CN115821117A - GH4141 high-temperature alloy and preparation method thereof - Google Patents
GH4141 high-temperature alloy and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of GH4141 high-temperature alloy, which comprises the following steps of S1: material preparation and S2: material preparation and S3: charging and smelting, S4: refining and S5: casting and S6: electroslag remelting, S7: homogenization treatment, S8: and (5) forging. The invention also provides the GH4141 high-temperature alloy prepared by the method. The invention can improve the hot working plasticity of the alloy, reduce the processing difficulty of the material and improve the yield of the material.
Description
Technical Field
The invention relates to the field of high-temperature alloy production, in particular to a GH4141 high-temperature alloy and a preparation method thereof.
Background
GH4141 is a precipitation hardening nickel-based wrought superalloy, has high tensile and creep strength in the range of 650-900 ℃ and good oxidation resistance, and is used for manufacturing high-temperature parts of aviation and aerospace engines which are oxidized at 870 ℃. The alloy belongs to one of the alloys with the highest strength in the deformed high-temperature alloys due to high alloying degree, and is also one of the alloys with the highest processing difficulty.
GH4141 alloy is a well-known nickel-based wrought superalloy difficult to machine, and once called as "King of superalloy", not only contains Co + Cr + Mo up to approximately 40% (by 5% higher than GH 738) for solid solution strengthening and carbide strengthening, but also contains Al-Ti up to approximately 5% (by 0.5% higher than GH 738) for aging strengthening, the total content of comprehensive strengthening elements is up to 46%, the gamma' precipitation amount reaches approximately 30%, the ultrahigh alloying degree also causes great difficulty in machining, so that the conventional production method has higher machining difficulty for GH4141 alloy, and the GH4141 alloy has intercritical and carbide precipitation phenomena, the hot working plasticity is also poor, and the yield of the material is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of GH4141 high-temperature alloy, thereby solving the problem of low yield of GH4141 high-temperature alloy prepared by the conventional preparation method.
In order to solve the problems, the invention provides a preparation method of GH4141 high-temperature alloy, which comprises the following steps:
s1: preparing materials: calculating the raw material addition of each element of the alloy according to the quality ratio according to the control requirement of GH4141 alloy components;
s2: preparing materials: preparing metal nickel, metal chromium, metal molybdenum, metal titanium, metal aluminum and metal cobalt as smelting raw materials, and baking the raw materials;
s3: charging and smelting: putting the raw materials processed in the step S2 into a vacuum furnace, electrifying for melting, maintaining the low-power electrifying operation of the vacuum furnace at the initial stage of melting, and maintaining the power of the vacuum furnace at 60-80% of the total power of the vacuum furnace after certain molten steel exists in the furnace; after molten steel is completely melted down, the vacuum furnace is lifted to 100 percent of power, the temperature is raised to 1580 +/-10 ℃, and the temperature is kept when the temperature of the molten steel is stabilized to 1580 +/-10 ℃;
s4: refining: reducing the temperature of the vacuum furnace to 1520 ℃, introducing argon, adding a first deoxidizer into the molten steel, further reducing the temperature of the vacuum furnace to 1500 ℃, continuously introducing argon, and adding a second deoxidizer;
s5: casting: casting the molten steel treated in the step S4 into an ingot mold, and cooling and demolding to obtain a steel ingot;
s6: electroslag remelting: carrying out electroslag remelting on the steel ingot obtained in the step S5, and carrying out homogenization treatment to obtain an electroslag ingot;
s7: homogenizing: carrying out homogenization treatment on the electroslag ingot obtained in the step S6;
s8: forging: and forging the electroslag ingot subjected to homogenization treatment in the step S7 to obtain the GH4141 high-temperature alloy.
According to the preparation method of the GH4141 high-temperature alloy, the trace elements are added through a vacuum smelting process, the crystal boundary is strengthened, the solidification structure of an ingot is improved through electroslag remelting and directional solidification, the intercritical crystal and carbonization resolubility are eliminated through homogenization treatment, the hot working plasticity of a GH4141 high-temperature alloy steel ingot is improved through an element segregation production process, the processing difficulty of the material is reduced, and the yield of the material is improved.
Preferably, in step S1, the raw material blending amount includes: c:0.06-0.12%, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, less than or equal to 0.015% of S, cr:18.0-20.0%, mo:9.50 to 10.50 percent; co:10.0-12.0%, fe is less than or equal to 5.0, al:1.4-1.8%, ti:3.0-3.5%, B:0.003-0.010 percent of Zr, less than or equal to 0.07 percent of Zr, and the balance of nickel and other inevitable impurities.
Preferably, in step S2, the baking conditions are as follows: baking at 350 deg.C for 4 hr.
Preferably, in the step S3, the vacuum degree in the vacuum furnace is less than or equal to 50Pa, and in the step S4, the vacuum degree is less than or equal to 10Pa.
Preferably, in the step S4, the first deoxidizer is a nickel-magnesium alloy and is added in an amount of 0.2% of the total mass of the molten steel, and the second deoxidizer is a rare earth alloy and is added in an amount of 0.06% of the total mass of the molten steel.
Preferably, in step S5, the ingot mold further includes a pre-baking treatment before casting: baking the ingot mold at 200 ℃ for 4 hours; the cooling and demolding conditions are as follows: and demolding after mold cooling for 10 hours.
Preferably, in step S6, the slag system of the electroslag remelting is: caF 2 :Al 2 O 3 :CaO:MgO:TiO 2 ＝45:25:20:5:5。
Preferably, in step S7, the homogenization treatment includes: keeping the temperature at 600 ℃ for 3 hours, heating to 850 ℃ for the first time, and keeping the temperature for 2 hours; and heating to 1180 ℃ for the second time, keeping the temperature for 24 hours, slowly cooling to finish homogenization treatment, wherein the time of the first heating and the second heating is 3 hours.
Preferably, in step S8, the forging includes: keeping the temperature for 2 hours at 600 +/-10 ℃, heating to 950 +/-10 ℃ for the first time, and keeping the temperature for 2 hours; heating to 1150 +/-10 ℃ for the second time, preserving heat for 3 hours, then discharging from the furnace and forging, wherein the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 950 ℃, the time of the first heating is 3 hours, and the time of the second heating is 2 hours.
The invention aims to solve another technical problem of providing the GH4141 high-temperature alloy so as to solve the problems of relatively serious intercritical crystal and carbonization redissolution conditions and poor hot working plasticity in the conventional GH4141 high-temperature alloy.
In order to solve the problems, the invention provides a GH4141 high-temperature alloy which is prepared by any one of the preparation methods.
The GH4141 high-temperature alloy obtained by the method has good hot working plasticity and low processing difficulty, eliminates the problems of intercritical crystal and carbonization redissolution in the alloy, and has higher commercial value and popularization value.
Drawings
FIG. 1 is a schematic diagram of the critical deformation of GH4141 superalloy and a sample produced by a general process, wherein cracks appear on the surface of the sample within a forging temperature range; wherein, the curve B is an alloy curve prepared by the preparation method of the invention, and the curve A is a sample produced by a common process;
FIG. 2 is a process flow diagram of a GH4141 superalloy preparation method of the present invention prior to forging;
FIG. 3 is a homogenization profile of a GH4141 superalloy;
FIG. 4 is a forging heat treatment profile of a GH4141 superalloy.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. 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.
The invention provides a preparation method of GH4141 high-temperature alloy, which comprises the following steps:
s1: preparing materials: calculating the raw material addition of each element of the alloy according to the quality ratio according to the control requirement of GH4141 alloy components;
s2: preparing materials: preparing metal nickel, metal chromium, metal molybdenum, metal titanium, metal aluminum and metal cobalt as smelting raw materials, and baking the raw materials;
s3: charging and smelting: putting the raw materials processed in the step S2 into a vacuum furnace, electrifying for melting, maintaining the low-power electrifying operation of the vacuum furnace at the initial stage of melting, and maintaining the power of the vacuum furnace at 60-80% of the total power of the vacuum furnace after certain molten steel exists in the furnace; after molten steel is completely melted down, the vacuum furnace is lifted to 100 percent of power, the temperature is raised to 1580 +/-10 ℃, and the temperature is kept when the temperature of the molten steel is stabilized to 1580 +/-10 ℃;
s4: refining: reducing the temperature of the vacuum furnace to 1520 ℃, introducing argon, adding a first deoxidizer into the molten steel, further reducing the temperature of the vacuum furnace to 1500 ℃, continuously introducing argon, and adding a second deoxidizer;
s5: casting: casting the molten steel treated in the step S4 into an ingot mold, and cooling and demolding to obtain a steel ingot;
s6: electroslag remelting: carrying out electroslag remelting on the steel ingot obtained in the step S5, and carrying out homogenization treatment to obtain an electroslag ingot;
s7: homogenizing: carrying out homogenization treatment on the electroslag ingot obtained in the step S6;
s8: forging: and forging the electroslag ingot subjected to homogenization treatment in the step S7 to obtain the GH4141 high-temperature alloy.
Preferably, in step S1, the raw material blending amount includes: c:0.06-0.12%, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, less than or equal to 0.015% of S, cr:18.0-20.0%, mo:9.50 to 10.50 percent; co:10.0-12.0%, fe is less than or equal to 5.0, al:1.4-1.8%, ti:3.0-3.5%, B:0.003-0.010 percent of Zr, less than or equal to 0.07 percent of Zr, and the balance of nickel and other inevitable impurities.
Preferably, in step S2, the baking conditions are: baking at 350 deg.C for 4 hr.
Preferably, in the step S3, the vacuum degree in the vacuum furnace is less than or equal to 50Pa, and in the step S4, the vacuum degree is less than or equal to 10Pa.
Preferably, in the step S4, the first deoxidizer is a nickel-magnesium alloy, and the addition amount of the first deoxidizer is 0.2% of the total mass of the molten steel, and the second deoxidizer is a rare earth alloy, and the addition amount of the second deoxidizer is 0.06% of the total mass of the molten steel.
Preferably, in step S5, the ingot mold further includes a pre-baking treatment before casting: baking the ingot mold at 200 ℃ for 4 hours; the cooling and demolding conditions are as follows: and demolding after mold cooling for 10 hours.
Preferably, in step S6, the electroslag remelting slag system is: caF 2 :Al 2 O 3 :CaO:MgO:TiO 2 ＝45:25:20:5:5。
Preferably, in the step S7, the homogenization treatment includes: keeping the temperature at 600 ℃ for 3 hours, heating to 850 ℃ for the first time, and keeping the temperature for 2 hours; and heating to 1180 ℃ for the second time, keeping the temperature for 24 hours, slowly cooling to finish homogenization treatment, wherein the time of the first heating and the second heating is 3 hours.
Preferably, in step S8, the forging includes: keeping the temperature for 2 hours at 600 +/-10 ℃, heating to 950 +/-10 ℃ for the first time, and keeping the temperature for 2 hours; heating to 1150 +/-10 ℃ for the second time, preserving heat for 3 hours, then discharging from the furnace and forging, wherein the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 950 ℃, the time of the first heating is 3 hours, and the time of the second heating is 2 hours.
The invention also provides a GH4141 high-temperature alloy which is prepared by the preparation method.
The following description of the above-described embodiments of the present invention is provided in conjunction with specific embodiments and experimental data and experimental equipment:
example 1:
s1: preparing materials: calculating the raw material addition of each element of the alloy according to the quality ratio according to the control requirement of GH4141 alloy components;
the raw material mixing amount comprises: c:0.06-0.12%, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, less than or equal to 0.015% of S, cr:18.0-20.0%, mo:9.50 to 10.50 percent; co:10.0-12.0%, fe is less than or equal to 5.0, al:1.4-1.8%, ti:3.0-3.5%, B:0.003-0.010 percent of Zr, less than or equal to 0.07 percent of Zr, and the balance of nickel and other inevitable impurities.
S2: preparing materials: preparing metal nickel, metal chromium, metal molybdenum, metal titanium, metal aluminum and metal cobalt as smelting raw materials, and baking the raw materials; the conditions of the baking treatment are as follows: baking at 350 deg.C for 4 hr;
s3: charging and smelting: putting the raw materials processed in the step S2 into a vacuum furnace, electrifying for melting, maintaining the low-power electrifying operation of the vacuum furnace at the initial stage of melting, controlling the vacuum degree in the vacuum furnace to be less than or equal to 50Pa, and maintaining the power of the vacuum furnace to be 60 percent of the total power after certain molten steel exists in the vacuum furnace; after molten steel is completely melted down, the vacuum furnace is lifted to 100 percent of power, the temperature is raised to 1570 ℃, and the temperature is kept when the temperature of the molten steel is stabilized to 1570 ℃;
s4: refining: controlling the vacuum degree in the vacuum furnace to be less than or equal to 10Pa, reducing the temperature of the vacuum furnace to 1520 ℃, introducing argon, adding a first deoxidizer into the molten steel, further reducing the temperature of the vacuum furnace to 1500 ℃, continuously introducing argon, and adding a second deoxidizer; the first deoxidizer is a nickel-magnesium alloy, the addition amount of the first deoxidizer is 0.2 percent of the total mass of the molten steel, and the second deoxidizer is a rare earth alloy, the addition amount of the second deoxidizer is 0.06 percent of the total mass of the molten steel;
s5: casting: casting the molten steel treated in the step S4 into an ingot mold, and cooling and demolding to obtain a steel ingot; the ingot mould also comprises a pre-baking treatment before pouring: baking the ingot mold at 200 ℃ for 4 hours; the cooling and demolding conditions are as follows: demoulding after the mould is cooled for 10 hours;
s6: electroslag remelting: carrying out electroslag remelting on the steel ingot obtained in the step S5, and carrying out homogenization treatment to obtain an electroslag ingot; in the step S6, the slag system of the electroslag remelting is: caF 2 :Al 2 O 3 :CaO:MgO:TiO 2 5, the slag amount is 45KG; remelting current is 7200-8000A, remelting voltage is 52-58V, and the melting speed is controlled to be 245KG/h;
s7: homogenization treatment: carrying out homogenization treatment on the electroslag ingot obtained in the step S6; as shown in fig. 3, the homogenization treatment includes: keeping the temperature at 600 ℃ for 3 hours, heating to 850 ℃ for the first time, and keeping the temperature for 2 hours; and heating to 1180 ℃ for the second time, keeping the temperature for 24 hours, slowly cooling to finish homogenization treatment, wherein the time of the first heating and the second heating is 3 hours.
The flow chart of steps S1-S7 is shown in fig. 2.
S8: forging: forging the electroslag ingot after the homogenization treatment in the step S7 to obtain a GH4141 superalloy, as shown in fig. 4, wherein the forging comprises: keeping the temperature for 2 hours at 600 +/-10 ℃, heating to 950 +/-10 ℃ for the first time, and keeping the temperature for 2 hours; heating to 1150 +/-10 ℃ for the second time, preserving heat for 3 hours, then discharging from the furnace and forging, wherein the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 950 ℃, the time of the first heating is 3 hours, and the time of the second heating is 2 hours.
Example 2:
s1: preparing materials: according to the GH4141 alloy component control requirement, calculating the raw material addition amount of each element of the alloy according to the mass ratio;
the raw material mixing amount comprises: c:0.06-0.12%, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, less than or equal to 0.015% of S, cr:18.0-20.0%, mo:9.50 to 10.50 percent; co:10.0-12.0%, fe is less than or equal to 5.0, al:1.4-1.8%, ti:3.0-3.5%, B:0.003-0.010 percent of Zr, less than or equal to 0.07 percent of Zr, and the balance of nickel and other inevitable impurities.
S2: preparing materials: preparing metal nickel, metal chromium, metal molybdenum, metal titanium, metal aluminum and metal cobalt as smelting raw materials, and baking the raw materials; the conditions of the baking treatment are as follows: baking at 350 deg.C for 4 hr;
s3: charging and smelting: putting the raw materials processed in the step S2 into a vacuum furnace, electrifying for melting, maintaining the low-power electrifying operation of the vacuum furnace at the initial stage of melting, controlling the vacuum degree in the vacuum furnace to be less than or equal to 50Pa, and maintaining the power of the vacuum furnace to be 70 percent of the total power after certain molten steel exists in the vacuum furnace; after molten steel is completely melted down, the vacuum furnace is lifted to 100 percent of power, the temperature is raised to 1580 ℃, and the temperature is kept when the temperature of the molten steel is stabilized to 1580 ℃;
s4: refining: controlling the vacuum degree in the vacuum furnace to be less than or equal to 10Pa, reducing the temperature of the vacuum furnace to 1520 ℃, introducing argon, adding a first deoxidizer into the molten steel, further reducing the temperature of the vacuum furnace to 1500 ℃, continuously introducing argon, and adding a second deoxidizer; the first deoxidizer is a nickel-magnesium alloy, the addition amount of the first deoxidizer is 0.2 percent of the total mass of the molten steel, and the second deoxidizer is a rare earth alloy, the addition amount of the second deoxidizer is 0.06 percent of the total mass of the molten steel;
s5: casting: casting the molten steel treated in the step S4 into an ingot mold, and cooling and demolding to obtain a steel ingot; the ingot mould also comprises a pre-baking treatment before pouring: baking the ingot mold at 200 ℃ for 4 hours; the cooling demolding conditions are as follows: demoulding after the mould is cooled for 10 hours;
s6: electroslag remelting: carrying out electroslag remelting on the steel ingot obtained in the step S5, and carrying out homogenization treatment to obtain an electroslag ingot; in the step S6, the slag system of the electroslag remelting is: caF 2 :Al 2 O 3 :CaO:MgO:TiO 2 5, the slag amount is 45KG; remelting current is 7200-8000A, remelting voltage is 52-58V, and the melting speed is controlled to be 245KG/h;
s7: homogenizing: carrying out homogenization treatment on the electroslag ingot obtained in the step S6; as shown in fig. 3, the homogenization treatment includes: keeping the temperature at 600 ℃ for 3 hours, heating to 850 ℃ for the first time, and keeping the temperature for 2 hours; and heating to 1180 ℃ for the second time, keeping the temperature for 24 hours, slowly cooling to finish homogenization treatment, wherein the time of the first heating and the second heating is 3 hours.
The flow chart of steps S1-S7 is shown in fig. 2.
S8: forging: forging the electroslag ingot after the homogenization treatment in the step S7 to obtain a GH4141 superalloy, as shown in fig. 4, wherein the forging comprises: keeping the temperature for 2 hours at 600 +/-10 ℃, heating to 950 +/-10 ℃ for the first time, and keeping the temperature for 2 hours; heating to 1150 +/-10 ℃ for the second time, preserving heat for 3 hours, then discharging from the furnace and forging, wherein the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 950 ℃, the time of the first heating is 3 hours, and the time of the second heating is 2 hours.
Example 3:
s1: preparing materials: calculating the raw material addition of each element of the alloy according to the quality ratio according to the control requirement of GH4141 alloy components;
the raw material mixing amount comprises: c:0.06-0.12%, si is less than or equal to 0.5%, mn is less than or equal to 0.5%, S is less than or equal to 0.015%, cr:18.0-20.0%, mo:9.50 to 10.50 percent; co:10.0-12.0%, fe is less than or equal to 5.0, al:1.4-1.8%, ti:3.0-3.5%, B:0.003-0.010 percent of Zr, less than or equal to 0.07 percent of Zr, and the balance of nickel and other inevitable impurities.
S2: preparing materials: preparing metal nickel, metal chromium, metal molybdenum, metal titanium, metal aluminum and metal cobalt as smelting raw materials, and baking the raw materials; the conditions of the baking treatment are as follows: baking at 350 deg.C for 4 hr;
s3: charging and smelting: putting the raw materials treated in the step S2 into a vacuum furnace, electrifying for melting, maintaining the low-power electrifying operation of the vacuum furnace at the initial stage of melting, controlling the vacuum degree in the vacuum furnace to be less than or equal to 50Pa, and maintaining the power of the vacuum furnace to be 80 percent of the total power after certain molten steel exists in the furnace; after molten steel is completely melted down, the vacuum furnace is lifted to 100 percent of power, the temperature is raised to 1590 ℃, and the temperature is kept when the temperature of the molten steel is stabilized to 1590 ℃;
s4: refining: controlling the vacuum degree in the vacuum furnace to be less than or equal to 10Pa, reducing the temperature of the vacuum furnace to 1520 ℃, introducing argon, adding a first deoxidizer into the molten steel, further reducing the temperature of the vacuum furnace to 1500 ℃, continuously introducing argon, and adding a second deoxidizer; the first deoxidizer is a nickel-magnesium alloy, the addition amount of the first deoxidizer is 0.2 percent of the total mass of the molten steel, and the second deoxidizer is a rare earth alloy, the addition amount of the second deoxidizer is 0.06 percent of the total mass of the molten steel;
s5: casting: casting the molten steel treated in the step S4 into an ingot mold, and cooling and demolding to obtain a steel ingot; the ingot mould also comprises a pre-baking treatment before pouring: baking the ingot mold at 200 ℃ for 4 hours; the cooling and demolding conditions are as follows: demoulding after the mould is cooled for 10 hours;
s6: electroslag remelting: carrying out electroslag remelting on the steel ingot obtained in the step S5, and carrying out homogenization treatment to obtain an electroslag ingot; in the step S6, the slag system of the electroslag remelting is: caF 2 :Al 2 O 3 :CaO:MgO:TiO 2 5, the slag content is 45KG; remelting current is 7200-8000A, remelting voltage is 52-58V, and the melting speed is controlled to be 245KG/h;
s7: homogenizing: carrying out homogenization treatment on the electroslag ingot obtained in the step S6; as shown in fig. 3, the homogenization treatment includes: keeping the temperature at 600 ℃ for 3 hours, heating to 850 ℃ for the first time, and keeping the temperature for 2 hours; and heating to 1180 ℃ for the second time, keeping the temperature for 24 hours, slowly cooling to finish homogenization treatment, wherein the time of the first heating and the second heating is 3 hours.
The flow chart of steps S1-S7 is shown in fig. 2.
S8: forging: forging the electroslag ingot after the homogenization treatment in the step S7 to obtain a GH4141 superalloy, as shown in fig. 4, wherein the forging comprises: keeping the temperature for 2 hours at 600 +/-10 ℃, heating to 950 +/-10 ℃ for the first time, and keeping the temperature for 2 hours; heating to 1150 +/-10 ℃ for the second time, preserving heat for 3 hours, then discharging from the furnace and forging, wherein the forging temperature is more than or equal to 1100 ℃, the finish forging temperature is more than or equal to 950 ℃, the time of the first heating is 3 hours, and the time of the second heating is 2 hours.
As shown in fig. 1, when comparing the critical deformation amount of the GH4141 alloy sample prepared in example 1 (curve B) with the critical deformation amount of the sample produced by the general commercial process (curve a) in the whole forging temperature range, the critical deformation amount of the GH4141 alloy sample prepared in example 1 of the present invention with cracks on the surface is increased by 10% on average; the GH4141 alloy of the invention is proved to have better high-temperature plasticity.
The hot working temperature of the GH4141 alloy sample prepared by the embodiment of the invention is compared with that of an alloy experiment obtained by a conventional process, and the comparison data is as follows:
table 1: comparing the processing temperature ranges of the GH4141 alloy prepared by the conventional process and the method of the invention:
| temperature range for conventional hot working | 1000℃-1100℃ |
| The temperature range of the hot working of the |
950℃-1130℃ |
Through the comparison, the GH4141 alloy is further proved to have a wider hot working temperature range, the hot working temperature range of the conventional process is only 100 ℃, the requirement on temperature control is higher, and the hot working temperature range of the process is 180 ℃, and the hot working process performance is improved by 80%.
The yield of GH4141 obtained by the preparation method of the invention is compared:
the sample prepared in the embodiment 1 of the invention is made of materials with no crack in surface detection and no defect inside and outside ultrasonic flaw detection, and the statistics of the yield is 93.5%.
Table 2: GH4141 yield ratio comparison
The yield of the alloy obtained by the preparation method is greatly superior to that of the alloy obtained by the conventional method.
The invention adjusts the power in the smelting period, controls the melting process to slowly make the carbon-oxygen reaction fully, makes a proper melting pool active and not too boiling through 60-80% of the vacuum furnace power in the initial period, and adds high melting point metals such as niobium and molybdenum in the later period of the melting. And in the refining period, the vacuum degree is controlled to be less than or equal to 10Pa, the refining temperature and time are controlled, the elements are quickly adjusted according to the components in front of the furnace to be controlled internally, the alloying is accurately in place, and the alloying retention time is shortened.
The above examples further prove that the preparation method of the GH4141 superalloy improves the yield of the material, and the hot working temperature range and the high temperature plasticity of the prepared GH4141 superalloy are greatly superior to those of the conventional method.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (10)
1. A preparation method of GH4141 high-temperature alloy is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing materials: according to the GH4141 alloy component control requirement, calculating the raw material addition amount of each element of the alloy according to the mass ratio;
s2: preparing materials: preparing metal nickel, metal chromium, metal molybdenum, metal titanium, metal aluminum and metal cobalt as smelting raw materials, and baking the raw materials;
s3: charging and smelting: putting the raw materials processed in the step S2 into a vacuum furnace, electrifying for melting, maintaining the low-power electrifying operation of the vacuum furnace at the initial stage of melting, and maintaining the power of the vacuum furnace at 60-80% of the total power of the vacuum furnace after certain molten steel exists in the furnace; after the molten steel is completely melted down, the vacuum furnace is lifted to 100 percent of power, the temperature is raised to 1580 +/-10 ℃, and the temperature is kept when the temperature of the molten steel is stabilized to 1580 +/-10 ℃;
s4: refining: reducing the temperature of the vacuum furnace to 1520 ℃, introducing argon, adding a first deoxidizer into the molten steel, further reducing the temperature of the vacuum furnace to 1500 ℃, continuously introducing argon, and adding a second deoxidizer;
s5: casting: casting the molten steel treated in the step S4 into an ingot mold, and cooling and demolding to obtain a steel ingot;
s6: electroslag remelting: carrying out electroslag remelting on the steel ingot obtained in the step S5, and carrying out homogenization treatment to obtain an electroslag ingot;
s7: homogenizing: carrying out homogenization treatment on the electroslag ingot obtained in the step S6;
s8: forging: and forging the electroslag ingot subjected to homogenization treatment in the step S7 to obtain the GH4141 high-temperature alloy.
2. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S1, the raw material blending amount includes: c:0.06-0.12%, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, less than or equal to 0.015% of S, cr:18.0-20.0%, mo:9.50 to 10.50 percent; co:10.0-12.0%, fe is less than or equal to 5.0, al:1.4-1.8%, ti:3.0-3.5%, B:0.003-0.010 percent of Zr, less than or equal to 0.07 percent of Zr, and the balance of nickel and other inevitable impurities.
3. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S2, the baking conditions are: baked at 350 ℃ for 4 hours.
4. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S3, the vacuum degree in the vacuum furnace is less than or equal to 50Pa, and in the step S4, the vacuum degree is less than or equal to 10Pa.
5. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S4, the first deoxidizer is a nickel-magnesium alloy, the adding amount of the first deoxidizer is 0.2% of the total mass of the molten steel, and the second deoxidizer is a rare earth alloy, the adding amount of the second deoxidizer is 0.06% of the total mass of the molten steel.
6. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S5, the ingot mold further includes a pre-baking treatment before casting: baking the ingot mold at 200 ℃ for 4 hours; the cooling and demolding conditions are as follows: and demolding after mold cooling for 10 hours.
7. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S6, the slag system of the electroslag remelting is: caF 2 :Al 2 O 3 :CaO:MgO:TiO 2 ＝45:25:20:5:5。
8. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S7, the homogenization process includes: keeping the temperature at 600 ℃ for 3 hours, heating to 850 ℃ for the first time, and keeping the temperature for 2 hours; and heating to 1180 ℃ for the second time, keeping the temperature for 24 hours, slowly cooling to finish homogenization treatment, wherein the time of the first heating and the second heating is 3 hours.
9. The method for preparing GH4141 superalloy as in claim 1, wherein: in the step S8, the forging includes: keeping the temperature for 2 hours at 600 +/-10 ℃, heating to 950 +/-10 ℃ for the first time, and keeping the temperature for 2 hours; raising the temperature to 1150 +/-10 ℃ for the second time, preserving the temperature for 3 hours, then discharging from the furnace and forging, wherein the initial forging temperature is more than or equal to 1100 ℃, the final forging temperature is more than or equal to 950 ℃, the time of the first temperature rise is 3 hours, and the time of the second temperature rise is 2 hours.
10. A GH4141 superalloy, comprising: the alloy is prepared by the preparation method of any one of claims 1 to 9.
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