CN109852892B - Hot-rolled medium manganese TRIP steel containing trace zirconium and preparation method thereof - Google Patents
Hot-rolled medium manganese TRIP steel containing trace zirconium and preparation method thereof Download PDFInfo
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- 229910000794 TRIP steel Inorganic materials 0.000 title claims abstract description 44
- 239000011572 manganese Substances 0.000 title claims abstract description 39
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 38
- 229910052726 zirconium Inorganic materials 0.000 title claims abstract description 26
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 25
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
- 238000005242 forging Methods 0.000 claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 13
- 229910001566 austenite Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims 1
- 238000004321 preservation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 238000009749 continuous casting Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 8
- 229910000937 TWIP steel Inorganic materials 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000001887 electron backscatter diffraction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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Abstract
The invention discloses a hot-rolled medium manganese TRIP steel containing trace zirconium and a preparation method thereof, wherein the hot-rolled medium manganese TRIP steel comprises the following chemical components: c: 0.18 to 0.2 percent of Mn, 7 to 9 percent of Mn, 1.40 to 1.6 percent of Al, 0.06 to 0.11 percent of Zr, less than 0.008 percent of P, less than 0.008 percent of S, and the balance of Fe. The preparation method comprises the following steps: smelting and forging, hot rolling, two-phase region annealing and low-temperature tempering. The invention has the advantages that: the tensile strength of the TRIP steel can reach 1250MPa, the elongation rate is up to 50 percent, the product of strength and elongation reaches 63GP ·%, the strength of the TRIP steel is far higher than the TWIP level for second-generation automobiles, and the product of strength and elongation reaches the same level; 2. the steel plate has simple components, wherein the contents of C and Al are lower, the welding performance of the steel plate is excellent, and the problems that a water gap is easy to block in the pouring process, the continuous casting production is not facilitated and the like are effectively avoided due to the lower Al content; 3. the production process is simple, high-strength and high-plasticity performance can be obtained by short-time annealing and low-temperature tempering in a two-phase region after hot rolling, and the method is easy to realize in industrial production.
Description
Technical Field
The invention relates to the technical field of advanced high-strength steel production, in particular to hot-rolled medium manganese TRIP steel containing trace zirconium and a preparation method thereof.
Background
Safety, energy conservation and environmental protection are taken as three major subjects of automobile technology nowadays, and research and development of the automobile body light weight technology are greatly promoted. The first generation of steel for automobiles, such as IF steel, DP steel, TRIP steel and martensitic steel, has a low product of strength and elongation (product of tensile strength and total elongation), and cannot meet the development requirements of high strength, high plasticity and high safety performance of the future steel for automobiles; therefore, the second generation automobile steel mainly based on the TWIP steel is developed, the plasticity is excellent, the product of strength and elongation is as high as 50-70 GPa%, but the TWIP steel matrix structure is austenite, the strength is generally below 1000MPa, and the application is limited due to the cost rise and poor process performance caused by high alloy content; therefore, Speer, an american scholars, first proposed the concept of the third generation advanced high-strength steel, and then, the research work of the third generation advanced high-strength steel was sequentially started in countries such as japan, de, and korea. Compared with TWIP steel, medium manganese TRIP steel (with a manganese content of 4-12%) has a greatly reduced cost and has high strength and plasticity (with a product of 30-45GPa ·%) as one of typical representatives of third-generation automotive steel, and gradually draws attention from academia, steel industry and automobile manufacturers. Therefore, in recent years, researchers develop a great deal of beneficial research aiming at the composition design, the tissue regulation and the performance research of the medium manganese steel, and important achievements are achieved. However, according to research and study of literature, the strengthening product of medium manganese TRIP steel is still far from the TWIP steel for the second generation automobile, especially, the plasticity of the medium manganese TRIP steel is lower than that of the TWIP steel as the strength is improved, which seriously hinders the progress of further lightening the automobile, so that the development of a novel medium manganese TRIP steel with high strength and high plasticity is urgent.
In order to further improve the strength-product of medium manganese TRIP steel, researchers at home and abroad develop beneficial research, for example, the invention patent with application number 201610592858.0 in Chinese patent document discloses that the strength-product of medium manganese steel can reach 35-65 GPa% level through hot rolling, annealing, acid pickling, cold rolling and continuous annealing processes of a medium manganese steel with a component system of 0.3-0.5 wt% C +8-12 wt% Mn +1.8-3.5 wt% Al +0.25-0.7 wt% V. The invention patent with the application number of 201811049467.X discloses 0.35 wt% C +4.5-5.5 wt% Mn +3.2 wt% Al medium manganese steel, which is subjected to smelting, forging, hot rolling, cold rolling, two-phase region annealing and low-temperature tempering, wherein the tensile strength of the steel reaches 1118MPa, and the total elongation of the steel reaches 67%. The invention patent with application number 201610455155.3 discloses that after the medium manganese steel with 0.25-0.35 wt% of C +7.0-9.5 wt% of Mn +2-2.9 wt% of Al is subjected to hot rolling, annealing, pickling, cold rolling and two-phase zone annealing, the final tensile strength is 900-1300MPa, the elongation is 50-80%, and the product of strength and elongation can be improved to more than 60 GPa%. In addition, Chua Shi Shih Shihui develops 11% Mn-0.18% C-4% Al and S.S. Sohn develops 8.5% Mn-0.3% C-5.6% Al and the like medium manganese steel product of strength and elongation can reach the level of 55 GP. In summary, at present, the researchers mainly improve the contents of C and Al in the steel and match with a certain heat treatment process to realize the good matching of the strength and the plasticity of the medium manganese steel, wherein the increase of the content of C not only improves the strength, but also improves the content and the stability of austenite in the steel because C is an austenite beneficial element. The main function of adding higher Al element in the steel is to improve the plasticity of the steel and inhibit the precipitation of cementite to a certain extent, thereby obtaining higher austenite content.
From the above prior art it is seen that although medium manganese steels can achieve good strength and plasticity by increasing the C and Al content, even to the strength product level of TWIP steels. However, the welding performance of the steel plate is deteriorated due to the high C content, and the addition of high Al causes the medium manganese steel to easily block a water gap in the pouring process, is not beneficial to continuous casting production, and increases the cost, thereby limiting the application and popularization of the steel.
Abbreviations and Key term definitions
TRIP steel: transformation induced plasticity steel;
TWIP steel: twinning induced plasticity steel;
IF steel: interstitial free steel;
DP steel: dual-phase steel;
EBSD: electron back-scattered diffraction;
XRD: x-ray diffraction;
TEM: and (4) a transmission electron microscope.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the hot-rolled medium manganese TRIP steel containing trace zirconium and the preparation method thereof, and can effectively solve the problems in the prior art.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the hot-rolled medium manganese TRIP steel containing trace zirconium comprises the following chemical components in percentage by weight: c: 0.18 to 0.2 percent of Mn, 7 to 9 percent of Mn, 1.40 to 1.6 percent of Al, 0.06 to 0.11 percent of Zr, less than 0.008 percent of P, less than 0.008 percent of S, and the balance of Fe.
Preferably, the chemical components are: c: 0.18%, Mn 7.89%, Al 1.51%, Zr 0.11%, P <0.008%, S <0.008%, and the balance Fe.
The invention also discloses a preparation method of the TRIP steel, which comprises the following steps:
Step 2, hot rolling: heating the forging stock to 1200 ℃, preserving the temperature for 2h, then carrying out multi-pass rolling to the thickness of 4-5mm, wherein the final rolling temperature is not lower than 850 ℃.
Step 3, annealing in a two-phase region: and annealing the hot rolled steel plate at 660-680 ℃ for 1h, and then air-cooling to room temperature.
And 4, low-temperature tempering: annealing the hot rolled steel plate at 190-220 ℃ for 20min, and then air-cooling to room temperature.
Preferably, the thickness is rolled to 4mm in step 2; the annealing temperature in the step 3 is 680 ℃; the tempering temperature in step 4 was 200 ℃.
Compared with the prior art, the invention has the advantages that:
1. the tensile strength of the hot-rolled medium manganese TRIP steel containing trace zirconium can reach 1250MPa, the elongation rate is up to 50%, the product of strength and elongation reaches the level of 63GP ·%, the strength of the hot-rolled medium manganese TRIP steel is far higher than the TWIP level of a second-generation automobile, and the product of strength and elongation reaches the same level;
2. the steel plate has simple components, wherein the contents of C and Al are lower, the welding performance of the steel plate is excellent, and the problems that a water gap is easy to block in the pouring process, the continuous casting production is not facilitated and the like are effectively avoided due to the lower Al content;
3. the production process is simple, high-strength and high-plasticity performance can be obtained by short-time annealing and low-temperature tempering in a two-phase region after hot rolling, and the method is easy to realize in industrial production.
Drawings
FIG. 1 is a TRIP steel mechanical property graph according to example 1 of the present invention;
FIG. 2 is an EBSD microstructure of TRIP steel in example 1 of the present invention;
FIG. 3 is an XRD (X-ray diffraction) detection result diagram of the austenite content of the TRIP steel in example 1 of the invention;
FIG. 4 is a microscopic TEM topography of TRIP steel of example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples.
Example 1
The hot-rolled medium manganese TRIP steel containing trace zirconium comprises the following chemical components in percentage by weight: c: 0.18%, Mn 7.89%, Al 1.51%, Zr 0.11%, P <0.008%, S <0.008%, and the balance Fe.
The preparation method of the TRIP steel comprises the following steps:
smelting and forging: and (4) smelting the alloy components in vacuum to prepare a steel ingot, removing a riser and turning to remove oxide skin. And (3) keeping the temperature of the steel ingot at 1200 ℃ for 2h, then forging the steel ingot, wherein the final forging temperature is not lower than 900 ℃, then air-cooling the steel ingot to room temperature, and finally forging the steel ingot into a slab sample, wherein the thickness of the slab is 30 mm.
Hot rolling: heating the forging stock to 1200 ℃, preserving the temperature for 2h, and then performing multi-pass rolling to the thickness of 4mm, wherein the final rolling temperature is not lower than 850 ℃.
And (3) annealing the two-phase region: and annealing the hot rolled steel plate at 680 ℃ for 1h, and then air-cooling to room temperature.
Low-temperature tempering: annealing the hot rolled steel plate at 200 ℃ for 20min, and then air-cooling to room temperature.
Example 2
The hot-rolled medium manganese TRIP steel containing trace zirconium comprises the following chemical components in percentage by weight: c: 0.18 percent, 8.1 percent of Mn, 1.47 percent of Al, 0.08 percent of Zr, less than 0.008 percent of P, less than 0.008 percent of S and the balance of Fe.
The preparation method of the TRIP steel comprises the following steps:
smelting and forging: and (4) smelting the alloy components in vacuum to prepare a steel ingot, removing a riser and turning to remove oxide skin. And (3) keeping the temperature of the steel ingot at 1200 ℃ for 2h, then forging the steel ingot, wherein the final forging temperature is not lower than 900 ℃, then air-cooling the steel ingot to room temperature, and finally forging the steel ingot into a slab sample, wherein the thickness of the slab is 30 mm.
Hot rolling: heating the forging stock to 1200 ℃, preserving the temperature for 2h, and then performing multi-pass rolling to the thickness of 4mm, wherein the final rolling temperature is not lower than 850 ℃.
And (3) annealing the two-phase region: the hot rolled steel sheet was annealed at 660 ℃ for 1 hour and then air-cooled to room temperature.
Low-temperature tempering: annealing the hot rolled steel plate at 210 ℃ for 20min, and then air-cooling to room temperature.
Example 3
The hot-rolled medium manganese TRIP steel containing trace zirconium comprises the following chemical components in percentage by weight: c: 0.2%, Mn 7.91%, Al 1.51%, Zr 0.06%, P <0.008%, S <0.008%, and the balance Fe.
The preparation method of the TRIP steel comprises the following steps:
smelting and forging: and (4) smelting the alloy components in vacuum to prepare a steel ingot, removing a riser and turning to remove oxide skin. And (3) keeping the temperature of the steel ingot at 1200 ℃ for 2h, then forging the steel ingot, wherein the final forging temperature is not lower than 900 ℃, then air-cooling the steel ingot to room temperature, and finally forging the steel ingot into a slab sample, wherein the thickness of the slab is 30 mm.
Hot rolling: heating the forging stock to 1200 ℃, preserving the temperature for 2h, and then performing multi-pass rolling to the thickness of 5mm, wherein the final rolling temperature is not lower than 850 ℃.
And (3) annealing the two-phase region: the hot rolled steel sheet was annealed at 670 ℃ for 1 hour and then air-cooled to room temperature.
Low-temperature tempering: annealing the hot rolled steel plate at 190 ℃ for 20min, and then air-cooling to room temperature.
Example 4
As a comparative example, a hot-rolled medium manganese TRIP steel (the composition of which is the same as that of example 1, and is as follows, as heat treatment process) containing no zirconium had the following chemical composition in percentage by weight: c: 0.18 percent, 7.99 percent of Mn, 1.57 percent of Al, less than 0.008 percent of P, less than 0.008 percent of S and the balance of Fe.
The preparation method of the TRIP steel comprises the following steps:
smelting and forging: and (4) smelting the alloy components in vacuum to prepare a steel ingot, removing a riser and turning to remove oxide skin. And (3) keeping the temperature of the steel ingot at 1200 ℃ for 2h, then forging the steel ingot, wherein the final forging temperature is not lower than 900 ℃, then air-cooling the steel ingot to room temperature, and finally forging the steel ingot into a slab sample, wherein the thickness of the slab is 30 mm.
Hot rolling: heating the forging stock to 1200 ℃, preserving the temperature for 2h, and then performing multi-pass rolling to the thickness of 4mm, wherein the final rolling temperature is not lower than 850 ℃.
And (3) annealing the two-phase region: and annealing the hot rolled steel plate at 680 ℃ for 1h, and then air-cooling to room temperature.
Low-temperature tempering: annealing the hot rolled steel plate at 200 ℃ for 20min, and then air-cooling to room temperature.
Table 1 shows the mechanical properties of the TRIP steels of examples 1 to 4 after rolling, annealing and tempering;
TABLE 1
As can be seen from table 1, the tensile strengths of the TRIP steels obtained in examples 1 to 4 all exceed 1200MPa, and the medium manganese TRIP steels with trace zirconium added thereto all have good matching between strength and plasticity, and the products of strength and plasticity thereof all exceed 55GPa ·%, in particular, the products of strength and plasticity of the TRIP steels in example 1 reach TWIP grade, while the tensile strength of the TRIP steel in example 4 without zirconium added thereto is higher, and reaches 1304MPa, but the total elongation is much lower than that of the three steel types with trace zirconium added thereto. Fig. 1 is a mechanical property curve of the TRIP steel of example 1, fig. 2 is an EBSD microstructure morphology (white is austenite and black gray is ferrite) of the TRIP steel of example 1, fig. 3 is an XRD detection result of the austenite content of the TRIP steel of example 1, which is tested to have an austenite content of 36.1%, fig. 4 is a micro TEM morphology of the TRIP steel of example 1, and the upper right corner is an austenite diffraction spot, which has a structure mainly composed of austenite and ferrite in the form of an ultra-fine lath. The medium manganese TRIP steel added with trace zirconium element can provide reference for the research and development and application of third-generation automobile steel plates.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (3)
1. A hot-rolled medium manganese TRIP steel containing trace zirconium is characterized in that: the TRIP steel comprises the following chemical components in percentage by weight: c: 0.18-0.2%, Mn 7-9%, Al 1.4-1.6%, Zr 0.06-0.11%, P <0.008%, S <0.008%, and the balance Fe;
the TRIP steel is composed of austenite and ferrite in the shape of ultra-fine crystal lath, and the product of strength and elongation of the TRIP steel exceeds 55 GPa.
2. The hot-rolled medium manganese TRIP steel containing trace amounts of zirconium according to claim 1, characterized by the chemical composition: c: 0.18%, Mn 7.89%, Al 1.51%, Zr 0.11%, P <0.008%, S <0.008%, and the balance Fe.
3. The method for producing a hot-rolled medium manganese TRIP steel containing trace amounts of zirconium according to claim 1 or 2, characterized by comprising the steps of:
step 1, smelting and forging: according to alloy components, vacuum smelting is carried out to prepare a steel ingot, a riser is removed, and an oxide skin is turned off; the steel ingot is forged after heat preservation is carried out for 2h at 1200 ℃, the final forging temperature is not lower than 900 ℃, then air cooling is carried out to the room temperature, and finally a slab sample is forged, wherein the thickness of the slab is 30 mm;
step 2, hot rolling: heating the forging stock to 1200 ℃, preserving the temperature for 2h, and then performing multi-pass rolling to the thickness of 4mm, wherein the final rolling temperature is not lower than 850 ℃;
step 3, annealing in a two-phase region: annealing the hot-rolled steel plate at 680 ℃ for 1h, and then air-cooling to room temperature;
and 4, low-temperature tempering: annealing the hot rolled steel plate at 200 ℃ for 20min, and then air-cooling to room temperature.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001073040A (en) * | 1999-07-30 | 2001-03-21 | Usinor | Production of thin strip-form trip steel and thin strip obtained thereby |
| CN101942600A (en) * | 2010-09-15 | 2011-01-12 | 北京科技大学 | Preparation method of transformation-induced plasticity (TRIP) medium-manganese hot-rolled steel sheet |
| WO2018050387A1 (en) * | 2016-09-16 | 2018-03-22 | Salzgitter Flachstahl Gmbh | Method for producing a re-shaped component from a manganese-containing flat steel product and such a component |
| CN108998741A (en) * | 2018-05-29 | 2018-12-14 | 西南交通大学 | Manganese phase change induction plasticity steel and preparation method thereof in ultra-high strength and toughness |
| CN109082590A (en) * | 2018-08-23 | 2018-12-25 | 东北大学 | A kind of high-strength plasticity hot rolling medium managese steel plate and its critical zone roll preparation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015112889A1 (en) * | 2015-08-05 | 2017-02-09 | Salzgitter Flachstahl Gmbh | High-strength manganese-containing steel, use of the steel for flexibly rolled flat steel products and production methods together with flat steel product for this purpose |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001073040A (en) * | 1999-07-30 | 2001-03-21 | Usinor | Production of thin strip-form trip steel and thin strip obtained thereby |
| CN101942600A (en) * | 2010-09-15 | 2011-01-12 | 北京科技大学 | Preparation method of transformation-induced plasticity (TRIP) medium-manganese hot-rolled steel sheet |
| WO2018050387A1 (en) * | 2016-09-16 | 2018-03-22 | Salzgitter Flachstahl Gmbh | Method for producing a re-shaped component from a manganese-containing flat steel product and such a component |
| CN108998741A (en) * | 2018-05-29 | 2018-12-14 | 西南交通大学 | Manganese phase change induction plasticity steel and preparation method thereof in ultra-high strength and toughness |
| CN109082590A (en) * | 2018-08-23 | 2018-12-25 | 东北大学 | A kind of high-strength plasticity hot rolling medium managese steel plate and its critical zone roll preparation method |
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