CN115181913B - Preparation method of low-manganese-content medium-manganese steel - Google Patents
Preparation method of low-manganese-content medium-manganese steel Download PDFInfo
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- CN115181913B CN115181913B CN202210831219.0A CN202210831219A CN115181913B CN 115181913 B CN115181913 B CN 115181913B CN 202210831219 A CN202210831219 A CN 202210831219A CN 115181913 B CN115181913 B CN 115181913B
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D8/0263—Modifying 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a preparation method of low-manganese-content medium manganese steel, which comprises the following steps: smelting: smelting alloy ingredients of low-manganese-content medium-manganese steel, and casting into ingots; homogenizing and forging: homogenizing the cast ingot and forging the homogenized cast ingot into a blank; and (3) hot rolling: heating and preserving the heat of the forging stock, and performing hot rolling to obtain a hot rolled plate; pre-quenching: performing complete austenitizing treatment on the hot rolled plate, and cooling to obtain a martensite initial structure; dual phase zone annealing: heating to Ac 1-Ac 3 temperature to perform dual-phase zone annealing; low temperature carbon diffusion: heating to 280-400 ℃ and preserving heat for 20-80 min, and obtaining the low manganese content medium manganese steel through low-temperature carbon diffusion and secondary carbon distribution; wherein the manganese content in the low-manganese-content medium-manganese steel is lower than 4 percent by mass percent. The manganese element mass percentage of the manganese steel is below 3.4%, the component design is reasonable, the preparation process is simple, the cost is low, the production efficiency is high, and the product of strength and plastic can reach 43 GPa.
Description
Technical Field
The invention relates to the technical field of advanced high-strength steel, in particular to a preparation method of low-manganese-content medium-manganese steel.
Background
The third generation advanced high-strength steel, such as medium manganese steel, QP steel and the like, is mainly prepared by the chemical composition design with low alloy content and adopting a simple production process, and is low in cost, easy to prepare and high in strength-plastic product reaching 25-45 GPa percent. As a third generation advanced high-strength steel, medium manganese steel is produced by reducing the manganese content based on the chemical composition of high manganese/ultra-high manganese steel. The carbon and manganese elements play a key role in the thermal stability of the reverse transformation austenite of the double-phase region of the medium manganese steel. The carbon element mainly plays a role in solid solution strengthening, and simultaneously increases the thermal stability of the reverse transformed austenite, so that the reverse transformed austenite has higher content of residual austenite in a room-temperature microstructure, and can generate more remarkable transformation induced plasticity effect (namely TRIP effect) during deformation. However, too high a carbon content may reduce the weldability. Manganese is also an austenite forming element, can increase the thermal stability of supercooled austenite, improves the hardenability of steel, and is very beneficial to increasing the content of residual austenite in a room-temperature structure. However, too high manganese content can lead to uneven microstructure, is easy to generate banded structure, is unfavorable for production and processing, and is easy to crack during rolling; in addition, since the diffusion rate of manganese atoms is slow and the partitioning time is long, in order to allow manganese atoms to be sufficiently partitioned into the reverse transformed austenite so as to obtain a higher content of residual austenite at room temperature, it is required that the duplex region annealing time be as long as several hours or even several tens of hours (Wang Chang, xu Haifeng, huang Chongxiang, cao Wenquan, dong Han, the evolution of the reverse transformation annealing structure of manganese steel and the partitioning behavior of manganese. Steel research report, 2016, vol.28, p. 38-46), which not only reduces the production efficiency but also increases the production cost.
Chinese patent No. CN 104651734B discloses a 1000 MPa-level high-strength high-plasticity aluminum-containing medium manganese steel and a method for manufacturing the same, wherein Al, cr, mo, cu elements are added into the steel for alloying, and hot continuous rolling, cap annealing, cold rolling, continuous annealing and other procedures are adopted to prepare the high-strength high-plasticity medium manganese steel; however, the mass percentage of manganese element in the steel is as high as 7-11%, and the required annealing time is more than 10 hours. Chinese patent No. CN 110408861B discloses a cold rolled high-strength product medium manganese steel with low manganese content and its preparation method, the medium manganese steel has high strength product; however, the mass fraction of Mn element in the steel is still high and reaches 6%, and the high content of Al, si, cr, ni and other elements are added, so that the annealing time of the dual-phase zone is 1-30 h. The chemical composition of the medium manganese steel reported in the current literature or disclosed in the patent is approximately 0.1 to 0.6wt% of C and 4 to 12 wt% of Mn (HuB, luo H, yang F, et al Recent progress in medium-Mn steels made with new designing strategies, a review. Journal of Materials Science & Technology,2017, vol.33, p. 1457-1464). If the manganese content is further reduced, the heat stability of the reverse transformed austenite formed in the duplex region may be deteriorated, resulting in difficulty in obtaining a sufficient content of residual austenite after annealing in the duplex region, and thus failing to exert the TRIP effect of the medium manganese steel.
In addition, the literature reports low density medium manganese steels of the Fe-Mn-Al-C series, which utilize the light weight characteristic of Al, and the addition of aluminum to the steel can greatly reduce the density of the steel (Lee S, kang S H, nam J H, et Al Effect of tempering on the microstructure and tensile properties of a martensitic medium-Mn light weight steel metal matrix Trans A,2019, vol.50, p.2655). The density of the steel can be reduced by 17% per 12% (mass fraction) of aluminum added. In addition, it has been attempted to temper Fe-Mn-Al-C based low density medium manganese steel after dual phase zone annealing, and to precipitate fine cementite or coarse kappa-carbide on the martensitic matrix by the tempering, thereby regulating the properties of the steel (Lee S, kang S H, nam J H, et Al effect of tempering on the microstructure and tensile properties of a martensitic medium-Mn light weight steel. Metallic matrix Trans A,2019, vol.50, p. 2655). However, these low-density Fe-Mn-Al-C steels have high contents of carbon, manganese and aluminum elements, and often have poor mechanical properties due to the presence of coarse kappa-carbides.
Disclosure of Invention
The invention aims to provide a preparation method of high-strength plastic product low-manganese-content medium manganese steel, which has the advantages of reasonable components, simple preparation process, short annealing time of a two-phase region and subsequent low-temperature carbon diffusion time in the preparation process, low cost and high production efficiency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a preparation method of low-manganese-content medium-manganese steel, which comprises the following steps:
1) Smelting: smelting the alloy ingredients of the low-manganese-content medium-manganese steel, and casting into ingots;
2) Homogenizing and forging: homogenizing the cast ingot obtained in the step 1), and forging the homogenized cast ingot into a blank;
3) And (3) hot rolling: heating and preserving heat of the forged forging stock, and performing hot rolling to obtain a hot rolled plate;
4) Pre-quenching: performing complete austenitizing treatment on a hot rolled plate obtained by hot rolling, and cooling to obtain a martensite initial structure;
5) Dual phase zone annealing: heating the pre-quenched sample to Ac 1-Ac 3 temperature to perform dual-phase zone annealing;
6) Low temperature carbon diffusion: heating the sample annealed in the two-phase region to 280-400 ℃ and preserving heat for 20-80 min, and obtaining the low-manganese-content medium manganese steel through low-temperature carbon diffusion and secondary carbon distribution;
wherein the manganese content in the low-manganese-content medium-manganese steel is lower than 4 percent by mass percent.
As a preferred embodiment, the low manganese content medium manganese steel comprises the following chemical components in percentage by mass: 0.26 to 0.48 percent of carbon, 2.1 to 3.4 percent of manganese, 1.0 to 2.2 percent of aluminum, 0.6 to 2.0 percent of silicon, and the balance of iron and unavoidable impurities.
In a preferred embodiment, in step 1), the smelting is vacuum induction furnace smelting.
In the step 2), the homogenization treatment is carried out at 1200-1250 ℃ for 2-3 h;
in certain embodiments, the homogenization treatment is preceded by an operation that removes risers and surface scale from the ingot.
In a preferred embodiment, in the step 2), the forging temperature of the forging is 1200 to 1250 ℃;
preferably, the final forging temperature of the forging is not lower than 900 ℃.
In a preferred embodiment, in the step 3), the temperature of heating and heat preservation is 1150-1200 ℃;
preferably, the heating and heat preservation time is 20-40 min;
preferably, the initial rolling temperature of the hot rolling is 1150-1200 ℃;
preferably, the finish rolling temperature of the hot rolling is not lower than 900 ℃.
In a preferred embodiment, in the step 4), the complete austenitizing treatment is to heat the hot rolled plate obtained by hot rolling to a temperature higher than Ac3 for 10 to 30 minutes, and the temperature higher than Ac3 is preferably 920 to 970 ℃;
preferably, the cooling is water quenching or oil quenching.
In a preferred embodiment, in the step 5), the heating to the temperature of Ac1 to Ac3 is performed at a temperature of 730 to 800 ℃;
preferably, the heating time is 8-100 min;
preferably, step 5) further comprises a cooling process after the dual phase zone anneal; the cooling is water quenching or oil quenching.
As a preferred embodiment, step 6) further comprises a cooling process; the cooling is water quenching or oil quenching or natural cooling in air.
In the technical scheme of the invention, the microstructure of the low-manganese-content medium-manganese steel consists of ferrite, residual austenite and a small amount of tempered martensite which are alternately arranged in the sheet layers, wherein the volume fraction of the residual austenite can reach 24%, and the ferrite content can reach 65% maximally; the low-manganese-content medium manganese steel has excellent mechanical properties, and the strength-plastic product is 32-43 GPa percent.
The technical scheme has the following advantages or beneficial effects:
the method for reducing the manganese content and adding a small amount of aluminum and silicon elements is used for designing the components of the low-manganese-content medium-manganese steel, and the high-strength plastic product low-manganese-content medium-manganese steel is obtained through a dual-step carbon distribution process of dual-phase zone annealing and low-temperature carbon diffusion.
The design idea of the low-manganese-content medium-manganese steel is as follows:
1) Considering the problem that simply reducing the manganese content can cause poor thermal stability of the duplex region reverse transformation austenite, so that the medium manganese steel is difficult to obtain enough residual austenite at room temperature or cannot obtain residual austenite at all, and therefore excellent mechanical properties are difficult to obtain, the method reduces the manganese content on the basis of the chemical components of the conventional medium manganese steel, utilizes the Al element to promote the characteristic that C element and Mn element are distributed from ferrite into duplex region austenite in the duplex region annealing process, improves the thermal stability of supercooled austenite, and further obtains enough residual austenite at room temperature; in the prior art, the main function of the Al element in the medium manganese steel, especially the Fe-Mn-Al-C series low-density medium manganese steel is to reduce the weight;
2) Although the addition of a small amount of Al is beneficial to the medium manganese steel to obtain the residual austenite with sufficient content at room temperature, the mechanical stability of the residual austenite is also lower because of the lower manganese content, which is disadvantageous to the mechanical properties of the medium manganese steel; according to the invention, by utilizing the characteristic that Si element can inhibit carbide precipitation in the low-temperature heating process, the secondary distribution effect of carbon is achieved by carrying out low-temperature carbon diffusion on the medium manganese steel annealed in the dual-phase region, so that the residual austenite is further rich in carbon, the mechanical stability of the residual austenite is improved, and the strong plastic product of the medium manganese steel with low manganese content is greatly improved;
the low-manganese-content medium-manganese steel provided by the invention has the advantages of lower manganese content, simple preparation process, short annealing time of a dual-phase region and short low-temperature carbon diffusion time, and can improve the production efficiency and reduce the production cost.
Drawings
FIG. 1 is a stress strain graph of low manganese content medium manganese steel obtained in example 1 of the present invention.
FIG. 2 is a scanning electron micrograph of a low manganese content medium manganese steel obtained in example 1 of the present invention.
FIG. 3 is a scanning electron micrograph of a low manganese content medium manganese steel obtained in example 2 of the present invention.
FIG. 4 is a scanning electron micrograph of a low manganese content medium manganese steel obtained in example 3 of the present invention.
Detailed Description
The following examples are only some, but not all, of the examples of the invention. Accordingly, the detailed description of the embodiments of the invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to fall within the scope of the present invention.
In the present invention, all the equipment, raw materials and the like are commercially available or commonly used in the industry unless otherwise specified. The methods in the following examples are conventional in the art unless otherwise specified.
Example 1:
in the embodiment, the low-manganese medium-manganese steel comprises the following chemical components in percentage by mass: carbon 0.38%, manganese 2.6%, aluminum 1.5%, silicon 1.5%, the balance being iron and unavoidable impurities.
The preparation process comprises the following steps:
1) Smelting: alloy proportioning is carried out according to the chemical components, a vacuum induction furnace is adopted for smelting, molten steel is cast into ingots, and the ingots are slowly cooled to room temperature;
2) Forging and hot rolling: removing riser and surface oxide skin from the cast ingot, carrying out homogenizing annealing treatment at 1250 ℃ for 2 hours, discharging from a furnace, and forging, wherein the forging temperature is 1200 ℃ and the final forging temperature is 940 ℃; air-cooling to room temperature, wherein the thickness of the forging stock is 35mm; then preserving the temperature of the forging stock at 1200 ℃ for 0.5h, hot-rolling the forging stock into a hot-rolled plate with the thickness of 4mm after discharging, wherein the initial rolling temperature is 1150 ℃, the final rolling temperature is 900 ℃, and finally air-cooling to room temperature;
3) Pre-quenching: heating the hot rolled plate after hot rolling to 950 ℃ and preserving heat for 20min to carry out complete austenitizing, and then carrying out oil quenching and cooling to room temperature to obtain a martensite initial structure;
4) Dual phase zone annealing: heating the pre-quenched sample to 745 ℃, preserving heat for 50min, carrying out dual-phase zone annealing, and then carrying out oil quenching and cooling to room temperature;
5) Low temperature carbon diffusion: and (3) heating the sample annealed in the two-phase region to 400 ℃ again, preserving heat for 20min, performing low-temperature carbon diffusion and secondary carbon compounding treatment, and then performing oil quenching and cooling to room temperature.
FIG. 1 is a stress strain curve of low manganese content medium manganese steel obtained in the examples; FIG. 2 is a microstructure scanning electron microscope image of the low manganese content medium manganese steel obtained in this example. The low-manganese-content medium manganese steel obtained in the embodiment contains 22% of retained austenite by volume fraction, the tensile strength is 1128MPa, the yield strength is 725MPa, the elongation is 38%, the strength-plastic product reaches 43GPa, and the strength-plastic product level of the medium manganese steel with higher manganese content is achieved.
Example 2
In the embodiment, the low-manganese medium-manganese steel comprises the following chemical components in percentage by mass: carbon 0.48%, manganese 2.1%, aluminum 1.0%, silicon 1.0%, the balance being iron and unavoidable impurities.
The preparation process comprises the following steps:
1) Smelting: alloy proportioning is carried out according to the chemical components, a vacuum induction furnace is adopted for smelting, molten steel is cast into ingots, and the ingots are slowly cooled to room temperature;
2) Forging and hot rolling: removing riser and surface oxide skin from the cast ingot, carrying out homogenizing annealing treatment at 1200 ℃ for 3 hours, discharging from the furnace, and forging, wherein the forging temperature is 1200 ℃, and the final forging temperature is 900 ℃; air-cooling to room temperature, wherein the thickness of the forging stock is 35mm; then preserving the temperature of the forging stock at 1200 ℃ for 0.5h, hot-rolling the forging stock into a hot-rolled plate with the thickness of 4mm after discharging, wherein the initial rolling temperature is 1150 ℃, the final rolling temperature is 900 ℃, and finally air-cooling to room temperature;
3) Pre-quenching: heating the hot rolled plate after hot rolling to 920 ℃, preserving heat for 30min to carry out complete austenitizing, and then quenching the hot rolled plate with water and cooling the hot rolled plate to room temperature to obtain a martensite initial structure;
4) Dual phase zone annealing: heating the pre-quenched sample to 785 ℃ and preserving heat for 8min, carrying out dual-phase zone annealing, and then carrying out oil quenching and cooling to room temperature;
5) Low temperature carbon diffusion: and (3) heating the sample annealed in the two-phase region to 320 ℃ for 40min, performing low-temperature carbon diffusion and secondary carbon partitioning treatment, and then performing air cooling to room temperature.
FIG. 3 is a microstructure scanning electron microscope image of the low manganese content medium manganese steel obtained in this example. The low-manganese-content medium manganese steel obtained in the embodiment contains 24% of residual austenite by volume fraction, the tensile strength is 1228MPa, the yield strength is 848MPa, the elongation is 33.5%, the strength-plastic product reaches 41GPa, and the strength-plastic product level of the medium manganese steel with higher manganese content is achieved.
Example 3
In the embodiment, the low-manganese medium-manganese steel comprises the following chemical components in percentage by mass: carbon 0.26%, manganese 3.4%, aluminum 2.2%, silicon 1.8%, and the balance of iron and unavoidable impurities.
The preparation process comprises the following steps:
1) Smelting: alloy proportioning is carried out according to the chemical components, a vacuum induction furnace is adopted for smelting, molten steel is cast into ingots, and the ingots are slowly cooled to room temperature;
2) Forging and hot rolling: after removing a riser and surface oxide skin from an ingot, carrying out homogenizing annealing treatment at 1200 ℃ for 2.5 hours, discharging, and forging, wherein the forging temperature is 1200 ℃, and the final forging temperature is 920 ℃; air-cooling to room temperature, wherein the thickness of the forging stock is 30mm; then preserving the temperature of the forging stock at 1200 ℃ for 0.5h, hot-rolling the forging stock into a hot-rolled plate with the thickness of 4mm after discharging, wherein the initial rolling temperature is 1150 ℃, the final rolling temperature is 900 ℃, and finally air-cooling to room temperature;
3) Pre-quenching: heating the hot rolled plate after hot rolling to 970 ℃, preserving heat for 10min to carry out complete austenitizing, and then quenching the hot rolled plate with water and cooling the hot rolled plate to room temperature to obtain a martensite initial structure;
4) Dual phase zone annealing: heating the pre-quenched sample to 765 ℃ and preserving heat for 15min, carrying out dual-phase zone annealing, and then carrying out oil quenching and cooling to room temperature;
5) Low temperature carbon diffusion: and (3) heating the sample annealed in the two-phase region to 360 ℃ for 30min, performing low-temperature carbon diffusion and secondary carbon compounding treatment, and then performing water quenching and cooling to room temperature.
FIG. 4 is a microstructure scanning electron microscope image of the low manganese content medium manganese steel obtained in this example. The low manganese content medium manganese steel obtained in the embodiment contains 20% of retained austenite by volume fraction, the tensile strength is 1185MPa, the yield strength is 812MPa, the elongation is 35%, and the strong plastic product reaches 41.4GPa%.
Example 4
In the embodiment, the low-manganese medium-manganese steel comprises the following chemical components in percentage by mass: carbon 0.34%, manganese 3.0%, aluminum 1.8%, silicon 0.6%, the balance being iron and unavoidable impurities.
The preparation process comprises the following steps:
1) Smelting: alloy proportioning is carried out according to the chemical components, a vacuum induction furnace is adopted for smelting, molten steel is cast into ingots, and the ingots are slowly cooled to room temperature;
2) Forging and hot rolling: removing riser and surface oxide skin from the cast ingot, carrying out homogenizing annealing treatment at 1200 ℃ for 3 hours, discharging from the furnace, and forging, wherein the forging temperature is 1200 ℃, and the final forging temperature is 900 ℃; air-cooling to room temperature, wherein the thickness of the forging stock is 40mm; then preserving the temperature of the forging stock at 1200 ℃ for 0.5h, hot-rolling the forging stock into a hot-rolled plate with the thickness of 4mm after discharging, wherein the initial rolling temperature is 1150 ℃, the final rolling temperature is 900 ℃, and finally air-cooling to room temperature;
3) Pre-quenching: heating the hot rolled plate after hot rolling to 950 ℃ and preserving heat for 20min to carry out complete austenitizing, and then carrying out oil quenching and cooling to room temperature to obtain a martensite initial structure;
4) Dual phase zone annealing: heating the pre-quenched sample to 730 ℃ and preserving heat for 100min, carrying out dual-phase zone annealing, and then cooling the pre-quenched sample to room temperature by water quenching;
5) Low temperature carbon diffusion: and (3) heating the sample annealed in the two-phase region to 280 ℃ for 80min, performing low-temperature carbon diffusion and secondary carbon compounding treatment, and then performing water quenching and cooling to room temperature.
The low-manganese-content medium-manganese steel obtained in the embodiment contains 12% of retained austenite by volume fraction, the tensile strength is 1090MPa, the yield strength is 650MPa, the elongation is 36%, the strength-plastic product is 39.2GPa, and the requirements of the third-generation advanced high-strength steel on the strength, the plasticity and the strength-plastic product are met.
The foregoing is only a preferred embodiment of the present invention. It should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (7)
1. The preparation method of the medium manganese steel with low manganese content is characterized by comprising the following steps:
1) Smelting: smelting the alloy ingredients of the low-manganese-content medium-manganese steel, and casting into ingots;
2) Homogenizing and forging: homogenizing the cast ingot obtained in the step 1), and forging the homogenized cast ingot into a blank;
3) And (3) hot rolling: heating and preserving heat of the forged forging stock, and performing hot rolling to obtain a hot rolled plate;
4) Pre-quenching: performing complete austenitizing treatment on a hot rolled plate obtained by hot rolling, and cooling to obtain a martensite initial structure;
5) Dual phase zone annealing: heating the pre-quenched sample to Ac 1-Ac 3 temperature to perform dual-phase zone annealing;
6) Low temperature carbon diffusion: heating the sample annealed in the two-phase region to 280-400 ℃ and preserving heat for 40-80 min, and obtaining the low-manganese-content medium manganese steel through low-temperature carbon diffusion and secondary carbon distribution;
wherein the low-manganese-content medium-manganese steel comprises the following chemical components in percentage by mass: 0.34 to 0.48 percent of carbon, 2.1 to 3.4 percent of manganese, 1.0 to 2.2 percent of aluminum, 0.6 to 2.0 percent of silicon, and the balance of iron and unavoidable impurities;
in the step 2), the homogenization treatment is carried out at 1200-1250 ℃ for 2-3 hours;
in the step 3), the temperature of heating and heat preservation is 1150-1200 ℃; the heating and heat preserving duration is 20-40 min; the initial rolling temperature of the hot rolling is 1150-1200 ℃; the final rolling temperature of the hot rolling is not lower than 900 ℃;
in the step 4), the complete austenitizing treatment is to heat the hot rolled plate obtained by hot rolling to a temperature higher than Ac3 for 10-20 min, wherein the temperature higher than Ac3 is 920-970 DEG C
In the step 5), the heating to the Ac 1-Ac 3 temperature is performed at 730-800 ℃, and the heating time is 50-100 min.
2. The method according to claim 1, wherein in step 1), the smelting is vacuum induction furnace smelting.
3. The method of claim 1, wherein in step 2), the step of removing the riser and surface scale from the ingot is further included before the homogenizing treatment.
4. The method according to claim 1, wherein in step 2), the forging temperature for forging is 1200 to 1250 ℃;
the final forging temperature of the forging is not lower than 900 ℃.
5. The method according to claim 1, wherein in step 4), the cooling is water quenching or oil quenching.
6. The method of claim 1, wherein step 5) further comprises a cooling process after the dual phase zone anneal; the cooling is water quenching or oil quenching.
7. The method of claim 1, wherein step 6) further comprises a cooling process; the cooling is water quenching or oil quenching or natural cooling in air.
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