Preparation method of GH4169 high-temperature alloy cake blank

Abstract

The invention discloses a preparation method of a GH4169 high-temperature alloy cake blank. The preparation method comprises the specific steps that 1, a GH4169 alloy cast ingot is obtained through smelting by adopting a vacuum induction smelting and electroslag remelting dual smelting technology; 2, the GH4169 alloy cast ingot obtained in the step 1 is subjected to annealing heat treatment; 3, the GH4169 alloy cast ingot treated in the step 2 is subjected to 3-4 heating number continuous remelting upsetting and drawing cogging forging in an 80MN fast forging machine, and a blank is obtained; 4, the blank obtained in the step 3 is subjected to homogenizing heat treatment; 5, the blank treated in the step 4 is subjected to 2-3 heating number upsetting and rolling deformation treatment in a 80MN fast forging machine; and 6, the blank treated in the step 5 is subjected to 2-3 heating number upsetting and 1 heating number rounding forming on an 80MN fast forging machine, and the GH4169 high-temperature alloy cake blank is obtained. The method provided by the invention solves the problems of non-uniform structure and poor high-direction mechanical property of the cake blank prepared by the existing method.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a method for preparing a GH4169 high-temperature alloy cake blank. Background Art GH4169 alloy is a high-temperature alloy material commonly used in aircraft engines and gas turbines, accounting for more than 50% of the total output of deformed high-temperature alloys. The alloy has excellent corrosion resistance and welding properties, good room temperature and high temperature properties, and can withstand the extremely harsh service environment of aircraft engines at high speeds.

[0002] In recent years, high-thrust aircraft engines have developed rapidly, and the engine speed has increased significantly, which has put higher and higher requirements on the strength of high-temperature alloy wheels and billet forgings. However, due to the large differences in strain and temperature at different positions of traditional high-temperature alloy billets, it is easy to cause uneven organization. At the same time, due to the upsetting deformation of the billet, the mechanical properties in different load-bearing directions vary greatly, resulting in significantly low high-axis mechanical properties of the billet, which has a great impact on the stability of aircraft engines. Therefore, it is urgent to develop a preparation process for high-strength and high-stability GH4169 alloy billet forgings. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a GH4169 high-temperature alloy billet, so as to solve the problems of uneven structure and poor high-axis mechanical properties of billets prepared by the existing method.

[0004] The technical solution adopted by the present invention is a method for preparing a GH4169 high temperature alloy cake blank, which is specifically implemented according to the following steps: Step 1, using a dual smelting process of vacuum induction melting and electroslag remelting to obtain a GH4169 alloy ingot; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment; Step 3, subjecting the GH4169 alloy ingot processed in step 2 to continuous re-melting, upsetting and forging in an 80MN fast forging machine for 3 to 4 times to obtain a billet; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment; Step 5, subjecting the blank processed in step 4 to 2-3 times of upsetting and rounding deformation processing in an 80MN fast forging machine; Step 6, the blank processed in step 5 is subjected to 2-3 times of upsetting and 1 time of rounding on an 80MN fast forging machine to obtain a GH4169 high temperature alloy blank. The present invention is also characterized in that: In step 1, the diameter of the GH4169 alloy ingot is 420 mm to 480 mm.

[0005] In step 1, the GH4169 alloy ingot has the following chemical compositions by mass percentage: C 0.005-0.012%, Cr17.0-21.0%, Mo 2.8-3.3%, Al 0.5-0.9%, Ti 0.9-1.3%, Ni 50-55%, Nb 4.8-5.2%, and the remainder is Fe, and the sum of the mass percentages of the above components is 100%.

[0006] In step 2, the annealing heat treatment process is: first, heat to 500°C~600°C, keep warm for 2h~3h, then heat to 1140°C~1160°C at a heating rate of 1°C / min~2°C / min, keep warm for 8h~12h, and then air cool.

[0007] In step 3, the deformation amount per fire is 15%~25%; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1120°C~1140°C at 3°C / min~5°C / min, with a thermal insulation coefficient of 0.6 min / mm, and continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging.

[0008] In step 4, the process of homogenization heat treatment is: firstly, heating to 1060°C-1100°C, keeping temperature for 2h-3h, then heating to 1200°C-1210°C, keeping temperature for 15h-18h, and then air cooling.

[0009] In step 5, the upsetting deformation of each fire is 40%~60%, and the rounding deformation of each fire is 15%~25%; The process of upsetting and rounding deformation treatment is as follows: heat the billet treated in step 4 to 700°C with a thermal insulation coefficient of 0.6min / mm, then heat it to 1060°C~1090°C at a heating rate of 5°C / min~10°C / min, with a thermal insulation coefficient of 0.6min / mm, and return the hot material to the furnace with a thermal insulation coefficient of 0.3min / mm. After forging, cover it with asbestos and cool it slowly.

[0010] In step 6, the upsetting deformation is 20%~45% and the rolling deformation is 10%~15% for each fire. The process of upsetting and rounding treatment is as follows: the billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, then heated to 980°C~1010°C at a heating rate of 5°C / min~10°C / min, with a thermal insulation coefficient of 0.6min / mm, and the thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm, and air-cooled after forging is completed.

[0011] The beneficial effects of the present invention are: (1) The preparation method of the GH4169 high-temperature alloy cake blank of the present invention adopts a two-step smelting process of vacuum induction melting + electroslag remelting to smelt the ingot, and the ingot has light segregation and uniform distribution of inclusions, thereby saving production costs; (2) The preparation method of the GH4169 high-temperature alloy billet of the present invention adopts free forging process control to control the grain size of the GH4169 high-temperature alloy billet at the level of grade 8 grain size, and the mechanical properties of the billet are stable in different directions; (3) The preparation method of the GH4169 high-temperature alloy blank of the present invention meets the requirements of high-thrust aircraft engines for GH4169 high-temperature alloy blank forgings, and has excellent mechanical properties at 650°C and below. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the high-magnification structure at the center of the cake obtained in Example 1 of the present invention; Figure 2 This is the high-magnification structure at the edge of the cake blank obtained in Example 1 of the present invention. DETAILED DESCRIPTION

[0013] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] The method for preparing the GH4169 high temperature alloy cake blank of the present invention is specifically implemented according to the following steps: Step 1, using vacuum induction melting and electroslag remelting double smelting process to smelt GH4169 alloy ingots, the diameter of the GH4169 alloy ingot is 420 mm to 480 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.005~0.012%, Cr 17.0~21.0%, Mo 2.8~3.3%, Al 0.5~0.9%, Ti 0.9~1.3%, Ni 50~55%, the sum of Nb and Ta is 4.8~5.2%, the balance is Fe, and the sum of the above components by mass percentage is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment; The annealing heat treatment process is: First, heat to 500℃~600℃, keep warm for 2h~3h, then heat to 1140℃~1160℃ at a heating rate of 1℃ / min~2℃ / min, keep warm for 8h~12h, and then air cool; Step 3, the GH4169 alloy ingot processed in step 2 is subjected to 3-4 fires of continuous remelting, upsetting and forging in an 80MN fast forging machine, with a deformation amount of 15%-25% in each fire, to obtain a billet; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1120°C~1140°C at 3°C / min~5°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment; The process of homogenization heat treatment is: First, heat up to 1060℃~1100℃, keep warm for 2h~3h, then heat up to 1200℃~1210℃, keep warm for 15h~18h, then air cool; Step 5, the blank processed in step 4 is subjected to 2-3 times of upsetting and rolling deformation treatment in an 80MN fast forging machine, with the upsetting deformation amount of each time being 40%-60% and the rolling deformation amount of each time being 15%-25%; The process of upsetting and rounding deformation treatment is: Heat the billet after step 4 to 700℃, with a thermal insulation coefficient of 0.6min / mm, then heat it to 1060℃~1090℃ at a heating rate of 5℃ / min~10℃ / min, with a thermal insulation coefficient of 0.6min / mm, and return the hot material to the furnace with a thermal insulation coefficient of 0.3min / mm. After forging, cover it with asbestos and slowly cool it; Step 6, the blank processed in step 5 is subjected to 2-3 times of upsetting and 1 time of rounding on an 80MN fast forging machine, with the upsetting deformation amount of each time being 20%-45% and the rounding deformation amount being 10%-15%, to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6 min / mm, and then heated to 980°C~1010°C at a heating rate of 5°C / min~10°C / min with a thermal insulation coefficient of 0.6 min / mm. The thermal insulation coefficient of the hot material returned to the furnace is 0.3 min / mm, and air-cooled after forging is completed.

[0015] Example 1 Step 1, using a dual smelting process of vacuum induction melting and electroslag remelting to obtain a GH4169 alloy ingot, the diameter of the GH4169 alloy ingot is 480 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.012%, Cr 20.0%, Mo3.0%, Al 0.8%, Ti 1.15%, Ni 52%, Nb+Ta 4.8%, and the balance is Fe. The sum of the mass percentages of the above components is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment in a natural gas furnace; The annealing heat treatment process is: First, the furnace temperature is raised to 500℃ and the materials are put into the furnace. The temperature is kept at this temperature for 3 hours. Then, the temperature is raised to 1140℃ at a heating rate of 1℃ / min and the temperature is kept at this temperature for 12 hours. Then, the furnace is air-cooled. Step 3, the GH4169 alloy ingot processed in step 2 is subjected to three-time continuous remelting, upsetting and forging in an 80MN fast forging machine, and the deformation of the GH4169 alloy ingot is set as follows: Φ480×900→Φ520×765→Φ450×1020→Φ390×1360, to obtain a billet; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1120°C at 3°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment in a natural gas furnace; The process of homogenization heat treatment is: First, the furnace temperature was raised to 1060°C and kept at this temperature for 2 hours, then raised to 1200°C and kept at this temperature for 15 hours, and then air-cooled; Step 5, the blank processed in step 4 is subjected to three-time upsetting and rounding deformation treatments in an 80MN fast forging machine, and the deformation settings are as follows: Φ390×1360→Φ480×900 (upsetting, rounding)→Φ620×540 (upsetting, rounding)→Φ800×325 (upsetting, rounding); The process of upsetting and rounding deformation treatment is: The blank treated in step 4 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1060°C at a heating rate of 5°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material is 0.3min / mm when it is returned to the furnace. After forging, it is covered with asbestos and slowly cooled; Step 6, the blank processed in step 5 is subjected to two upsetting and one rounding on an 80MN fast forging machine, and the deformation setting is as follows: Φ800×325→Φ895×260 (upsetting)→Φ1020×200 (upsetting)→Φ960×225 (rounding), to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, then heated to 980°C at a heating rate of 5°C / min with a thermal insulation coefficient of 0.6min / mm, and the thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm. After forging, it is air-cooled.

[0016] The grain size of the GH4169 high-temperature alloy blank obtained in this embodiment reaches grade 9 according to GB / T 6394.

[0017] Example 2 Step 1, using vacuum induction melting and electroslag remelting double smelting process to smelt GH4169 alloy ingot, the diameter of the GH4169 alloy ingot is 420 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.005%, Cr 17.0%, Mo2.8%, Al 0.5%, Ti 0.9%, Ni 55%, Nb+Ta 5.2%, and the balance is Fe, and the sum of the mass percentages of the above components is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment in a natural gas furnace; The annealing heat treatment process is: First, the furnace temperature is raised to 600℃ and the materials are put into the furnace, and the temperature is kept for 2 hours. Then the temperature is raised to 1160℃ at a heating rate of 2℃ / min, and the temperature is kept for 8 hours, followed by air cooling. Step 3, the GH4169 alloy ingot processed in step 2 is subjected to three-time continuous remelting, upsetting and forging in an 80MN fast forging machine, and the deformation of the GH4169 alloy ingot is set as follows: Φ420×1175→Φ485×880→Φ445×1035→Φ410×1220, to obtain a billet; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1140°C at 5°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment in a natural gas furnace; The process of homogenization heat treatment is: First, the furnace temperature was raised to 1100°C and kept at this temperature for 3 hours, then raised to 1210°C and kept at this temperature for 18 hours, and then air-cooled; Step 5, the blank processed in step 4 is subjected to three-time upsetting and rounding deformation treatments in an 80MN fast forging machine, and the deformation settings are as follows: Φ410×1220→Φ550×670 (upsetting, rounding)→Φ600×570 (upsetting, rounding)→Φ650×485 (upsetting, rounding); The process of upsetting and rounding deformation treatment is: The blank treated in step 4 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1090°C at a heating rate of 10°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material is 0.3min / mm when it is returned to the furnace. After forging, it is covered with asbestos and slowly cooled; Step 6, the blank processed in step 5 is subjected to two upsetting and one rounding forming on an 80MN fast forging machine, and the deformation setting is as follows: Φ650×485→Φ880×265 (upsetting)→Φ985×210 (upsetting)→Φ915×245 (rounding), to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, then heated to 1010°C at a heating rate of 10°C / min with a thermal insulation coefficient of 0.6min / mm, and the thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm. After forging, it is air-cooled.

[0018] The grain size of the GH4169 high-temperature alloy cake obtained in this embodiment reaches grade 8 according to GB / T 6394.

[0019] Example 3 Step 1, using a dual smelting process of vacuum induction melting and electroslag remelting to smelt a GH4169 alloy ingot, the diameter of the GH4169 alloy ingot is 450 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.008%, Cr 21.0%, Mo3.3%, Al 0.9%, Ti 1.3%, Ni 50%, Nb+Ta 5.0%, and the balance is Fe. The sum of the mass percentages of the above components is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment in a natural gas furnace; The annealing heat treatment process is: First, the furnace temperature is raised to 550℃ and the materials are put into the furnace, and the temperature is kept for 2.5 hours. Then the temperature is raised to 1150℃ at a heating rate of 2℃ / min, and the temperature is kept for 10 hours, followed by air cooling. Step 3, the GH4169 alloy ingot processed in step 2 is subjected to 4-time continuous remelting, upsetting and forging in an 80MN fast forging machine, and the deformation of the GH4169 alloy ingot is set as follows: Φ450×1025→Φ490×870→Φ450×1025→Φ490×870→Φ425×1160, to obtain a billet; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1130°C at 5°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment in a natural gas furnace; The process of homogenization heat treatment is: First, the furnace temperature is raised to 1080°C and kept at this temperature for 2 hours, then raised to 1210°C and kept at this temperature for 16 hours, followed by air cooling; Step 5, the blank processed in step 4 is subjected to two-time upsetting and rounding deformation treatments in an 80MN fast forging machine, and the deformation setting is as follows: Φ425×1160→Φ570×640 (upsetting, rounding)→Φ620×545 (upsetting, rounding); The process of upsetting and rounding deformation treatment is: The blank treated in step 4 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1080°C at a heating rate of 5°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material is 0.3min / mm when it is returned to the furnace. After forging, it is covered with asbestos and slowly cooled; Step 6, the blank processed in step 5 is subjected to 3 times of upsetting and 1 time of rounding on an 80MN fast forging machine, and the deformation setting is as follows: Φ620×545→Φ835×300 (upsetting)→Φ930×240 (upsetting)→Φ1050×190 (upsetting)→Φ960×225 (rounding), to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 treatment is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1000°C at a heating rate of 5°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm, and air-cooled after forging is completed.

[0020] The grain size of the GH4169 high-temperature alloy blank obtained in this embodiment reaches grade 10 according to GB / T 6394.

[0021] Example 4 Step 1, using vacuum induction melting and electroslag remelting double smelting process to smelt GH4169 alloy ingot, the diameter of the GH4169 alloy ingot is 480 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.010%, Cr 21.0%, Mo3.0%, Al 0.7%, Ti 1.2%, Ni 52%, Nb+Ta 5.0%, and the balance is Fe. The sum of the mass percentages of the above components is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment in a natural gas furnace; The annealing heat treatment process is: First, the furnace temperature is raised to 500℃ and the materials are put into the furnace, and the temperature is kept for 3 hours. Then, the temperature is raised to 1160℃ at a heating rate of 1.5℃ / min, and the temperature is kept for 10 hours, followed by air cooling. Step 3, the GH4169 alloy ingot processed in step 2 is subjected to three-time continuous remelting, upsetting and forging in an 80MN fast forging machine, and the deformation of the GH4169 alloy ingot is set as follows: Φ480×900→Φ520×765→Φ450×1020→Φ390×1360, to obtain a billet; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1120°C at 4°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment in a natural gas furnace; The process of homogenization heat treatment is: First, the furnace temperature is raised to 1060°C and kept at this temperature for 2.5 hours, then raised to 1205°C and kept at this temperature for 17 hours, followed by air cooling; Step 5, the blank processed in step 4 is subjected to three-time upsetting and rounding deformation treatments in an 80MN fast forging machine, and the deformation settings are as follows: Φ390×1360 →Φ480×900 (upsetting, rounding) →Φ620×540 (upsetting, rounding) →Φ800×325 (upsetting, rounding); The process of upsetting and rounding deformation treatment is: The blank treated in step 4 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1090°C at a heating rate of 8°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material is 0.3min / mm when it is returned to the furnace. After forging, it is covered with asbestos and slowly cooled; Step 6, the blank processed in step 5 is subjected to two upsetting and one rounding on an 80MN fast forging machine, and the deformation setting is as follows: Φ800×325→Φ895×260 (upsetting)→Φ1020×200 (upsetting)→Φ960×225 (rounding), to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 treatment is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1000°C at a heating rate of 8°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm, and air-cooled after forging is completed.

[0022] Example 5 Step 1, using vacuum induction melting and electroslag remelting double smelting process to smelt GH4169 alloy ingot, the diameter of the GH4169 alloy ingot is 420 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.005%, Cr 17.0%, Mo3.0%, Al 0.6%, Ti 0.9%, Ni 54%, Nb+Ta 5.1%, and the balance is Fe, and the sum of the mass percentages of the above components is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment in a natural gas furnace; The annealing heat treatment process is: First, the furnace temperature is raised to 600℃ and the materials are put into the furnace, and the temperature is kept for 2 hours. Then the temperature is raised to 1150℃ at a heating rate of 1.5℃ / min, and the temperature is kept for 10 hours, followed by air cooling. Step 3, the GH4169 alloy ingot processed in step 2 is subjected to three-time continuous remelting, upsetting and forging in an 80MN fast forging machine, and the deformation of the GH4169 alloy ingot is set as follows: Φ420×1175→Φ485×880→Φ445×1035→Φ410×1220, to obtain a billet; The process of upsetting and drawing the billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1140°C at 4°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment in a natural gas furnace; The process of homogenization heat treatment is: First, the furnace temperature was raised to 1100°C and kept at this temperature for 2.5 hours, then raised to 1205°C and kept at this temperature for 17 hours, and then air-cooled; Step 5, the blank processed in step 4 is subjected to three-time upsetting and rounding deformation treatments in an 80MN fast forging machine, and the deformation settings are as follows: Φ410×1220→Φ550×670 (upsetting, rounding)→Φ600×570 (upsetting, rounding)→Φ650×485 (upsetting, rounding); The process of upsetting and rounding deformation treatment is: The blank treated in step 4 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1090°C at a heating rate of 7°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material is 0.3min / mm when it is returned to the furnace. After forging, it is covered with asbestos and slowly cooled; Step 6, the blank processed in step 5 is subjected to two upsetting and one rounding on an 80MN fast forging machine, and the deformation setting is as follows: Φ650×485→Φ880×265 (upsetting)→Φ985×210 (upsetting)→Φ915×245 (rounding), to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6 min / mm, then heated to 1010°C at a heating rate of 7°C / min with a thermal insulation coefficient of 0.6 min / mm, and the thermal insulation coefficient of the hot material returned to the furnace is 0.3 min / mm. After forging, it is air-cooled.

[0023] Example 6 Step 1, using a dual smelting process of vacuum induction melting and electroslag remelting to smelt a GH4169 alloy ingot, the diameter of the GH4169 alloy ingot is 450 mm; Among them, the chemical composition of GH4169 alloy ingot is as follows by mass percentage: C 0.01%, Cr 21.0%, Mo3.3%, Al 0.9%, Ti 1.2%, Ni 50%, Nb+Ta 5.0%, the balance is Fe, and the sum of the mass percentages of the above components is 100%; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment in a natural gas furnace; The annealing heat treatment process is: First, the furnace temperature is raised to 550℃ and the materials are put into the furnace, and the temperature is kept for 3 hours. Then the temperature is raised to 1150℃ at a heating rate of 2℃ / min, and the temperature is kept for 10 hours, followed by air cooling. Step 3, the GH4169 alloy ingot processed in step 2 is subjected to 4-time continuous remelting, upsetting and forging in an 80MN fast forging machine, and the deformation of the GH4169 alloy ingot is set as follows: Φ450×1025→Φ490×870→Φ450×1025→Φ490×870→Φ425×1160, to obtain a billet; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1130°C at 4°C / min with a thermal insulation coefficient of 0.6 min / mm, continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment in a natural gas furnace; The process of homogenization heat treatment is: First, the furnace temperature is raised to 1080°C and kept at this temperature for 2 hours, then raised to 1210°C and kept at this temperature for 16 hours, followed by air cooling; Step 5, the blank processed in step 4 is subjected to two-time upsetting and rounding deformation treatments in an 80MN fast forging machine, and the deformation setting is as follows: Φ425×1160→Φ570×640 (upsetting, rounding)→Φ620×545 (upsetting, rounding); The process of upsetting and rounding deformation treatment is: The blank treated in step 4 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, and then heated to 1080°C at a heating rate of 8°C / min with a thermal insulation coefficient of 0.6min / mm. The thermal insulation coefficient of the hot material is 0.3min / mm when it is returned to the furnace. After forging, it is covered with asbestos and slowly cooled; Step 6, the blank processed in step 5 is subjected to 3 times of upsetting and 1 time of rounding on an 80MN fast forging machine, and the deformation setting is as follows: Φ620×545→Φ835×300 (upsetting)→Φ930×240 (upsetting)→Φ1050×190 (upsetting)→Φ960×225 (rounding), to obtain a GH4169 high temperature alloy blank; The process of upsetting and rounding is as follows: The billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, then heated to 1010°C at a heating rate of 8°C / min with a thermal insulation coefficient of 0.6min / mm, and the thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm. After forging, it is air-cooled.

[0024] Performance Testing: The room temperature tensile properties and 650°C high temperature tensile properties of the GH4169 high temperature alloy cakes obtained in Examples 1 to 3 were tested, wherein the room temperature tensile test was conducted at room temperature using the national standard GB / T 228.1. The high temperature tensile test was conducted at 650°C for 20 minutes using the national standard GB / T 228.2. The specific test results are shown in Table 1.

[0025] Table 1

[0026] like Figure 1 and Figure 2 As shown, the microstructure of the GH4169 high-temperature alloy cake obtained in Example 1 of the present invention is relatively uniform both at the center and at the edge.

Claims

1. A method for preparing GH4169 high temperature alloy cake blank, characterized in that: Follow the steps below to implement it: Step 1, using a dual smelting process of vacuum induction melting and electroslag remelting to obtain a GH4169 alloy ingot; Step 2, subjecting the GH4169 alloy ingot obtained in step 1 to annealing heat treatment; Step 3, subjecting the GH4169 alloy ingot processed in step 2 to continuous re-melting, upsetting and forging in an 80MN fast forging machine for 3 to 4 times to obtain a billet; Step 4, subjecting the blank obtained in step 3 to homogenization heat treatment; Step 5, subjecting the blank processed in step 4 to 2-3 times of upsetting and rounding deformation processing in an 80MN fast forging machine; Step 6, the blank processed in step 5 is subjected to 2-3 times of upsetting and 1 time of rounding on an 80MN fast forging machine to obtain a GH4169 high temperature alloy blank.

2. The method for preparing the GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 1, the diameter of the GH4169 alloy ingot is 420 mm to 480 mm.

3. The method for preparing the GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 1, the GH4169 alloy ingot has the following chemical compositions by mass percentage: C 0.005-0.012%, Cr 17.0-21.0%, Mo 2.8-3.3%, Al 0.5-0.9%, Ti 0.9-1.3%, Ni 50-55%, Nb 4.8-5.2%, and the remainder is Fe, and the sum of the mass percentages of the above components is 100%.

4. The method for preparing the GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 2, the annealing heat treatment process is: first, heat to 500°C~600°C, keep warm for 2h~3h, then heat to 1140°C~1160°C at a heating rate of 1°C / min~2°C / min, keep warm for 8h~12h, and then air cool.

5. The method for preparing GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 3, the deformation amount per fire is 15%~25%; The process of upsetting and drawing billet forging is as follows: heating the GH4169 alloy ingot treated in step 2 to 500°C with a thermal insulation coefficient of 0.6 min / mm, then heating to 1120°C~1140°C at 3°C / min~5°C / min, with a thermal insulation coefficient of 0.6 min / mm, and continuously returning the hot material to the furnace with a thermal insulation coefficient of 0.3 min / mm, and air cooling after forging.

6. The method for preparing GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 4, the process of homogenization heat treatment is: firstly, heating to 1060°C-1100°C, keeping temperature for 2h-3h, then heating to 1200°C-1210°C, keeping temperature for 15h-18h, and then air cooling.

7. The method for preparing GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 5, the upsetting deformation of each fire is 40%~60%, and the rounding deformation of each fire is 15%~25%; The process of upsetting and rounding deformation treatment is as follows: heat the billet treated in step 4 to 700°C with a thermal insulation coefficient of 0.6min / mm, then heat it to 1060°C~1090°C at a heating rate of 5°C / min~10°C / min, with a thermal insulation coefficient of 0.6min / mm, and return the hot material to the furnace with a thermal insulation coefficient of 0.3min / mm. After forging, cover it with asbestos and cool it slowly.

8. The method for preparing GH4169 high temperature alloy cake blank according to claim 1, characterized in that: In step 6, the upsetting deformation is 20%~45% and the rolling deformation is 10%~15% for each fire. The process of upsetting and rounding treatment is as follows: the billet after step 5 is heated to 700°C with a thermal insulation coefficient of 0.6min / mm, then heated to 980°C~1010°C at a heating rate of 5°C / min~10°C / min, with a thermal insulation coefficient of 0.6min / mm, and the thermal insulation coefficient of the hot material returned to the furnace is 0.3min / mm, and air-cooled after forging is completed.

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