CN109590421B - Forging process of Hastelloy C-276 - Google Patents
Forging process of Hastelloy C-276 Download PDFInfo
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- CN109590421B CN109590421B CN201811580867.3A CN201811580867A CN109590421B CN 109590421 B CN109590421 B CN 109590421B CN 201811580867 A CN201811580867 A CN 201811580867A CN 109590421 B CN109590421 B CN 109590421B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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Abstract
The invention discloses a forging process of hastelloy C-276, which comprises the steps of heat treatment before forging, heating and forging; the pre-forging heat treatment process comprises the following steps: heating the alloy material to 980-1020 ℃, and preserving heat for 1-1.5 h; heating to 1080-1120 ℃ again, and preserving heat for 15-16 h; discharging and air cooling; the heating process comprises the following steps: heating the alloy material to 980-1020 ℃, and preserving heat for 1-1.5 h; then heating to 1140-1160 ℃, and preserving heat for 5-6 h; the forging process comprises the following steps: the method adopts multi-fire forging, a temperature compensation device of a forging press is adopted for heating during forging, and the finish forging temperature of each fire is controlled to be 1000 ℃ or above. The process can dissolve the precipitated phase in the hastelloy C-276 back through a heat treatment process, reduces grain boundary embrittlement phases and eliminates forging cracking caused by the weakening of the grain boundary; in the forging process, a temperature compensation device is used for carrying out temperature compensation on the material, and the retention time of the blank in the forging temperature interval is prolonged, so that the forging time of each firing time is increased.
Description
Technical Field
The invention relates to a metal forging process, in particular to a forging process of hastelloy C-276C.
Background
Hastelloy C-276C is an important member of nickel-based alloy, has super-strong corrosion resistance due to containing a large amount of nickel, chromium, molybdenum and tungsten elements, has strong corrosion resistance in oxidizing and reducing media, and simultaneously has good mechanical properties, and is called as corrosion resistance king. The hastelloy C-276 is suitable for corrosion environments in a plurality of fields such as chemical manufacturing, power plant flue gas desulfurization, papermaking, oceans and the like; therefore, it is also called as one of the most widely used nickel-based corrosion resistant alloys. The hastelloy C-276 has a wide application market, but the production of the hastelloy C-276 is severely limited, and one important factor is the hot working of the hastelloy C-276. In the hot forging process of the hastelloy C-276, because the forging temperature window is small, the optimal temperature range is 1000-1150 ℃, when the temperature is lower than the temperature range, a precipitated phase can be rapidly generated at a grain boundary, so that the grain boundary is embrittled, the thermoplasticity of the material is reduced, and the forging cracking phenomenon can occur if carelessness is performed, so that the production progress and the yield of the material are seriously influenced. How to avoid the reduction of high-temperature plasticity and the temperature reduction in the forging process caused by the occurrence of precipitated phases becomes an important factor for limiting the forging processing of the Hastelloy C-276.
Disclosure of Invention
The invention aims to provide a forging process of Hastelloy C-276, which can effectively avoid grain boundary embrittlement.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: it comprises the processes of heat treatment before forging, heating and forging; the pre-forging heat treatment process comprises the following steps: heating the alloy material to 980-1020 ℃, and preserving heat for 1-1.5 h; heating to 1080-1120 ℃ again, and preserving heat for 15-16 h; discharging and air cooling;
the heating process comprises the following steps: heating the alloy material to 980-1020 ℃, and preserving heat for 1-1.5 h; then heating to 1140-1160 ℃, and preserving heat for 5-6 h;
the forging process comprises the following steps: the method adopts multi-fire forging, a temperature compensation device of a forging press is adopted for heating during forging, and the finish forging temperature of each fire is controlled to be 1000 ℃ or above.
In the pre-forging heat treatment process, the temperature of the alloy material is raised to 980-1020 ℃ at 200-300 ℃/h.
In the pre-forging heat treatment process, the temperature of the alloy material is raised to 1080-1120 ℃ at a speed of 80-100 ℃/h.
In the forging process, the blank after forging and pressing each time is returned to the furnace for supplementing the temperature, and the temperature is kept at 1140-1160 ℃ for 50-60 min.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: through the heat treatment process, the precipitated phase in the hastelloy C-276 can be redissolved, the grain boundary embrittlement phase is reduced, and the forging cracking caused by the weakening of the grain boundary is eliminated; the temperature compensation device is used for compensating the temperature of the material in the forging process, and the retention time of the blank in the forging temperature interval is prolonged, so that the forging time of each heating time is increased, the embrittlement of a crystal boundary can be further effectively avoided, the forging heating time can be reduced, labor force is liberated, the forging time is saved, the working time of a heating furnace is shortened, the production cost is reduced, and the production and processing efficiency is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of a temperature compensating device according to the present invention;
FIG. 2 is a schematic view of the distribution of flame nozzles on both sides of a blank in the temperature compensating device of the present invention;
FIG. 3 is a microstructure view of a forged product of example 1 of the present invention;
FIG. 4 is a microstructure view of a forged product of example 2 of the present invention;
FIG. 5 is a microstructure view of a forged product of example 3 of the present invention.
In the figure: the device comprises a flame nozzle 1, an air guide pipe 2, a strong magnet 3, a forging press base 4, an air bottle 5 and a blank 6.
Detailed Description
The forging process of the hastelloy C-276 comprises the processes of heat treatment before forging and forging; the process of each process is as follows: (1) the hastelloy C-276 comprises the following components in percentage by weight: 4.0 to 7.0 percent of Fe, 14.5 to 16.5 percent of Cr, 15 to 17 percent of Mo, 3 to 4.5 percent of W, 0.3 to 0.7 percent of Mn, less than or equal to 0.01 percent of C, less than or equal to 0.08 percent of Si, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, and the balance of Ni.
(2) Heat treatment before forging: firstly, the surface needs to be scalped, so that the influence of the surface quality problem on forging is eliminated; before forging, the blank is subjected to heat treatment: heating to 980-1020 ℃ at a heating rate of 200-300 ℃/h, and preserving heat for 1-1.5 h; heating to 1080-1120 ℃ at the speed of 80-100 ℃/h, and preserving heat for 15-16 h; taking out the product from the furnace and air-cooling to room temperature.
(3) Heating: before forging, the hastelloy C-276 is placed into a heating furnace in front of a forging press for heating, the temperature is raised to 980-1020 ℃ at the heating rate of 200-300 ℃/h, and the temperature is kept for 1-1.5 h; and then heating to 1140-1160 ℃ at the speed of 80-100 ℃/h, and preserving heat for 5-6 h to ensure that the blank is thoroughly heated.
(4) Forging: the blank after thorough heating enters a forging press for forging and pressing, a multi-fire forging mode is adopted, and the final forging temperature of each fire is controlled to be 1000 ℃ or above; namely, when the temperature of the forge piece is reduced to 1000 ℃ during forging or soon, the forge piece is taken out and put into a heating furnace, and the forge piece is re-heated in the heating furnace for temperature compensation; when the temperature is compensated, the blank is kept at 1140-1160 ℃ for 50-60 min.
And during forging, the temperature of the blank is compensated by using a temperature compensating device. The temperature compensation device adopts the following structure: fig. 1 and 2 show that the forging press comprises a forging press base 4 and a heating device, wherein the heating device comprises a gas cylinder 5, a pressure gauge, a gas valve, a gas guide tube 2 and a flame nozzle 1, and common combustible gases such as natural gas, propane and the like are filled in the gas cylinder. The flame nozzle 1 is adsorbed on two sides of an anvil block at the bottom of the forging press through a strong magnet 3; preferably, four flame nozzles 1 are provided, and two flame nozzles are attached to both sides of the anvil. The heating mode is flame heating, and a heat source is provided by burning common combustible gas such as natural gas, propane and the like. In the forging process, the angle and the position of the nozzle are determined by adjusting the strong magnet according to the shape and the size of a forging stock, and the angle of the nozzle can be flexibly changed within the range of 0-180 degrees. According to the temperature and temperature drop condition required by the forging stock, the gas valve carried by the gas cylinder is controlled to adjust the flame power, and the flame power can be flexibly adjusted within the range of 4L/min-25L/min. The compensation temperature is controlled according to the principle that the temperature drops quickly and then flows at a high rate for a long time. The temperature compensation device with the structure can adjust the position of the flame nozzle according to the position of the forging with higher temperature drop rate, and perform local targeted temperature compensation on the part with the higher temperature drop rate, so as to increase the uniformity of the temperature of the forging; therefore, the internal stress of the forge piece generated by temperature difference can be effectively reduced.
Example 1: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) Hastelloy C-276 electroslag cast ingot with the size of phi 300 multiplied by 500mm and the components (wt): 5.32% of Fe, 16.23% of Cr, 16.45% of Mo, 3.83% of W, 0.53% of Mn, 0.008% of C, 0.03% of Si, 0.004% of P, 0.003% of S and the balance of Ni.
(2) Firstly, heat treatment is carried out on Hastelloy C-276, the original temperature of a heating furnace is 36 ℃, a program is set, the temperature is increased to 1000 ℃ at the temperature increase rate of 300 ℃/h, and the temperature is kept for 1 h; then heating to 1100 ℃ at the speed of 100 ℃/h, preserving the heat for 15h, discharging and air cooling. Before forging, placing the hastelloy C-276 into a heating furnace before a forging press for heating, raising the temperature to 1000 ℃ at the heating rate of 300 ℃/s, and preserving the heat for 1 h; then the temperature is raised to 1150 ℃ at the heating rate of 100 ℃/s, and the forging is started after the temperature is kept for 5 h.
(3) And during forging, the temperature compensating device is started, and the nozzle is sprayed to the forging stock from four directions. The first fire lasted 4min with a deflection of 40 mm. The temperature of the blank is reduced to 1009 ℃, and the temperature is compensated after the blank is returned to the furnace. Keeping the temperature in the furnace for 50min and then continuing forging. And the second fire lasts for 4min, the deformation is 36mm, the temperature of the blank is reduced to 1005 ℃, the blank is returned to the furnace for temperature compensation, and the forging is continued after the temperature is kept in the furnace for 50 min. At the moment, the blank is already square, and the square corner of the blank is forged firstly during forging, so that the temperature of the corner is prevented from being reduced too fast. And continuing forging, wherein the third fire lasts for 3.5min, the deformation is 34mm, and the forging billet size is about 190mm by 190mm square billet. After the furnace is returned and the temperature is kept for 55min, forging is continued, the fourth fire lasts for 3.5min, the deformation is 35mm, and the finish forging temperature is 1010 ℃. And (4) after the furnace is returned and the temperature is kept for 50min, forging is continued, the fifth fire lasts for 3min, and the blank is forged into a square blank with the size of 140 x 140mm, and then straightening and other finishing operations are carried out. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing the microstructure, as shown in figure 3, the grain size is fine and uniform, and is all 30-50 μm.
Example 2: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) The cast hastelloy C-276 with the size of 150 multiplied by 300mm comprises the following components in percentage by weight: 5.49% of Fe, 15.88% of Cr, 15.85% of Mo, 3.73% of W, 0.50% of Mn, 0.006% of C, 0.05% of Si, 0.005% of P, 0.005% of S and the balance of Ni.
(2) Carrying out heat treatment on the material by using a heating furnace, setting a program at the original temperature of 53 ℃, raising the temperature to 990 ℃ at the temperature rise rate of 250 ℃/h, and keeping the temperature for 1.5 h; then the temperature is raised to 1110 ℃ at the speed of 80 ℃/h, the temperature is kept for 15.5h, and the mixture is discharged from the furnace and cooled in air. Before forging, placing the hastelloy C-276 into a heating furnace before a forging press for heating, raising the temperature to 1010 ℃ at the temperature rise rate of 200 ℃/s, and preserving the heat for 1.2 h; then the temperature is raised to 1160 ℃ at the heating rate of 90 ℃/s, and the forging is started after the temperature is preserved for 5.5 h.
(3) And during forging, the temperature compensating device is started, the nozzle is sprayed to the forging stock from four directions, the air flow rate is controlled to be about 15L/min, and the temperature of the stock is compensated. The first fire lasted 3min with a deflection of 26 mm. The temperature of the blank is reduced to 1007 ℃, and the blank is returned to the furnace for temperature compensation. Keeping the temperature in the furnace for 30min and then continuing forging. The second fire lasts for 2.5min, the deformation is 21mm, the temperature of the blank is reduced to 1000 ℃, the blank is returned to the furnace for supplementing the temperature, and the forging is continued after the temperature is preserved in the furnace for 30 min. And then continuing forging, adjusting the jet flow of the temperature compensation device to be increased to 20L/min, continuing the third fire for 2min, forging the blank to a square blank with the size of 80 multiplied by 80mm, and then straightening and finishing. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing the microstructure, as shown in figure 4, the grain size is fine and uniform, and is all 20-40 μm.
Example 3: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) The cast hastelloy C-276 with the blank size of 150 multiplied by 260mm and the components (wt): 5.69% of Fe, 16.03% of Cr, 16.12% of Mo, 3.92% of W, 0.55% of Mn, 0.008% of C, 0.06% of Si, 0.004% of P, 0.003% of S and the balance of Ni.
(2) Carrying out heat treatment on the material by using a heating furnace, setting a program at the original temperature of 73 ℃, raising the temperature to 1010 ℃ at the temperature rise rate of 200 ℃/h, and keeping the temperature for 1.2 h; then raising the temperature to 1080 ℃ at the speed of 90 ℃/h, preserving the heat for 16h, discharging and air cooling. Before forging, placing the hastelloy C-276 into a heating furnace before a forging press for heating, raising the temperature to 1020 ℃ at the heating rate of 250 ℃/s, and preserving the heat for 1.3 h; then the temperature is raised to 1155 ℃ at the heating rate of 80 ℃/s, and the forging is started after the temperature is kept for 6 h.
(3) And during forging, the temperature compensating device is started, the nozzles are sprayed to the corners of the forging stock from four directions, the air flow is controlled at 15L/min, and the temperature of the stock is compensated. The first fire lasted 3min with a deflection of 26 mm. The temperature of the blank is reduced to 1011 ℃, and the blank is returned to the furnace for temperature compensation. Keeping the temperature in the furnace for 30min and then continuing forging. Adjusting the flow rate of the jet gas to 18L/min during the second fire, keeping the second fire for 2.5min, keeping the deformation amount to 21mm, reducing the temperature of the blank to 1005 ℃, returning to the furnace for supplementing the temperature, keeping the temperature in the furnace for 30min, and then continuing forging. And then continuously forging, keeping the third fire for 2min, forging the blank to a square blank with the size of 80 multiplied by 80mm, and then straightening and finishing. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing the microstructure, as shown in figure 5, the grain size is fine and uniform, and is all 30-40 μm.
Example 4: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) Hastelloy C-276 electroslag cast ingot with the size of phi 300 multiplied by 500mm and the components (wt): 4.0% of Fe, 15.21% of Cr, 15.34% of Mo, 4.5% of W, 0.47% of Mn, 0.004% of C, 0.04% of Si, 0.008% of P, 0.004% of S and the balance of Ni.
(2) Firstly, carrying out heat treatment on Hastelloy C-276, setting a program at an original temperature of 35 ℃ in a heating furnace, raising the temperature to 980 ℃ at a temperature rise rate of 220 ℃/h, and preserving the heat for 1.3 h; then the temperature is raised to 1105 ℃ at the speed of 95 ℃/h, the temperature is kept for 15.5h, and the steel is taken out of the furnace and cooled in air. Before forging, placing the hastelloy C-276 into a heating furnace before a forging press for heating, heating to 1015 ℃ at the heating rate of 220 ℃/s, and preserving heat for 1.5 h; then the temperature is raised to 1145 ℃ at the heating rate of 85 ℃/s, and the forging is started after the temperature is kept for 5.5 h.
(3) The blank after thorough heating enters a forging press for forging and pressing, a multi-fire forging mode is adopted, and the final forging temperature of each fire is controlled to be 1000 ℃ or above; namely, when the temperature of the forge piece is reduced to 1000-1010 ℃ during forging and pressing, taking out the forge piece, putting the forge piece into a heating furnace, and returning the forge piece to the heating furnace for temperature compensation; when the temperature is compensated, the blank is kept at 1140-1150 ℃ for 55 min. The billet is forged into a square billet having a size of 140X 140mm, and then finished by straightening and the like. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing a microstructure, wherein the grain sizes are fine and uniform and are all 30-50 mu m.
Example 5: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) The cast hastelloy C-276 with the size of 150 multiplied by 300mm comprises the following components in percentage by weight: 5.25% of Fe, 16.24% of Cr, 15.0% of Mo, 3.64% of W, 0.38% of Mn, 0.007% of C, 0.08% of Si, 0.006% of P, 0.007% of S and the balance of Ni.
(2) Carrying out heat treatment on the material by using a heating furnace, setting a program at the original temperature of 64 ℃, raising the temperature to 1000 ℃ at the heating rate of 260 ℃/h, and keeping the temperature for 1.2 h; then heating to 1115 ℃ at the speed of 85 ℃/h, preserving heat for 16h, discharging and air cooling. Before forging, the hastelloy C-276 is placed into a heating furnace before a forging press to be heated, the temperature is raised to 995 ℃ at the heating rate of 280 ℃/s, and the heat is preserved for 1.4 h; then the temperature is raised to 1150 ℃ at the heating rate of 90 ℃/s, and the forging is started after the temperature is kept for 5.2 h.
(3) The blank after thorough heating enters a forging press for forging and pressing, a multi-fire forging mode is adopted, and the final forging temperature of each fire is controlled to be 1000 ℃ or above; namely, when the temperature of the forge piece is reduced to 1000-1015 ℃ during forging and pressing, taking out the forge piece, putting the forge piece into a heating furnace, and returning the forge piece to the heating furnace for temperature compensation; when the temperature is compensated, the blank is kept at 1150-1160 ℃ for 58 min. The billet is forged into a square billet with the size of 80X 80mm, and then straightening and other finishing are carried out. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing a microstructure, wherein the grain sizes are fine and uniform and are all 20-40 mu m.
Example 6: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) The cast hastelloy C-276 with the blank size of 150 multiplied by 260mm and the components (wt): 5.98% of Fe, 16.03% of Cr, 16.77% of Mo, 4.28% of W, 0.30% of Mn, 0.005% of C, 0.07% of Si, 0.010% of P, 0.006% of S and the balance of Ni.
(2) Carrying out heat treatment on the material by using a heating furnace, setting a program at the original temperature of 48 ℃, raising the temperature to 1020 ℃ at the heating rate of 250 ℃/h, and keeping the temperature for 1.4 h; then heating to 1100 ℃ at the speed of 90 ℃/h, preserving the heat for 15.2h, discharging and air cooling. Before forging, the hastelloy C-276 is placed into a heating furnace before a forging press for heating, the temperature is increased to 990 ℃ at the temperature increase rate of 260 ℃/s, and the temperature is maintained for 1.1 h; then the temperature is raised to 1150 ℃ at the heating rate of 82 ℃/s, and the forging is started after the temperature is kept for 5.3 h.
(3) The blank after thorough heating enters a forging press for forging and pressing, a multi-fire forging mode is adopted, and the final forging temperature of each fire is controlled to be 1000 ℃ or above; namely, when the temperature of the forge piece is reduced to 1000-1015 ℃ during forging and pressing, taking out the forge piece, putting the forge piece into a heating furnace, and returning the forge piece to the heating furnace for temperature compensation; when the temperature is compensated, the blank is kept at 1145-1155 ℃ for 50 min. The billet is forged into a square billet with the size of 80X 80mm, and then straightening and other finishing are carried out. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing a microstructure, wherein the grain sizes are fine and uniform and are all 30-40 mu m.
Example 7: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) Hastelloy C-276 electroslag cast ingot with the size of phi 300 multiplied by 500mm and the components (wt): 4.53% of Fe, 15.11% of Cr, 17.0% of Mo, 3.35% of W, 0.70% of Mn, 0.009% of C, 0.05% of Si, 0.007% of P, 0.010% of S and the balance of Ni.
(2) Firstly, carrying out heat treatment on Hastelloy C-276, setting a program at an original temperature of a heating furnace of 75 ℃, heating to 995 ℃ at a heating rate of 270 ℃/h, and keeping the temperature for 1.0 h; then raising the temperature to 1090 ℃ at the speed of 90 ℃/h, preserving the temperature for 15.7h, discharging and air cooling. Before forging, placing the hastelloy C-276 into a heating furnace before a forging press for heating, raising the temperature to 1005 ℃ at the heating rate of 270 ℃/s, and preserving the heat for 1.2 h; then the temperature is raised to 1140 ℃ at the heating rate of 95 ℃/s, and the forging is started after the temperature is kept for 5.8 h.
(3) The blank after thorough heating enters a forging press for forging and pressing, a multi-fire forging mode is adopted, and the final forging temperature of each fire is controlled to be 1000 ℃ or above; namely, when the temperature of the forge piece is reduced to 1000-1015 ℃ during forging and pressing, taking out the forge piece, putting the forge piece into a heating furnace, and returning the forge piece to the heating furnace for temperature compensation; when the temperature is compensated, the blank is kept at 1145-1155 ℃ for 60 min. The billet is forged into a square billet having a size of 140X 140mm, and then finished by straightening and the like. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing a microstructure, wherein the grain sizes are fine and uniform and are all 30-50 mu m.
Example 8: the forging process of the Hastelloy C-276 is specifically described as follows.
(1) The cast hastelloy C-276 with the size of 150 multiplied by 300mm comprises the following components in percentage by weight: 4.97% of Fe, 16.55% of Cr, 15.96% of Mo, 3.51% of W, 0.62% of Mn, 0.010% of C, 0.02% of Si, 0.009% of P, 0.008% of S and the balance of Ni.
(2) Carrying out heat treatment on the material by using a heating furnace, setting a program at the original temperature of 58 ℃, raising the temperature to 1005 ℃ at the heating rate of 260 ℃/h, and keeping the temperature for 1.3 h; then the temperature is raised to 1120 ℃ at the speed of 85 ℃/h, the temperature is preserved for 15.8h, and the mixture is discharged from the furnace and cooled in air. Before forging, placing the hastelloy C-276 into a heating furnace before a forging press for heating, raising the temperature to 980 ℃ at the heating rate of 240 ℃/s, and preserving the heat for 1.3 h; then the temperature is raised to 1145 ℃ at the heating rate of 93 ℃/s, and the forging is started after the temperature is kept for 5.6 h.
(3) The blank after thorough heating enters a forging press for forging and pressing, a multi-fire forging mode is adopted, and the final forging temperature of each fire is controlled to be 1000 ℃ or above; namely, when the temperature of the forge piece is reduced to 1000-1015 ℃ during forging and pressing, taking out the forge piece, putting the forge piece into a heating furnace, and returning the forge piece to the heating furnace for temperature compensation; when the temperature is compensated, the blank is kept at 1150-1160 ℃ for 52 min. The billet is forged into a square billet with the size of 80X 80mm, and then straightening and other finishing are carried out. And air cooling after the forging is finished.
And observing that the surface of the blank is smooth and has no obvious cracks after cooling. Sampling and observing a microstructure, wherein the grain sizes are fine and uniform and are all 20-40 mu m.
Claims (3)
1. A forging process of hastelloy C-276 is characterized in that: it comprises the processes of heat treatment before forging, heating and forging; the pre-forging heat treatment process comprises the following steps: heating the alloy material to 980-1020 ℃, and preserving heat for 1-1.5 h; heating to 1080-1120 ℃ again, and preserving heat for 15-16 h; discharging and air cooling;
the heating process comprises the following steps: heating the alloy material to 980-1020 ℃, and preserving heat for 1-1.5 h; then heating to 1140-1160 ℃, and preserving heat for 5-6 h;
the forging process comprises the following steps: forging with multiple fire times, wherein a temperature compensation device of a forging press is adopted for heating during forging; controlling the final forging temperature of each fire to be 1000 ℃ or above by adopting a mode of returning to the furnace for supplementing the temperature in the heating furnace, and keeping the temperature of the blank at 1140-1160 ℃ for 50-60 min during temperature supplementing;
the hastelloy C-276 comprises the following components in percentage by weight: 4.0 to 7.0 percent of Fe, 14.5 to 16.5 percent of Cr, 15 to 17 percent of Mo, 3 to 4.5 percent of W, 0.3 to 0.7 percent of Mn, less than or equal to 0.01 percent of C, less than or equal to 0.08 percent of Si, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, and the balance of Ni.
2. The forging process of hastelloy C-276 as claimed in claim 1, wherein: in the pre-forging heat treatment process, the temperature of the alloy material is raised to 980-1020 ℃ at 200-300 ℃/h.
3. The forging process of hastelloy C-276 as claimed in claim 1 or 2, wherein: in the pre-forging heat treatment process, the temperature of the alloy material is raised to 1080-1120 ℃ at a speed of 80-100 ℃/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811580867.3A CN109590421B (en) | 2018-12-24 | 2018-12-24 | Forging process of Hastelloy C-276 |
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| CN112139415B (en) * | 2020-09-16 | 2022-04-19 | 江苏隆达超合金航材有限公司 | Method for producing difficult-to-deform nickel-based high-temperature alloy through compensation heating assisted free forging |
| CN114378234B (en) * | 2021-09-07 | 2023-11-03 | 江西宝顺昌特种合金制造有限公司 | NS3303 corrosion-resistant alloy and forging method thereof |
| CN115245996B (en) * | 2022-03-09 | 2023-09-19 | 江西宝顺昌特种合金制造有限公司 | UNS N06030 corrosion-resistant alloy forging and preparation method thereof |
| CN114700451B (en) * | 2022-03-28 | 2023-11-03 | 江西宝顺昌特种合金制造有限公司 | Forging production process of Waspaloy nickel-based alloy |
| CN114682718B (en) * | 2022-03-30 | 2023-10-20 | 江西宝顺昌特种合金制造有限公司 | HB-2 alloy forging and preparation method thereof |
| CN114833284B (en) * | 2022-03-30 | 2023-10-13 | 江西宝顺昌特种合金制造有限公司 | GH4145 alloy forging and preparation method thereof |
| CN114669701B (en) * | 2022-03-30 | 2023-10-03 | 江西宝顺昌特种合金制造有限公司 | GH4080A high-temperature alloy forging and preparation method thereof |
| CN116287802A (en) * | 2023-03-02 | 2023-06-23 | 江苏隆达超合金航材有限公司 | Manufacturing method of C276 alloy square flat material |
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