A high-strength and high-toughness Hastelloy C276 foil and its preparation method

Abstract

The present invention belongs to the technical field of preparation of precision alloy foils, and discloses a high-strength and high-toughness Hastelloy C276 foil and a preparation method thereof. Through the designed preferred chemical composition, the alloy is ensured to have the characteristics of high purity, extremely low harmful precipitation phases and high alloy strengthening effect; the combination form 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 stable structure; the systematic forging, rolling and heat treatment technologies optimize the existing preparation process flow of alloy foils, 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 can meet the use requirements in the fields of aerospace, electronic and electrical engineering, new energy batteries and petrochemical industry.

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, high-temperature, 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 huge demand in China for micron-level high-performance precision alloy foil. However, due to limitations in material properties, preparation technology, and production equipment, various industries still rely on imported high-precision foil. Therefore, research on Hastelloy C276 foil and systematic preparation technology is of great significance to breaking the foreign monopoly and achieving domestic production of foil.

[0003] The production of Hastelloy C276 foil currently faces several technical challenges. First, the alloy suffers from severe work hardening, making it prone to cracking and breaking. The large amount of strengthening elements in Hastelloy C276 significantly increases the material's strength, but also partially reduces its plastic deformation capacity. As the amount of rolling deformation increases, the alloy undergoes significant work hardening, resulting in significant internal stresses that hinder further thinning and can lead to cracking and breaking, resulting in an extremely low yield rate.

[0004] Secondly, the alloy has a narrow hot working window and lacks a systematic preparation process. The heat treatment temperature and time of Hastelloy C276 require precise control. Due to the narrow hot working window, abnormal grain growth is very likely to occur, and some hard and brittle precipitation phases are produced. This leads to excessive internal stress in the alloy and creates brittleness hazards. A systematic melting, forging, solutionizing, rolling, and annealing process can maximize the improvement of the alloy's microstructure, thereby enhancing its properties.

[0005] Finally, the finished foil has low precision and poor mechanical properties. With the development of the manufacturing industry, various fields have placed higher demands on the dimensional accuracy and mechanical properties of alloy foil. Currently, domestic Hastelloy C276 foil still lags far behind internationally advanced levels and cannot meet application requirements. This invention proposes a simple, low-cost, full-process preparation process to produce high-strength, high-toughness, and high-precision alloy foil, resolving existing technical challenges. Summary of the Invention

[0006] In view of 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, the present invention 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 the fields of aerospace, petrochemical industry, electronic and electrical engineering, etc., providing 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, and the mass fractions of each element are as follows: the mass fraction of Mo element: 15.4% - 16.6%, the mass fraction of Fe element: 5.4% - 6.1%, the mass fraction of W element: 3.9% - 4.6%, the mass fraction of Cr element: 15.2% - 16.1%, the mass fraction of Co element: 2.0% - 2.6%, the mass fraction of Mn element: 0.5% - 1.0%, the mass fraction of Si element: 0.03% - 0.07%, the mass fraction of V element: 0.20% - 0.28%, the mass fraction of P element: 0.003% - 0.006%, the mass fraction of S element: 0.004% - 0.006%, the mass fraction of C element: 0.006% - 0.009%, and the balance is Ni element.

[0008] Further, 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] Wherein, [Mo] represents the mass fraction of Mo, and [Fe] represents the mass fraction of Fe.

[0011] Further, 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] Wherein, [Cr] represents the mass fraction of Cr, and [W] represents the mass fraction of W.

[0014] Further, 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] Wherein, [Co] represents the mass fraction of Co, and [Mn] represents the mass fraction of Mn.

[0017] Further, the mass fraction of the Si element and the mass fraction of the V element satisfy the following relational expression:

[0018] 0.24% ≤ [Si] + [V] ≤ 0.34%;

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

[0020] A preparation method of a high-strength and high-toughness Hastelloy C276 foil material comprises the following steps:

[0021] Step (1), weighing raw materials of each element of the high-strength and high-toughness Hastelloy C276 foil material and mixing them evenly;

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

[0023] Step (3), the second refining: carrying out refining on the alloy ingot obtained from the first vacuum induction melting at a temperature of 1550°C - 1580°C, with a heating rate of 8°C / minute - 10°C / minute, a vacuum degree of 1.0 Pa - 1.2 Pa, and a time of 1 h - 2 h, for removing harmful elements and impurities;

[0024] Step (4), the third vacuum induction melting: carrying out the third vacuum induction melting on the alloy ingot obtained from the second refining, with a heating rate of 8°C / minute - 10°C / minute, a vacuum degree of 1.0 Pa - 1.2 Pa, and a time of 2 h - 3 h, and pouring 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, and no harmful precipitation phase is generated, improving the mechanical properties of the alloy.

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

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

[0027] Step (7), surface treatment and flaw detection of the sheet, and after confirming that its quality is qualified, carrying out solution treatment: carrying out solution treatment on the 3 mm - 4 mm thick sheet at 1120°C for 60 minutes - 90 minutes, and water cooling;

[0028] Step (8), the solution-treated sheet is subjected to multi-pass cold rolling and intermediate annealing: the cold rolling deformation per pass is controlled below 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 holding time is 15 minutes - 25 minutes, and water cooling is carried out; during the intermediate annealing process, argon with a purity of 99.99% is introduced to prevent oxidation;

[0029] Step (9), after pickling and trimming, multi-pass cold rolling and intermediate annealing in the foil stage are carried out: the cold rolling deformation per pass is controlled below 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 holding time is 25 - 35 minutes, and water cooling is carried out; during the intermediate annealing process, argon with a purity of 99.99% is introduced to prevent oxidation;

[0030] Step (10), finish annealing: hold at a temperature of 1050°C for 30 minutes and then water cool.

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

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

[0033] The beneficial effects of the present invention: By the preferred chemical composition design, the alloy is ensured to have the characteristics of high purity, extremely low harmful precipitation phases, and high alloy strengthening effect; the combination form of the first vacuum induction melting, the second refining, and the third vacuum induction melting further improves the purity and quality of the alloy, meeting the requirements of long-term stable microstructure; the systematic forging, rolling, and heat treatment technologies optimize the existing preparation process of alloy foils, making the finished Hastelloy C276 foil have the characteristics of high strength, high toughness, high precision, high temperature resistance, corrosion resistance, oxidation resistance, and excellent formability, which can meet the usage requirements in the fields of aerospace, electronic and electrical engineering, new energy batteries, and petrochemical industry. Description of the Drawings

[0034] Figure 1 It is the microstructure diagram of the high-strength and high-toughness Hastelloy C276 after forging provided by Embodiment 1 of the present invention;

[0035] Figure 2 It is the microstructure diagram of the high-strength and high-toughness Hastelloy C276 after solution treatment provided by Embodiment 2 of the present invention;

[0036] Figure 3 This is the microstructural diagram of the forged Hastelloy C276 provided in Comparative Example 9 of the present invention. Detailed Embodiments

[0037] In order to make the technical solutions and advantages of the present invention clearer, the following will describe in detail with reference to some specific embodiments and comparative examples.

[0038] By reasonably designing the chemical composition, the Hastelloy C276 foil produced in the present invention has the characteristics of high strength and high toughness, and also has high purity, few inclusions, small carbide size, no precipitation of harmful phases, good tissue stability, corrosion resistance, oxidation resistance, long service life, and no formation of forging, hot rolling and cold rolling cracks.

[0039] In the embodiments of the present invention, further controlling the value of [Mo] / [Fe] ensures the solution strengthening effect of the alloy, improves the high-temperature strength and creep resistance of the alloy, reduces the precipitation of brittle phases, and reduces costs.

[0040] In the embodiments of the present invention, further controlling the value of [Cr] / [W] improves the oxidation resistance and hot corrosion resistance of the alloy, makes the alloy have good high-temperature tissue stability, and in addition, prevents the alloy from having too many microdefects.

[0041] In the embodiments of the present invention, further controlling the value of [Co]+[Mn] effectively removes oxygen in the alloy and inhibits sulfides, thereby reducing oxide and sulfide inclusions, improving the purity of the alloy, and can also reduce the alloy density and cost.

[0042] In the embodiments of the present invention, further controlling the value of [Si]+[V] can reduce the thermal expansion coefficient of the alloy, making the alloy have good tissue stability and thermal stability, and improving the strength and service performance of the alloy at high temperatures.

[0043] Embodiment 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: the balance; Weigh the raw materials according to the above mass fraction ratio and mix them; The temperature of the first vacuum induction melting is 1630 °C, the heating rate is 10 °C per minute, the vacuum degree is 1.0 Pa, and the time is 5 h; The temperature of the second refining is 1580 °C, the heating rate is 8 °C per minute, the vacuum degree is 1.0 Pa, and the time is 2 h; The temperature of the third vacuum induction melting is 1600 °C, the heating rate is 10 °C per minute, the vacuum degree is 1.0 Pa, and the time is 3 h; Forge the alloy ingot into a slab with a thickness of 45 mm at a temperature of 1170 °C, and control the total deformation amount to 60%.

[0045] Figure 1 Figure 4 is the microstructure diagram after forging. The structure of the alloy is uniform after forging, and no harmful precipitated phases are generated; Keep the forged slab at 1150 °C for 60 minutes, then hot-roll it into a sheet with a thickness of 3 mm, control the total deformation amount to 65%, and cool it with water; Grind, clean and dry the hot-rolled sheet, then conduct surface defect detection on the material to confirm that its quality is qualified; Solutionize the 3-mm-thick sheet at 1120 °C for 90 minutes and cool it with water; Subsequently, cold-roll it into a thin strip with a thickness of 0.15 mm in multiple passes. The cold-rolling speed is 4 meters per minute, and the cold-rolling deformation amount per pass is controlled below 40%. The total deformation amount is 95%; The intermediate annealing temperature is 1090 °C, keep it warm for 20 minutes, and cool it with water; Use pickling to remove the oxide layer and impurities, and cut the edges to remove the edge cracks of the material to ensure dimensional accuracy; Cold-roll it into a foil with a thickness of 0.062 mm in multiple passes. The cold-rolling speed is 2 meters per minute, and the cold-rolling deformation amount per pass is controlled below 30%. The total deformation amount is 59%. The intermediate vacuum annealing temperature is 1060 °C, keep it warm for 25 minutes, and cool it with water; The finished product annealing is carried out by keeping it warm at 1050 °C for 30 minutes and cooling it with water.

[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: the balance; Weigh the raw materials according to the above mass fraction ratio and mix them. The temperature of the first vacuum induction melting is 1620 °C, the heating rate is 8 °C per minute, the vacuum degree is 1.2 Pa, and the time is 4 h; The temperature of the second refining is 1560 °C, the heating rate is 10 °C per minute, the vacuum degree is 1.2 Pa, and the time is 1 h; The temperature of the third vacuum induction melting is 1580 °C, the heating rate is 9 °C per minute, the vacuum degree is 1.2 Pa, and the time is 2 h; Forge the alloy ingot into a slab with a thickness of 42 mm at a temperature of 1150 °C; Control the total deformation amount to 66%. Keep the forged slab at 1140 °C for 45 minutes, then hot-roll it into a sheet with a thickness of 4 mm, control the total deformation amount to 55%, and cool it with water; Grind, clean and dry the hot-rolled sheet, and then detect the surface defects of the material to confirm that its quality is qualified; Solution-treat the 4-mm-thick sheet at 1120 °C for 60 minutes and cool it with water.

[0048] Figure 2 It is the microstructural diagram after solution treatment. After solution treatment, the grain size of the alloy is uniform, a large number of annealing twins are generated, the plastic toughness is good, and no obvious harmful phases are produced; Subsequently, cold-roll it into a thin strip with a thickness of 0.20 mm in multiple passes. The cold-rolling speed is 5 m / min, the cold-rolling deformation amount per pass is controlled below 40%, the total deformation amount is 95%, the intermediate annealing temperature is 1000 °C, keep it warm for 20 minutes, and cool it with water; Remove the oxide layer and impurities by pickling, and cut the edges to remove the edge cracks of the material to ensure the dimensional accuracy; Cold-roll it into a foil with a thickness of 0.073 mm in multiple passes. The cold-rolling speed is 3 m / min, the cold-rolling deformation amount per pass is controlled below 30%, the total deformation amount is 64%, the intermediate annealing temperature is 1050 °C, keep it warm for 30 minutes, and cool it with water; The finished product annealing is carried out by keeping it warm at 1050 °C for 30 minutes and cooling it with water.

[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: the balance; Weigh the raw materials according to the above mass fraction ratio and mix them. The temperature of the first vacuum induction melting is 1600°C, the heating rate is 8°C / minute, the vacuum degree is 1.0 Pa, and the time is 5 h; The temperature of the second refining is 1550°C, the heating rate is 9°C / minute, the vacuum degree is 1.0 Pa, and the time is 1.5 h; The temperature of the third vacuum induction melting is 1570°C, the heating rate is 8°C / minute, the vacuum degree is 1.0 Pa, and the time is 2.5 h; Forge the alloy ingot into a slab with a thickness of 40 mm at a temperature of 1150°C; The total deformation is controlled to be 70%. Keep the forged slab at 1120°C for 60 minutes, then hot-roll it into a sheet with a thickness of 3 mm, and the total deformation is controlled to be 65%, and cool it with water; Grind, clean and dry the hot-rolled sheet, then conduct surface defect detection on the material to confirm that its quality is qualified; Keep the 3-mm-thick sheet at 1120°C for solution treatment for 90 minutes, and cool it with water; Subsequently, cold-roll it into a thin strip with a thickness of 0.18 mm in multiple passes. The cold-rolling speed is 3 m / minute. The cold-rolling deformation of each pass is controlled to be below 40%, and the total deformation is 94%. The intermediate annealing temperature is 1090°C, keep it warm for 25 minutes, and cool it with water; Remove the oxide layer and impurities by pickling, and cut the edges to remove the edge cracks of the material to ensure the dimensional accuracy; Cold-roll it into a foil with a thickness of 0.068 mm in multiple passes. The cold-rolling speed is 1 m / minute. The cold-rolling deformation of each pass is controlled to be below 30%, and the total deformation is 62%. The intermediate annealing temperature is 1040°C, keep it warm for 35 minutes, and cool it with water; The finished product annealing is carried out by keeping it at a temperature of 1050°C for 30 minutes, and cool it with water.

[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: the balance; Weigh the raw materials according to the above mass fraction ratio and mix them. The temperature of the first vacuum induction melting is 1620 °C, the heating rate is 9 °C / minute, the vacuum degree is 1.2 Pa, and the time is 4.5 h; The temperature of the second refining is 1550 °C, the heating rate is 8 °C / minute, the vacuum degree is 1.0 Pa, and the time is 1 h; The temperature of the third vacuum induction melting is 1580 °C, the heating rate is 9 °C / minute, the vacuum degree is 1.2 Pa, and the time is 2 h; Forge the alloy ingot into a slab with a thickness of 40 mm at a temperature of 1170 °C; Control the total deformation amount to 70%. Keep the forged slab at 1120 °C for 45 minutes, and then hot-roll it into a sheet with a thickness of 3.5 mm, control the total deformation amount to 60%, and cool it with water; Grind, clean and dry the hot-rolled sheet, and then detect the surface defects of the material to confirm that its quality is qualified; Solution-treat the 3.5-mm-thick sheet at 1120 °C for 60 minutes and cool it with water; Subsequently, cold-roll it in multiple passes to a thin strip with a thickness of 0.19 mm, the cold-rolling speed is 3 m / minute, the cold-rolling deformation amount per pass is controlled below 40%, the total deformation amount is 95%, the intermediate annealing temperature is 1110 °C, keep it warm for 15 minutes, and cool it with water; Remove the oxide layer and impurities by pickling, and trim the edges to remove the edge cracks of the material to ensure the dimensional accuracy; Cold-roll it in multiple passes to a foil with a thickness of 0.050 mm, the cold-rolling speed is 1 m / minute, the total deformation amount is 74%, the cold-rolling deformation amount per pass is controlled below 30%, the intermediate annealing temperature is 1060 °C, keep it warm for 25 minutes, and cool it with water; The finished product annealing is carried out by keeping it warm at 1050 °C for 30 minutes and cooling it with water.

[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: the balance; Weigh the raw materials according to the above mass fraction ratio and mix them. The temperature of the first vacuum induction melting is 1600 °C, the heating rate is 10 °C / minute, the vacuum degree is 1.2 Pa, and the time is 4 h; The temperature of the second refining is 1550 °C, the heating rate is 8 °C / minute, the vacuum degree is 1.2 Pa, and the time is 1.5 h; The temperature of the third vacuum induction melting is 1570 °C, the heating rate is 8 °C / minute, the vacuum degree is 1.2 Pa, and the time is 3 h; Forge the alloy ingot into a slab with a thickness of 43 mm at a temperature of 1160 °C; Control the total deformation amount to 64%. Keep the forged slab at 1130 °C for 60 minutes, then hot-roll it into a sheet with a thickness of 4 mm, control the total deformation amount to 55%, and cool it with water; Grind, clean and blow dry the hot-rolled sheet, then detect the surface defects of the material and confirm that its quality is qualified; Solution-treat the 4-mm-thick sheet at 1120 °C for 90 minutes and cool it with water; Subsequently, cold-roll it in multiple passes to a thin strip with a thickness of 0.20 mm, the cold-rolling speed is 5 m / minute, the cold-rolling deformation amount in each pass is controlled below 40%, the total deformation amount is 95%, the intermediate annealing temperature is 1090 °C, keep it warm for 20 minutes, and cool it with water; Remove the oxide layer and impurities by pickling, and trim the edges to remove the edge cracks of the material to ensure the dimensional accuracy; Cold-roll it in multiple passes to a foil with a thickness of 0.080 mm, the cold-rolling speed is 1 m / minute, the cold-rolling deformation amount in each pass is controlled below 30%, the total deformation amount is 60%, the intermediate annealing temperature is 1040 °C, keep it warm for 25 minutes, and cool it with water; The finished product annealing is carried out by keeping it warm at 1050 °C for 30 minutes and cooling it with water.

[0055] Comparative Example 1

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

[0057] 2.5 ≤ [Mo] / [Fe] ≤ 3.1.

[0058] Among them, [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% and the mass fraction of Fe is 5.0%, and it does not satisfy the following relationship:

[0061] 2.5 ≤ [Mo] / [Fe] ≤ 3.1.

[0062] Among them, [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% and the mass fraction of W is 5.2%, not satisfying the following relational expression:

[0065] 3.3 ≤ [Cr] / [W] ≤ 4.2.

[0066] Among them, [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% and the mass fraction of W is 3.5%, not satisfying the following relational expression:

[0069] 3.3 ≤ [Cr] / [W] ≤ 4.2.

[0070] Among them, [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% and the mass fraction of Mn is 0.4%, not satisfying the following relational expression:

[0073] 2.4 ≤ [Co] + [Mn] ≤ 3.7.

[0074] Among them, [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% and the mass fraction of Mn is 1.2%, not satisfying the following relational expression:

[0077] 2.4 ≤ [Co] + [Mn] ≤ 3.7.

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

[0079] Comparative Example 7

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

[0081] 0.22 ≤ [Si] + [V] ≤ 0.36.

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

[0083] Comparative Example 8

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

[0085] 0.22 ≤ [Si] + [V] ≤ 0.36.

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

[0087] Comparative Example 9

[0088] Basically the same as Example 1, except that the third vacuum induction melting step is not carried out, Figure 3 It is the microstructure diagram after forging. It can be clearly seen that the alloy structure is uneven, and a large amount of carbide impurities precipitate, seriously affecting the mechanical properties of the alloy.

[0089] Comparative Example 10

[0090] Basically the same as Example 1, except that the solution temperature is 1200 °C. The too high temperature causes the alloy grains to be coarse, reducing its mechanical properties and serious surface oxidation.

[0091] The mechanical properties of the Hastelloy C276 finished foil obtained by the above processes according to the examples and comparative examples are shown in Table 1.

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

[0093]

[0094] What is not elaborated in detail in the present invention is well-known technology. The above specific embodiments are only used to illustrate the technical solutions and features of the present invention, mainly to enable those familiar with this technology to quickly understand the content of the present invention and implement it accordingly, but cannot be used to limit the protection scope of the present invention. All equivalent modifications or substitutions made according to the technical solutions of the present invention should be included within 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 the elements in the high-strength and high-toughness Hastelloy C276 foil are as follows: the mass fraction of Mo element: 15.4% - 16.6%, the mass fraction of Fe element: 5.4% - 6.1%, the mass fraction of W element: 3.9% - 4.6%, the mass fraction of Cr element: 15.2% - 16.1%, the mass fraction of Co element: 2.0% - 2.6%, the mass fraction of Mn element: 0.5% - 1.0%, the mass fraction of Si element: 0.03% - 0.07%, the mass fraction of V element: 0.20% - 0.28%, the mass fraction of P element: 0.003% - 0.006%, the mass fraction of S element: 0.004% - 0.006%, the mass fraction of C element: 0.006% - 0.009%, and the balance is Ni element; 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; where, [Mo] represents the mass fraction of Mo, and [Fe] represents the mass fraction of Fe; 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; where, [Cr] represents the mass fraction of Cr, and [W] represents the mass fraction of W; The preparation method of the above high-strength and high-toughness Hastelloy C276 foil includes the following steps: Step (1), weigh the raw materials according to the mass fractions of the elements in the high-strength and high-toughness Hastelloy C276 foil and mix them evenly; Step (2), the first vacuum induction melting: carry out vacuum induction melting on the mixed raw materials at a temperature of 1600°C - 1630°C under vacuum conditions, with a heating rate of 8°C / min - 10°C / min, a vacuum degree of 1.0 Pa - 1.2 Pa, and a time of 4 h - 5 h; Step (3), the second refining: refine the alloy ingot obtained from the first vacuum induction melting at a temperature of 1550°C - 1580°C, with a heating rate of 8°C / min - 10°C / min, a vacuum degree of 1.0 Pa - 1.2 Pa, and a time of 1 h - 2 h; Step (4), the third vacuum induction melting: carry out the third vacuum induction melting on the alloy ingot obtained from the second refining, with a heating rate of 8°C / min - 10°C / min, a vacuum degree of 1.0 Pa - 1.2 Pa, and a time of 2 h - 3 h, and pour to form an alloy ingot; Step (5), forging: forge the alloy ingot obtained in step (4) into a slab with a thickness of 40 mm - 45 mm at a temperature of 1150°C - 1170°C, and control the total deformation amount within 60% - 70%; Step (6), hot rolling: keep the slab at 1120°C - 1150°C for 45 minutes - 60 minutes, hot roll it into a sheet with a thickness of 3 mm - 4 mm, control the total deformation amount within 55% - 65%, and cool it with water; Step (7), surface treatment and flaw detection of the sheet, and after confirming that its quality is qualified, carry out solution treatment: solution-treat the 3 mm - 4 mm thick sheet at 1120°C for 60 minutes - 90 minutes, and cool it with water; Step (8), the solution-treated sheet is subjected to multi-pass cold rolling and intermediate annealing: the cold rolling deformation per pass is controlled below 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, holding for 15 minutes - 25 minutes, and water cooling; argon with a purity of 99.99% is introduced during the intermediate annealing process; Step (9), after pickling and trimming, multi-pass cold rolling and intermediate annealing in the foil stage are carried out: the cold rolling deformation per pass is controlled below 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, holding for 25 - 35 minutes, and water cooling; argon with a purity of 99.99% is introduced during the intermediate annealing process; Step (10), finish annealing: holding at a temperature of 1050°C for 30 minutes, and water cooling.

2. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, wherein 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%; where, [Co] represents the mass fraction of Co, and [Mn] represents the mass fraction of Mn.

3. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, wherein 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%; where, [Si] represents the mass fraction of Si, and [V] represents the mass fraction of V.

4. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, characterized in that, The third vacuum induction melting temperature is 1570°C - 1600°C.

5. The high-strength and high-toughness Hastelloy C276 foil according to claim 1, wherein The high-strength and high-toughness Hastelloy C276 foil obtained after finish annealing in step (10) has a tensile strength ≥ 1100 MPa, a yield strength ≥ 900 MPa, an elongation ≥ 20%, and the absolute value of the dimensional accuracy is within 0.003 mm.

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