High-strength and high-toughness hastelloy C276 foil and preparation method thereof

Abstract

The invention belongs to the technical field of precise alloy foil preparation, and discloses a high-strength and high-toughness hastelloy C276 foil and a preparation method thereof. The alloy is ensured to have the characteristics of high purity, extremely low harmful precipitated phase and high alloy strengthening effect through optimal chemical component design; the purity and quality of the alloy are further improved through the combination form of first-time vacuum induction melting, second-time refining and third-time vacuum induction melting, and the requirement for long-term stability of the structure is met; the systematic forging, rolling and heat treatment technologies optimize the existing alloy foil preparation process flow, so that the finished hastelloy C276 foil has the characteristics of high strength, high toughness, high precision, high temperature resistance, corrosion resistance, oxidation resistance and excellent forming performance; and the use requirements in the fields of aerospace, electronics and electrician, new energy batteries and petrochemical industry can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of precision alloy foil preparation, and in particular to a high-strength and high-toughness Hastelloy C276 foil and a preparation method thereof. Background Art

[0002] Hastelloy C276 is a nickel-based alloy with excellent corrosion resistance, high temperature resistance and oxidation resistance. Its main components are nickel, chromium, iron, tungsten and molybdenum. Its products are widely used in aerospace, petrochemical, new energy batteries and other fields. In recent years, there has been a great demand for micron-level high-performance precision alloy foil in China, but due to the limitations of material properties, preparation technology and production equipment, various industries are still dependent on imported high-precision foil. Therefore, the study of Hastelloy C276 foil and systematic preparation technology is of great significance to breaking the foreign monopoly and realizing the localization of foil.

[0003] There are currently many technical difficulties in the preparation of Hastelloy C276 foil. First, the alloy is severely work-hardened and prone to cracking and breaking. The large amount of strengthening elements in Hastelloy C276 will significantly increase the strength of the material, but it loses some of its plastic deformation ability. As the amount of rolling deformation increases, the alloy undergoes significant work hardening and has great internal stress, which hinders its further thinning, and cracking and breaking will occur, resulting in an extremely low yield rate.

[0004] Secondly, the alloy has a small hot working window and no systematic preparation process. The heat treatment temperature and time of Hastelloy C276 need to be precisely controlled. Due to the small hot working window, abnormal grain growth is very likely to occur, and some hard and brittle precipitation phases are produced, resulting in excessive internal stress in the alloy and brittle hazards. A systematic melting, forging, solution treatment, rolling and annealing system can improve the alloy microstructure to the greatest extent, thereby improving the alloy performance.

[0005] Finally, the finished foil has low precision and poor mechanical properties. With the development of the manufacturing industry, various fields have put forward higher requirements for the dimensional accuracy and mechanical properties of alloy foils. At present, there is still a large gap between the domestic Hastelloy C276 foil and the international advanced level, and it cannot meet the use requirements. The present invention proposes a full-process preparation process with simple operation and low cost to produce high-strength, high-toughness and high-precision alloy foil to solve the existing technical problems. Summary of the invention

[0006] The present invention aims at the problems existing in the preparation process of Hastelloy C276 foil, such as severe work hardening, low dimensional accuracy, poor mechanical properties, complex process and high cost, and proposes a high-strength and high-toughness Hastelloy C276 foil and its preparation method. The produced high-strength and high-toughness Hastelloy C276 foil has the advantages of high temperature resistance, corrosion resistance, high strength, high toughness and oxidation resistance, and can be widely used in aerospace, petrochemical, electronic and electrical fields, and provides a full-process preparation method for the localization of Hastelloy C276 foil.

[0007] The technical solution of the present invention is as follows: a high-strength and high-toughness Hastelloy C276 foil, wherein the mass fractions of the elements are as follows: the mass fraction of the Mo element: 15.4%-16.6%, the mass fraction of the Fe element: 5.4%-6.1%, the mass fraction of the W element: 3.9%-4.6%, the mass fraction of the Cr element: 15.2%-16.1%, the mass fraction of the Co element: 2.0%-2.6%, the mass fraction of the Mn element: 0.5%-1.0%, the mass fraction of the Si element: 0.03%-0.07%, the mass fraction of the V element: 0.20%-0.28%, the mass fraction of the P element: 0.003%-0.006%, the mass fraction of the S element: 0.004%-0.006%, the mass fraction of the C element: 0.006%-0.009%, and the Ni element: the remainder.

[0008] Furthermore, the mass fraction of the Mo element and the mass fraction of the Fe element satisfy the following relationship:

[0009] 2.6%≤[Mo] / [Fe]≤3.0%;

[0010] Here, [Mo] represents the mass fraction of Mo, and [Fe] represents the mass fraction of Fe.

[0011] Furthermore, the mass fraction of the Cr element and the mass fraction of the W element satisfy the following relationship:

[0012] 3.4%≤[Cr] / [W]≤4.0%;

[0013] Here, [Cr] represents the mass fraction of Cr, and [W] represents the mass fraction of W.

[0014] Furthermore, the mass fraction of the Co element and the mass fraction of the Mn element satisfy the following relationship:

[0015] 2.6%≤[Co]+[Mn]≤3.5%;

[0016] Here, [Co] represents the mass fraction of Co, and [Mn] represents the mass fraction of Mn.

[0017] Furthermore, the mass fraction of the Si element and the mass fraction of the V element satisfy the following relationship:

[0018] 0.24%≤[Si]+[V]≤0.34%;

[0019] Here, [Si] represents the mass fraction of Si, and [V] represents the mass fraction of V.

[0020] A method for preparing a high-strength and high-toughness Hastelloy C276 foil comprises the following steps:

[0021] Step (1), weigh the raw materials of the high-strength and high-toughness Hastelloy C276 foil according to the mass fraction of each element and mix them evenly;

[0022] Step (2), first vacuum induction melting: subjecting the mixed raw materials to vacuum induction melting at a temperature of 1600° C. to 1630° C. under vacuum conditions, a heating rate of 8° C. / min to 10° C. / min, a vacuum degree of 1.0 Pa to 1.2 Pa, and a time of 4 h to 5 h;

[0023] Step (3), second refining: the alloy ingot obtained by the first vacuum induction melting is refined at a temperature of 1550°C-1580°C, a heating rate of 8°C / min-10°C / min, a vacuum degree of 1.0Pa-1.2Pa, and a time of 1h-2h to remove harmful elements and impurities;

[0024] Step (4), third vacuum induction melting: the alloy ingot obtained by the second refining is subjected to a third vacuum induction melting, with a heating rate of 8°C / min-10°C / min, a vacuum degree of 1.0Pa-1.2Pa, and a time of 2h-3h, and cast to form an alloy ingot; after the third vacuum induction melting, the impurity content in the alloy ingot is extremely low, the purity is high, no harmful precipitate phase is generated, and the mechanical properties of the alloy are improved.

[0025] Step (5), forging: forging the alloy ingot obtained in step (4) into a slab with a thickness of 40 mm to 45 mm at a temperature of 1150° C. to 1170° C., with the total deformation amount controlled at 60% to 70%;

[0026] Step (6), hot rolling: keeping the slab at 1120°C-1150°C for 45 minutes-60 minutes, hot rolling it into a 3mm-4mm thick plate, controlling the total deformation to 55%-65%, and water cooling;

[0027] Step (7), surface treatment and flaw detection of the plate, after confirming that its quality is qualified, solution treatment: 3mm-4mm thick plate is solution treated at 1120℃ for 60min-90min, and water cooled;

[0028] Step (8), the plate after solutionizing is subjected to multiple cold rolling and intermediate annealing: the deformation of each cold rolling is controlled to be less than 40%, the total deformation is 93%-96%, the cold rolling speed is 3 m / min-5 m / min, and finally a thin strip with a thickness of 0.15 mm-0.20 mm is obtained; the intermediate annealing temperature is 1090° C.-1110° C., the temperature is kept for 15 minutes-25 minutes, and water-cooled; during the intermediate annealing process, argon gas with a purity of 99.99% is introduced for oxidation prevention;

[0029] After step (9), pickling and trimming, multiple cold rolling and intermediate annealing are performed at the foil stage: the deformation of each cold rolling is controlled to be less than 30%, the total deformation is 46%-80%, the cold rolling speed is 1 m / min-3 m / min, and finally a foil with a thickness of 0.05 mm-0.08 mm is obtained; the intermediate annealing temperature is 1040° C.-1060° C., the temperature is kept for 25-35 minutes, and water-cooled; during the intermediate annealing process, argon gas with a purity of 99.99% is introduced to prevent oxidation;

[0030] Step (10), annealing of finished product: keeping the temperature at 1050° C. for 30 minutes, and water cooling.

[0031] Furthermore, the third vacuum induction melting temperature is 1570°C-1600°C.

[0032] Furthermore, the high-strength and high-toughness Hastelloy C276 foil obtained after annealing the finished product in step (10) has a tensile strength of ≥1100 MPa, a yield strength of ≥900 MPa, an elongation of ≥20%, and an absolute value of dimensional accuracy within 0.003 mm.

[0033] The beneficial effects of the present invention are as follows: the alloy is ensured to have the characteristics of high purity, extremely low harmful precipitation phase and high alloy strengthening effect through the optimal chemical composition design; the combination of the first vacuum induction melting, the second refining and the third vacuum induction melting further improves the purity and quality of the alloy, and meets the requirement of long-term organizational stability; the systematic forging, rolling and heat treatment technologies optimize the existing alloy foil preparation process, so that the finished Hastelloy C276 foil has the characteristics of high strength, high toughness, high precision, high temperature resistance, corrosion resistance, oxidation resistance and excellent forming performance, which can meet the use requirements in the fields of aerospace, electronics and electrical engineering, new energy batteries and petrochemical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The microstructure diagram of the high-strength and high-toughness Hastelloy C276 alloy after forging provided in Example 1 of the present invention;

[0035] Figure 2 A microstructure diagram of the high-strength and high-toughness Hastelloy C276 alloy after solution treatment provided in Example 2 of the present invention;

[0036] Figure 3 This is the microstructure diagram of the high-strength and high-toughness Hastelloy C276 after forging provided in Comparative Example 9 of the present invention. DETAILED DESCRIPTION

[0037] In order to make the technical solutions and advantages of the present invention more clearly understood, a detailed description will be given below in conjunction with some specific embodiments and comparative examples.

[0038] The Hastelloy C276 foil prepared by the present invention has the characteristics of high strength and high toughness through reasonable design of chemical composition, high purity, few inclusions, small carbide size, no harmful phase precipitation, good organizational stability, corrosion resistance, oxidation resistance, long service life, and no forging, hot rolling and cold rolling crack formation.

[0039] In the embodiments of the present invention, the value of [Mo] / [Fe] is further controlled to ensure the solid solution strengthening effect of the alloy, improve the high temperature strength and creep resistance of the alloy, reduce the precipitation of brittle phases, and reduce costs.

[0040] In the embodiments of the present invention, the value of [Cr] / [W] is further controlled to improve the oxidation resistance and thermal corrosion resistance of the alloy, so that the alloy has good high-temperature structural stability, and in addition, prevent the alloy from having excessive microscopic defects.

[0041] In the embodiments of the present invention, the value of [Co]+[Mn] is further controlled to effectively remove oxygen from the alloy and inhibit sulfides, thereby reducing oxide and sulfide inclusions, improving the purity of the alloy, and reducing the alloy density and cost.

[0042] In the embodiments of the present invention, the value of [Si]+[V] is further controlled to reduce the thermal expansion coefficient of the alloy, so that the alloy has good structural stability and thermal stability, and the strength and service performance of the alloy at high temperatures are improved.

[0043] Example 1

[0044] The mass fractions of the elements in the preparation method of high-strength and high-toughness Hastelloy C276 foil are as follows: Mo: 15.7%, Fe: 5.9%, W: 4.1%, Cr: 15.4%, Co: 2.1%, Mn: 0.6%, Si: 0.06%, V: 0.24%, P: 0.003%, S: 0.004%, C: 0.006%, Ni: balance; the raw materials are weighed and mixed to meet the above mass fraction ratio; the first vacuum induction melting temperature The temperature of the second refining was 1580℃, the heating rate was 8℃ / min, the vacuum was 1.0Pa, and the time was 2h; the temperature of the third vacuum induction melting was 1600℃, the heating rate was 10℃ / min, the vacuum was 1.0Pa, and the time was 3h; the alloy ingot was forged into a 45mm thick slab at a temperature of 1170℃, and the total deformation was controlled to be 60%.

[0045] Figure 1 The microstructure diagram after forging shows that the alloy has uniform structure after forging and no harmful precipitation phase is produced. The forged slab is kept at 1150℃ for 60 minutes and then hot rolled into a 3mm thick plate. The total deformation is controlled to be 65% and water-cooled. The hot-rolled plate is polished, cleaned and blown dry, and then the surface defects of the material are detected to confirm that its quality is qualified. The 3mm thick plate is solution-treated at 1120℃ for 90 minutes and water-cooled. It is then cold-rolled to a 0.15mm thick thin strip in multiple passes at a cold rolling speed of 4 meters per minute. The deformation of each cold rolling pass is 0.15mm. The deformation is controlled below 40%, and the total deformation is 95%; the intermediate annealing temperature is 1090℃, kept warm for 20 minutes, and water-cooled; pickling is used to remove the oxide layer and impurities, and trimming is used to remove the edge cracks of the material to ensure dimensional accuracy; the foil is cold rolled to 0.062mm thick in multiple passes, the cold rolling speed is 2 meters / minute, the deformation of each cold rolling pass is controlled below 30%, and the total deformation is 59%, the intermediate vacuum annealing temperature is 1060℃, kept warm for 25 minutes, and water-cooled; the finished product annealing is kept warm at 1050℃ for 30 minutes and water-cooled.

[0046] Example 2

[0047] The mass fractions of the elements in the preparation method of high-strength and high-toughness Hastelloy C276 foil are as follows: Mo: 16.2%, Fe: 5.6%, W: 4.3%, Cr: 15.8%, Co: 2.5%, Mn: 0.8%, Si: 0.05%, V: 0.27%, P: 0.005%, S: 0.005%, C: 0.007%, Ni: balance; the raw materials are weighed and mixed to meet the above mass fraction ratios, and the first vacuum induction melting temperature is The temperature of the second refining process is 1620℃, the heating rate is 8℃ / min, the vacuum is 1.2Pa, and the time is 4h; the second refining temperature is 1560℃, the heating rate is 10℃ / min, the vacuum is 1.2Pa, and the time is 1h; the third vacuum induction melting temperature is 1580℃, the heating rate is 9℃ / min, the vacuum is 1.2Pa, and the time is 2h; the alloy ingot is forged into a 42mm thick slab at a temperature of 1150℃; the total deformation is controlled to be 66%. The forged slab is kept at 1140℃ for 45 minutes, and then hot rolled into a 4mm thick plate, the total deformation is controlled to be 55%, and water cooled; the hot rolled plate is polished, cleaned and blown dry, and then the surface defects of the material are detected to confirm that its quality is qualified; the 4mm thick plate is solid solution at 1120℃ for 60 minutes and water cooled.

[0048] Figure 2 This is the microstructure diagram after solid solution. After solid solution, the alloy grain size is uniform, a large number of annealing twins are produced, the plastic toughness is good, and no obvious harmful phase is produced; then it is cold-rolled to a thin strip of 0.20mm thickness in multiple passes, the cold rolling speed is 5 meters / minute, the cold rolling deformation of each pass is controlled below 40%, the total deformation is 95%, the intermediate annealing temperature is 1000℃, the temperature is kept for 20 minutes, and water is cooled; pickling is used to remove the oxide layer and impurities, and the edge cracks of the material are removed by trimming to ensure dimensional accuracy; multiple passes of cold rolling are used to make the foil 0.073mm thick, the cold rolling speed is 3 meters / minute, the cold rolling deformation of each pass is controlled below 30%, the total deformation is 64%, the intermediate annealing temperature is 1050℃, the temperature is kept for 30 minutes, and water is cooled; the finished product annealing is carried out at a temperature of 1050℃ for 30 minutes and water is cooled.

[0049] Example 3

[0050] The mass fractions of the elements in the preparation method of high-strength and high-toughness Hastelloy C276 foil are as follows: Mo: 15.4%, Fe: 5.4%, W: 3.9%, Cr: 15.2%, Co: 2.0%, Mn: 0.5%, Si: 0.03%, V: 0.20%, P: 0.004%, S: 0.004%, C: 0.007%, Ni: balance; the raw materials are weighed and mixed to meet the above mass fraction ratio, and the first vacuum induction melting temperature is The temperature of the second refining process was 1550℃, the heating rate was 9℃ / min, the vacuum degree was 1.0Pa, and the time was 1.5h; the temperature of the third vacuum induction melting process was 1570℃, the heating rate was 8℃ / min, the vacuum degree was 1.0Pa, and the time was 2.5h; the alloy ingot was forged into a 40mm thick slab at a temperature of 1150℃; the total deformation was controlled to be 70%. The forged slab was kept at 1120℃ for 60 minutes, then hot rolled into a 3mm thick plate, with the total deformation controlled at 65%, and water cooled; the hot rolled plate was polished, cleaned and blown dry, and then the surface defects of the material were detected to confirm its quality; the 3mm thick plate was solution treated at 1120℃ for 90 minutes and water cooled; then cold rolled to a 0.18mm thick thin strip in multiple passes, with a cold rolling speed of 3 meters / minute, and the deformation of each cold rolling pass was controlled below 40%, with a total deformation of The annealing temperature is 1090℃, kept warm for 25 minutes and water-cooled. The oxide layer and impurities are removed by pickling, and the edge cracks are removed by trimming to ensure the dimensional accuracy. The foil is cold-rolled to 0.068mm thick in multiple passes, and the cold rolling speed is 1m / min. The deformation of each cold rolling pass is controlled below 30%, and the total deformation is 62%. The annealing temperature is 1040℃, kept warm for 35 minutes and water-cooled. The finished product is annealed at 1050℃ for 30 minutes and water-cooled.

[0051] Example 4

[0052] The mass fractions of the elements in the preparation method of high-strength and high-toughness Hastelloy C276 foil are as follows: Mo: 16.6%, Fe: 6.1%, W: 4.6%, Cr: 16.1%, Co: 2.6%, Mn: 1.0%, Si: 0.07%, V: 0.28%, P: 0.005%, S: 0.006%, C: 0.008%, Ni: balance; the raw materials are weighed and mixed to meet the above mass fraction ratio, and the first vacuum induction melting temperature is The temperature of the second refining process was 1550℃, the heating rate was 8℃ / min, the vacuum was 1.0Pa, and the time was 1h; the temperature of the third vacuum induction melting process was 1580℃, the heating rate was 9℃ / min, the vacuum was 1.2Pa, and the time was 2h; the alloy ingot was forged into a 40mm thick slab at a temperature of 1170℃; the total deformation was controlled to be 70%. The forged slab was kept at 1120℃ for 45 minutes, then hot rolled into a 3.5mm thick plate, with a total deformation of 60% and water-cooled; the hot-rolled plate was polished, cleaned and blown dry, and then the surface defects of the material were detected to confirm its quality; the 3.5mm thick plate was solution-treated at 1120℃ for 60 minutes and water-cooled; then cold rolled to a 0.19mm thick thin strip in multiple passes at a cold rolling speed of 3 meters / minute, with the deformation of each cold rolling pass controlled below 40% and a total deformation of 1.5%. The deformation amount is 95%, the intermediate annealing temperature is 1110℃, kept warm for 15 minutes, and water-cooled; pickling is used to remove the oxide layer and impurities, and the edge cutting is used to remove the edge cracks of the material to ensure the dimensional accuracy; the foil is cold rolled to 0.050mm thick in multiple passes, the cold rolling speed is 1m / min, the total deformation amount is 74%, and the deformation amount of each cold rolling pass is controlled below 30%, the intermediate annealing temperature is 1060℃, kept warm for 25 minutes, and water-cooled; the finished product annealing is kept warm at 1050℃ for 30 minutes and water-cooled.

[0053] Example 5

[0054] The mass fractions of the elements in the preparation method of high-strength and high-toughness Hastelloy C276 foil are as follows: Mo: 15.9%, Fe: 5.7%, W: 4.5%, Cr: 15.6%, Co: 2.2%, Mn: 0.9%, Si: 0.05%, V: 0.25%, P: 0.006%, S: 0.006%, C: 0.009%, Ni: balance; the raw materials are weighed and mixed to meet the above mass fraction ratio, and the first vacuum induction melting temperature is The temperature of the second refining process was 1550℃, the heating rate was 8℃ / min, the vacuum degree was 1.2Pa, and the time was 1.5h; the temperature of the third vacuum induction melting process was 1570℃, the heating rate was 8℃ / min, the vacuum degree was 1.2Pa, and the time was 3h; the alloy ingot was forged into a 43mm thick slab at a temperature of 1160℃; the total deformation was controlled to be 64%. The forged slab was kept at 1130℃ for 60 minutes, then hot rolled into a 4mm thick plate, with the total deformation controlled at 55%, and water cooled; the hot rolled plate was polished, cleaned and blown dry, and then the surface defects of the material were detected to confirm its quality; the 4mm thick plate was solution treated at 1120℃ for 90 minutes and water cooled; then cold rolled to a 0.20mm thick thin strip in multiple passes, with a cold rolling speed of 5 meters / minute, and the deformation of each cold rolling pass was controlled below 40%, with a total deformation of The intermediate annealing temperature is 1090℃, kept warm for 20 minutes, and water-cooled; pickling is used to remove the oxide layer and impurities, and the edge cutting is used to remove the edge cracks of the material to ensure the dimensional accuracy; the foil is cold rolled to 0.080mm thick in multiple passes, the cold rolling speed is 1m / min, the deformation of each cold rolling pass is controlled below 30%, the total deformation is 60%, the intermediate annealing temperature is 1040℃, kept warm for 25 minutes, and water-cooled; the finished product annealing is kept warm at 1050℃ for 30 minutes and water-cooled.

[0055] Comparative Example 1

[0056] It is basically the same as Example 1, except that the mass fraction of Mo is 14.5%, the mass fraction of Fe is 7%, and the following relationship is not satisfied:

[0057] 2.5≤[Mo] / [Fe]≤3.1.

[0058] Here, [Mo] represents the mass fraction of Mo, and [Fe] represents the mass fraction of Fe.

[0059] Comparative Example 2

[0060] It is basically the same as Example 1, except that the mass fraction of Mo is 17.2%, the mass fraction of Fe is 5.0%, and the following relationship is not satisfied:

[0061] 2.5≤[Mo] / [Fe]≤3.1.

[0062] Here, [Mo] represents the mass fraction of Mo, and [Fe] represents the mass fraction of Fe.

[0063] Comparative Example 3

[0064] It is basically the same as Example 1, except that the mass fraction of Cr is 14.6%, the mass fraction of W is 5.2%, and the following relationship is not satisfied:

[0065] 3.3≤[Cr] / [W]≤4.2.

[0066] Here, [Cr] represents the mass fraction of Cr, and [W] represents the mass fraction of W.

[0067] Comparative Example 4

[0068] It is basically the same as Example 1, except that the mass fraction of Cr is 16.5%, the mass fraction of W is 3.5%, and the following relationship is not satisfied:

[0069] 3.3≤[Cr] / [W]≤4.2.

[0070] Here, [Cr] represents the mass fraction of Cr, and [W] represents the mass fraction of W.

[0071] Comparative Example 5

[0072] It is basically the same as Example 1, except that the mass fraction of Co is 1.6%, the mass fraction of Mn is 0.4%, and the following relationship is not satisfied:

[0073] 2.4≤[Co]+[Mn]≤3.7.

[0074] Here, [Co] represents the mass fraction of Co, and [Mn] represents the mass fraction of Mn.

[0075] Comparative Example 6

[0076] It is basically the same as Example 1, except that the mass fraction of Co is 2.8%, the mass fraction of Mn is 1.2%, and the following relationship is not satisfied:

[0077] 2.4≤[Co]+[Mn]≤3.7.

[0078] Here, [Co] represents the mass fraction of Co, and [Mn] represents the mass fraction of Mn.

[0079] Comparative Example 7

[0080] It is basically the same as Example 1, except that the mass fraction of Si is 0.09%, the mass fraction of V is 0.33%, and the following relationship is not satisfied:

[0081] 0.22≤[Si]+[V]≤0.36.

[0082] Here, [Si] represents the mass fraction of Si, and [V] represents the mass fraction of V.

[0083] Comparative Example 8

[0084] It is basically the same as Example 1, except that the mass fraction of Si is 0.02%, the mass fraction of V is 0.17%, and the following relationship is not satisfied:

[0085] 0.22≤[Si]+[V]≤0.36.

[0086] Here, [Si] represents the mass fraction of Si, and [V] represents the mass fraction of V.

[0087] Comparative Example 9

[0088] The same as Example 1, except that the third vacuum induction melting step is not performed. Figure 3 This is the microstructure diagram after forging. It can be clearly seen that the alloy structure is uneven and a large amount of carbide impurities are precipitated, which seriously affects the mechanical properties of the alloy.

[0089] Comparative Example 10

[0090] It is basically the same as Example 1, except that the solution temperature is 1200°C. Too high a temperature causes coarse alloy grains, reduces its mechanical properties, and causes severe surface oxidation.

[0091] The mechanical properties of the Hastelloy C276 finished foil obtained according to the above-mentioned process of the embodiment and the comparative example are shown in Table 1.

[0092] Table 1 Mechanical properties of Hastelloy C276 finished foil

[0093]

[0094] The parts not described in detail in the present invention are known technologies. The above specific implementation methods are only used to illustrate the technical solutions and features of the present invention, mainly to allow people familiar with this technology to quickly understand the content of the present invention and implement it accordingly, but they cannot be used to limit the protection scope of the present invention. All equivalent modifications or replacements made according to the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength and high-toughness Hastelloy C276 foil, characterized in that: The mass fractions of each element in the high-strength and high-toughness Hastelloy C276 foil are as follows: mass fraction of Mo element: 15.4%-16.6%, mass fraction of Fe element: 5.4%-6.1%, mass fraction of W element: 3.9%-4.6%, mass fraction of Cr element: 15.2%-16.1%, mass fraction of Co element: 2.0%-2.6%, mass fraction of Mn element: 0.5%-1.0%, mass fraction of Si element: 0.03%-0.07%, mass fraction of V element: 0.20%-0.28%, mass fraction of P element: 0.003%-0.006%, mass fraction of S element: 0.004%-0.006%, mass fraction of C element: 0.006%-0.009%, Ni element: balance.

2. The high-strength and high-toughness Hastelloy C276 foil according to claim 1 is characterized in that: The mass fraction of the Mo element and the mass fraction of the Fe element satisfy the following relationship: 2.6%≤[Mo] / [Fe]≤3.0%; Here, [Mo] represents the mass fraction of Mo, and [Fe] represents the mass fraction of Fe.

3. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, characterized in that: The mass fraction of the Cr element and the mass fraction of the W element satisfy the following relationship: 3.4%≤[Cr] / [W]≤4.0%; Here, [Cr] represents the mass fraction of Cr, and [W] represents the mass fraction of W.

4. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, characterized in that: The mass fraction of the Co element and the mass fraction of the Mn element satisfy the following relationship: 2.6%≤[Co]+[Mn]≤3.5%; Here, [Co] represents the mass fraction of Co, and [Mn] represents the mass fraction of Mn.

5. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, characterized in that: The mass fraction of the Si element and the mass fraction of the V element satisfy the following relationship: 0.24%≤[Si]+[V]≤0.34%; Here, [Si] represents the mass fraction of Si, and [V] represents the mass fraction of V.

6. A method for preparing the high-strength and high-toughness Hastelloy C276 foil according to any one of claims 1 to 5, characterized in that: The steps include: Step (1), weigh the raw materials of the high-strength and high-toughness Hastelloy C276 foil according to the mass fraction of each element and mix them evenly; Step (2), first vacuum induction melting: subjecting the mixed raw materials to vacuum induction melting at a temperature of 1600° C. to 1630° C. under vacuum conditions, a heating rate of 8° C. / min to 10° C. / min, a vacuum degree of 1.0 Pa to 1.2 Pa, and a time of 4 h to 5 h; Step (3), second refining: the alloy ingot obtained by the first vacuum induction melting is refined at a temperature of 1550°C-1580°C, a heating rate of 8°C / min-10°C / min, a vacuum degree of 1.0Pa-1.2Pa, and a time of 1h-2h; Step (4), third vacuum induction melting: the alloy ingot obtained by the second refining is subjected to a third vacuum induction melting at a heating rate of 8°C / min-10°C / min, a vacuum degree of 1.0Pa-1.2Pa, and a time of 2h-3h, and cast to form an alloy ingot; Step (5), forging: forging the alloy ingot obtained in step (4) into a slab with a thickness of 40 mm to 45 mm at a temperature of 1150° C. to 1170° C., with the total deformation amount controlled at 60% to 70%; Step (6), hot rolling: keeping the slab at 1120°C-1150°C for 45 minutes-60 minutes, hot rolling it into a 3mm-4mm thick plate, controlling the total deformation to 55%-65%, and water cooling; Step (7), surface treatment and flaw detection of the plate, after confirming that its quality is qualified, solution treatment: 3mm-4mm thick plate is solution treated at 1120℃ for 60min-90min, and water cooled; Step (8), the plate after solutionizing is subjected to multiple cold rolling and intermediate annealing: the deformation of each cold rolling is controlled to be less than 40%, the total deformation is 93%-96%, the cold rolling speed is 3 m / min-5 m / min, and finally a thin strip with a thickness of 0.15 mm-0.20 mm is obtained; the intermediate annealing temperature is 1090° C.-1110° C., the temperature is kept for 15 minutes-25 minutes, and water-cooled; argon gas with a purity of 99.99% is introduced during the intermediate annealing process; After step (9), pickling and trimming, multiple cold rolling and intermediate annealing are performed at the foil stage: the deformation of each cold rolling is controlled to be less than 30%, the total deformation is 46%-80%, the cold rolling speed is 1 m / min-3 m / min, and finally a foil with a thickness of 0.05 mm-0.08 mm is obtained; the intermediate annealing temperature is 1040° C.-1060° C., the temperature is kept for 25-35 minutes, and water-cooled; argon gas with a purity of 99.99% is introduced during the intermediate annealing process; Step (10), annealing of finished product: keeping the temperature at 1050° C. for 30 minutes, and water cooling.

7. The preparation method according to claim 6, characterized in that: The third vacuum induction melting temperature is 1570°C-1600°C.

8. The preparation method according to claim 6, characterized in that: The high-strength and high-toughness Hastelloy C276 foil obtained after the finished product annealing in the step (10) has a tensile strength of ≥1100 MPa, a yield strength of ≥900 MPa, an elongation of ≥20%, and an absolute value of dimensional accuracy within 0.003 mm.

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