CN113941430B - Wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, preparation method and application - Google Patents
Wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, preparation method and application Download PDFInfo
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- CN113941430B CN113941430B CN202111193509.9A CN202111193509A CN113941430B CN 113941430 B CN113941430 B CN 113941430B CN 202111193509 A CN202111193509 A CN 202111193509A CN 113941430 B CN113941430 B CN 113941430B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- 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
- Y02P10/20—Recycling
Abstract
The invention discloses wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, which comprises the following chemical element components in percentage by mass: c:1.2 to 1.6 percent; mn:18% -26%, mo:1.0 to 2.0 percent, V:0.3 to 1.2 percent, nb:0.04 to 0.08 percent, si:0.3 to 0.5 percent, P: less than or equal to 0.003 percent, S: less than or equal to 0.005 percent, the balance of Fe and other unavoidable impurities, and the microstructure of the wear-resistant high manganese steel is austenite. The invention controls the stacking fault energy to 20-40 mJ/m 2 In the range of (2) the TWIP effect is generated in the production and use process of the lining plate, twin crystals are generated, the wear resistance is improved, the TRIP effect is avoided, deformation martensite is not generated, the surface deformation rejection of the lining plate is avoided, the service life is prolonged, and the mine production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of high manganese steel preparation, and particularly relates to wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening and a preparation method thereof.
Background
Austenitic manganese steel is dominant in wear-resistant fittings because austenitic manganese steel has excellent impact toughness and excellent work hardening performance, and on the premise of not causing fracture failure, the surface is impacted to generate work hardening, so that the performance characteristics of hard surface and tough core are obtained, and therefore, large-scale crushing equipment generally adopts ultrahigh manganese steel as the wear-resistant fittings for impact wear resistance.
However, the conventional high manganese steel has the following problems in that the original hardness is low, the surface hardness of the high manganese steel is improved by virtue of martensitic transformation, and the wear resistance is improved: (1) The yield strength is generally about 340MPa, the performance requirement of the engineering component under high stress cannot be met, serious plastic deformation occurs, failure is caused in the early stage of the service process, and the service life is influenced; (2) TRIP effect can be generated after the material surface is impacted, deformation martensite is generated on the working surface of the wear-resistant part, volume expansion is generated on the working surface, stress difference is generated in different areas of the workpiece, and the workpiece is deformed due to the stress; 3) The high manganese steel is of an austenitic structure after being subjected to water toughening treatment, has low initial hardness (HB 180-220), has low abrasive wear resistance, and cannot fully exert abrasive wear resistance when being used under the working conditions of high-hardness abrasive and low impact stress.
Disclosure of Invention
The invention aims to provide wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, which does not generate martensitic transformation, so as to overcome the technical problems.
Wear-resistant high manganese steel based on the TWIP effect and nano precipitation strengthening, comprising, in weight%, carbon (C): 1.2 to 1.6 percent, manganese (Mn): 16-26%, niobium (Nb): 0.04 to 0.08 percent, silicon (Si): 0.3 to 0.5 percent, phosphorus (P): less than 0.003% and not including 0%, sulfur (S): 0.005% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 25 to 40mJ/m 2 ，
Relation formula:
SFE(mJ/m 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×si, wherein Mn, C, si refer to the weight percentage of each component content.
Further, carbon (C) is included in weight%: 1.4 to 1.5 percent, manganese (Mn): 16-18%, niobium (Nb): 0.04 to 0.06 percent, silicon (Si): 0.4% -0.5%, phosphorus (P): less than 0.0025% and excluding 0%, sulfur (S): 0.004% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 31-33mJ/m 2 ，
Relation formula:
SFE(mJ/m 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×si, wherein Mn, C, si refer to the weight percentage of each component content.
Further, carbon (C) is included in weight%: 1.5%, manganese (Mn): 18%, niobium (Nb): 0.04%, silicon (Si): 0.5%, phosphorus (P): less than 0.0025% and excluding 0%, sulfur (S): 0.004% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 32mJ/m 2 ，
Relation formula:
SFE(mJ/m 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×si, wherein Mn, C, si refer to the weight percentage of each component content.
Further, the alloy comprises the following chemical elements in percentage by weight: molybdenum (Mo): 1.0 to 2.0 percent, vanadium (V): 0.3 to 1.2 percent, wherein carbide with the size not more than 10 mu m is formed in the austenite, and the carbide is Mo 2 C and VC.
Further, the alloy comprises the following chemical elements in percentage by weight: molybdenum (Mo): 1.2%, vanadium (V): 0.8%.
The invention further aims at providing a preparation method of wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, which comprises the following steps: comprising carbon (C): 1.2 to 1.6 percent, manganese (Mn): 18-26%, molybdenum (Mo): 1.0 to 2.0 percent, vanadium (V): 0.3 to 1.2 percent, niobium (Nb): 0.04 to 0.08 percent, silicon (Si): 0.3 to 0.5 percent, phosphorus (P): less than 0.003% and not including 0%, sulfur (S): less than 0.005% and not containing 0% of Fe and other unavoidable impurities, wherein the microstructure of the wear-resistant high manganese steel is austenite;
(1) Smelting and refining: smelting by adopting an induction furnace or an electric arc furnace with an alkaline furnace lining, firstly adding scrap steel and high-carbon ferromanganese, sequentially adding ferromolybdenum, medium-carbon ferromanganese, low-carbon ferromanganese, micro-carbon ferromanganese, manganese metal and ferrovanadium after smelting, completely smelting, adjusting components until the components meet the mass percentage requirements of the chemical components of the high-manganese steel, heating to 1480-1580 ℃, preserving heat for 2-5min, and adopting argon blowing refining in the furnace or in a ladle to obtain high-manganese steel liquid;
(2) Tapping and modification: pouring high manganese steel liquid into a ladle, wherein the tapping temperature is 1420-1520 ℃, and adopting a niobium-containing rare earth alloy modifier to carry out modification treatment on the high manganese steel liquid in the ladle;
(3) Pouring: pouring the molten steel subjected to modification treatment into a casting mold cavity prepared in advance, wherein the pouring temperature is 1380-1420 ℃;
(4) Cleaning: after casting for 4-12 hours, pouring, cleaning a box, removing a dead head, cleaning burrs and burrs, and polishing dead head stubs;
(5) And (3) water toughening treatment: heating the cleaned casting to 650 ℃ at a speed of 80-100 ℃/h, preserving heat for 2-4 h, reheating to 1050-1080 ℃, preserving heat for 3-5 h, discharging, and quenching into water with a water temperature lower than 40 ℃.
Further, in the step (2), a ladle flushing method is adopted for carrying out modification treatment, modifier is added into the ladle bottom before tapping, molten steel is flushed, and the addition amount is 0.1-0.5% of the treated molten steel;
further, in the step (2), the modification treatment is carried out by adopting a wire feeding method, and the addition amount of the modifier is 0.05-0.15%.
The invention further aims at the application of the prepared wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening in a large semi-automatic mill lining plate, wherein the yield strength of the large semi-automatic mill lining plate is more than or equal to 400MPa, the tensile strength is more than or equal to 850MPa, and the impact energy is more than or equal to 30J.
The invention relates to wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, which has the following beneficial effects:
(1) By controlling the stacking fault energy to be between 25 and 40mJ/m 2 In the range of (2) the TWIP effect is generated in the production and use process of the lining plate, twin crystals are generated, the wear resistance is improved, the TRIP effect is avoided, deformation martensite is not generated, the surface deformation and scrapping of the lining plate are avoided, the service life is prolonged, and the mine production cost is reduced;
(2) The carbide formed acts to pin grain boundary refinement grains, and Mo formed in the grains 2 The C and VC granular carbide can further enhance the yield strength and the initial hardness of the material and improve the wear resistance of the high manganese steel.
Detailed Description
In the description of the present invention, unless otherwise indicated, the terms "upper," "lower," "left," "right," "front," "rear," and the like are merely for the purpose of describing the present invention and simplifying the description, and do not indicate or imply that the devices or structures being referred to must have a particular orientation and are not to be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening is used for producing large semi-automatic mill lining plates, the yield strength of the large semi-automatic mill lining plates is more than or equal to 400MPa, the tensile strength is more than or equal to 850MPa, and the impact energy is more than or equal to 30J; the wear-resistant high manganese steel comprises carbon (C) in weight percent: 1.2 to 1.6 percent, manganese (Mn): 16-26%, molybdenum (Mo): 1.0 to 2.0 percent, vanadium (V): 0.3 to 1.2 percent, niobium (Nb): 0.04 to 0.08 percent, silicon (Si): 0.3 to 0.5 percent, phosphorus (P): less than 0.003% and not including 0%, sulfur (S): less than 0.005% and not containing 0%, the balance of Fe and other unavoidable impurities; wherein the microstructure of the wear-resistant Gao Meng steel is austenite, carbides with the size not more than 10 mu m are formed in the austenite, and the carbides are Mo 2 C and VC, said austenite having an stacking fault energy of 25-40mJ/m represented by the following relation 2 Relation formula: SFE (mJ/m) 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×si, wherein Mn, C, si refer to the weight percentage of each component content.
Further preferably, carbon (C) is included in weight%: 1.4 to 1.5 percent, manganese (Mn): 16-18%, molybdenum (Mo): 1.2 to 1.5 percent of vanadium (V): 0.4 to 0.8 percent, niobium (Nb): 0.04 to 0.06 percent, silicon (Si): 0.4% -0.5%, phosphorus (P): less than 0.0025% and excluding 0%, sulfur (S): 0.004% or less and not containing 0% of Fe and other unavoidable impurities in the balance; the microstructure of the wear-resistant high manganese steel is austenite, and the stacking fault energy expressed by the following relational expression is 31-33mJ/m 2 Relation formula: SFE (mJ/m) 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976-40.111 Si, wherein Mn, C, si refer to the componentsThe weight percentage of the content.
Further, carbon (C) is contained in weight%: 1.5%, manganese (Mn): 18%, molybdenum (Mo): 1.2% >, vanadium (V): 0.8%, niobium (Nb): 0.04%, silicon (Si): 0.5%, phosphorus (P): less than 0.0025% and excluding 0%, sulfur (S): 0.004% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 32mJ/m 2 Relation formula: SFE (mJ/m) 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×si, wherein Mn, C, si refer to the weight percentage of each component content.
The invention further aims at providing a preparation method of wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, which comprises the following steps: comprising carbon (C): 1.2 to 1.6 percent, manganese (Mn): 18-26%, molybdenum (Mo): 1.0 to 2.0 percent, vanadium (V): 0.3 to 1.2 percent, niobium (Nb): 0.04 to 0.08 percent, silicon (Si): 0.3 to 0.5 percent, phosphorus (P): less than 0.003% and not including 0%, sulfur (S): less than 0.005% and not containing 0% of Fe and other unavoidable impurities, wherein the microstructure of the wear-resistant high manganese steel is austenite; (1) smelting and refining: smelting by adopting an induction furnace or an electric arc furnace with an alkaline furnace lining, firstly adding scrap steel and high-carbon ferromanganese, sequentially adding ferromolybdenum, medium-carbon ferromanganese, low-carbon ferromanganese, micro-carbon ferromanganese, manganese metal and ferrovanadium after smelting, completely smelting, adjusting components until the components meet the mass percentage requirements of the chemical components of the high-manganese steel, heating to 1480-1580 ℃, preserving heat for 2-5min, and adopting argon blowing refining in the furnace or in a ladle to obtain high-manganese steel liquid; and (2) tapping and modification: pouring high manganese steel liquid into a ladle, and adopting a niobium-containing rare earth alloy modifier to carry out modification treatment on the high manganese steel liquid in the ladle, wherein the steel tapping temperature is 1420-1520 ℃, and the modification treatment adopts the following modes: before tapping, adding modifier into the ladle bottom, and then pouring molten steel, wherein the adding amount is 0.1% -0.5% of the treated molten steel; or by the following means: carrying out modification treatment by adopting a wire feeding method, wherein the addition amount of the modifier is 0.05% -0.15%; (3) casting: pouring the molten steel subjected to modification treatment into a casting mold cavity prepared in advance, wherein the pouring temperature is 1380-1420 ℃; (4) cleaning: after casting for 4-12 hours, pouring, cleaning a box, removing a dead head, cleaning burrs and burrs, and polishing dead head stubs; (5) water toughening treatment: heating the cleaned casting to 650 ℃ at a speed of 80-100 ℃/h, preserving heat for 2-4 h, reheating to 1050-1080 ℃, preserving heat for 3-5 h, discharging, and quenching into water with a water temperature lower than 40 ℃.
The following examples are provided to illustrate the invention:
example 1
The wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening comprises the following chemical components: c1.4%, mn 16.0%, si 0.4%, P:<0.0025％，S:<0.004%, mo 1.5%, V0.4%, nb 0.06%, the balance being Fe, the stacking fault energy being 31.80mJ/m 2 。
The production process of the wear-resistant high-manganese steel based on TWIP effect and nano precipitation strengthening comprises the following steps of:
(1) Smelting and refining: firstly adding scrap steel and high-carbon ferromanganese into an induction furnace or an electric arc furnace with an alkaline furnace lining, sequentially adding ferromolybdenum, medium-carbon ferromanganese, low-carbon ferromanganese, micro-carbon ferromanganese, manganese metal and ferrovanadium after melting, completely melting, adjusting components until the components meet the mass percentage requirements of the chemical components of the high-manganese steel, heating to 1650 ℃, preserving heat for 5min, and adopting argon blowing refining in the furnace or a ladle to obtain high-manganese steel liquid;
(2) Tapping and modification: pouring high manganese steel liquid into a steel ladle, wherein the tapping temperature is 1500 ℃, and adopting a niobium-containing rare earth alloy modifier to carry out modification treatment on the high manganese steel liquid in the steel ladle, wherein the modification treatment adopts the following modes: before tapping, adding modifier into the ladle bottom, and then pouring molten steel, wherein the adding amount is 0.3% of the treated molten steel;
(3) Pouring: pouring the molten steel subjected to modification treatment into a casting mold cavity prepared in advance, wherein the pouring temperature is 1400 ℃;
(4) Cleaning: after casting for 8 hours, casting and cleaning, removing a casting head, cleaning burrs and burrs, and polishing the casting head stub;
(5) And (3) water toughening treatment: heating the cleaned casting to 650 ℃ at a speed of 100 ℃/h, preserving heat for 2 hours, further heating to 1050 ℃, preserving heat for 5 hours, discharging, and quenching into water with a water temperature lower than 40 ℃.
Example 2
The wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening comprises the following chemical components: 1.5% of C, 18.0% of Mn, 0.5% of Si, 0.0025% of P, 0.004% of S, 1.2% of Mo, 0.8% of V, 0.04% of Nb, the balance of Fe and the error energy of 32.00mJ/m 2 。
The production process of the wear-resistant high-manganese steel based on TWIP effect and nano precipitation strengthening comprises the following steps of:
(1) Smelting and refining: smelting by adopting an induction furnace or an electric arc furnace with an alkaline furnace lining, firstly adding scrap steel and high-carbon ferromanganese, sequentially adding ferromolybdenum, medium-carbon ferromanganese, low-carbon ferromanganese, micro-carbon ferromanganese, manganese metal and ferrovanadium after smelting, completely smelting, adjusting components until the components meet the mass percentage requirements of the chemical components of the high-manganese steel, heating to 1580 ℃, preserving heat for 2-5min, and adopting argon blowing refining in the furnace or a ladle to obtain high-manganese steel liquid;
(2) Tapping and modification: pouring high manganese steel liquid into a steel ladle, wherein the tapping temperature is 1420 ℃, and adopting a niobium-containing rare earth alloy modifier to carry out modification treatment on the high manganese steel liquid in the steel ladle, wherein the modification treatment adopts the following modes: carrying out modification treatment by adopting a wire feeding method, wherein the addition amount of the modifier is 0.1%;
(3) Pouring: pouring the molten steel subjected to modification treatment into a casting mold cavity prepared in advance, wherein the pouring temperature is 1380 ℃;
(4) Cleaning: after 10 hours of casting, casting and cleaning, removing a casting head, cleaning burrs and burrs, and polishing the casting head stub;
(5) And (3) water toughening treatment: heating the cleaned casting to 650 ℃ at a speed of 100 ℃/h, preserving heat for 4 hours, further heating to 1080 ℃, preserving heat for 5 hours, discharging, and quenching into water with a water temperature lower than 40 ℃.
Example 3
The wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening comprises the following chemical components: c is 1.2 percent,26.0% of Mn, 0.3% of Si, 0.003% of P, 0.005% of S, 2.0% of Mo, 1.2% of V, 0.08% of Nb, the balance of Fe and the stacking fault energy of 39.48mJ/m 2 。
The preparation procedure is as in example 2.
Making a sand mold according to the size specified in GB/T5680-2010 austenitic manganese steel casting for the test block for mechanical property test of the embodiment 1-3, cutting the lower half part for mechanical property test after the preparation process of the embodiment 1-3, wherein the mechanical property comprises yield strength, tensile strength, total elongation at break and impact energy, and the yield strength and the tensile strength are obtained by testing by a universal tensile testing machine; the total elongation at break is given by the formula: [ formula ]]δ(％)＝(L a -L 0 )/L 0 Wherein L is a Is the length of the sample at break, L 0 Is the original length of the sample; the impact energy is obtained by testing an impact tester, and the stacking fault energy is obtained by calculating a relational expression: [ relation type ]]SFE(mJ/m 2 )＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×si, wherein Mn, C, si refer to the weight percentage of each component content.
The experimental results are shown in the following table.
The foregoing embodiments of the present invention have been described in some detail for purposes of clarity of understanding, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening is characterized in that the wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening is used in a large semi-automatic mill lining plate, and the wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening is prepared by the following steps of% comprising carbon (C): 1.2 to 1.6 percent, manganese (Mn): 16-26%, niobium (Nb): 0.04 to 0.08 percent, silicon (Si): 0.3 to 0.5 percent, phosphorus (P): less than 0.003% and not including 0%, sulfur (S): 0.005% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 25 to 40mJ/m 2 Relation formula:
SFE＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×Si, where SFE has units of mJ/m 2 Mn, C and Si refer to the weight percentage of each component content; the paint also comprises the following chemical elements in percentage by weight: molybdenum (Mo): 1.2%, vanadium (V): 0.8%.
2. The wear resistant high manganese steel based on TWIP effect and nano precipitation strengthening according to claim 1, characterized in that it comprises carbon (C) in weight-%: 1.4 to 1.5 percent, manganese (Mn): 16-18%, niobium (Nb): 0.04 to 0.06 percent, silicon (Si): 0.4% -0.5%, phosphorus (P): less than 0.0025% and excluding 0%, sulfur (S): 0.004% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 31-33mJ/m 2 Relation formula:
SFE＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×Si, where SFE has units of mJ/m 2 Mn, C and Si refer to the weight percentage of each component.
3. The wear resistant high manganese steel based on TWIP effect and nano precipitation strengthening according to claim 2, characterized in that it comprises carbon (C) in weight-%: 1.5%, manganese (Mn): 18%, niobium (Nb): 0.04%, silicon (Si): 0.5%, phosphorus (P): less than 0.0025% and excluding 0%, sulfur (S): 0.004% or less and not containing 0% by weight of Fe and other unavoidable impurities, the microstructure of the wear-resistant high manganese steel being austenite, the stacking fault energy represented by the following relational expression being 32mJ/m 2 Relation formula:
SFE＝4.356+0.075*Mn 2 -2.090*Mn-5.532*c 2 +48.976×c-40.111×Si, where SFE has units of mJ/m 2 Mn, C and Si refer to the weight percentage of each component.
4. The wear resistant high manganese steel based on TWIP effect and nano precipitation strengthening according to any of claims 1 to 3, further comprising the following chemical elements in weight-%: molybdenum (Mo): 1.2%, vanadium (V): 0.8% of carbide with a size of not more than 10 μm is formed in the austenite, the carbide being Mo 2 C and VC.
5. A method for producing a wear resistant high manganese steel based on TWIP effect and nano precipitation strengthening according to any one of claims 1 to 4, comprising the steps of: comprising carbon (C): 1.2 to 1.6 percent, manganese (Mn): 18-26%, molybdenum (Mo): 1.2%, vanadium (V): 0.8%, niobium (Nb): 0.04 to 0.08 percent, silicon (Si): 0.3 to 0.5 percent, phosphorus (P): less than 0.003% and not including 0%, sulfur (S): less than 0.005% and not containing 0% of Fe and other unavoidable impurities, wherein the microstructure of the wear-resistant high manganese steel is austenite;
(1) Smelting and refining: smelting by adopting an induction furnace or an electric arc furnace with an alkaline furnace lining, firstly adding scrap steel and high-carbon ferromanganese, sequentially adding ferromolybdenum, medium-carbon ferromanganese, low-carbon ferromanganese, micro-carbon ferromanganese, manganese metal and ferrovanadium after smelting, completely smelting, adjusting components until the components meet the mass percentage requirements of the chemical components of the high-manganese steel, heating to 1580-1680 ℃, preserving heat for 2-5min, and adopting argon blowing refining in the furnace or in a ladle to obtain high-manganese steel liquid;
(2) Tapping and modification: pouring high manganese steel liquid into a ladle, wherein the tapping temperature is 1420-1520 ℃, and adopting a niobium-containing rare earth alloy modifier to carry out modification treatment on the high manganese steel liquid in the ladle;
(3) Pouring: pouring the molten steel subjected to modification treatment into a casting mold cavity prepared in advance, wherein the pouring temperature is 1380-1420 ℃;
(4) Cleaning: after casting for 4-12 hours, pouring, cleaning a box, removing a dead head, cleaning burrs and burrs, and polishing dead head stubs;
(5) And (3) water toughening treatment: heating the cleaned casting to 650 ℃ at a speed of 80-100 ℃/h, preserving heat for 2-4 h, reheating to 1050-1080 ℃, preserving heat for 3-5 h, discharging, and quenching into water with a water temperature lower than 40 ℃.
6. The method for producing a high manganese steel for wear resistance based on TWIP effect and nano precipitation strengthening according to claim 5, wherein in step (2), a ladle is used for the modification treatment, and a modifier is added to the ladle bottom before tapping, and then molten steel is poured in, the addition amount being 0.1 to 0.5% of the treated molten steel.
7. The method for producing a high manganese steel for wear resistance based on TWIP effect and nano precipitation strengthening according to claim 6, wherein in the step (2), the modification treatment is performed by a wire feeding method, and the addition amount of the modifier is 0.05 to 0.15%.
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