CN112708823A - High-manganese and high-aluminum TWIP steel with high thermoplasticity and production method thereof - Google Patents
High-manganese and high-aluminum TWIP steel with high thermoplasticity and production method thereof Download PDFInfo
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- CN112708823A CN112708823A CN202011329885.1A CN202011329885A CN112708823A CN 112708823 A CN112708823 A CN 112708823A CN 202011329885 A CN202011329885 A CN 202011329885A CN 112708823 A CN112708823 A CN 112708823A
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
Abstract
The invention discloses a high-manganese and high-aluminum TWIP steel with high thermoplasticity and a production method thereof, wherein the TWIP steel comprises the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 1 to 3 percent of Si, 16 to 25 percent of Mn, 0.001 to 0.008 percent of P, 0.001 to 0.008 percent of S, 1 to 3 percent of Al, 0.002 to 0.009 percent of N, 0.06 to 0.1 percent of Nb and/or 0.2 to 0.4 percent of Mo, and the balance of Fe and other inevitable trace elements. The present TWIP steel adds Nb and/or Mo to the steel to improve the thermoplasticity of the steel. Therefore, the method can reduce the precipitation of aluminum nitride at the crystal boundary of the steel, improve the occurrence rate of dynamic recrystallization of the steel, obviously improve the thermoplasticity of the high-manganese and high-aluminum TWIP steel for the automobile and improve the tensile strength of the steel, thereby avoiding the problems of surface defects, cracks and the like in the hot working process.
Description
Technical Field
The invention relates to high-manganese high-aluminum TWIP steel, in particular to high-manganese high-aluminum TWIP steel with high thermoplasticity and a production method thereof.
Background
The high-manganese and high-aluminum TWIP steel is also called twin crystal induced plasticity steel, is a single austenite structure at room temperature, is an annealing twin crystal structure before deformation, generates twin crystals in the deformation process, and leads to excellent plasticity. The high-manganese and high-aluminum TWIP steel has the strength-plastic product of more than 50GPa percent, and is an ideal automobile steel integrating high strength and high plasticity. If the anti-collision material is used for manufacturing the automobile body and chassis, the weight of the automobile can be reduced by more than 20%, the oil consumption can be obviously reduced, the anti-collision safety is enhanced, and the effects of energy conservation and emission reduction are achieved. High manganese high aluminum TWIP steel is considered one of the most promising steels for research and industrial applications.
However, the relatively high manganese Mn and aluminum Al content of high manganese high aluminum TWIP steels makes them exceptionally difficult during hot working, such as the continuous casting straightening stage, forging, and hot rolling extension. Although there are many reports on improving the plasticity at normal temperature through tissue regulation, the research reports on the high-temperature thermoplasticity of the TWIP steel with high manganese and high aluminum are relatively few. The TWIP steel with poor thermoplasticity and high manganese and high aluminum has a great amount of corner, surface and internal cracks in the hot working process, so that the surface and internal quality of the steel is deteriorated, and the product quality is seriously influenced.
In the prior art, there have been very few patent applications relating to the improvement of the thermoplasticity of high manganese, high aluminum TWIP steels mentioned herein. Chinese patent application CN101412082A discloses a production method for preventing cracks of medium-carbon high-manganese steel, which aims to eliminate cracks of medium-carbon high-manganese steel bloom with strong sensitivity, and mainly adds ferrotitanium to control the Ti content in the steel to be 0.015-0.045 wt% after the Al content in the steel is controlled to be 0.010-0.050 wt% in an RH refining station; the technical problem that the medium-carbon high-manganese steel square billet produced by the continuous casting process is cracked is solved by improving the thermoplasticity of the steel. The method does not limit the content of manganese Mn in steel, and the content of manganese Mn in high-manganese high-pressure gas cylinder steel related in embodiments 1 to 3 is only 1.20 to 1.75wt%, which cannot directly guide the improvement of the thermoplasticity of high-manganese high-aluminum TWIP steel.
Chinese patent application CN107058909A discloses a method for improving the thermoplasticity of super austenitic stainless steel, which aims to improve the thermoplasticity of the super austenitic stainless steel and improve the hot working performance of steel, and belongs to the field of smelting super austenitic stainless steel in the processing field. The method comprises the steps of batching and charging, smelting, nitrogen alloying, deoxidation and desulfurization, microalloying of rare earth and boron, casting and the like, and is characterized in that the method of compositely adding boron and rare earth is adopted, the thermoplasticity of steel is obviously improved, and a super austenitic stainless steel product with high surface quality is obtained. The rare earth added in the method has extremely strong activity in the steelmaking process, low yield and poor effect stability, and the target steel is austenitic stainless steel, which can not directly guide the improvement of the thermoplasticity of the high-manganese high-aluminum TWIP steel.
Disclosure of Invention
The invention aims to solve the technical problem of providing high-manganese high-aluminum TWIP steel with stable effect and high thermoplasticity; the invention also provides a production method of the high-manganese high-aluminum TWIP steel with high thermoplasticity.
In order to solve the technical problems, the invention adopts the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 1 to 3 percent of Si, 16 to 25 percent of Mn, 0.001 to 0.008 percent of P, 0.001 to 0.008 percent of S, 1 to 3 percent of Al, 0.002 to 0.009 percent of N, 0.06 to 0.1 percent of Nb and/or 0.2 to 0.4 percent of Mo, and the balance of Fe and other inevitable trace elements.
The design concept of the invention is as follows: because the aluminum Al content in the TWIP steel is 1-3%, in the prior art, a large amount of AlN can be formed in the steel due to the high Al content; and the Mn content in the steel is higher, which directly leads to the lower liquidus temperature of the steel grade, and AlN with higher content in the steel can rapidly grow to a certain size in a liquid phase and in a cooling process. Therefore, in the prior art, AlN is enriched on austenite grain boundaries, and the occurrence of dynamic recrystallization is hindered; further, AlN aluminum nitride near the grain boundary promotes the sliding of the grain boundary, causing brittle fracture of the steel along the grain, and deteriorating the thermoplasticity of the steel.
According to the invention, Nb is added into the steel and combined with nitrogen N to form niobium nitride NbN, and aluminum nitride AlN is precipitated at the grain boundary of the high-manganese high-aluminum TWIP steel, so that the thermoplasticity of the steel is improved. By adding Mo into the steel, the occurrence rate of dynamic recrystallization of the high-manganese and high-aluminum TWIP steel can be obviously improved, thereby improving the thermoplasticity of the steel.
The method comprises the following steps: (1) preparing industrial pure iron, industrial silicon, carbon powder, electrolytic manganese, electrolytic aluminum and ferrocolumbium and/or molybdenum strips according to the element components of the target steel grade;
(2) mixing and heating the industrial pure iron, the industrial silicon, the carbon powder and the electrolytic manganese for smelting;
(3) adding electrolytic aluminum and ferrocolumbium and/or molybdenum strips into the molten materials for alloying;
(4) and casting the alloyed materials to obtain the high-manganese high-aluminum TWIP steel ingot.
In the step (2) of the method of the present invention, the melting is performed in a vacuum state.
In the step (3) of the method of the present invention, alloying is performed in an inert gas atmosphere.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention adds Nb and/or Mo into the steel so as to improve the thermoplasticity of the steel. Therefore, the invention can reduce the precipitation of aluminum nitride at the crystal boundary of the steel, improve the occurrence rate of dynamic recrystallization of the steel, and obviously improve the thermoplasticity of the high-manganese and high-aluminum TWIP steel for the automobile, thereby avoiding the problems of surface defects, cracks and the like in the hot working process.
The method of the invention improves the thermoplasticity of the steel by adding Nb and/or Mo into the steel, and can better improve the performance of the product by controlling the process, thereby obtaining the high-manganese high-aluminum TWIP steel product with high surface quality.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
The high-manganese and high-aluminum TWIP steel with high thermoplasticity adopts the following production method: (1) preparing materials: preparing industrial pure iron, industrial silicon, carbon powder, electrolytic manganese, electrolytic aluminum and ferrocolumbium and/or molybdenum strips according to the element components of the target steel grade.
The high-manganese and high-aluminum TWIP steel grade comprises the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 1 to 3 percent of Si, 16 to 25 percent of Mn, 0.001 to 0.008 percent of P, 0.001 to 0.008 percent of S, 1 to 3 percent of Al, 0.002 to 0.009 percent of N, 0.06 to 0.1 percent of Nb and/or 0.2 to 0.4 percent of Mo, and the balance of Fe and other inevitable trace elements.
(2) Smelting: putting industrial pure iron, industrial silicon, carbon powder and electrolytic manganese into a crucible of a vacuum induction furnace, vacuumizing the vacuum induction furnace to 11Pa or below, electrifying and heating up, and melting down the materials in the crucible.
(3) After the materials are melted down, introducing argon to 0.11-0.12 MPa; adding electrolytic aluminum and ferrocolumbium and/or molybdenum strips into the melted materials for alloying.
(4) And casting the alloyed materials, and cooling the steel ingot along with the furnace after the casting is finished to obtain the high-manganese high-aluminum TWIP steel ingot.
Examples 1-10 and comparative examples: the specific production process of the high-manganese and high-aluminum TWIP steel with high thermoplasticity is as follows.
(1) The smelting equipment is a 120kg vacuum induction furnace, and the charging amount is 100 kg; the process parameters for each example and comparative example are shown in table 1.
Table 1: process parameters of the examples
(2) The chemical compositions of ingots of TWIP steel obtained in each example and comparative example are shown in table 2.
Table 2: chemical composition (wt%) of TWIP steel obtained in each example
(3) A high-temperature tensile sample is taken from the TWIP steel ingot obtained in each embodiment, a Gleeble-3800 model thermal simulation testing machine is adopted to measure the high-temperature mechanical property at 700-1200 ℃, and the reduction of area is taken as an index for evaluating thermoplasticity. Table 3 shows the reduction of area index of the TWIP steel ingots at 700-1200 ℃ in each example and comparative example.
Table 3: the area shrinkage rate of the TWIP steel ingot obtained in each example and each comparative example is 700-1200 DEG C
The comparative examples in table 3 are TWIP steels without niobium Nb and molybdenum Mo additions.
As can be seen from Table 3, the thermoplasticity of the steel at 700-1200 ℃ is remarkably improved after the addition of the niobium Nb and/or the molybdenum Mo into the TWIP steel, while the thermoplasticity of the steel at 700-1200 ℃ is poor because the Nb and the molybdenum Mo are not added in the comparative example.
Claims (4)
1. The high-manganese and high-aluminum TWIP steel with high thermoplasticity is characterized by comprising the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 1 to 3 percent of Si, 16 to 25 percent of Mn, 0.001 to 0.008 percent of P, 0.001 to 0.008 percent of S, 1 to 3 percent of Al, 0.002 to 0.009 percent of N, 0.06 to 0.1 percent of Nb and/or 0.2 to 0.4 percent of Mo, and the balance of Fe and other inevitable trace elements.
2. A method for producing a high-manganese, high-aluminum TWIP steel of high thermoplasticity according to claim 1, characterized by the steps of: (1) preparing industrial pure iron, industrial silicon, carbon powder, electrolytic manganese, electrolytic aluminum and ferrocolumbium and/or molybdenum strips according to the element components of the target steel grade;
(2) mixing and heating the industrial pure iron, the industrial silicon, the carbon powder and the electrolytic manganese for smelting;
(3) adding electrolytic aluminum and ferrocolumbium and/or molybdenum strips into the molten materials for alloying;
(4) and casting the alloyed materials to obtain the high-manganese high-aluminum TWIP steel ingot.
3. A method of producing a high-manganese, high-aluminum TWIP steel of high thermoplasticity according to claim 2, characterized in that: in the step (2), the melting is performed in a vacuum state.
4. A method for producing a high-manganese high-aluminum TWIP steel of high thermoplasticity according to claim 2 or 3, characterized in that: in the step (3), alloying is performed in an inert gas atmosphere.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011329885.1A CN112708823A (en) | 2020-11-24 | 2020-11-24 | High-manganese and high-aluminum TWIP steel with high thermoplasticity and production method thereof |
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| CN202011329885.1A CN112708823A (en) | 2020-11-24 | 2020-11-24 | High-manganese and high-aluminum TWIP steel with high thermoplasticity and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000062A (en) * | 2021-11-05 | 2022-02-01 | 贵州大学 | Low-temperature-resistant high-toughness structural steel treated by trace rare earth and preparation method thereof |
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| CN102439188A (en) * | 2009-04-28 | 2012-05-02 | 现代制铁株式会社 | High manganese nitrogen-containing steel sheet having high strength and high ductility, and method for manufacturing same |
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| CN109154046A (en) * | 2016-05-24 | 2019-01-04 | 安赛乐米塔尔公司 | TWIP steel plate with austenitic matrix |
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2020
- 2020-11-24 CN CN202011329885.1A patent/CN112708823A/en active Pending
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| CN102439188A (en) * | 2009-04-28 | 2012-05-02 | 现代制铁株式会社 | High manganese nitrogen-containing steel sheet having high strength and high ductility, and method for manufacturing same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114000062A (en) * | 2021-11-05 | 2022-02-01 | 贵州大学 | Low-temperature-resistant high-toughness structural steel treated by trace rare earth and preparation method thereof |
| CN114000062B (en) * | 2021-11-05 | 2023-09-22 | 贵州大学 | Low-temperature-resistant high-toughness structural steel treated by trace rare earth and preparation method thereof |
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Application publication date: 20210427 |