 940-1250 MPa, the elongation of 20-40% and the product of strength and elongation of more than 30 GPa% is obtained. Not only meets the requirement of industrial performance, but also reduces the production cost and the process requirement, and has important economic significance and social benefit.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate. On the basis of further optimizing and narrowing the contents of carbon and manganese in the medium manganese steel, a microalloy strengthening element Nb is added, so that stable retained austenite with higher volume fraction is obtained in the steel, the element distribution in the austenite is adjusted, the contents of C and Mn in the austenite are reduced, and the retained austenite has enough stability to ensure that the austenite phase can generate TRIP (transformation induced plasticity) or TWIP (twinning induced plasticity) effect in the deformation process of the steel plate, so that the light high-strength high-toughness automobile steel plate with high strength and excellent plasticity is finally obtained.
In order to realize the purpose, the invention designs light high-strength and high-toughness microalloyed Fe-Mn-Al-C steel which comprises the following chemical components: c: 0.15 to 0.2%, Mn: 7.6-8.0%, Al: 5.4-6.0%, Si: 0.01 to 0.02%, Nb: 0.02 to 0.04%, and the balance of Fe and inevitable impurities. The density of the steel for experiment is 6.85-6.99 g/cm3The reduction is 11.1-12.8% compared with pure iron.
The medium manganese Fe-Mn-Al series low-density steel has lower Mn content due to higher A1 content, and the room temperature structure generally takes ferrite as a matrix; the volume fraction and the grain size of austenite are adjusted by accurately controlling the contents of Mn, Al and C elements in steel; the microalloy element Nb can stabilize ferrite and effectively pin grain boundaries, and meanwhile, the solute Nb can delay the phase transformation from austenite to ferrite.
The preparation method of the high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate comprises the following steps:
(1) smelting according to the chemical components, obtaining molten steel of the chemical components through smelting in a converter, an electric furnace or an induction furnace, producing ingots by die casting, and forging the ingots into slabs;
(2) heating the billet to 1200 ℃, and preserving heat for 2h, which is beneficial to the diffusion of alloy elements and provides uniform original structure for subsequent rolling;
(3) carrying out hot rolling on the prepared plate blank, wherein the starting rolling temperature is 1100-1150 ℃, the finishing rolling temperature is 850-900 ℃, carrying out 6-pass hot rolling to obtain a sheet with the thickness of 3mm, rolling, coiling and air cooling to room temperature;
(4) and rapidly heating the hot-rolled steel plate to 700-1000 ℃ for solution treatment, preserving heat for 0.5-1 h, and then performing water quenching to room temperature.
The invention provides high-toughness microalloyed Al-containing medium manganese hot rolled steel, which is characterized in that through optimized alloy components and solution process design, the content of residual austenite in a hot rolled steel structure is greatly improved, and the mechanical stability of the residual austenite is accurately adjusted. The addition of trace Nb element has the functions of improving the volume fraction of austenite, refining austenite grains and adjusting the distribution of elements such as C, Mn and the like in the austenite. The tensile strength of the steel plate is improved, and meanwhile, the steel plate has matched plasticity. The tensile strength is 940-1250 MPa, the elongation is 20-40%, and the product of strength and elongation is more than 30 GPa%. Compared with the cold-rolled annealed steel widely applied at present, the preparation process flow of hot rolling and solution treatment adopted by the invention is greatly simplified, the industrial applicability is improved, the production cost is reduced, and the development requirements of light weight in the current stage and the future stage of the automobile steel are met.
Drawings
FIG. 1 is an XRD image of the residual austenite content of light-weight high-strength and high-toughness microalloyed Fe-Mn-Al-C steel prepared in examples 1, 2, 4 and 6 of the invention;
FIG. 2 is an SEM morphology image of light high-toughness microalloyed Fe-Mn-Al-C steel prepared in examples 1, 2, 4 and 6 of the invention: wherein:
(a) is an SEM morphology image of the high-toughness microalloyed Al-containing medium-manganese hot rolled steel of the example 1;
(b) is an SEM morphology image of the high-toughness microalloyed Al-containing medium manganese hot rolled steel in the embodiment 2;
(c) is an SEM morphology image of the high-toughness microalloyed Al-containing medium manganese hot rolled steel of the example 4;
(d) is an SEM morphology image of the high-toughness microalloyed Al-containing medium manganese hot rolled steel of the example 6;
FIG. 3 is a graph of stress-strain curves of high toughness microalloyed hot rolled steel containing Al and Mn prepared in examples 1, 2, 3, 4, 5 and 6 of the present invention;
FIG. 4 is an SEM morphology image of Nb-containing precipitates of the high-toughness microalloyed Al-medium manganese hot rolled steel prepared in example 1 of the invention;
FIG. 5 is TEM morphology image and diffraction spots of Nb-containing precipitates of the high-toughness microalloyed Al-containing medium manganese hot rolled steel prepared in example 1 of the invention
FIG. 6 is an EDS spectrum of Nb-containing precipitates in the high strength and toughness microalloyed hot rolled steel containing Al and Mn prepared in example 1 of the invention
FIG. 7 is a distribution EPMA topography of high toughness microalloyed hot rolled steel C, Mn containing Al and medium manganese prepared in example 4 of the invention,
wherein:
(a) an SEM topography of a selected area of the high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared in the example 4;
(b) a distribution diagram of the element C in a selected area of the high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared in the example 4;
(c) a Mn element distribution diagram of a selected area of the high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared in the embodiment 4;
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The steel comprises the following chemical components in percentage by mass: c: 0.15%, Mn: 7.87%, Al: 5.91%, Nb: 0.03%, Si: 0.02% and the balance Fe and unavoidable impurities. And smelting the steel ingot by adopting a vacuum induction furnace, heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging the steel ingot into a steel billet.
Heating the billet to 1200 ℃, preserving heat for 2h, hot rolling into a sheet with the thickness of 3mm by 6 times, and then air cooling to room temperature, wherein the final rolling temperature is 850-900 ℃.
And heating the hot-rolled steel plate to 700 ℃ in a heating furnace, preserving the heat at l h, and performing water quenching to room temperature.
The high-strength and high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared by the example is subjected to related performance tests, and XRD (X-ray diffraction) characterization results are shown in figure 1; the SEM topography is shown in FIG. 2 (a); processing the steel plate after heat treatment into a tensile sample according to GB/T228-2002 'method for testing the tensile strength of the metal material at room temperature', wherein the stress-strain curve is shown in figure 3; SEM high power images, TEM transmission images and diffraction spot picking and EDS energy spectrum results of the Nb-containing precipitates are shown in FIGS. 4, 5 and 6, respectively.
Example 2
The steel comprises the following chemical components in percentage by mass: c: 0.18%, Mn: 7.58%, Al: 5.98%, Nb: 0.02%, Si: 0.02% and the balance Fe and unavoidable impurities. And smelting the steel ingot by adopting a vacuum induction furnace, heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging the steel ingot into a steel billet.
Heating the billet to 1200 ℃, preserving heat for 2h, hot rolling into a sheet with the thickness of 3mm by 6 times, and then air cooling to room temperature, wherein the final rolling temperature is 850-900 ℃.
And (3) heating the hot-rolled steel plate to 800 ℃ in a heating furnace, preserving heat for lh, and performing water quenching to room temperature.
The high-strength and high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared by the example is subjected to related performance tests, and XRD (X-ray diffraction) characterization results are shown in figure 1; the SEM topography is shown in FIG. 2 (b); the stress strain curve is shown in fig. 3.
Example 3
The steel comprises the following chemical components in percentage by mass: c: 0.15%, Mn: 7.87%, Al: 5.91%, Nb: 0.01%, Si: 0.01 percent, and the balance of Fe and inevitable impurities. And smelting the steel ingot by adopting a vacuum induction furnace, heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging the steel ingot into a steel billet.
Heating the billet to 1200 ℃, preserving heat for 2h, hot rolling into a sheet with the thickness of 3mm by 6 times, and then air cooling to room temperature, wherein the final rolling temperature is 850-900 ℃.
And (3) heating the hot-rolled steel plate to 850 ℃ in a heating furnace, preserving the heat at l h, and performing water quenching to room temperature.
The high-strength and high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared by the example is subjected to related performance tests, and the stress-strain curve is shown in figure 3.
Example 4
The steel comprises the following chemical components in percentage by mass: c: 0.21%, Mn: 7.78%, Al: 5.90%, Nb: 0.04%, Si: 0.01 percent, and the balance of Fe and inevitable impurities. And smelting the steel ingot by adopting a vacuum induction furnace, heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging the steel ingot into a steel billet.
Heating the billet to 1200 ℃, preserving heat for 2h, hot rolling into a sheet with the thickness of 3mm by 6 times, and then air cooling to room temperature, wherein the final rolling temperature is 850-900 ℃.
And heating the hot-rolled steel plate to 900 ℃ in a heating furnace, preserving the heat at l h, and performing water quenching to room temperature.
The high-strength and high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared by the example is subjected to related performance tests, and XRD (X-ray diffraction) characterization results are shown in figure 1; the SEM topography is shown in FIG. 2 (c); the stress-strain curve is shown in fig. 3; the SEM topography of the selected area is shown in FIG. 7(a), the C element distribution of the selected area is shown in FIG. 7(b), and the Mn element distribution of the selected area is shown in FIG. 7(C) by EPMA measurement.
Example 5
The steel comprises the following chemical components in percentage by mass: c: 0.18%, Mn: 7.82%, Al: 5.56%, Nb: 0.02%, Si: 0.02% and the balance Fe and unavoidable impurities. And smelting the steel ingot by adopting a vacuum induction furnace, heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging the steel ingot into a steel billet.
Heating the billet to 1200 ℃, preserving heat for 2h, hot rolling into a sheet with the thickness of 3mm by 6 times, and then air cooling to room temperature, wherein the final rolling temperature is 850-900 ℃.
And (3) heating the hot-rolled steel plate to 950 ℃ in a heating furnace, preserving the heat at l h, and performing water quenching to room temperature.
The high-strength and high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared by the example is subjected to related performance tests, and the stress-strain curve is shown in figure 3.
Example 6
The steel comprises the following chemical components in percentage by mass: c: 0.20%, Mn: 7.84%, Al: 5.69%, Nb: 0.02%, Si: 0.02% and the balance Fe and unavoidable impurities. And smelting the steel ingot by adopting a vacuum induction furnace, heating the steel ingot to 1200 ℃, preserving heat for 2 hours, and forging the steel ingot into a steel billet.
Heating the billet to 1200 ℃, preserving heat for 2h, hot rolling into a sheet with the thickness of 3mm by 6 times, and then air cooling to room temperature, wherein the final rolling temperature is 850-900 ℃.
And (3) heating the hot-rolled steel plate to 1000 ℃ in a heating furnace, preserving heat for lh, and performing water quenching to room temperature.
The high-strength and high-toughness microalloyed Al-containing medium-manganese hot rolled steel prepared by the example is subjected to related performance tests, and XRD (X-ray diffraction) characterization results are shown in figure 1; the SEM topography is shown in FIG. 2 (d); the stress strain curve is shown in fig. 3.

Claims (5)

1. A high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate is characterized by comprising the following chemical components in percentage by weight: c: 0.15 to 0.20%, Mn: 7.6-8.0%, Al: 5.4-6.0%, Si: 0.01 to 0.02%, Nb: 0.02 to 0.04 percent, and the balance of Fe and inevitable impurities;
the high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate is prepared by sequentially carrying out smelting, forging, hot rolling, solution treatment and water quenching to room temperature;
the high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate has a fine grain, ferrite and austenite dual-phase structure.
2. The preparation method of the high strength and toughness microalloyed Al-containing medium manganese hot rolled steel plate as claimed in claim 1, which comprises the steps of smelting, forging, hot rolling and solution treatment, and is characterized by comprising the following specific steps of:
(1) smelting the chemical composition of claim 1 and forging the cast billet into a slab;
(2) carrying out hot rolling on the plate blank prepared in the step (1), wherein the process comprises the steps of heating a steel billet to 1200 ℃, preserving heat for 2 hours, carrying out 6-pass hot rolling to obtain a sheet with the thickness of 3mm, rolling, coiling and air cooling to room temperature;
(3) and (3) carrying out hot treatment after rolling on the hot rolled plate, adopting a solid solution treatment process, rapidly heating the steel plate to 700-1000 ℃, preserving heat for 0.5-1 h, and then carrying out water quenching to room temperature.
3. The preparation method of the high strength and toughness microalloyed Al-containing medium manganese hot rolled steel plate as claimed in claim 2, wherein the hot rolling start temperature in the step (2) is 1050-1150 ℃, and the finish rolling temperature is 850-900 ℃.
4. The method for preparing the high strength and toughness microalloyed Al-containing medium manganese hot rolled steel plate according to claim 2, wherein the quenching temperature of the hot rolled plate in the step (3) is 900 ℃, and the holding time is 1 h.
5. The high toughness steel wire as claimed in claim 1The alloyed Al-containing medium manganese hot rolled steel plate is characterized in that the steel plate after heat treatment has a two-phase structure mainly comprising delta-ferrite and austenite, the volume fraction of the austenite is higher than 34%, the grain size of the austenite is 5-16 mu m, the Mn content in the austenite is 8.65-9.47%, and the C content is 0.92-1.01%; the density of the high-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate is 6.85-6.99 g/cm3The tensile strength is 940-1250 MPa, the elongation is 20-40%, and the product of strength and elongation is more than 30 GPa%.
CN201710673875.1A 2017-08-09 2017-08-09 High-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate and preparation method thereof Active CN107419179B (en)

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