CN114799059A - High-temperature-resistant combined sand box module and preparation process thereof - Google Patents
High-temperature-resistant combined sand box module and preparation process thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant combined sand box module and a preparation process thereof, and particularly relates to the technical field of wind power casting modules, wherein the high-temperature-resistant combined sand box module is composed of a plurality of modules, the modules are made of high-temperature-resistant steel materials, and the high-temperature-resistant steel materials comprise the following raw materials: carbon, silicon, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium, lithium, sulfur, phosphorus, the balance being iron and unavoidable impurities. According to the invention, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium are added, the addition of chromium can effectively improve the hardness, strength and corrosion resistance of the module, molybdenum can improve the hardenability and heat strength of the module, molybdenum and tungsten can disperse and strengthen alloy, recrystallization is delayed, high temperature resistance is improved, rhenium is added to enable molybdenum, tungsten, carbide and the like to form elongated grain structures after recrystallization, and the impact resistance of the module can be effectively improved.
Description
Technical Field
The invention relates to the technical field of wind power casting modules, in particular to a high-temperature-resistant combined sand box module and a preparation process thereof.
Background
Sand casting is a casting method for producing castings in sand molds: filling the sand box with molding sand with a sand mold, injecting molten metal into the sand mold through a pouring cup, and cooling the molten metal in the sand mold to form a casting. The molding box is generally divided into a cope box and a drag box, and the cope box and the drag box are assembled, that is, the cope box and the drag box are closed by an opening to form a closed cavity.
The nodular iron castings are needed to be used in the casting process of the fan, and due to the rapid consumption of conventional non-renewable resources, wind energy resources are vigorously developed in all countries in the world, so that the market demand of the nodular iron castings for the fan is very vigorous. However, the competitive pressure in the existing nodular iron casting industry is increased, the price of raw materials is increased, and under the environment, on the premise of ensuring the quality of a fan, the cost control of the product is particularly prominent, the sand box is used as a main tool in the casting production process, the early investment cost is high, the purchase quantity of the sand box is too much, the production field is short, and the space utilization rate is reduced. The working condition and environment of the sand box are very complex, the ductile cast iron is graphitized and expands in the solidification process, and the sand box needs to restrain or reduce the force by the self rigidity in order to ensure the product quality; the sand box is continuously used in the production process, and often needs operations such as lifting, turning over and the like, and has higher requirement on the overall strength of the sand box. And the sand box works in a high-temperature environment for a long time, and has higher requirement on high-temperature resistance.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant combined sand box module and a preparation process thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a high temperature resistant combination sand box module, high temperature resistant combination sand box adopts a plurality of module to constitute, the module includes bottom sand-separating plate and curb plate, the curb plate is including a plurality of straight boards and four connection bent plates, just the inside wall bottom of straight board and connection bent plate is provided with and separates sand plate assorted draw-in groove with the bottom, every installation slot has all been seted up to the one end of straight board and connection bent plate, every the straight board all is provided with the installation lug with the one end of connecting the bent plate and keeping away from installation slot, bottom sand-separating plate, straight board and connection bent plate all adopt the preparation of high temperature resistant steel material to form.
In a preferred embodiment, the high temperature resistant steel material comprises the following raw materials in percentage by weight: 0.15 to 0.25 percent of carbon, 0.2 to 0.4 percent of silicon, 0.25 to 0.45 percent of copper, 0.2 to 0.5 percent of aluminum, 3 to 6 percent of chromium, 0.45 to 0.65 percent of molybdenum, 0.3 to 0.6 percent of tungsten, 0.15 to 0.35 percent of titanium, 0.2 to 0.4 percent of niobium, 0.15 to 0.45 percent of tantalum, 0.2 to 0.5 percent of rhenium, 0.1 to 0.5 percent of lithium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the high temperature resistant steel material comprises the following raw materials in percentage by weight: 0.18 to 0.22 percent of carbon, 0.25 to 0.35 percent of silicon, 0.3 to 0.4 percent of copper, 0.3 to 0.4 percent of aluminum, 4 to 5 percent of chromium, 0.5 to 0.6 percent of molybdenum, 0.4 to 0.5 percent of tungsten, 0.2 to 0.3 percent of titanium, 0.25 to 0.35 percent of niobium, 0.25 to 0.35 percent of tantalum, 0.3 to 0.4 percent of rhenium, 0.2 to 0.4 percent of lithium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the high temperature resistant steel material comprises the following raw materials in percentage by weight: 0.2% of carbon, 0.3% of silicon, 0.35% of copper, 0.35% of aluminum, 4.5% of chromium, 0.55% of molybdenum, 0.45% of tungsten, 0.25% of titanium, 0.3% of niobium, 0.3% of tantalum, 0.35% of rhenium, 0.3% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less and the contents of sulfur and phosphorus are not zero.
A preparation process of a high-temperature-resistant combined sand box module comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1250-;
step two: transferring the base material in the step one into a refining furnace, continuing to preserve heat at 1450-1500 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium raw materials, adding the mixture into the refining furnace after deoxidation and desulfurization, and performing melting, mixing and refining to obtain a mixed material liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: placing the rough blank of each module obtained in the step three at the temperature of 1000-1100 ℃ for oxidation treatment for 3-5h, and cooling to the temperature of 550-580 ℃ after the oxidation treatment for heat preservation treatment for 3-5 h;
step five: performing pre-strain treatment on the rough blank obtained in the step four, and performing dislocation strengthening treatment after the pre-strain treatment is completed;
step six: and (3) carrying out homogenization treatment and aging treatment after the dislocation strengthening treatment is finished, obtaining high-temperature resistant combined sand box modules after the aging treatment is finished, and assembling the high-temperature resistant combined sand box modules into high-temperature resistant sand boxes with different sizes by using the obtained modules.
In a preferred embodiment, in the second step, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, lithium and rhenium are added in the form of a copper ingot, an aluminum ingot, an iron-chromium intermediate alloy, an iron-molybdenum intermediate alloy, a tungsten ingot, an iron-titanium intermediate alloy, an iron-niobium intermediate alloy, an iron-tantalum intermediate alloy, a lithium iron intermediate alloy and rhenium trioxide, respectively.
In a preferred embodiment, after the step four-oxidation is completed, the temperature is reduced under the protection of nitrogen, and the temperature reduction rate is 20-24 ℃/min.
In a preferred embodiment, the pre-strain treatment in the step five is continuous rolling, pulling and straightening or bending, the temperature is kept at 420-480 ℃ for 20-30min during the dislocation strengthening treatment in the step five, and the hole expansion rate of the dislocation strengthening treatment in the step five is 55-60%.
In a preferred embodiment, the temperature of the homogenization treatment in the sixth step is 520-550 ℃, the treatment time is 4-6h, the aging treatment is low-temperature aging treatment, the temperature of the aging treatment is 180-220 ℃, and the treatment time is 24-48 h.
The invention has the technical effects and advantages that:
1. according to the high-temperature-resistant combined sand box module, the sand box is formed by the high-temperature-resistant combined modules, the sand box can be assembled according to the model of a product, and an independent sand box is not required to be arranged for each model of product, so that the investment of early cost can be reduced, and the occupied volume of a workshop can be reduced; the combined module for the sand box is made of steel alloy materials, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium are added, the addition of chromium can effectively improve the hardness, strength and corrosion resistance of the module, molybdenum can improve the hardenability and heat strength of the module, molybdenum and tungsten can disperse and strengthen the alloy, recrystallization is delayed, high-temperature resistance is improved, rhenium is added to ensure that molybdenum, tungsten, carbide and the like can be recrystallized to form elongated grain structures, the impact resistance of the module can be effectively improved, and lithium, aluminum and copper are added to form flakiness (Al) 2 CuLi) phase and (Al) 3 Li) is separated out,the strength of the module can be effectively improved, and the high-temperature performance and the creep strength of the module can be improved due to the fixed carbon and precipitation hardening effect by adding niobium and tantalum;
2. the invention adds elements such as silicon, rhenium, molybdenum, chromium and the like, and carries out oxidation treatment on the formed rough blank to form SiO 2 And La 2 O 3 Is Cr 2 O 3 Provides favorable nucleation sites and promotes fine dense Cr 2 O 3 The formation of protective layer for the high temperature resistant effect of module is better, through carrying out dislocation strengthening treatment to the rough blank after the shaping, can effectively improve the intensity of module.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a sand box constructed using the assembled modules of the present invention;
in the figure: 1. a bottom sand-separating plate; 2. a straight plate; 3. connecting the bent plates; 4. installing a clamping groove; 5. and mounting the convex block.
Detailed Description
Example 1:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached figure 1 of the specification, the invention provides the following technical scheme: the utility model provides a high temperature resistant combination sand box module, high temperature resistant combination sand box adopts a plurality of module to constitute, the module includes bottom sand-proof board 1 and curb plate, the curb plate is including a plurality of straight boards 2 and four connection bent plates 3, just straight board 2 is provided with the draw-in groove with bottom sand-proof board 1 assorted, every with the inside wall bottom of connecting bent plate 3 straight board 2 and the one end of connecting bent plate 3 have all seted up installation slot 4, every straight board 2 and the one end of connecting bent plate 3 and keeping away from installation slot 4 all are provided with installation lug 5, bottom sand-proof board 1, straight board 2 and connection bent plate 3 all adopt the preparation of high temperature resistant steel material to form, and installation lug 5 and installation slot 4 set up as integrated into one piece with bottom sand-proof board 1, straight board 2 and connection bent plate 3.
In a preferred embodiment, the high temperature resistant steel material comprises the following raw materials in percentage by weight: 0.15% of carbon, 0.2% of silicon, 0.25% of copper, 0.2% of aluminum, 3% of chromium, 0.45% of molybdenum, 0.3% of tungsten, 0.15% of titanium, 0.2% of niobium, 0.15% of tantalum, 0.2% of rhenium, 0.1% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less and the contents of sulfur and phosphorus are not zero.
A preparation process of a high-temperature-resistant combined sand box module comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1280 ℃ at the heating rate of 9 ℃/min, then heating to 1480 ℃ at the heating rate of 9 ℃/min with the full load current, adding the weighed carbon, silicon, sulfur and phosphorus after the ingredients in the intermediate frequency furnace are melted, and stirring and mixing uniformly to obtain a base material;
step two: transferring the base material in the step one into a refining furnace, keeping the temperature at 1480 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium raw materials, adding the mixture into the refining furnace after deoxidation and desulfurization, and performing melting, mixing and refining to obtain mixed feed liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: placing the rough blank of each module obtained in the third step at 1050 ℃ for oxidation treatment for 4h, and cooling to 560 ℃ after the oxidation is finished and carrying out heat preservation treatment for 4 h;
step five: performing pre-strain treatment on the rough blank obtained in the step four, and performing dislocation strengthening treatment after the pre-strain treatment is completed;
step six: and (3) carrying out homogenization treatment and aging treatment after the dislocation strengthening treatment is finished, obtaining high-temperature resistant combined sand box modules after the aging treatment is finished, and assembling the high-temperature resistant combined sand box modules into high-temperature resistant sand boxes with different sizes by using the obtained modules.
In a preferred embodiment, in the second step, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, lithium and rhenium are added in the form of a copper ingot, an aluminum ingot, an iron-chromium intermediate alloy, an iron-molybdenum intermediate alloy, a tungsten ingot, an iron-titanium intermediate alloy, an iron-niobium intermediate alloy, an iron-tantalum intermediate alloy, a lithium iron intermediate alloy and rhenium trioxide, respectively.
In a preferred embodiment, the temperature is reduced under the protection of nitrogen after the step of tetraoxidation is completed, and the temperature reduction rate is 22 ℃/min.
In a preferred embodiment, the pre-strain treatment in the fifth step is continuous rolling, pulling and straightening or bending, the heat preservation is carried out at 450 ℃ for 25min during the dislocation strengthening treatment in the fifth step, and the hole expansion rate of the dislocation strengthening treatment in the fifth step is 58%.
In a preferred embodiment, the temperature for the homogenization treatment in the sixth step is 535 ℃, the treatment time is 5h, the aging treatment is low-temperature aging treatment, the temperature for the aging treatment is 200 ℃, and the treatment time is 36 h.
Example 2:
different from the embodiment 1, the high-temperature resistant combined sand box module comprises the following raw materials in percentage by weight: 0.2% of carbon, 0.3% of silicon, 0.35% of copper, 0.35% of aluminum, 4.5% of chromium, 0.55% of molybdenum, 0.45% of tungsten, 0.25% of titanium, 0.3% of niobium, 0.3% of tantalum, 0.35% of rhenium, 0.3% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
Example 3:
different from the embodiments 1 and 2, the high-temperature resistant combined sand box module comprises the following raw materials in percentage by weight: 0.25% of carbon, 0.4% of silicon, 0.45% of copper, 0.5% of aluminum, 6% of chromium, 0.65% of molybdenum, 0.6% of tungsten, 0.35% of titanium, 0.4% of niobium, 0.45% of tantalum, 0.5% of rhenium, 0.5% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
Example 4:
a high-temperature resistant combined sand box module is characterized in that the high-temperature resistant steel material comprises the following raw materials in percentage by weight: 0.15% of carbon, 0.2% of silicon, 0.25% of copper, 0.2% of aluminum, 3% of chromium, 0.45% of molybdenum, 0.3% of tungsten, 0.15% of titanium, 0.2% of niobium, 0.15% of tantalum, 0.2% of rhenium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less and the contents of sulfur and phosphorus are not zero.
A preparation process of a high-temperature-resistant combined sand box module comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1280 ℃ at the heating rate of 9 ℃/min, then heating to 1480 ℃ at the heating rate of 9 ℃/min with the full load current, adding the weighed carbon, silicon, sulfur and phosphorus after the ingredients in the intermediate frequency furnace are melted, and stirring and mixing uniformly to obtain a base material;
step two: transferring the base material in the step one into a refining furnace, keeping the temperature at 1480 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum and rhenium raw materials, adding the mixture into the refining furnace after deoxidation and desulfurization, and performing melting, mixing and refining to obtain mixed feed liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: placing the rough blank of each module obtained in the third step at 1050 ℃ for oxidation treatment for 4h, and cooling to 560 ℃ after the oxidation is finished and carrying out heat preservation treatment for 4 h;
step five: performing pre-strain treatment on the rough blank obtained in the step four, and performing dislocation strengthening treatment after the pre-strain treatment is completed;
step six: and (3) carrying out homogenization treatment and aging treatment after the dislocation strengthening treatment is finished, obtaining high-temperature resistant combined sand box modules after the aging treatment is finished, and assembling the high-temperature resistant combined sand box modules into high-temperature resistant sand boxes with different sizes by using the obtained modules.
In a preferred embodiment, in the second step, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, and rhenium are added in the form of a copper ingot, an aluminum ingot, an iron-chromium intermediate alloy, an iron-molybdenum intermediate alloy, a tungsten ingot, an iron-titanium intermediate alloy, an iron-niobium intermediate alloy, an iron-tantalum intermediate alloy, and rhenium trioxide, respectively.
In a preferred embodiment, after the step of tetraoxidation is completed, the temperature is reduced under the protection of nitrogen, and the temperature reduction rate is 22 ℃/min.
In a preferred embodiment, the pre-strain treatment in the fifth step is continuous rolling, pulling and straightening or bending, the heat preservation is carried out at 450 ℃ for 25min during the dislocation strengthening treatment in the fifth step, and the hole expansion rate of the dislocation strengthening treatment in the fifth step is 58%.
In a preferred embodiment, the temperature for the homogenization treatment in the sixth step is 535 ℃, the treatment time is 5h, the aging treatment is low-temperature aging treatment, the temperature for the aging treatment is 200 ℃, and the treatment time is 36 h.
Example 5:
a high-temperature resistant combined sand box module is characterized in that the high-temperature resistant steel material comprises the following raw materials in percentage by weight: 0.15% of carbon, 0.2% of silicon, 0.25% of copper, 0.2% of aluminum, 3% of chromium, 0.15% of titanium, 0.2% of niobium, 0.15% of tantalum, 0.1% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less and the contents of sulfur and phosphorus are not zero.
A preparation process of a high-temperature-resistant combined sand box module comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1280 ℃ at the heating rate of 9 ℃/min, then heating to 1480 ℃ at the heating rate of 9 ℃/min with the full load current, adding the weighed carbon, silicon, sulfur and phosphorus after the ingredients in the intermediate frequency furnace are melted, and stirring and mixing uniformly to obtain a base material;
step two: transferring the base material in the step one into a refining furnace, keeping the temperature at 1480 ℃, carrying out deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum, chromium, titanium, niobium, tantalum and lithium raw materials, adding the mixture into the refining furnace after deoxidation and desulfurization, and carrying out melting mixing refining to obtain mixed feed liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: placing the rough blank of each module obtained in the third step at 1050 ℃ for oxidation treatment for 4h, and cooling to 560 ℃ after the oxidation is finished and carrying out heat preservation treatment for 4 h;
step five: performing pre-strain treatment on the rough blank obtained in the step four, and performing dislocation strengthening treatment after the pre-strain treatment is completed;
step six: and (3) carrying out homogenization treatment and aging treatment after the dislocation strengthening treatment is finished, obtaining high-temperature resistant combined sand box modules after the aging treatment is finished, and assembling the high-temperature resistant combined sand box modules into high-temperature resistant sand boxes with different sizes by using the obtained modules.
In a preferred embodiment, in the second step, copper, aluminum, chromium, titanium, niobium, tantalum, and lithium are added as a copper ingot, an aluminum ingot, an iron-chromium intermediate alloy, an iron-titanium intermediate alloy, an iron-niobium intermediate alloy, an iron-tantalum intermediate alloy, and a lithium iron intermediate alloy, respectively.
In a preferred embodiment, the temperature is reduced under the protection of nitrogen after the step of tetraoxidation is completed, and the temperature reduction rate is 22 ℃/min.
In a preferred embodiment, the pre-strain treatment in the fifth step is continuous rolling, pulling and straightening or bending, the heat preservation is carried out at 450 ℃ for 25min during the dislocation strengthening treatment in the fifth step, and the hole expansion rate of the dislocation strengthening treatment in the fifth step is 58%.
In a preferred embodiment, the temperature for the homogenization treatment in the sixth step is 535 ℃, the treatment time is 5h, the aging treatment is low-temperature aging treatment, the temperature for the aging treatment is 200 ℃, and the treatment time is 36 h.
Example 6:
a high-temperature resistant combined sand box module is characterized in that the high-temperature resistant steel material comprises the following raw materials in percentage by weight: 0.15% of carbon, 0.2% of silicon, 0.25% of copper, 0.2% of aluminum, 3% of chromium, 0.45% of molybdenum, 0.3% of tungsten, 0.15% of titanium, 0.2% of niobium, 0.15% of tantalum, 0.2% of rhenium, 0.1% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less and the contents of sulfur and phosphorus are not zero.
A preparation process of a high-temperature-resistant combined sand box module comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1280 ℃ at the heating rate of 9 ℃/min, then heating to 1480 ℃ at the heating rate of 9 ℃/min with the full load current, adding the weighed carbon, silicon, sulfur and phosphorus after the ingredients in the intermediate frequency furnace are melted, and stirring and mixing uniformly to obtain a base material;
step two: transferring the base material in the step one into a refining furnace, keeping the temperature at 1480 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium raw materials, adding the mixture into the refining furnace after deoxidation and desulfurization, and performing melting, mixing and refining to obtain mixed feed liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: and (3) homogenizing the rough blank and carrying out aging treatment, obtaining high-temperature resistant combined sand box modules after the aging treatment is finished, and assembling the high-temperature resistant combined sand box modules into high-temperature resistant sand boxes with different sizes by using the obtained modules.
In a preferred embodiment, in the second step, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, lithium and rhenium are added in the form of a copper ingot, an aluminum ingot, an iron-chromium intermediate alloy, an iron-molybdenum intermediate alloy, a tungsten ingot, an iron-titanium intermediate alloy, an iron-niobium intermediate alloy, an iron-tantalum intermediate alloy, a lithium iron intermediate alloy and rhenium trioxide, respectively.
In a preferred embodiment, the temperature of the homogenization treatment in the fourth step is 535 ℃, the treatment time is 5 hours, the aging treatment is low-temperature aging treatment, the temperature of the aging treatment is 200 ℃, and the treatment time is 36 hours.
Comparative example:
a high-temperature resistant combined sand box module is characterized in that the high-temperature resistant steel material comprises the following raw materials in percentage by weight: 0.15% of carbon, 0.2% of silicon, 0.25% of copper, 0.2% of aluminum, 3% of chromium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less and the contents of sulfur and phosphorus are not zero.
A preparation process of a high-temperature-resistant combined sand box module comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1280 ℃ at the heating rate of 9 ℃/min, then heating to 1480 ℃ at the heating rate of 9 ℃/min with the full load current, adding the weighed carbon, silicon, sulfur and phosphorus after the ingredients in the intermediate frequency furnace are melted, and stirring and mixing uniformly to obtain a base material;
step two: transferring the base material in the step one into a refining furnace, keeping the temperature at 1480 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum and chromium raw materials, adding the mixture into the refining furnace after deoxidation and desulfurization, and performing melting, mixing and refining to obtain mixed feed liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: and (3) homogenizing the rough blank and carrying out aging treatment, obtaining sand box modules after the aging treatment is finished, and assembling sand boxes with different sizes by using the obtained modules.
In a preferred embodiment, in the second step, copper, aluminum and chromium are added as copper ingot, aluminum ingot and ferrochrome intermediate alloy, respectively.
In a preferred embodiment, the temperature of the homogenization treatment in the fourth step is 535 ℃, the treatment time is 5 hours, the aging treatment is low-temperature aging treatment, the temperature of the aging treatment is 200 ℃, and the treatment time is 36 hours.
The modules prepared in the above examples 1-6 are respectively taken as an experiment group 1, an experiment group 2, an experiment group 3, an experiment group 4, an experiment group 5 and an experiment group 6, the modules produced in the comparative examples are taken as a control group for testing, and the tensile strength, the abrasion resistance and the high-temperature endurance strength of the selected modules are respectively tested (the tensile strength adopts GB/T228-02, ASTME8M-08, ISO 6892-. The test results are shown in table one:
watch 1
As can be seen from the table I, the high-temperature resistant module for the sand box produced by the invention has better mechanical property and better high-temperature endurance strength, the embodiment 4 is not added with lithium, the mechanical property and the high-temperature endurance strength are reduced compared with the embodiment 1, the embodiment 5 is added with molybdenum, tungsten and rhenium, the mechanical property and the high-temperature endurance strength are reduced compared with the embodiment 1, the embodiment 6 is not subjected to oxidation treatment and dislocation strengthening treatment, and the mechanical property and the high-temperature endurance strength are reduced compared with the embodiment 1, so the high-temperature resistant module is added with copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium, the addition of chromium element can effectively improve the hardness, the strength and the corrosion resistance of the module, and the molybdenum can improve the hardenability and the heat strength of the moduleMolybdenum and tungsten can be dispersed to strengthen the alloy, delay recrystallization and improve high-temperature strength, rhenium is added to ensure that molybdenum, tungsten, carbide and the like form elongated grain structures after recrystallization, the impact resistance of the module can be effectively improved, and lithium, aluminum and copper are added to form flaky (Al) 2 CuLi) phase and (Al) 3 Li) phase is separated out, the strength of the module can be effectively improved, and the high-temperature performance and the creep strength of the module can be improved due to the fixed carbon and precipitation hardening effect by adding niobium and tantalum; the invention adds elements such as silicon, rhenium, molybdenum, chromium and the like, and carries out oxidation treatment on the formed rough blank to form SiO 2 And La 2 O 3 Is Cr 2 O 3 Provides favorable nucleation sites and promotes fine dense Cr 2 O 3 The formation of the protective layer enables the high-temperature resistant effect of the module to be better, and the strength of the module can be effectively improved by dislocation strengthening treatment of the formed rough blank
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a high temperature resistant combination sand box module which characterized in that: high temperature resistant combination sand box adopts a plurality of module to constitute, the module includes bottom sand-separating plate (1) and curb plate, the curb plate is including a plurality of straight boards (2) and four connection bent plate (3), just straight board (2) and the inside wall bottom of connecting bent plate (3) are provided with bottom sand-separating plate (1) assorted draw-in groove, every installation slot (4), every have all been seted up to the one end of straight board (2) and connection bent plate (3) the one end of keeping away from installation slot (4) of straight board (2) and connection bent plate (3) all is provided with installation lug (5), bottom sand-separating plate (1), straight board (2) and connection bent plate (3) all adopt the preparation of high temperature resistant steel material to form.
2. The high temperature resistant combiner flask module of claim 1, wherein: the high-temperature-resistant steel material comprises the following raw materials in percentage by weight: 0.15 to 0.25 percent of carbon, 0.2 to 0.4 percent of silicon, 0.25 to 0.45 percent of copper, 0.2 to 0.5 percent of aluminum, 3 to 6 percent of chromium, 0.45 to 0.65 percent of molybdenum, 0.3 to 0.6 percent of tungsten, 0.15 to 0.35 percent of titanium, 0.2 to 0.4 percent of niobium, 0.15 to 0.45 percent of tantalum, 0.2 to 0.5 percent of rhenium, 0.1 to 0.5 percent of lithium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
3. A high temperature resistant matchbox module of claim 2 wherein: the high-temperature-resistant steel material comprises the following raw materials in percentage by weight: 0.18 to 0.22 percent of carbon, 0.25 to 0.35 percent of silicon, 0.3 to 0.4 percent of copper, 0.3 to 0.4 percent of aluminum, 4 to 5 percent of chromium, 0.5 to 0.6 percent of molybdenum, 0.4 to 0.5 percent of tungsten, 0.2 to 0.3 percent of titanium, 0.25 to 0.35 percent of niobium, 0.25 to 0.35 percent of tantalum, 0.3 to 0.4 percent of rhenium, 0.2 to 0.4 percent of lithium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
4. A high temperature resistant matchbox module of claim 2 wherein: the high-temperature-resistant steel material comprises the following raw materials in percentage by weight: 0.2% of carbon, 0.3% of silicon, 0.35% of copper, 0.35% of aluminum, 4.5% of chromium, 0.55% of molybdenum, 0.45% of tungsten, 0.25% of titanium, 0.3% of niobium, 0.3% of tantalum, 0.35% of rhenium, 0.3% of lithium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
5. A high temperature resistant matchbox module of claim 2 wherein: the content of the inevitable impurities is less than or equal to 0.005 percent, and the content of the sulfur and the phosphorus is not zero.
6. A preparation process of a high-temperature-resistant combined sand box module is characterized by comprising the following steps of: the method comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1250-;
step two: transferring the base material in the step one into a refining furnace, continuing to preserve heat at 1450 ℃ and 1500 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, rhenium and lithium raw materials, and adding the mixture into the refining furnace after deoxidation and desulfurization for melting, mixing and refining to obtain mixed feed liquid;
step three: respectively injecting the mixed liquid obtained in the step two into molds of different modules for vacuum degassing casting, and obtaining rough blanks of the modules after casting;
step four: carrying out oxidation treatment on the rough blank of each module obtained in the step three at the temperature of 1000-1100 ℃ for 3-5h, and cooling to the temperature of 550-580 ℃ after the oxidation treatment for 3-5 h;
step five: performing pre-strain treatment on the rough blank obtained in the step four, and performing dislocation strengthening treatment after the pre-strain treatment is completed;
step six: and (3) carrying out homogenization treatment and aging treatment after the dislocation strengthening treatment is finished, obtaining high-temperature resistant combined sand box modules after the aging treatment is finished, and assembling the high-temperature resistant combined sand box modules into high-temperature resistant sand boxes with different sizes by using the obtained modules.
7. The process for preparing a high temperature resistant combination flask module according to claim 6, wherein: and in the second step, copper, aluminum, chromium, molybdenum, tungsten, titanium, niobium, tantalum, lithium and rhenium are added in the modes of a copper ingot, an aluminum ingot, an iron-chromium intermediate alloy, an iron-molybdenum intermediate alloy, a tungsten ingot, an iron-titanium intermediate alloy, an iron-niobium intermediate alloy, an iron-tantalum intermediate alloy, a lithium iron intermediate alloy and rhenium trioxide respectively.
8. The process for preparing a high temperature resistant combination flask module according to claim 6, wherein: and after the four-step oxidation is finished, cooling is carried out under the protection of nitrogen, and the cooling rate is 20-24 ℃/min.
9. The process for preparing a high temperature resistant combination flask module according to claim 6, wherein: the pre-strain treatment in the step five is continuous rolling, pulling and straightening or bending, the heat preservation is carried out for 20-30min at the temperature of 420-480 ℃ during the dislocation strengthening treatment in the step five, and the hole expansion rate of the dislocation strengthening treatment in the step five is 55-60%.
10. The process for preparing a high temperature resistant combination flask module according to claim 6, wherein: the temperature of the homogenization treatment in the sixth step is 520-550 ℃, the treatment time is 4-6h, the aging treatment is low-temperature aging treatment, the temperature of the aging treatment is 180-220 ℃, and the treatment time is 24-48 h.
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