CN114410995A - Controlled rolling process for texture of wrought superalloy GH3044 plate - Google Patents

Controlled rolling process for texture of wrought superalloy GH3044 plate Download PDF

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CN114410995A
CN114410995A CN202210076319.7A CN202210076319A CN114410995A CN 114410995 A CN114410995 A CN 114410995A CN 202210076319 A CN202210076319 A CN 202210076319A CN 114410995 A CN114410995 A CN 114410995A
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rolling process
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CN114410995B (en
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陈洁
李加坤
李家鑫
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Shaanxi Baorui Metal Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/023—Alloys based on nickel
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    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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    • Y02P10/25—Process efficiency

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Abstract

The texture control rolling process of the deformed high-temperature alloy GH3044 plate is provided, the technical advantages of pure smelting of the high-temperature alloy and precision rolling of the texture control large-deformation plate are fully combined, the problems of poor texture uniformity and large crystal grains of the GH3044 alloy plate are solved, and the material yield and the mechanical property of the alloy are improved; wherein, in the electroslag remelting process, the slag system adopted by GH3044 alloy electroslag remelting is CaF2：Al2O3The binary slag system has the advantages of simple slag system components, convenient preparation, low cost and low labor intensity, and adopts precise tissue controlThe hot rolling process effectively improves the structural characteristics of the GH3044 alloy plate, the GH3044 alloy plate has high purity, fine plate crystal grains and uniform structure, improves the quality level of the GH3044 alloy plate, and meets the use requirements in the high-temperature field.

Description

Controlled rolling process for texture of wrought superalloy GH3044 plate
Technical Field
The invention belongs to the technical field of preparation of a wrought superalloy plate, and particularly relates to a structure control rolling process of a wrought superalloy GH3044 plate.
Background
The nickel-based alloy is a metal material with wide application range and high-temperature strength in the wrought superalloy, and the main reason is that the nickel-based alloy can dissolve more alloy elements and keep good structural stability; and an A3B intermetallic compound gamma' [ Ni3(Al, Ti) ] phase with coherent order can be formed as a strengthening phase, so that the high-temperature strength is higher than that of an iron-based alloy and a cobalt-based alloy, and the nickel-based alloy with high chromium content has better oxidation resistance and fuel gas corrosion resistance; GH3044 is a Ni-Cr-based solid solution strengthening type deformation high-temperature alloy, contains a large amount of metal elements W and a small amount of Al and Ti elements, wherein the content of the element W is up to 13-16 percent (weight percentage, the same below), has higher strength and excellent oxidation resistance and corrosion resistance below 900 ℃, and the prepared products comprise plates, strips, wires, pipes, bars and the like.
The high-temperature alloy has high alloying degree and large difference of chemical compositions of different grades, so that the thermoplastic characteristics of the materials are greatly different. The alloy difficult to deform is characterized by higher deformation resistance and difficult hot biting during rolling; the content of solid solution strengthening element tungsten in the GH3044 alloy is up to 16 percent, the alloy belongs to a high-temperature alloy material which is difficult to deform, uniform deformation is required to be kept in the hot rolling process, cracks cannot be generated, the material cannot be scrapped, and meanwhile, the structure uniformity needs to be improved, crystal grains need to be refined, and the grade of the material needs to be improved. In addition, the hot rolling process and the hot rolling process of the GH3044 alloy plate directly influence the structure of the alloy plate, so that the technical difficulty is high in how to control the structure evolution of the alloy by combining the smelting process, the rolling process and the heat treatment process and finally obtain the homogeneous and fine-grained plate.
When the finishing temperature of the GH3044 alloy plate is higher, the temperature of the last rolling is also higher, the recrystallization driving force is large, under the appropriate deformation control, a softening mechanism mainly based on dynamic recrystallization is generated in the alloy, in the dynamic recrystallization process, the cross slip and climbing of dislocation are difficult, higher storage energy is accumulated in a local area of the alloy plate, so as to induce recrystallization nucleation, through the growth process of new crystal grains, the alloy is softened by decomposing or disappearing a large amount of dislocation, equiaxial crystal grains are generated in the plate after the recrystallization is finished, on one hand, if the finishing temperature is lower, the rolling deformation temperature of the last pass is lower, the deformation amount is smaller, so that the driving force of recrystallization in the alloy plate is lower, the dynamic recrystallization is difficult to generate, dynamic recovery is formed in the finishing rolling, in the dynamic recovery process, the material softening process caused by the compensation of hardening caused by dislocation proliferation and abnormal dislocation generation by the cancellation exists simultaneously, fibrous grain structures can be obtained, on the other hand, the finishing rolling temperature of the GH3044 alloy plate is increased, and the grain size is larger as the time for the grains to grow after recrystallization is longer; for example, the crystal grains are coarse at the finishing temperature of 1050 ℃, and the larger crystal grain size can cause the reduction of the alloy strength and cause adverse effects on the mechanical properties of the GH3044 alloy sheet; in addition, when the finish rolling temperature is lower than 980 ℃, the deformation resistance of the GH3044 alloy is increased, the alloy plasticity is reduced, the rolled plate is easily out of tolerance in size, the defects of a folding stool are generated, and meanwhile, the alloy cannot be dynamically recrystallized, and the problem of mixed crystals is generated, so that the proper rolling temperature has an important influence on the performance of the material; in addition, after the solution heat treatment of the GH3044 alloy plate, the internal structure is single-phase austenite and a small amount of MC and M23C6 type carbides, after long-term aging at 700-900 ℃, the MC is not changed greatly, the M23C6 is distributed in a chain shape at a grain boundary, and the performance is adversely affected by the increase of the precipitation amount and the growth of carbide particles along with the aging time, so improvement is needed to solve the problems.
Disclosure of Invention
The technical problems solved by the invention are as follows: provides a controlled rolling process for a deformed high-temperature alloy GH3044 plate structure,
the technical scheme adopted by the invention is as follows: the controlled rolling process of the deformed high-temperature alloy GH3044 plate structure comprises the following steps:
1) vacuum induction melting: putting raw materials prepared according to the standard proportion of each metal element of the GH3044 material into an alumina crucible of a vacuum induction furnace, and carrying out vacuum induction melting to prepare an electrode ingot;
2) electroslag remelting: CaF is adopted for the electrode ingot prepared by vacuum induction melting2：Al2O3Carrying out electroslag remelting on the binary slag system to form an electroslag ingot;
3) forging a plate blank: forging the GH3044 electroslag ingot into a plate blank with the thickness of 30-50 mm, wherein the forging heating temperature is 1170 +/-20 ℃, and the finish forging temperature is not lower than 930 ℃;
4) machining: machining the GH3044 alloy plate blank after forging, wherein the surface roughness range of the machined plate blank is 20-50 mu m;
5) ultrasonic flaw detection: performing ultrasonic flaw detection on the machined GH3044 alloy plate blank, wherein the diameter of a flat-bottom hole for flaw detection is 1.2 mm;
6) and (3) carrying out precise hot rolling under the condition of structure control: hot rolling the GH3044 alloy plate blank subjected to ultrasonic flaw detection by adopting a rolling method with multiple fire times and large deformation;
7) and (3) heat treatment: carrying out solution heat treatment on the hot-rolled GH3044 alloy plate by adopting a high-temperature precision heat treatment furnace, wherein the solution heat treatment temperature is 1150 +/-10 ℃, keeping the temperature of the center of the plate for 5-20 min after the temperature of the center of the plate is raised, and cooling after the heat treatment is finished;
8) and (5) inspecting the finished product to be qualified.
In the step 1), the GH3044 material is prepared from the following metal elements according to the standard mixture ratio by weight percent: c is less than or equal to 0.10, and Cr is 23.5-26.5; w: 13.0 to 16.0; ti: 0.3 to 0.7; mo is less than or equal to 1.50; al is less than or equal to 0.50; fe is less than or equal to 4.0; mn is less than or equal to 0.50; si is less than or equal to 0.80; p is less than or equal to 0.013; s is less than or equal to 0.013; ni: and (4) the balance.
In the step 1), the vacuum induction melting comprises a melting stage, an alloying stage, a refining stage and a casting stage, wherein the molten steel temperature control range of the refining stage is 1550 +/-20 ℃, and the refining time is 20-30 min; the casting temperature control range in the casting stage is 1470 +/-20 ℃; the vacuum degree of the alloying stage and the refining stage is 0.01 Pa-0.1 Pa; the temperature range of the melting stage and the alloying stage is 1480-1580 ℃, and the pressure range in the furnace of the melting stage is 0.5-1 Pa; and (3) uniformly dividing the total amount of the metal element Ti according to the adding times, and adding the metal element Ti in batches by a feeder at the later stage of the refining stage.
In the step 2), the binary slag system CaF2：Al2O370%: 30% in electroslag remeltingIn the process, the smelting speed is stably kept between 3Kg/min and 8Kg/min by controlling the current.
In the step 6), the rolling method with multiple heating times and large deformation is adopted, the initial rolling temperature is 1150 +/-10 ℃, the deformation of each pass is not lower than 25%, the rolling pass is not more than 5, and the control range of the final rolling temperature is 960-1020 ℃.
In the step 7), the heating rate of the heat-treated plate is 0.5 min/mm-1.0 min/mm.
Compared with the prior art, the invention has the advantages that:
1. the technical scheme fully combines the technical advantages of pure smelting of high-temperature alloy and precise rolling of a plate with large deformation controlled by a structure, not only solves the problems of poor structural uniformity and large crystal grains of the GH3044 alloy plate, but also improves the material yield and the mechanical property of the alloy;
2. in the electroslag remelting process of the technical scheme, CaF is adopted as a slag system for electroslag remelting of GH3044 alloy2： Al2O3The binary slag system has the advantages of simple slag system components, convenient preparation, low cost and low labor intensity;
3. the technical scheme adopts a structure control precise hot rolling process, effectively improves the structure characteristics of the GH3044 alloy plate, has high purity of the GH3044 alloy plate, fine crystal grains of the plate and uniform structure, improves the quality level of the GH3044 alloy plate, and meets the use requirements in the high-temperature field.
Detailed Description
The technical solutions are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1:
the controlled rolling process of the deformed high-temperature alloy GH3044 plate structure comprises the following steps:
1) vacuum induction melting: putting raw materials prepared according to the standard proportion of each metal element of the GH3044 material into an alumina crucible of a vacuum induction furnace, and carrying out vacuum induction melting to prepare an electrode ingot; specifically, the GH3044 material is prepared from the following metal elements in percentage by weight according to a standard ratio: c: 0.05; 24.0 parts of Cr; w: 14.0; ti: 0.4; mo: 0.50; al: 0.50; fe: 1.0; mn; 0.20; si: 0: 30; ni: the balance; specifically, the vacuum induction melting comprises a melting stage, an alloying stage, a refining stage and a casting stage, wherein the temperature control range of molten steel in the refining stage is 1550 ℃, the refining time is 20min, and gases in the molten steel can be fully removed at a higher refining temperature; the casting temperature control range in the casting stage is 1470 ℃; the vacuum degrees of the alloying stage and the refining stage are 0.01, and the content of harmful elements in the alloy can be effectively reduced by smelting in a high vacuum environment and utilizing the optimized refining process and the electromagnetic stirring process; the temperature range of the melting stage and the alloying stage is 1480 ℃, and the pressure range in the furnace of the melting stage is 0.5 Pa; after the total amount of the metal element Ti is uniformly divided according to the adding times, the metal element Ti is added in batches through a feeder at the later stage of the refining stage, so that harmful N element in the alloy can be further reduced;
2) electroslag remelting: CaF is adopted for the electrode ingot prepared by vacuum induction melting2：Al2O3The binary slag system is subjected to electroslag remelting to form an electroslag ingot, and has the advantages of simple components, easiness in preparation, low cost and the like; specifically, the binary slag system CaF2：Al2O370%: 30 percent, in the electroslag remelting process, the smelting speed is stably kept at 3Kg/min by controlling the current, which is beneficial to reducing the depth of a molten pool and reducing the component segregation of the cast ingot, thereby obtaining the electroslag cast ingot with small inclusion content and low segregation.
3) Forging a plate blank: forging the GH3044 electroslag ingot into a plate blank with the thickness of 30mm, wherein the forging heating temperature is 1170, and the finish forging temperature is not lower than 930 ℃;
4) machining: machining the GH3044 alloy plate blank after forging, wherein the surface roughness range of the machined plate blank is 20 mu m;
5) ultrasonic flaw detection: performing ultrasonic flaw detection on the machined GH3044 alloy plate blank, wherein the diameter of a flat-bottom hole adopted for flaw detection is 1.2mm, and the situation that the interior of the plate has no metallurgical defects such as layering, folding and the like is ensured;
6) and (3) carrying out precise hot rolling under the condition of structure control: in order to ensure the hot rolling recrystallization structure of the GH3044 alloy, a rolling method with multiple fire times and large deformation is adopted to carry out hot rolling on the GH3044 alloy plate blank subjected to ultrasonic flaw detection; specifically, the initial rolling temperature is 1140 ℃, the deformation of each pass is 25%, the rolling pass is 4, the control range of the final rolling temperature is 960 ℃ and the control of the final rolling temperature is the key for preparing the fine-grained homogeneous GH3044 alloy plate by adopting a multi-fire-pass large-deformation rolling method, because the two processes of work hardening and dynamic recovery recrystallization softening are simultaneously carried out in the hot rolling process of the high-temperature alloy plate, the structure characteristics of the alloy are directly influenced;
7) and (3) heat treatment: carrying out solution heat treatment on the hot-rolled GH3044 alloy plate by adopting a high-temperature precision heat treatment furnace, wherein the solution heat treatment temperature is 1140 ℃, keeping the temperature of the center of the plate for 5min after the temperature reaches the temperature, and cooling after the heat treatment is finished, wherein the cooling can adopt tapping cooling or other cooling modes; specifically, the heating rate of the heat-treated plate is 0.5min/mm, and through solution heat treatment, dynamic recrystallization occurs in the GH3044 alloy plate to obtain the GH3044 fine-grained plate with the grain size not lower than 7 grade and the grain size grade difference not more than 2 grade;
8) and (5) inspecting the finished product to be qualified.
Example 2:
the controlled rolling process of the deformed high-temperature alloy GH3044 plate structure comprises the following steps:
1) vacuum induction melting: putting raw materials prepared according to the standard proportion of each metal element of the GH3044 material into an alumina crucible of a vacuum induction furnace, and carrying out vacuum induction melting to prepare an electrode ingot; specifically, the GH3044 material is prepared from the following metal elements in percentage by weight according to a standard ratio: c: 0.40, 26.0 of Cr; w: 15.0 parts of; ti: 0.6; mo: 1.30; al: 0: 40; 3.0 of Fe; mn: 0.50; si: 0.60; ni: the balance; specifically, the vacuum induction smelting comprises a melting stage, an alloying stage, a refining stage and a casting stage, wherein the molten steel temperature control range of the refining stage is 1560 ℃, the refining time is 25min, and gases in the molten steel can be fully removed at a higher refining temperature; the casting temperature control range in the casting stage is 1480 ℃; the vacuum degrees of the alloying stage and the refining stage are 0.05Pa, and the content of harmful elements in the alloy can be effectively reduced by smelting in a high vacuum environment and utilizing the optimized refining process and the electromagnetic stirring process; the temperature range of the melting stage and the alloying stage is 1530 ℃, and the pressure range in the furnace of the melting stage is 0.8 Pa; after the total amount of the metal element Ti is uniformly divided according to the adding times, the metal element Ti is added in batches through a feeder at the later stage of the refining stage, so that harmful N element in the alloy can be further reduced;
2) electroslag remelting: CaF is adopted for the electrode ingot prepared by vacuum induction melting2: the Al2O3 binary slag system is subjected to electroslag remelting to form an electroslag ingot, and the method has the advantages of simple components, easiness in preparation, low cost and the like; specifically, the binary slag system CaF2：Al2O370%: 30 percent, in the electroslag remelting process, the smelting speed is stably kept at 5Kg/min by controlling the current, which is beneficial to reducing the depth of a molten pool and reducing the component segregation of the cast ingot, thereby obtaining the electroslag cast ingot with small inclusion content and low segregation.
3) Forging a plate blank: forging the GH3044 electroslag ingot into a plate blank with the thickness of 40mm, wherein the forging heating temperature is 1180 ℃, and the finish forging temperature is 940 ℃;
4) machining: machining the GH3044 alloy plate blank after forging, wherein the surface roughness range of the machined plate blank is 30 mu m;
5) ultrasonic flaw detection: performing ultrasonic flaw detection on the machined GH3044 alloy plate blank, wherein the diameter of a flat-bottom hole adopted for flaw detection is 1.2mm, and the situation that the interior of the plate has no metallurgical defects such as layering, folding and the like is ensured;
6) and (3) carrying out precise hot rolling under the condition of structure control: in order to ensure the hot rolling recrystallization structure of the GH3044 alloy, a rolling method with multiple fire times and large deformation is adopted to carry out hot rolling on the GH3044 alloy plate blank subjected to ultrasonic flaw detection; specifically, the initial rolling temperature is 1150 ℃ when the hot rolling is carried out by adopting a multi-fire-number large-deformation rolling method, the deformation of each pass is not lower than 28%, the rolling passes are 4, the control range of the final rolling temperature is 1000 ℃, and the control of the final rolling temperature is the key for preparing the fine-grained homogeneous GH3044 alloy plate, because in the hot rolling process of the high-temperature alloy plate, two processes of work hardening and dynamic recovery recrystallization softening are simultaneously carried out inside the high-temperature alloy plate, the structure characteristics of the alloy are directly influenced;
7) and (3) heat treatment: carrying out solution heat treatment on the hot-rolled GH3044 alloy plate by adopting a high-temperature precision heat treatment furnace, wherein the solution heat treatment temperature is 1150 ℃, keeping the temperature of the center of the plate for 10min after the temperature reaches the temperature, and cooling after the heat treatment is finished, wherein the cooling can adopt tapping cooling or other cooling modes; specifically, the heating rate of the heat-treated plate is 0.8min/mm, and through solution heat treatment, dynamic recrystallization occurs in the GH3044 alloy plate to obtain the GH3044 fine-grained plate with the grain size not lower than 7 and the grain size difference not greater than 2;
8) and (5) inspecting the finished product to be qualified.
Example 3:
the controlled rolling process of the deformed high-temperature alloy GH3044 plate structure comprises the following steps:
1) vacuum induction melting: putting raw materials prepared according to the standard proportion of each metal element of the GH3044 material into an alumina crucible of a vacuum induction furnace, and carrying out vacuum induction melting to prepare an electrode ingot; specifically, the GH3044 material is prepared from the following metal elements in percentage by weight according to a standard ratio: c: 0.10, 26.5 of Cr; w: 13.0 to 16.0; ti: 0.7; mo: 1.50; al: 0.50; fe: 4.0; mn: 0.50; si: 0.80; ni: the balance; specifically, the vacuum induction melting comprises a melting stage, an alloying stage, a refining stage and a casting stage, wherein the temperature of molten steel in the refining stage is controlled within 1570 ℃, the refining time is 30min, and gases in the molten steel can be fully removed at a higher refining temperature; the control range of the casting temperature in the casting stage is 1490 ℃; the vacuum degrees of the alloying stage and the refining stage are 0.1Pa, and the content of harmful elements in the alloy can be effectively reduced by smelting in a high vacuum environment and utilizing the optimized refining process and the electromagnetic stirring process; the temperature range of the melting stage and the alloying stage is 1580 ℃, and the pressure range in the melting stage is 1 Pa; after the total amount of the metal element Ti is uniformly divided according to the adding times, the metal element Ti is added in batches through a feeder at the later stage of the refining stage, so that harmful N element in the alloy can be further reduced;
2) electroslag remelting: CaF is adopted for the electrode ingot prepared by vacuum induction melting2: the Al2O3 binary slag system is subjected to electroslag remelting to form an electroslag ingot, and the method has the advantages of simple components, easiness in preparation, low cost and the like; specifically, the binary slag system CaF2：Al2O370%: 30 percent, in the electroslag remelting process, the smelting speed is stably kept at 8Kg/min by controlling the current, which is beneficial to reducing the depth of a molten pool and reducing the component segregation of the cast ingot, thereby obtaining the electroslag cast ingot with small inclusion content and low segregation.
3) Forging a plate blank: forging a GH3044 electroslag ingot into a plate blank with the thickness of 50mm, wherein the forging heating temperature is 1190 ℃, and the finish forging temperature is not lower than 950 ℃;
4) machining: machining the GH3044 alloy plate blank after forging, wherein the surface roughness range of the machined plate blank is 50 mu m;
5) ultrasonic flaw detection: performing ultrasonic flaw detection on the machined GH3044 alloy plate blank, wherein the diameter of a flat-bottom hole adopted for flaw detection is 1.2mm, and the situation that the interior of the plate has no metallurgical defects such as layering, folding and the like is ensured;
6) and (3) carrying out precise hot rolling under the condition of structure control: in order to ensure the hot rolling recrystallization structure of the GH3044 alloy, a rolling method with multiple fire times and large deformation is adopted to carry out hot rolling on the GH3044 alloy plate blank subjected to ultrasonic flaw detection; specifically, the initial rolling temperature is 1160 ℃, the deformation of each pass is 30%, the rolling pass is 3, the control range of the final rolling temperature is 1020 ℃, and the control of the final rolling temperature is the key for preparing the fine-grained homogeneous GH3044 alloy plate by adopting a multi-fire-pass large-deformation rolling method, because in the hot rolling process of the high-temperature alloy plate, two processes of work hardening and dynamic recovery recrystallization softening are simultaneously carried out inside the high-temperature alloy plate, the structure characteristics of the alloy are directly influenced;
7) and (3) heat treatment: carrying out solution heat treatment on the hot-rolled GH3044 alloy plate by adopting a high-temperature precision heat treatment furnace, wherein the solution heat treatment temperature is 1160 ℃, keeping the temperature for 20min after the center of the plate reaches the temperature, and cooling after the heat treatment is finished, wherein the cooling can adopt tapping cooling or other cooling modes; specifically, the heating rate of the heat-treated plate is 1.0min/mm, and through solution heat treatment, dynamic recrystallization occurs in the GH3044 alloy plate to obtain the GH3044 fine-grained plate with the grain size not lower than 7 and the grain size difference not greater than 2;
8) and (5) inspecting the finished product to be qualified.
In the technical scheme, the electroslag remelting process comprises the following steps: the slag system adopted by electroslag remelting of GH3044 alloy is CaF2： Al2O3The binary slag system has the advantages of simple slag system components, convenient preparation, low cost, low labor intensity and the like, and the binary slag system is prepared from CaF2：Al2O370%: 30 percent, the smelting speed is 3 to 8Kg/min in the electroslag remelting process, the depth of a molten pool can be reduced, the component segregation of the ingot is reduced, and an electroslag ingot with low inclusion content and low segregation is obtained; secondly, a structure control precision hot rolling process, in order to ensure the structure of the GH3044 alloy plate, a rolling process with large deformation is adopted, the rolling temperature is 1150 +/-10 ℃, the deformation of each pass is not lower than 25%, the rolling pass is not more than 5, the control range of the final rolling temperature is 960-1020 ℃, the control of the final rolling temperature is the key for preparing the fine-grained homogeneous GH3044 alloy plate, because the two processes of work hardening and dynamic recovery recrystallization softening are simultaneously carried out in the hot rolling process of the high-temperature alloy plate, the structure characteristics of the alloy are directly influenced, therefore, the structure control precision hot rolling process reasonably optimizes the quality and the times of each pass of the high-temperature alloy plate, effectively improves the structure characteristics of the alloy, has the advantages of high purity, fine plate crystal grains, uniform structure and the like, improves the quality level of the GH3044 alloy plate, the use requirement in the high temperature field is met.
In the refining finishing stage, the liquid level of the molten steel is relatively calm, the alloy is completely melted, no bubbles are emitted, and the molten steel is not splashed. The later stage of the refining stage is named according to the alloy smelting process, and the stage that the molten steel is about to be cast after the refining is nearly finished and the alloying is finished
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The controlled rolling process of the deformed high-temperature alloy GH3044 plate structure is characterized by comprising the following steps of:
1) vacuum induction melting: putting raw materials prepared according to the standard proportion of each metal element of the GH3044 material into an alumina crucible of a vacuum induction furnace, and carrying out vacuum induction melting to prepare an electrode ingot;
2) electroslag remelting: CaF is adopted for the electrode ingot prepared by vacuum induction melting2：Al2O3Carrying out electroslag remelting on the binary slag system to form an electroslag ingot;
3) forging a plate blank: forging the GH3044 electroslag ingot into a plate blank with the thickness of 30-50 mm, wherein the forging heating temperature is 1170 +/-20 ℃, and the finish forging temperature is not lower than 930 ℃;
4) machining: machining the GH3044 alloy plate blank after forging, wherein the surface roughness range of the machined plate blank is 20-50 mu m;
5) ultrasonic flaw detection: performing ultrasonic flaw detection on the machined GH3044 alloy plate blank, wherein the diameter of a flat-bottom hole for flaw detection is 1.2 mm;
6) and (3) carrying out precise hot rolling under the condition of structure control: hot rolling the GH3044 alloy plate blank subjected to ultrasonic flaw detection by adopting a rolling method with multiple fire times and large deformation;
7) and (3) heat treatment: carrying out solution heat treatment on the hot-rolled GH3044 alloy plate by adopting a high-temperature precision heat treatment furnace, wherein the solution heat treatment temperature is 1150 +/-10 ℃, keeping the temperature of the center of the plate for 5-20 min after the temperature of the center of the plate is raised, and cooling after the heat treatment is finished;
8) and (5) inspecting the finished product to be qualified.
2. The controlled rolling process of the deformed superalloy GH3044 plate structure of claim 1, wherein the controlled rolling process comprises the following steps: in the step 1), the GH3044 material is prepared from the following metal elements according to the standard mixture ratio by weight percent: c is less than or equal to 0.10, and Cr is 23.5-26.5; w: 13.0 to 16.0; ti: 0.3 to 0.7; mo is less than or equal to 1.50; al is less than or equal to 0.50; fe is less than or equal to 4.0; mn is less than or equal to 0.50; si is less than or equal to 0.80; p is less than or equal to 0.013; s is less than or equal to 0.013; ni: and (4) the balance.
3. The controlled rolling process of the deformed superalloy GH3044 plate structure of claim 1, wherein the controlled rolling process comprises the following steps: in the step 1), the vacuum induction melting comprises a melting stage, an alloying stage, a refining stage and a casting stage, wherein the molten steel temperature control range of the refining stage is 1550 +/-20 ℃, and the refining time is 20-30 min; the casting temperature control range in the casting stage is 1470 +/-20 ℃; the vacuum degree of the alloying stage and the refining stage is 0.01 Pa-0.1 Pa; the temperature range of the melting stage and the alloying stage is 1480-1580 ℃, and the pressure range in the furnace of the melting stage is 0.5-1 Pa; and (3) uniformly dividing the total amount of the metal element Ti according to the adding times, and adding the metal element Ti in batches by a feeder at the later stage of the refining stage.
4. The controlled rolling process of the deformed superalloy GH3044 plate structure of claim 1, wherein the controlled rolling process comprises the following steps: in the step 2), the binary slag system CaF2：Al2O370%: 30 percent, and the smelting speed is stably kept between 3Kg/min and 8Kg/min by controlling the current in the electroslag remelting process.
5. The controlled rolling process of the deformed superalloy GH3044 plate structure of claim 1, wherein the controlled rolling process comprises the following steps: in the step 6), the rolling method with multiple heating times and large deformation is adopted, the initial rolling temperature is 1150 +/-10 ℃, the deformation of each pass is not lower than 25%, the rolling pass is not more than 5, and the control range of the final rolling temperature is 960-1020 ℃.
6. The controlled rolling process of the deformed superalloy GH3044 plate structure of claim 1, wherein the controlled rolling process comprises the following steps: in the step 7), the heating rate of the heat-treated plate is 0.5 min/mm-1.0 min/mm.
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