CN110964972A - Rare earth silicon-nitrogen-vanadium alloy and preparation method and application thereof - Google Patents
Rare earth silicon-nitrogen-vanadium alloy and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of iron-based alloys and alloy additives, and particularly relates to a rare earth silicon-nitrogen-vanadium alloy and a preparation method and application thereof. The rare earth silicon-nitrogen-vanadium alloy provided by the invention comprises the following element components in percentage by mass: si: 7-50%, N: 5-30%, Ce: 0-20%, La: 0-15%, Pr: 0-6%, Nd: 0-12%, Sm: 0-5%, V: 3-54%, B: 0-7.5% and the balance of Fe, wherein the contents of Ce, La, Pr, Nd and Sm are not 0 at the same time. The invention obtains the rare earth silicon-nitrogen-vanadium alloy by alloying a plurality of metal alloys by adopting a direct nitriding treatment process, solves the problems of overlapping and matching of the same component content in microalloying by simultaneously adding a plurality of metal alloys and unstable combined application effect, can better improve the comprehensive performance of steel and greatly reduce the manufacturing cost of special steel.
Description
Technical Field
The invention belongs to the technical field of iron-based alloys and alloy additives, and particularly relates to a rare earth silicon-nitrogen-vanadium alloy and a preparation method and application thereof.
Background
The special steel is different from the traditional steel, mainly comprises an alloy form, generally has the characteristics of good oxidation resistance, corrosion resistance, high temperature resistance and the like, can be used in extremely harsh environment, and is mainly used in special industries. Alloying is an important part in the production process flow of special steel, and mainly comprises molten steel alloying and molten steel microalloying, wherein molten steel microalloying elements generally refer to adding trace metal carbonitride forming elements, rare earth elements and the like on the basis of original main alloying elements, so that the alloying has influence on mechanical properties or plays a role in corrosion resistance and heat resistance; in the microalloying process of the molten steel, required elements are directly added in the steelmaking stage of a converter, but because the melting points of various metals are different, metal loss is easily caused in the production process, the effects of the elements cannot be fully exerted, and meanwhile, when a plurality of simple substance elements are jointly used, the effect of the elements superposed or interacted with each other on the microalloying of the molten steel is greatly influenced by a smelting process, so that the microalloying effect is unstable; the multifunctional function of the element is insufficient when the elemental element is used for micro-alloying, so that the comprehensive performance of the steel cannot be effectively improved; meanwhile, the alloying cost is increased by adopting simple substance elements for micro-alloying.
How to obtain special steel with high performance by improving the microalloying effect of molten steel on the premise of not increasing the alloy cost is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a rare earth silicon-nitrogen-vanadium alloy, a preparation method and application thereof.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following element components in percentage by mass: si: 7-50%, N: 5-30%, Ce: 0-20%, La: 0-15%, Pr: 0-6%, Nd: 0-12%, Sm: 0-5%, V: 3-54%, B: 0-7.5% and the balance of Fe, wherein the contents of Ce, La, Pr, Nd and Sm are not 0 at the same time.
Preferably, the rare earth silicon-nitrogen-vanadium alloy further comprises: cr: 0-19%, Mn: 0.03-21%, Mo: 0-7%, Ni: 0-6.5%, Ti: 0 to 11%, Nb: 0 to 8 percent.
The invention provides a preparation method of the rare earth silicon-nitrogen-vanadium alloy in the technical scheme, which comprises the following steps:
1) mixing raw materials of other element components except nitrogen according to element proportion, and grinding to obtain fine powder;
2) mixing the fine powder obtained in the step 1) with a binding agent to obtain a mixture;
3) and (3) nitriding the mixture obtained in the step 2), and then cooling to obtain the rare earth silicon-nitrogen-vanadium alloy.
Preferably, the nitriding treatment in step 3) is performed by sequentially subjecting the mixture to a low-temperature nitriding treatment and a high-temperature nitriding treatment.
Preferably, the temperature of the low-temperature nitriding treatment is 900-1100 ℃, and the time is 3-4 h; the temperature of the high-temperature nitriding treatment is 1350-1450 ℃, and the time is 6-7 h.
Preferably, the nitriding treatment in the step 3) is performed under a protective gas, the protective gas comprises nitrogen, and the pressure of the protective gas is 0.2-0.3 MPa; the cooling rate of the cooling in the step 3) is 3-4 ℃/min, and the temperature after the cooling is 200-300 ℃.
Preferably, the protective gas further comprises argon, and when the protective gas is argon or nitrogen, the concentration of the nitrogen is greater than or equal to 99%.
Preferably, the mass of the binding agent in the step 2) is 2-3% of the total weight of the fine powder, the binding agent comprises modified phenolic resin, and the carbon content in the modified phenolic resin is greater than or equal to 65%.
Preferably, the source of the raw material in step 1) comprises a simple substance and an oxide, and when the source of the rare earth element, the silicon element, the manganese element, the vanadium element and the iron element comprises an oxide of the corresponding element, the mixing in step 2) further adds a reducing agent; the dosage of the reducing agent is 10-20% of the total weight of the fine powder; the reducing agent comprises one or more of carbon powder, silicon powder and aluminum powder.
The invention also provides the application of the rare earth silicon-nitrogen-vanadium alloy in the technical scheme or the rare earth silicon-nitrogen-vanadium alloy obtained by the preparation method in the technical scheme in an alloy additive.
Has the advantages that: the invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following element components in percentage by mass: si: 7-50%, N: 5-30%, Ce: 0-20%, La: 0-15%, Pr: 0-6%, Nd: 0-12%, Sm: 0-5%, V: 3-54%, B: 0-7.5% and the balance of Fe, wherein the contents of Ce, La, Pr, Nd and Sm are not 0 at the same time. The vanadium is dissolved in the steel to play a role in solid solution strengthening, so that the strength, the hardness and the cold deformation work hardening rate of the steel are obviously improved, and simultaneously, the V and the N have a synergistic effect to realize precipitation strengthening on the basis of solid solution strengthening, so that the strengthening effect is greatly improved.
Furthermore, the invention alloys vanadium, silicon, nitrogen, rare earth elements and other elements, replaces rare earth alloy, silicon nitride and silicon-manganese nitride alloy to be applied to steel making or steel casting, does not need to add rare earth alloy and several kinds of nitride alloys at the same time, simplifies the application process and effectively widens the application range of the rare earth silicon-nitrogen-vanadium alloy. Meanwhile, in the preparation method, part of the oxide containing rare earth, Si, Mn and V can be selected or added as raw materials, so that the manufacturing cost is greatly reduced, the comprehensive cost is reduced by more than 35 percent compared with the equivalent alloy, the molten steel inclusion deformation improvement effect is good by adding the alloy, the steel crystal grain refinement level is improved and stable, the steel strengthening performance effect is excellent and stable, and the process of preparing the alloy is safe, environment-friendly and free of waste discharge.
Detailed Description
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following element components in percentage by mass: si: 7-50%, N: 5-30%, Ce: 0-20%, La: 0-15%, Pr: 0-6%, Nd: 0-12%, Sm: 0-5%, V: 3-54%, B: 0-7.5% and the balance of Fe, wherein the contents of Ce, La, Pr, Nd and Sm are not 0 at the same time.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 7 to 50%, preferably 10 to 38%, and more preferably 18 to 25%.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 5 to 30%, preferably 10 to 25%, and more preferably 13 to 18%.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 3 to 54%, preferably 10 to 35%, and more preferably 18 to 26%. In the invention, V is dissolved in the steel in a solid solution manner to play a role in solid solution strengthening, so that the strength, the hardness and the cold deformation work hardening rate of the steel are obviously improved, and simultaneously, the V and N have a synergistic effect to realize precipitation strengthening on the basis of solid solution strengthening, so that the strengthening effect is greatly improved.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 0 to 20%, preferably 0.2 to 18%, more preferably 3 to 12%, and still more preferably 5 to 10%.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 0 to 15%, preferably 0.1 to 15%, and more preferably 5 to 10%.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 0 to 6%, preferably 0.1 to 5%, and more preferably 2 to 3.1%.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 0 to 12%, preferably 1 to 10%, and more preferably 3 to 8.5%.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises Sm: 0 to 5%, preferably 0.1 to 3%, and more preferably 0.3 to 1.3%.
In the present invention, the rare earth element is preferably one or more of Ce, La, Pr, Nd, and Sm, and in an embodiment of the present invention, the rare earth element is preferably four of Ce, La, Sm, and Nd, three of Ce, Pr, and Sm, or two of Sm and Nd.
The invention provides a rare earth silicon-nitrogen-vanadium alloy which comprises the following components in percentage by mass: 0 to 7.5%, preferably 0.1 to 1.3%. In the invention, B and V cooperate to obviously improve the strengthening effect of the steel.
The rare earth silicon-nitrogen-vanadium alloy provided by the invention comprises the balance of Fe according to the mass content.
The rare earth silicon-nitrogen-vanadium alloy provided by the invention preferably further comprises the following components in percentage by mass: cr: 0-19%, Mn: 0.03-21%, Mo: 0-7%, Ni: 0-6.5%, Ti: 0 to 11%, Nb: 0 to 8 percent. The invention limits the content of Cr, Mn, Mo and Ni elements in the rare earth silicon-nitrogen-vanadium alloy to ensure that the alloy can improve the comprehensive performance of steel, thereby being capable of applying the rare earth silicon-nitrogen-vanadium alloy to the field of alloy additives.
The rare earth silicon-nitrogen-vanadium alloy provided by the invention further comprises impurities according to the mass content, wherein the impurities comprise Ca: 0.01-4.5%, Al: 0.02-6%, C: 0.05-7%, P is less than or equal to 0.2%, and S is less than or equal to 0.2%.
The invention limits the content of each element in a specific range, and obtains the rare earth silicon-nitrogen-vanadium alloy under the synergistic action of each element, and the rare earth silicon-nitrogen-vanadium alloy can better improve the mechanical strength of steel.
The invention also provides a preparation method of the rare earth silicon-nitrogen-vanadium alloy in the technical scheme, which comprises the following steps:
1) mixing raw materials of other element components except nitrogen according to element proportion, and grinding to obtain fine powder;
2) mixing the fine powder obtained in the step 1) with a binding agent to obtain a mixture;
3) and 3) nitriding the mixture in the step 2) to obtain the rare earth silicon-nitrogen-vanadium alloy.
The raw materials of other element components except nitrogen are mixed according to the element proportion and then ground into fine powder, and the particle size of the fine powder is preferably less than or equal to 0.2 mm. In the present invention, the raw material includes simple substances of the respective constituent elements or compounds containing the respective constituent elements. When the raw material includes a compound of a corresponding element component, the mass ratio of the compound to the simple substance is not particularly required as long as the content of the corresponding element component meets the requirement. The compound is preferably an oxide of the corresponding element, and the oxide preferably comprises CeO, SmO, NdO and La2O3、SiO2、MnO、V2O5And Fe2O3One or more of them.
The V source is preferably one or more of metal vanadium, vanadium pentoxide, vanadium slag and selected vanadium ore, and the production cost of the rare earth silicon-nitrogen-vanadium is remarkably reduced while the performance of the rare earth silicon-nitrogen-vanadium is ensured by enlarging the source of the vanadium.
The raw materials are preferably pretreated before being mixed, the pretreatment comprises impurity removal and moisture removal, and the impurity removal method has no special requirements and only needs a conventional method; the moisture removal is preferably carried out at 300-400 ℃.
The invention mixes the fine powder obtained by milling with a binding agent to obtain a mixture. The invention has no special requirement on the mixing mode, and adopts the mixing mode which is well known in the field as long as the mixing mode can be uniformly mixed. In the invention, the binding agent is preferably modified phenolic resin, the carbon content in the modified phenolic resin is preferably more than or equal to 65%, and the dosage of the binding agent is preferably 2-3% of the total weight of the fine powder. In the invention, the modified phenolic resin is purchased from an educational chemical auxiliary factory in the consolidation city, and the model number of the modified phenolic resin is NGL-A type. In the invention, the nanoscale modified phenolic resin has the following characteristics: the dispersibility is good, and the bonding strength is uniform; the sintering property at the later stage of the nitriding treatment is good, and the compactness and the strength of the rare earth silicon-nitrogen-vanadium alloy can be improved; the carbon in the modified phenolic resin can be fully utilized; the impurities introduced into the rare earth silicon-nitrogen-vanadium alloy are very few.
In the present invention, when a compound is included in the raw materials, the mixing preferably further adds a reducing agent that reduces the compound to a simple substance during the nitriding treatment. In the invention, the reducing agent is preferably carbon powder, silicon powder and aluminum powder, the carbon content in the carbon powder is preferably more than or equal to 95%, the silicon content in the silicon powder is preferably more than or equal to 98%, and the aluminum content in the aluminum powder is preferably more than or equal to 96%. In the invention, the carbon powder and the silicon powder can reduce the oxide of vanadium into the simple substance of vanadium, and the carbon powder, the silicon powder and the aluminum powder can reduce the oxide into the simple substance of the corresponding element. The addition of the reducing agent introduces carbon and aluminum impurities into the rare earth silicon-nitrogen-vanadium alloy.
After the mixture is obtained, the mixture is subjected to nitriding treatment to obtain the rare earth silicon-nitrogen-vanadium alloy. In the present invention, the nitriding treatment is preferably performed under a protective gas, the protective gas preferably includes nitrogen, and the pressure of the protective gas is preferably 0.2 to 0.3MPa, and more preferably 0.24 to 0.28 MPa. In the present invention, the protective gas preferably further includes argon, and when the protective gas is argon or nitrogen, the concentration of the nitrogen is greater than or equal to 99%.
In the present invention, the nitriding treatment is preferably performed by a stepwise nitriding treatment, and in the present invention, the nitriding treatment preferably includes a low-temperature nitriding treatment and a high-temperature nitriding treatment which are performed in this order. The segmented nitriding treatment is preferably realized in the same nitriding furnace by a continuous process, and the temperature of the low-temperature nitriding treatment in the invention is preferably 900-1100 ℃, and further preferably 1000-1060 ℃; the heating rate of heating to the low-temperature nitriding temperature is preferably 15-20 ℃/min; the time of the low-temperature nitriding treatment is preferably 3-4 h.
Immediately heating after low-temperature nitriding treatment, and then performing high-temperature nitriding treatment. In the invention, the temperature of the high-temperature nitriding treatment is preferably 1350-1450 ℃, and is further preferably 1375-1435 ℃; according to the invention, the temperature of the low-temperature nitriding treatment is preferably increased to the temperature of the high-temperature nitriding treatment, and the heating rate of the temperature increased to the high-temperature nitriding treatment is preferably 6-10 ℃/min; the time of the high-temperature nitriding treatment is preferably 6-7 h.
After the nitriding treatment, the obtained nitriding treatment product is preferably cooled to obtain the rare earth silicon-nitrogen-vanadium alloy, wherein the cooling rate is preferably 4.5-5.5 ℃/min, and the temperature after cooling is preferably 200-300 ℃.
The invention also provides the application of the rare earth silicon-nitrogen-vanadium alloy in the technical scheme or the rare earth silicon-nitrogen-vanadium alloy prepared by the preparation method in the technical scheme in an alloy additive.
In order to further illustrate the present invention, the following examples are given to describe the rare earth silicon-nitrogen-vanadium alloy of the present invention in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
The rare earth silicon-nitrogen-vanadium alloy provided by the embodiment 1 comprises the following element components in percentage by mass, Si: 7%, N: 10.2%, Ce: 20%, Pr: 6%, Sm: 5%, V: 3%, Ca: 6.0%, Ti: 11%, Al: 9%, C: 0.12%, P: 0.20%, Ni: 6.5%, Mg: 0.3 percent and the balance of Fe.
Weighing raw materials according to the content ratio of the element components, selecting simple substance raw materials for the raw materials in the embodiment, carrying out impurity removal and moisture removal pretreatment on the weighed raw materials, and grinding the pretreated raw materials to obtain fine powder with the particle size of less than or equal to 0.2 mm; then uniformly mixing the fine powder and the modified phenolic resin to obtain a mixture, and preparing the mixture into blocks, wherein the consumption of the modified phenolic resin accounts for 2% of the total mass of the fine powder, and the carbon content in the modified phenolic resin is 67%; and putting the blocky mixture into a nitriding furnace for nitriding treatment, wherein the pressure of nitrogen in the nitriding furnace is 0.2MPa, heating to 900 ℃ at the heating rate of 15 ℃/min, preserving heat for 4h, heating to 1450 ℃ at the heating rate of 6 ℃/min, preserving heat for 6h, and then cooling to 300 ℃ at the cooling rate of 3 ℃/min to obtain the rare earth silicon-nitrogen-vanadium alloy.
Example 2
The rare earth silicon-nitrogen-vanadium alloy provided by the embodiment 2 comprises the following element components in percentage by mass, namely Si: 11%, N: 30%, Ce: 1.7%, La: 15%, Pr: 0.80%, Nd: 8.2%, Sm: 1.03%, V: 16%, Cr: 1.9%, Mo: 0.5%, Ni: 0.9%, B: 0.65%, Nb: 0.7%, Ti: 1.6%, Ca: 0.01%, Mg: 0.41%, Al: 0.02%, C: 1.3%, S: 0.20 percent and the balance of Fe.
Weighing raw materials according to the content ratio of the element components, selecting simple substance raw materials for the raw materials in the embodiment, carrying out impurity removal and moisture removal pretreatment on the weighed raw materials, and grinding the pretreated raw materials to obtain fine powder with the particle size of less than or equal to 0.2 mm; then uniformly mixing the fine powder and modified phenolic resin to obtain a mixture, wherein the consumption of the modified phenolic resin accounts for 3% of the total mass of the fine powder, and the carbon content in the modified phenolic resin is 66%; and putting the mixture into a nitriding furnace for nitriding treatment, wherein the pressure of nitrogen in the nitriding furnace is 0.3MPa, heating to 1100 ℃ at the heating rate of 16 ℃/min, preserving heat for 3h, heating to 1350 ℃ at the heating rate of 6 ℃/min, preserving heat for 7h, and then cooling to 280 ℃ at the cooling rate of 4 ℃/min to obtain the rare earth silicon-nitrogen-vanadium alloy.
Example 3
The rare earth silicon-nitrogen-vanadium alloy provided by the embodiment 3 comprises the following element components in percentage by mass, namely Si: 13.6%, N: 10.2%, Ce: 0.21%, La: 4.30%, Nd: 3.6%, Sm: 0.4%, V: 31%, B: 0.68%, C: 9.5%, Cr: 1.1%, Mn: 0.03%, Ni: 0.3%, Nb: 8%, Mg: 4.5%, Ca: 0.3%, Al: 0.4%, P: 0.11%, S: 0.11 percent and the balance of Fe.
The raw materials are weighed according to the content ratio of the element components, the raw materials of the embodiment are a mixture of a simple substance and a compound, wherein the Ce source is a simple substance Ce and CeO, the Sm source is a simple substance Sm and SmO, and the V source is a simple substance V and a compound V2O5The Fe source is the iron simple substance and Fe2O3And the other raw materials are simple substances. Carrying out impurity removal and moisture removal pretreatment on the weighed raw materials, and grinding the pretreated raw materials to obtain fine powder with the particle size of less than or equal to 0.2 mm; uniformly mixing the fine powder, modified phenolic resin and carbon powder, silicon powder and aluminum powder serving as a reducing agent to obtain a mixture, wherein the using amount of the modified phenolic resin accounts for 2% of the total mass of the fine powder, the carbon content in the modified phenolic resin is 66.42%, and the adding amount of the reducing agent is 17% of the total mass of the fine powder; and putting the mixture into a nitriding furnace for nitriding treatment, filling mixed gas of nitrogen and argon into the nitriding furnace, heating to 1000 ℃ at a heating rate of 19 ℃/min, preserving heat for 3.5 hours, heating to 1400 ℃ at a heating rate of 7 ℃/min, preserving heat for 6.5 hours, and then cooling to 250 ℃ at a cooling rate of 4 ℃/min to obtain the rare earth silicon-nitrogen-vanadium alloy.
Example 4
The rare earth silicon-nitrogen-vanadium alloy provided in embodiment 4 includes the following elemental components by mass percent, Si: 8%, Ce: 3.7%, Pr: 2.2%, Nd: 1.4%, Cr: 1.5%, N: 5%, V: 54%, Ti: 0.8%, B: 7.5%, Ca: 0.20%, Mg: 1.1%, Mo: 7.0%, C: 0.05%, P: 0.06%, S: 0.03 percent and the balance of Fe.
The raw materials are weighed according to the content ratio of the element components, and the raw materials of the embodiment are a mixture of a simple substance and a compound, wherein the La source is a simple substance La and LaO, the Nd source is a simple substance Nd and NdO, and the V source is a simple substance V, V2O5And vanadium slag, wherein the Fe source is iron simple substance and Fe2O3And the other raw materials are simple substances. Removing impurities and water from the weighed raw materials, pretreating the pretreated raw materialsGrinding to obtain fine powder with a particle size of less than or equal to 0.2 mm; uniformly mixing the fine powder, modified phenolic resin and carbon powder, silicon powder and aluminum powder serving as a reducing agent to obtain a mixture, wherein the using amount of the modified phenolic resin accounts for 3% of the total mass of the fine powder, the carbon content in the modified phenolic resin is 65%, and the adding amount of the reducing agent is 13% of the total mass of the fine powder; and putting the mixture into a nitriding furnace for nitriding treatment, filling mixed gas of nitrogen and argon into the nitriding furnace, heating to 1050 ℃ at the heating rate of 20 ℃/min, preserving heat for 4h, heating to 1450 ℃ at the heating rate of 9 ℃/min, preserving heat for 6h, and reducing the temperature to 200 ℃ at the cooling rate of 3 ℃/min to obtain the rare earth silicon-nitrogen-vanadium alloy.
Example 5
The rare earth silicon-nitrogen-vanadium alloy provided by the embodiment 5 comprises the following element components in percentage by mass, namely Si: 50%, Cr: 19%, V: 3.2%, B: 0.13%, N: 5.1%, Mn: 21%, Ce: 0.1%, La: 0.2%, Sm: 0.1 percent and the balance of Fe.
Weighing raw materials according to the content ratio of the element components, selecting simple substance raw materials for the raw materials in the embodiment, carrying out impurity removal and moisture removal pretreatment on the weighed raw materials, and grinding the pretreated raw materials to obtain fine powder with the particle size of less than or equal to 0.2 mm; then uniformly mixing the fine powder and the modified phenolic resin to obtain a mixture, and preparing the mixture into pellets, wherein the use amount of the modified phenolic resin accounts for 2% of the total mass of the fine powder, and the carbon content in the modified phenolic resin is 66%; and (3) putting the mixture of the pellets into a nitriding furnace for nitriding treatment, wherein the pressure of nitrogen in the nitriding furnace is 0.25MPa, heating to 950 ℃ at the heating rate of 19 ℃/min, preserving heat for 3.5h, heating to 1400 ℃ at the heating rate of 10 ℃/min, preserving heat for 7h, and then cooling to 300 ℃ at the cooling rate of 4 ℃/min to obtain the rare earth silicon-nitrogen-vanadium alloy.
Comparative example 1
The experimental group 1 takes the rare earth silicon-nitrogen-vanadium alloy of the embodiment 1 as an experimental group, and the comparison group 1 takes the rare earth alloy, the silicon-nitrogen alloy and the vanadium alloy as alloy additives, wherein the rare earth alloy comprises rare earth RE: 31%, Si: 43%, and the balance being Fe, the silicon-nitrogen alloy including Si: 57%, N: 31% and the balance Fe, the vanadium alloy comprising V: 76%, N: 14% and the balance Fe. The alloy additives of the experimental group 1 and the control group 1 are respectively applied to the improvement of molten steel inclusion deformation, the refinement of steel crystal grains and the performance strengthening of steel, the improvement effect of the inclusion deformation of the experimental group 1 is good, the refinement level of the steel crystal grains is improved and stable, and the comprehensive performance strengthening effect of the steel is excellent and stable. Specific results are shown in table 1, and the data in table 1 are the average values obtained from two parallel tests.
TABLE 1 COMPARATIVE TABLE OF STEEL PERFORMANCE OF EXPERIMENTAL GROUP 1 AND COMPARATIVE GROUP 1
Comparative example 2
The experimental group 2 used the rare earth silicon-nitrogen-vanadium alloy of example 4 as an alloy additive, and the control group 2 used the rare earth alloy, silicon-nitrogen alloy and vanadium alloy as an alloy additive, wherein the rare earth alloy includes RE: 21%, Si: 34%, Mg: 9%, and the balance being Fe, the silicon-nitrogen alloy including V: 76%, N: 15%, the balance being Fe, the vanadium alloy comprising V: 76%, N: 15% and the balance Fe. The alloy additives of the experimental group 2 and the control group 2 are respectively applied to the improvement of molten steel inclusion deformation, the refinement of steel crystal grains and the performance strengthening of steel, the improvement effect of the inclusion deformation of the experimental group 2 is good, the refinement level of the steel crystal grains is improved and stable, and the comprehensive performance strengthening effect of the steel is excellent and stable. Specific results are shown in table 2, and the data in table 2 are the average values obtained from two parallel tests.
TABLE 2 comparison table of Steel Performance between Experimental group 2 and control group 2
From the results in tables 1 and 2, it can be seen that the rare earth silicon-nitrogen-vanadium alloy provided by the invention as the alloy additive can better improve the comprehensive performance of steel than the rare earth alloy, silicon-nitrogen alloy and vanadium alloy, the yield strength is improved by 1.9-4.9%, and the tensile strength is improved by 4.2-10.3%. And the compound of the element components can be selected as the raw material when the rare earth silicon-nitrogen-vanadium alloy is prepared, so that the cost of the alloy additive is reduced.
Compared with various alloys of rare earth alloy, silicon-nitrogen alloy and vanadium alloy as the alloy additive, the rare earth silicon-nitrogen-vanadium alloy provided by the invention can better improve the comprehensive performance of steel.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. The rare earth silicon-nitrogen-vanadium alloy comprises the following element components in percentage by mass: si: 7-50%, N: 5-30%, Ce: 0-20%, La: 0-15%, Pr: 0-6%, Nd: 0-12%, Sm: 0-5%, V: 3-54%, B: 0-7.5% and the balance of Fe, wherein the contents of Ce, La, Pr, Nd and Sm are not 0 at the same time.
2. The rare earth-silicon-nitrogen-vanadium alloy as claimed in claim 1, further comprising: cr: 0-19%, Mn: 0.03-21%, Mo: 0-7%, Ni: 0-6.5%, Ti: 0 to 11%, Nb: 0 to 8 percent.
3. The preparation method of the rare earth silicon-nitrogen-vanadium alloy according to any one of claims 1 to 2, characterized by comprising the following steps:
1) mixing raw materials of other element components except nitrogen according to element proportion, and grinding to obtain fine powder;
2) mixing the fine powder obtained in the step 1) with a binding agent to obtain a mixture;
3) and 3) nitriding the mixture in the step 2) to obtain the rare earth silicon-nitrogen-vanadium alloy.
4. The method for preparing the rare earth silicon-nitrogen-vanadium alloy as claimed in claim 3, wherein the nitriding treatment in the step 3) is to subject the mixture to low-temperature nitriding treatment and high-temperature nitriding treatment in sequence.
5. The preparation method of the rare earth silicon-nitrogen-vanadium alloy as claimed in claim 4, wherein the temperature of the low-temperature nitriding treatment is 900-1100 ℃ and the time is 3-4 h; the temperature of the high-temperature nitriding treatment is 1350-1450 ℃, and the time is 6-7 h.
6. The method for preparing the rare earth silicon-nitrogen-vanadium alloy according to any one of claims 3 to 5, wherein the nitriding treatment in the step 3) is performed under a protective gas, the protective gas comprises nitrogen, and the pressure of the protective gas is 0.2 to 0.3 MPa;
the cooling rate of the cooling in the step 3) is 3-4 ℃/min, and the temperature after the cooling is 200-300 ℃.
7. The method for preparing the rare earth silicon-nitrogen-vanadium alloy as claimed in claim 6, wherein the protective gas further comprises argon, and when the protective gas is argon or nitrogen, the concentration of the nitrogen is greater than or equal to 99%.
8. The preparation method of the rare earth silicon-nitrogen-vanadium alloy according to claim 3, wherein the mass of the binding agent in the step 2) is 2-3% of the total weight of the fine powder, the binding agent comprises modified phenolic resin, and the carbon content in the modified phenolic resin is greater than or equal to 65%.
9. The method for preparing the rare earth-silicon-nitrogen-vanadium alloy according to claim 3, wherein the source of the raw material in the step 1) comprises simple substances and oxides, and when the source of the rare earth element, the silicon element, the manganese element, the vanadium element and the iron element comprises oxides of corresponding elements, the reducing agent is further added in the step 2); the dosage of the reducing agent is 10-20% of the total weight of the fine powder; the reducing agent comprises one or more of carbon powder, silicon powder and aluminum powder.
10. Use of the rare earth silicon nitrogen vanadium alloy according to any one of claims 1 to 2 or the rare earth silicon nitrogen vanadium alloy obtained by the preparation method according to any one of claims 3 to 9 as an alloy additive.
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