CN110218948A - A kind of low-density high tenacity steel and preparation method thereof - Google Patents
A kind of low-density high tenacity steel and preparation method thereof Download PDFInfo
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- CN110218948A CN110218948A CN201910565966.2A CN201910565966A CN110218948A CN 110218948 A CN110218948 A CN 110218948A CN 201910565966 A CN201910565966 A CN 201910565966A CN 110218948 A CN110218948 A CN 110218948A
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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
- 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
- C21D8/0263—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
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
The present invention provides a kind of low-density high tenacity steel and preparation method thereof, wherein, the chemical component of low-density high tenacity steel is by mass percentage are as follows: Mn:12%~25%, Al:5%~13%, C:0.4%~2%, Cr:0.6%~1.5%, V:0.1%~0.5%, W:0.1~0.5%, Y:0.05%~0.2%, surplus are inevitable other impurity elements in Fe and smelting process.Xiang Gangzhong adds a certain amount of Y element and W element, on the basis of alloying component and moulding process regulate and control, obtains having high-intensitive and good plasticity low density steel, the weight for mitigating steel simultaneously so that steel have higher-strength and good plasticity.
Description
[technical field]
The present invention relates to low-density alloy rings domains more particularly to a kind of low-density high tenacity steel and preparation method thereof.
[background technique]
Under protection environment, the main trend of energy-saving and emission-reduction, automobile fuel ecomomy must be just improved to reduce carbon emission, from
And urgent demand is proposed to automotive light weight technology.For automobile manufacturing company, the most effective approach of lightweight is then answered
It is realized with three kinds of new material, new process and structure optimization approach.Therefore, in recent years low-density high tenacity steel in automobile manufacture
It is widely used in industry.
Currently, low-density high tenacity composition of steel system mainly uses Fe-Mn-Al-C series high-manganese steel, and further add aluminium,
The light-alloys such as silicon member usually reduces its density.But when the Al constituent content added in steel is higher, it will lead to the toughness of steel sharply
Decline, it is difficult to meet requirement of the automotive field to steel toughness.
Published (CN104711494B) provides a kind of low-density high-ductility NiAl enhancing unimach, mainly
NiAl is formed to improve the tensile strength of steel by addition Ni element, which reaches 1350MPa or more, but because it adds
The Ni element for having added 5-15%, causes cost to greatly improve.
Published (CN106399858A) provides a kind of low-density Ti3Al enhancing unimach and its preparation side
Method, mainly usually forming Ti3Al intermetallic compound by addition Ti member improves tensile strength, but firmly crisp second is met
Reduce the plasticity of high-strength steel.Accordingly, it is desirable to provide one kind is while having superhigh intensity, moreover it is possible to guarantee the low-density of plasticity
Fe-Mn-Al-C system steel.
[summary of the invention]
Between the above problem, the purpose of the present invention is to provide a kind of low-density high tenacity steel and preparation method thereof, pass through
Xiang Gangzhong adds a certain amount of Y element and W element, on the basis of alloying component and moulding process regulate and control, obtains having high-strength
Degree and good plasticity low density steel, mitigate steel weight simultaneously so that steel have higher-strength and good plasticity.
To achieve the goals above, the present invention provides a kind of low-density high tenacity steel, and chemical component is by mass percentage
Are as follows: Mn:12%~25%, Al:5%~13%, C:0.4%~2%, Cr:0.6%~1.5%, V:0.1%~0.5%, W:
0.1~0.5%, Y:0.05%~0.2%, surplus are inevitable other impurity elements in Fe and smelting process.
Optionally, the density of the low-density high tenacity steel is lower than 7.4g/cm3, weight-loss ratio is greater than 6.7%.
Optionally, the yield strength of the low-density high tenacity steel is greater than 730MPa, and tensile strength is greater than 900MPa, has no progeny
Elongation is greater than 45%, and strength and ductility product is greater than 40.5GPa%.
To achieve the goals above, the present invention also provides a kind of preparation methods of low-density high tenacity steel, including following step
It is rapid:
(1) using pure metal or intermediate alloy as raw material, ingredient is carried out according to above-mentioned chemical component；
(2) ingredient is put into smelting furnace to smelt, slab is made, and the slab is forged into slab；
(3) slab is subjected to Homogenization Treatments, heats the slab to 1140~1200 DEG C, keeps the temperature 3~4 hours；
(4) slab after heat preservation is subjected to multistage hot deformation in duo mill, obtains steel plate；
(5) solution treatment is carried out to the steel plate after hot rolling, obtains low-density high tenacity steel.
As the further improvement of preparation method technical solution of the present invention, the open rolling of multistage hot deformation described in step (4)
1020~1080 DEG C of temperature, 860~910 DEG C of finishing temperature, the slab is deformed through multi- pass rolling, then is air-cooled to room temperature.
As the further improvement of preparation method technical solution of the present invention, the accumulative change of the steel plate after multistage hot deformation
Shape amount is 82%~87%.
As the further improvement of preparation method technical solution of the present invention, the step of solution treatment described in step (5), packet
It includes: the steel plate after hot rolling is heated to 1000~1050 DEG C, direct-water-quenching is to room temperature after heat preservation 0.5~1 hour.
Compared with prior art, preparation method provided by the invention has following features and the utility model has the advantages that using Hot-roller
Skill is combined with solution treatment, and without carrying out cold-rolling process, production process is short, is conducive to industrialized popularization；In solution treatment
Wolfram element effectively pin is in grain boundaries afterwards, to increase dislocation movement by slip difficulty, improves the intensity of steel.The high-melting-point yttrium member of addition
Element effectively controls intermetallic compound and negatively affects to material plasticity bring, meets automobile industry to steel of new generation
Performance requirement.
Each chemical element function analysis in low-density high tenacity steel provided by the invention is as follows:
Mn: manganese is the main alloy element of Fe-Mn-Al-C system low density steel, and manganese, can be with to stable austenite tissue element
Expand austenite phase field, improve the stability of austenite, plays solution strengthening effect.Steel plate plasticity is improved, Mn element also affects
The stacking fault energy of Fe-Mn-Al-C system low density steel can make steel generate fine and close twin by external force and when deformation, it will be apparent that mention
The elongation percentage of the high series low density steel.Mn content of the invention is 12%~25%.
Al: aluminium is lightweight element important in steel, can be substantially reduced density of material, research shows that Al content is lower than
It is not in that k system carbide occurs, wherein k system carbide refers to steel austenite base after quenching or heat treatment when 4.5%
Equally distributed Nano-Scaled Carbide on body and crystal boundary, due to these carbide spacing very littles, in orderly perovskite structure,
The intensity and hardness of matrix can be effectively improved.But excessively high Al content will change austenite one phase tissue, promote ferrite
The formation of phase；Therefore the mass percent of Al is controlled in 5%-13%, is remarkably improved the Deformation Resistance of steel；Delay dynamic
Recrystallization, refines austenite grain after dynamic recrystallization.
C: carbon is austenite formation and stabilizing element, solution strengthening effect is played, in the work of Fe-Mn-Al-C low density steel
With mainly and Al is collectively formed k system carbide, promote to form single phase austenite, therefore, the stability of austenite is with austenite
In phosphorus content increase and increase.Meanwhile the increase of C content helps to reduce the density of steel.But in low-density high tenacity steel
Phosphorus content cannot be excessively high, component segregation when otherwise will cause casting leads to Carbide Precipitation, to reduce its elongation percentage.Together
When carbon content also will affect welding performance and weld metal zone metal structure performance, be mainly manifested in intensity and hardness, weld metal
Plasticity, toughness can decline with the raising of its intensity and hardness.Carbon content of the invention is 0.4%~2%.
Cr: cadmium element is added in steel to the antioxidation that can significantly improve steel, increases the resistance to corrosion of steel.Chromium can be shown
The harden ability for increasing steel is write, but also can increase steel belt roof bolt brittleness tendency.But Cr is also carbide, works as Fe-
C content reaches 1.0% or so in Mn-Al-C low density steel, and excessively high Cr content will form coarse carbide, not only reduces modeling
Property, and due to consuming a large amount of C, it can seriously reduce alloy strength.Cadmium content of the invention is 0.6%~1.5%.
V: vanadium is added in steel to the welding performance that can improve common low carbon low-alloy steel significantly.Cadmium of the invention contains
Amount is 0.1%~0.5%.
W: tungsten is high-melting point alloy element, after solution treatment wolfram element can effectively pin in grain boundaries, to increase
Dislocation movement by slip difficulty improves armor plate strength.Cadmium content of the invention is 0.1%~0.5%.
Y: yttrium is class rare earth element, and a small amount of yttrium is added in smelting process, the crystal grain of steel plate can be made in class rare earth element
Under the action of effectively refined, to improve the plasticity of steel, and yttrium is class rare earth element, and cost is lower than rare earth
Member can effectively control cost.Cadmium content of the invention is 0.05%~0.2%.
Low-density high tenacity steel of the invention, has at least the following advantages:
1) addition of micro Y can be such that the crystal grain of steel plate is effectively refined under the action of class rare earth element, to improve
The plasticity of steel, and can be effectively controlled cost；
2) after solution treatment W element can effectively pin in grain boundaries, to increase dislocation movement by slip difficulty, to improve steel
Plate intensity；
3) simple production process, comprehensive mechanical property is excellent, using hot rolling+solution treatment scheme, without carrying out Cold-roller
Skill, production process are short.
4) second-phase strength of Fe-Mn-Al-C series high-manganese steel is compared, refractory metal element is added in the present invention, can have
Effect control intermetallic compound negatively affects material plasticity bring.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field
For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the flow chart of the preparation method of low-density high tenacity steel provided by the embodiment of the present invention；
Fig. 2 is the SEM photograph of low-density high tenacity steel provided by the embodiment of the present invention 1；
Fig. 3 is the SEM photograph of low-density high tenacity steel provided by the embodiment of the present invention 2；
Fig. 4 is the SEM photograph of low-density high tenacity steel provided by the embodiment of the present invention 3；
Fig. 5 is the SEM photograph of low-density high tenacity steel provided by the embodiment of the present invention 4.
[specific embodiment]
It is clear in order to be more clear the purpose of the present invention, technical solution and advantageous effects, below in conjunction with attached drawing and
Specific embodiment, the present invention will be described in further detail.It should be understood that specific implementation described in this specification
Mode is not intended to limit the present invention just for the sake of explaining the present invention.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical；Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention；Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
The present invention provides a kind of low-density high tenacity steel, and chemical component is by mass percentage are as follows: Mn:12%~25%,
Al:5%~13%, C:0.4%~2%, Cr:0.6%~1.5%, V:0.1%~0.5%, W:0.1~0.5%, Y:
0.05%~0.2%, surplus is inevitable other impurity elements in Fe and smelting process.
The density of low-density high tenacity steel is lower than 7.4g/cm3, weight-loss ratio is greater than 6.7%.The surrender of low-density high tenacity steel
Intensity is greater than 730MPa, and tensile strength is greater than 900MPa, and elongation after fracture is greater than 45%, and strength and ductility product is greater than 40.5GPa%.
Embodiment 1
(1) according to mass percent shown in table 1: Mn:13%, Al:7%, C:0.52%, Cr:0.67%, V:0.1%,
W:0.15%, Y:0.05%, surplus be Fe and inevitable impurity, weigh the pure metal containing the above ingredient and its content or
Intermediate alloy is raw material, carries out ingredient.In the present embodiment, tungsten powder and yttrium powder are selected.
(2) ingredient is put into smelting furnace to smelt, slab is made, and the slab is forged into slab.
Specifically, ingredient is fitted into vacuum induction smelting furnace, rear power transmission heating is vacuumized, until ingredient is completely melt and melts
After pool surface bubble-free is overflowed, abundant deoxidation simultaneously carries out alloying under protection of argon gas, and then casting obtains slab.In other realities
It applies in mode, re melting process can also be carried out.
In the present embodiment, slab is forged into the slab of 20mm or so, is air-cooled to room temperature.Slab is eliminated in forging process
In component segregation, removal shrinkage cavity, it is loose the defects of.
(3) slab is subjected to Homogenization Treatments, heats slab to 1160 DEG C, keeps the temperature 3 hours.
(4) slab after heat preservation is subjected to multistage hot deformation in duo mill, obtains steel plate.In the present embodiment, hot rolling
Passage is 7 times, and 1070 DEG C of hot rolling start rolling temperature, 870 DEG C of finishing temperature, the steel plate thickness after hot rolling is about 4mm, by multi-pass
The accumulative deflection of steel plate after hot rolling is 85%.
(5) solution treatment is carried out to the steel plate after hot rolling, obtains low-density high tenacity steel.In the present embodiment, using fast
Steel plate after hot rolling is heated to 1040 DEG C by fast heating, and direct-water-quenching obtains low-density high tenacity to room temperature after heat preservation 1 hour
Steel, metallographic structure are as shown in Figure 2.
Mechanics properties testing is carried out to finished product low-density high tenacity steel and obtains that the results are shown in Table 2.
Embodiment 2:
(1) according to mass percent shown in table 1: Mn:13%, Al:8%, C:0.6%, Cr:0.7%, V:0.15%,
W:0.1%, Y:0.06%, surplus be Fe and inevitable impurity, weigh the pure metal containing the above ingredient and its content or
Intermediate alloy is raw material, carries out ingredient.In the present embodiment, tungsten powder and yttrium powder are selected.
(2) ingredient is put into smelting furnace to smelt, slab is made, and the slab is forged into slab.
Specifically, ingredient is fitted into vacuum induction smelting furnace, rear power transmission heating is vacuumized, until ingredient is completely melt and melts
After pool surface bubble-free is overflowed, abundant deoxidation simultaneously carries out alloying under protection of argon gas, and then casting obtains slab.
In the present embodiment, slab is forged into the slab of 20mm or so, is air-cooled to room temperature.Slab is eliminated in forging process
In component segregation, removal shrinkage cavity, it is loose the defects of.
(3) slab is subjected to Homogenization Treatments, heats slab to 1140 DEG C, keeps the temperature 4 hours.
(4) slab after heat preservation is subjected to multistage hot deformation in duo mill, obtains steel plate.In the present embodiment, hot rolling
Passage is 7 times, and 1080 DEG C of hot rolling start rolling temperature, 910 DEG C of finishing temperature, the steel plate thickness after hot rolling is about 4mm, by multi-pass
The accumulative deflection of steel plate after hot rolling is 82%.
(5) solution treatment is carried out to the steel plate after hot rolling, obtains low-density high tenacity steel.In the present embodiment, using fast
Steel plate after hot rolling is heated to 1050 DEG C by fast heating, and direct-water-quenching obtains low-density high-ductility to room temperature after heat preservation 0.5 hour
Steel is spent, metallographic structure is as shown in Figure 3.
Mechanics properties testing is carried out to finished product low-density high tenacity and obtains that the results are shown in Table 2.
Embodiment 3:
(1) according to mass percent shown in table 1: Mn:14.5%, Al:12%, C:0.7%, Cr:0.8%, V:
0.3%, W:0.2%, Y:0.08%, surplus are Fe and inevitable impurity, are weighed pure containing the above ingredient and its content
Metal or intermediate alloy are raw material, carry out ingredient.In the present embodiment, tungsten powder and yttrium powder are selected.
(2) ingredient is put into smelting furnace to smelt, slab is made, and the slab is forged into slab.
Specifically, ingredient is fitted into vacuum induction smelting furnace, rear power transmission heating is vacuumized, until ingredient is completely melt and melts
After pool surface bubble-free is overflowed, abundant deoxidation simultaneously carries out alloying under protection of argon gas, and then casting obtains slab.
In the present embodiment, slab is forged into the slab of 20mm or so, is air-cooled to room temperature.Slab is eliminated in forging process
In component segregation, removal shrinkage cavity, it is loose the defects of.
(3) slab is subjected to Homogenization Treatments, heats slab to 1200 DEG C, keeps the temperature 3 hours.
(4) slab after heat preservation is subjected to multistage hot deformation in duo mill, obtains steel plate.In the present embodiment, hot rolling
Passage is 7 times, and 1020 DEG C of hot rolling start rolling temperature, 860 DEG C of finishing temperature, the steel plate thickness after hot rolling is about 4mm, by multi-pass
The accumulative deflection of steel plate after hot rolling is 87%.
(5) solution treatment is carried out to the steel plate after hot rolling, obtains low-density high tenacity steel.In the present embodiment, using fast
Steel plate after hot rolling is heated to 1000 DEG C by fast heating, and direct-water-quenching obtains low-density high tenacity to room temperature after heat preservation 1 hour
Steel, metallographic structure are as shown in Figure 4.
Mechanics properties testing is carried out to finished product low-density high tenacity steel and obtains that the results are shown in Table 2.
Embodiment 4 (comparative example):
(1) according to mass percent shown in table 1: Mn:13%, Al:7%, C:0.52%, Cr:0.67%, V:0.1%,
Surplus is Fe and inevitable impurity, weighs the pure metal containing the above ingredient and its content or intermediate alloy is raw material, into
Row ingredient.
(2) ingredient is put into smelting furnace to smelt, slab is made, and the slab is forged into slab.
Specifically, ingredient is fitted into vacuum induction smelting furnace, rear power transmission heating is vacuumized, until ingredient is completely melt and melts
After pool surface bubble-free is overflowed, abundant deoxidation simultaneously carries out alloying under protection of argon gas, and then casting obtains slab.
In the present embodiment, slab is forged into the slab of 20mm or so, is air-cooled to room temperature.Slab is eliminated in forging process
In component segregation, removal shrinkage cavity, it is loose the defects of.
(3) slab is subjected to Homogenization Treatments, heats slab to 1160 DEG C, keeps the temperature 3 hours.
(4) slab after heat preservation is subjected to multistage hot deformation in duo mill, obtains steel plate.In the present embodiment, hot rolling
Passage is 7 times, and 1070 DEG C of hot rolling start rolling temperature, 870 DEG C of finishing temperature, the steel plate thickness after hot rolling is about 4mm, by multi-pass
The accumulative deflection of steel plate after hot rolling is 85%.
(5) solution treatment is carried out to the steel plate after hot rolling, obtains low-density high tenacity steel.In the present embodiment, using fast
Steel plate after hot rolling is heated to 1040 DEG C by fast heating, and direct-water-quenching obtains low-density high tenacity to room temperature after heat preservation 1 hour
Steel, metallographic structure are as shown in Figure 5.
Mechanics properties testing is carried out to finished product low-density high tenacity steel and obtains that the results are shown in Table 2.
Table 1 lists the mass percent of the chemical component of Examples 1 to 4.
Table 1
Table 2 lists the performance parameter of the low-density high tenacity steel obtained of Examples 1 to 4.
Table 2
According to the performance parameter data of the embodiment 1,2 and 4 in table 2 it is found that principal component (Mn, Al, C, Cr) quality
When percentage is close, the density of steel is essentially identical.
From the performance parameter data of Examples 1 to 3 and embodiment 4 it is found that the tension for being added to the steel of yttrium and wolfram element is strong
Degree is greater than 900MPa, and yield strength is greater than 730MPa, and elongation after fracture is greater than 45%, and strength and ductility product is greater than 40.5GPa%.It can
See, mitigate steel weight simultaneously so that steel have higher-strength and good plasticity.
It should be noted last that above-described specific embodiment, to the purpose of the present invention, technical solution and beneficial
Effect has been further described, it should be understood that the foregoing is merely a specific embodiment of the invention, and
Be not intended to limit the invention, it is all within the spirit and principle of technical solution of the present invention, any modification for being made, equivalent replacement,
Improve etc., it should be included within claims of the invention.
Claims (7)
1. a kind of low-density high tenacity steel, which is characterized in that its chemical component is by mass percentage are as follows: Mn:12%~25%,
Al:5%~13%, C:0.4%~2%, Cr:0.6%~1.5%, V:0.1%~0.5%, W:0.1~0.5%, Y:
0.05%~0.2%, surplus is inevitable other impurity elements in Fe and smelting process.
2. low-density high tenacity steel according to claim 1, which is characterized in that the density of the low-density high tenacity steel is low
In 7.4g/cm3, weight-loss ratio is greater than 6.7%.
3. low-density high tenacity steel according to claim 1, which is characterized in that the surrender of the low-density high tenacity steel is strong
Degree is greater than 730MPa, and tensile strength is greater than 900MPa, and elongation after fracture is greater than 45%, and strength and ductility product is greater than 40.5GPa%.
4. a kind of preparation method of low-density high tenacity steel, which comprises the following steps:
(1) using pure metal or intermediate alloy as raw material, chemical component according to claim 1 carries out ingredient；
(2) ingredient is put into smelting furnace to smelt, slab is made, and the slab is forged into slab；
(3) slab is subjected to Homogenization Treatments, heats the slab to 1140~1200 DEG C, keeps the temperature 3~4 hours；
(4) slab after heat preservation is subjected to multistage hot deformation in duo mill, obtains steel plate；
(5) solution treatment is carried out to the steel plate after hot rolling, obtains low-density high tenacity steel.
5. the preparation method according to claim 4, which is characterized in that the open rolling temperature of multistage hot deformation described in step (4)
1020~1080 DEG C of degree, 860~910 DEG C of finishing temperature, the slab is deformed through multi- pass rolling, then is air-cooled to room temperature.
6. preparation method according to claim 5, which is characterized in that the accumulative deflection of the steel after multistage hot deformation
It is 82%~87%.
7. the preparation method according to claim 4, which is characterized in that the step of solution treatment described in step (5), packet
It includes: the steel plate after hot rolling is heated to 1000~1050 DEG C, direct-water-quenching is to room temperature after heat preservation 0.5~1 hour.
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| CN201910565966.2A CN110218948A (en) | 2019-06-27 | 2019-06-27 | A kind of low-density high tenacity steel and preparation method thereof |
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| CN110877167A (en) * | 2019-12-16 | 2020-03-13 | 钢铁研究总院 | 690 MPa-level submerged arc welding wire for anti-seismic, corrosion-resistant and fire-resistant building structural steel |
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| CN112813356A (en) * | 2020-12-30 | 2021-05-18 | 上海大学 | 1500MPa ultrahigh-strength low-density steel and preparation method thereof |
| CN112899579A (en) * | 2021-01-18 | 2021-06-04 | 北京科技大学 | Corrosion-resistant high-strength light steel and preparation method thereof |
| CN114774806A (en) * | 2022-04-25 | 2022-07-22 | 燕山大学 | High-strength and high-toughness light steel plate and preparation method and application thereof |
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| CN112813356A (en) * | 2020-12-30 | 2021-05-18 | 上海大学 | 1500MPa ultrahigh-strength low-density steel and preparation method thereof |
| CN112899579A (en) * | 2021-01-18 | 2021-06-04 | 北京科技大学 | Corrosion-resistant high-strength light steel and preparation method thereof |
| CN112899579B (en) * | 2021-01-18 | 2022-03-29 | 北京科技大学 | Corrosion-resistant high-strength light steel and preparation method thereof |
| CN114774806A (en) * | 2022-04-25 | 2022-07-22 | 燕山大学 | High-strength and high-toughness light steel plate and preparation method and application thereof |
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Application publication date: 20190910 |