High Mo, Al and Ti type nickel-based high-temperature alloy and preparation method thereof

Abstract

The invention relates to the technical field of high-temperature alloy smelting, in particular to a high-Mo, Al and Ti type nickel-based high-temperature alloy and a preparation method thereof.The preparation method comprises the following steps that S1, a consumable electrode is annealed under the condition that the temperature ranges from 1130 DEG C to 1200 DEG C; and S2, the annealed consumable electrode is subjected to vacuum consumable remelting, and the high Mo, Al and Ti type nickel-based high-temperature alloy consumable steel ingot is obtained. According to the preparation method, by increasing the annealing temperature of the consumable electrode, the technical problem that the melting speed fluctuation is large in the vacuum consumable remelting smelting process of the high-Mo, Al and Ti type nickel-based superalloy is effectively solved, and the melting speed fluctuation of the consumable electrode is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature alloy smelting, and in particular to a high-Mo, Al, Ti type nickel-based high-temperature alloy and a preparation method thereof. Background Art

[0002] With the continuous development of aviation engines and heavy-duty gas engines, in order to meet the material selection needs of advanced engines that are resistant to higher temperatures, have higher high-temperature strength, and have higher heat-corrosion resistance, the development trend of high-temperature alloy materials is that the alloy content is getting higher and higher, especially the content of Mo, Al, and Ti elements that play a major strengthening role in high-temperature alloys is constantly increasing.

[0003] High-temperature alloys are basically produced by a dual process of vacuum induction smelting + vacuum consumable remelting or a triple process of vacuum induction smelting + electroslag remelting + vacuum consumable remelting. The traditional vacuum consumable electrode annealing process will cause large fluctuations in the melting rate of high Mo, Al, and Ti type nickel-based high-temperature alloys during the vacuum consumable remelting process, which will cause metallurgical defects such as black spots and white spots to easily appear on the rods, ultimately affecting product quality and service life. Therefore, how to reduce the fluctuation in the melting rate of the consumable electrode during the vacuum consumable remelting process of high Mo, Al, and Ti type nickel-based high-temperature alloys is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a high-Mo, Al, Ti type nickel-based high-temperature alloy and a preparation method thereof. The method effectively solves the technical problem of large melting rate fluctuations during vacuum consumable remelting of high-Mo, Al, Ti type nickel-based high-temperature alloys by increasing the annealing temperature of the consumable electrode, thereby reducing the melting rate fluctuations of the consumable electrode.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for preparing a high-Mo, Al, Ti type nickel-based high-temperature alloy, the preparation method comprising the following steps:

[0007] S1, annealing the consumable electrode at a temperature of 1130° C. to 1200° C.;

[0008] S2. The annealed consumable electrode is remelted in vacuum to obtain a consumable steel ingot of a nickel-based high-temperature alloy with high Mo, Al and Ti content.

[0009] The method effectively solves the technical problem of large melting rate fluctuation during vacuum consumable remelting of high-Mo, Al and Ti nickel-based high-temperature alloys by increasing the annealing temperature of the consumable electrode, thereby reducing the melting rate fluctuation of the consumable electrode.

[0010] Furthermore, the composition of the high Mo, Al, Ti type nickel-based high-temperature alloy is as follows by mass percentage: C≤0.12%, Cr 18.00%~20.00%, Co 10.00%~12.00%, Mo9.00%~10.50%, Al 1.40%~1.70%, Ti 3.00%~3.30%, B 0.003%~0.010%, Zr≤0.07%, Fe≤5.00%, Mn≤0.10%, Si≤0.50%, P≤0.015%, S≤0.015%, Cu≤0.50%, and the balance is Ni and unavoidable impurities.

[0011] Furthermore, the consumable electrode is obtained by smelting in a vacuum induction furnace and then casting.

[0012] Furthermore, in step S1, the cast consumable electrode is sent to an annealing furnace within 60 minutes after demoulding, and annealed at a temperature of 1130°C-1200°C for 10-20 hours, then cooled to no higher than 450°C in the furnace, and then taken out of the furnace and cooled in air.

[0013] Furthermore, after step S1 and before step S2, the preparation method further comprises: sawing, grinding wheel peeling and welding the annealed consumable electrode.

[0014] Furthermore, during the smelting process in the vacuum induction furnace, the refining vacuum degree is ≤2.7Pa, the air leakage rate is ≤7.5Pa / min, the refining time is >30min, the refining temperature is 1430-1500°C, the tapping temperature is 1440-1480°C, and the molten steel cast in the ingot mold is cooled in a vacuum environment for 40-60min before breaking through the air and demolding.

[0015] Furthermore, during the vacuum consumable remelting process, in the arc starting stage, the voltage is 21-25V, the current is 4-8KA, and the melting rate in the vacuum consumable remelting stable stage is 3-5kg / min.

[0016] Furthermore, during the vacuum consumable remelting process, after the ingot weight reaches 9-11% of the total weight of the consumable electrode, helium is introduced into the crystallizer through the equipment cooling gas pipeline, and the helium pressure is 300Pa-500Pa.

[0017] Furthermore, during the vacuum consumable remelting process, when the remaining consumable electrode weight reaches 5% to 9% of the initial consumable electrode total weight, the shrinkage begins, and when the remaining consumable electrode weight reaches 1% to 3% of the initial consumable electrode total weight, the shrinkage ends and the power is cut off.

[0018] In a second aspect, the present invention provides a high-Mo, Al, Ti type nickel-based high-temperature alloy, and the high-Mo, Al, Ti type nickel-based high-temperature alloy is prepared by the preparation method described in the first aspect.

[0019] Compared with the prior art, the beneficial effects of the present invention include at least:

[0020] The preparation method of high Mo, Al, Ti type nickel-based high-temperature alloy provided by the present invention effectively solves the technical problem of large melting rate fluctuation during vacuum consumable remelting smelting of high Mo, Al, Ti type nickel-based high-temperature alloy by increasing the annealing temperature of the consumable electrode, thereby reducing the melting rate fluctuation of the consumable electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a graph showing the change of melting rate over time during vacuum consumable remelting in Comparative Example 1 of the present invention;

[0023] Figure 2 This is a graph showing the change of melting rate over time during vacuum consumable remelting in Comparative Example 2 of the present invention;

[0024] Figure 3 This is a graph showing the change of melting rate over time during vacuum consumable remelting in Example 1 of the present invention;

[0025] Figure 4 This is a graph showing the change in melting rate over time during the vacuum consumable remelting process in Example 2 of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The process parameters of the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0027] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0028] In a first aspect, the present invention provides a method for preparing a high-Mo, Al, Ti type nickel-based high-temperature alloy, the preparation method comprising the following steps:

[0029] S1, annealing the consumable electrode at a temperature of 1130° C. to 1200° C. (for example, 1130° C., 1150° C., 1180° C., or 1200° C.);

[0030] S2. The annealed consumable electrode is remelted in vacuum to obtain a consumable steel ingot of a nickel-based high-temperature alloy with high Mo, Al and Ti content.

[0031] The preparation method provided by the present invention effectively solves the technical problem of large melting rate fluctuation during vacuum consumable remelting of high Mo, Al and Ti type nickel-based high-temperature alloys by increasing the annealing temperature of the consumable electrode, thereby reducing the melting rate fluctuation of the consumable electrode.

[0032] The present invention can avoid the precipitation of the strengthening phase γ' phase and carbide during the low-temperature annealing process by increasing the electrode annealing temperature, and prevent the continuous increase of tissue stress from inducing cracking of the electrode core. The present invention further proves that the main reason for the large fluctuation of the melting rate during the vacuum consumable remelting process of high Mo, Al, Ti type nickel-based high-temperature alloys is the quality problem of the electrode core. The process effectively solves the technical problem of unstable smelting of vacuum consumable remelting of high Mo, Al, Ti type nickel-based high-temperature alloys.

[0033] In the preparation method of the above-mentioned high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation mode, the composition of the high Mo, Al, Ti type nickel-based high-temperature alloy is as follows by mass percentage: C≤0.12%, Cr 18.00%~20.00%, Co10.00%~12.00%, Mo9.00%~10.50%, Al 1.40%~1.70%, Ti 3.00%~3.30%, B0.003%~0.010%, Zr≤0.07%, Fe≤5.00%, Mn≤0.10%, Si≤0.50%, P≤0.015%, S≤0.015%, Cu≤0.50%, and the balance is Ni and unavoidable impurities.

[0034] In the above-mentioned method for preparing high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation mode, the consumable electrode is obtained by smelting in a vacuum induction furnace and then casting.

[0035] Specifically, the present invention provides a method for preparing a high-Mo, Al, Ti type nickel-based high-temperature alloy. The preparation method comprises smelting a high-Mo, Al, Ti type nickel-based high-temperature alloy ingot by a dual process. For example, the nickel-based high-temperature alloy is obtained by vacuum induction smelting + vacuum consumable remelting smelting, wherein the vacuum induction smelting process adopts a conventional process in the art, and the present invention does not improve it, but mainly improves the annealing temperature.

[0036] In the preparation method of the above-mentioned high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation, in step S1, the cast consumable electrode is sent to an annealing furnace within 60 minutes after demolding, and annealed at a temperature of 1130°C-1200°C (for example, 1130°C, 1150°C, 1170°C, 1200°C) for 10-20h (for example, 10h, 12h, 14h, 16h, 18h or 20h), and then cooled with the furnace to no more than 450°C, and then taken out of the furnace for air cooling away from wind. If the furnace temperature is too high, the surface temperature drops quickly and the core temperature drops slowly, resulting in uneven cooling gradients between the edge and the core, causing cracking. The embodiment of the present invention is mainly to ensure that the core of the electrode is slowly cooled by cooling to no more than 450°C with the furnace and then taken out of the furnace, reducing the temperature gradient of the electrode cross section, and effectively avoiding cracking caused by uneven cooling gradients between the edge and the core.

[0037] In the above-mentioned method for preparing high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation, after step S1 and before step S2, the preparation method further includes: sawing, grinding wheel peeling and welding the annealed consumable electrode.

[0038] In the preparation method of the above-mentioned high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation method, during the vacuum induction furnace smelting process, the refining vacuum degree is ≤2.7Pa, the leakage rate is ≤7.5Pa / min, the refining time is >30min, the refining temperature is 1430-1500℃, the steel tapping temperature is 1440-1480℃, and the molten steel cast in the ingot mold is cooled in a vacuum environment for 40-60min before breaking the air and demolding.

[0039] In the preparation method of the above-mentioned high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation method, during the vacuum consumable remelting process, in the arc starting stage, the voltage is 21-25V, the current is 4-8KA, and the melting rate in the stable stage of the vacuum consumable remelting is 3-5kg / min (if the melting rate is too large, black spot metallurgical defects will be produced, and if it is too small, white spot metallurgical defects will be produced, and production efficiency will be affected.).

[0040] In the above-mentioned preparation method of high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation method, during the vacuum consumable remelting process, after the ingot weight reaches 9-11% of the total weight of the consumable electrode, helium is introduced into the crystallizer through the equipment cooling gas pipeline, and the helium pressure is 300Pa-500Pa.

[0041] In the preparation method of the above-mentioned high Mo, Al, Ti type nickel-based high-temperature alloy, as an optional implementation method, during the vacuum consumable remelting process, when the remaining consumable electrode weight reaches 5%-9% of the initial consumable electrode total weight, the shrinkage feeding begins, and when the remaining consumable electrode weight reaches 1%-3% of the initial consumable electrode total weight, the shrinkage feeding ends and the power is cut off.

[0042] In a second aspect, the present invention provides a high-Mo, Al, Ti type nickel-based high-temperature alloy, and the high-Mo, Al, Ti type nickel-based high-temperature alloy is prepared by the preparation method described in the first aspect.

[0043] The present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0044] Example 1

[0045] The present embodiment provides a method for preparing a high-Mo, Al, Ti type nickel-based high-temperature alloy. The high-Mo, Al, Ti type nickel-based high-temperature alloy comprises, by mass percentage, C: 0.08%, Cr: 19.0%, Mo: 9.8%, Co: 11.0%, Al: 1.55%, Ti: 3.20%, B: 0.006%, Zr: 0.04%, Fe: 2.5%, Mn: 0:01%, Si: 0.01%, P: 0.003%, S: 0.0005%, Cu: 0.010%, and the balance is Ni and unavoidable impurities; the preparation method of the high-Mo, Al, Ti type nickel-based high-temperature alloy has the following process: VIM (vacuum induction furnace smelting) → casting 3t consumable electrode → Consumable electrode annealing → Sawing, grinding wheel peeling, welding → Vacuum consumable remelting smelting Consumable ingots;

[0046] Among them, during the smelting process in the vacuum induction furnace: weigh the raw materials according to the requirements of the high Mo, Al, Ti type nickel-based high-temperature alloy composition, add the raw materials into the vacuum induction furnace for smelting, the refining vacuum degree ≤2.7Pa, the leakage rate ≤7.5Pa / min, the refining time is 50min, the refining temperature is 1480℃, the steel tapping temperature is 1460℃, the molten steel obtained after the smelting is cast in the ingot mold, and 3t of consumable electrodes are cast. The molten steel cast in the ingot mold is cooled in a vacuum environment (vacuum degree ≤ 2.7Pa) for 50 minutes and then begins to break the air and demould. Within 50 minutes after demoulding, the consumable electrode is transferred to a high-temperature annealing furnace prepared in advance;

[0047] During the annealing process of the consumable electrode: the specific furnace temperature is set at 1180°C, the electrode is kept warm for 13 hours, the fire is turned off, the furnace is cooled to 450°C, and then the electrode is taken out of the furnace and air-cooled away from wind, thus obtaining a VIM electrode that has been annealed at high temperature;

[0048] During the sawing, grinding wheel peeling and welding process: the head and tail of the annealed electrode ingot are cut off by sawing machine; the high-temperature alloy vacuum consumable electrode is welded to the dummy electrode by argon arc welding method, and the straightness is checked after welding;

[0049] During the vacuum consumable remelting process: the arc starting time is 60 minutes, the voltage in the arc starting stage is set to 24V, and the current is set to 7KA; the melting rate in the stable stage is set to 3.7Kg / min. After the consumable steel ingot reaches 300Kg, helium gas is introduced into the crystallizer through the equipment cooling gas pipeline. The helium pressure is 400Pa. When the remaining consumable electrode weight reaches 200Kg, the shrinkage is started. When the remaining consumable electrode weight reaches 40Kg, the shrinkage is ended and the power is cut off. The vacuum consumable remelting process is very stable, and the melting rate fluctuation range is within ±5%. The vacuum consumable curve (melting rate change over time) is as follows Figure 3 shown.

[0050] The nickel-based high-temperature alloy consumable steel ingot produced in this embodiment is subjected to forging hot processing, and the surface cracking is observed during the forging process, and the flaw detection and low magnification conditions are inspected after the product is formed. The inspection results show that the nickel-based high-temperature alloy consumable steel ingot produced in this embodiment is not easy to crack during the forging process, and the inspection pass rate after the product is high.

[0051] Example 2

[0052] The present embodiment provides a method for preparing a high-Mo, Al, and Ti type nickel-based high-temperature alloy. The high-Mo, Al, and Ti type nickel-based high-temperature alloy comprises, by mass percentage, C: 0.08%, Cr: 19.0%, Mo: 9.8%, Co: 11.0%, Al: 1.55%, Ti: 3.20%, B: 0.006%, Zr: 0.04%, Fe: 2.5%, Mn: 0:01%, Si: 0.01%, P: 0.003%, S: 0.0005%, Cu: 0.010%, and the balance is Ni and unavoidable impurities; the preparation method of the high-Mo, Al, and Ti type nickel-based high-temperature alloy is basically the same as that of Example 1, except that: during the annealing process of the consumable electrode, the annealing heating temperature is different. The annealing heating temperature of the present embodiment is set to 1150° C. After the electrode is kept warm for 13 hours, the fire is turned off, and the electrode is cooled to 450° C. with the furnace and then taken out of the furnace for air cooling in a windproof manner, thereby obtaining a VIM electrode annealed at a high temperature. The vacuum consumable remelting process of this embodiment is very stable, and the melting rate fluctuation range is within ±8%. The vacuum consumable curve (melting rate change over time) is as follows: Figure 4 shown.

[0053] The nickel-based high-temperature alloy consumable steel ingot produced in this embodiment is subjected to forging hot processing, and the surface cracking is observed during the forging process. After the material is formed, the flaw detection and low magnification conditions are inspected. The inspection results show that the nickel-based high-temperature alloy consumable steel ingot produced in this embodiment is not easy to crack during the forging process and has a high inspection pass rate.

[0054] Comparative Example 1

[0055] The comparative example provides a preparation method of a high-Mo, Al, and Ti type nickel-based high-temperature alloy, wherein the high-Mo, Al, and Ti type nickel-based high-temperature alloy comprises, by mass percentage, C: 0.08%, Cr: 19.0%, Mo: 9.8%, Co: 11.0%, Al: 1.55%, Ti: 3.20%, B: 0.006%, Zr: 0.04%, Fe: 2.5%, Mn: 0:01%, Si: 0.01%, P: 0.003%, S :0.0005%,Cu:0.010%,the balance is Ni and inevitable impurities; The preparation method of the high Mo, Al, Ti type nickel-based high temperature alloy is basically the same as that of Example 1, except that: during the annealing process of the consumable electrode, it is kept at a low temperature of 600℃ for 3 hours, and then the temperature is raised to the set annealing temperature of 930℃ at 60℃ / h for annealing. After the electrode is kept at a temperature of 10 hours, the fire is turned off, and the furnace is cooled to 450℃ and then taken out of the furnace to be air-cooled to obtain the annealed VIM electrode. High Mo, Al, Ti type nickel-based high temperature alloy prepared by the annealing process The melting rate of the consumable electrode fluctuates greatly during the vacuum consumable remelting process, with a melting rate fluctuation range of about ±40%. The vacuum consumable curve (melting rate versus time) is shown in Figure 1 shown.

[0056] The nickel-based high-temperature alloy consumable steel ingot produced in this comparative example was subjected to forging hot processing, and surface cracking was observed during the forging process. The inspection results show that the nickel-based high-temperature alloy consumable steel ingot produced in this comparative example has poor plasticity and is prone to cracking during the forging process.

[0057] Comparative Example 2

[0058] The present comparative example provides a method for preparing a high-Mo, Al, and Ti type nickel-based high-temperature alloy, wherein the high-Mo, Al, and Ti type nickel-based high-temperature alloy comprises, by mass percentage, 0.08% C, 19.0% Cr, 9.8% Mo, 11.0% Co, 1.55% Al, 3.20% Ti, 0.006% B, 0.04% Zr, 2.5% Fe, 0.01% Mn, 0.01% Si, and 0.00% P. 3%, S: 0.0005%, Cu: 0.010%, the balance is Ni and unavoidable impurities; the preparation method of the high Mo, Al, Ti type nickel-based high temperature alloy is basically the same as that of Example 1, except that: during the annealing process of the consumable electrode, the annealing heating temperature is different. The annealing heating temperature of this comparative example is set to 1100°C. After the electrode is kept warm for 13 hours, the fire is turned off, and the furnace is cooled to 450°C and then taken out of the furnace to be air-cooled in a wind-proof manner, thus obtaining a VIM electrode after high-temperature annealing. High Mo, Al, Ti type nickel-based high temperature alloy prepared by this annealing process The melting rate of the consumable electrode still fluctuates greatly during the vacuum consumable remelting process, and the melting rate fluctuation range is about ±30%. The vacuum consumable curve (melting rate change over time) is as follows: Figure 2 shown.

[0059] The nickel-based high-temperature alloy consumable steel ingot produced in this comparative example was subjected to forging hot processing, and surface cracking was observed during the forging process. The inspection results show that the nickel-based high-temperature alloy consumable steel ingot produced in this comparative example has poor plasticity and is prone to cracking during the forging process.

[0060] The results shown in Table 1 are obtained through the above examples and comparative examples:

[0061] Table 1

[0062] serial number Melting rate fluctuation range Forging quality Example 1 Within ±5% Not prone to cracking during forging Example 2 Within ±8% Not prone to cracking during forging Comparative Example 1 ±40% Prone to cracking during forging Comparative Example 2 ±30% Prone to cracking during forging

[0063] From Table 1 we can at least see that:

[0064] By comparing Examples 1 and 2 with Comparative Examples 1 and 2, it can be seen that the preparation method provided by the present invention effectively solves the technical problem of large fluctuations in melting rate during vacuum consumable remelting of high Mo, Al, Ti type nickel-based high-temperature alloys by increasing the annealing temperature of the consumable electrode, reduces the fluctuations in melting rate of the consumable electrode, and improves the forging quality.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a high-Mo, Al, Ti type nickel-based high-temperature alloy, characterized in that: The preparation method comprises the following steps: S1, annealing the consumable electrode at a temperature of 1130° C. to 1200° C.; S2. The annealed consumable electrode is subjected to vacuum consumable remelting to obtain a consumable ingot of a nickel-based high-temperature alloy with high Mo, Al and Ti content.

2. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: The composition of the high Mo, Al, Ti type nickel-based high-temperature alloy is as follows by mass percentage: C≤0.12%, Cr 18.00%-20.00%, Co10.00%-12.00%, Mo9.00%-10.50%, Al 1.40%-1.70%, Ti 3.00%-3.30%, B0.003%-0.010%, Zr≤0.07%, Fe≤5.00%, Mn≤0.10%, Si≤0.50%, P≤0.015%, S≤0.015%, Cu≤0.50%, and the balance is Ni and unavoidable impurities.

3. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: The consumable electrode is obtained by smelting in a vacuum induction furnace and then casting.

4. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: In step S1, the cast consumable electrode is sent to an annealing furnace within 60 minutes after demoulding, and annealed at a temperature of 1130°C-1200°C for 10-20 hours, then cooled to no higher than 450°C with the furnace, and then taken out of the furnace and cooled in air.

5. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: After step S1 and before step S2, the preparation method further comprises: sawing, grinding wheel peeling and welding the annealed consumable electrode.

6. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 3, characterized in that: During the vacuum induction furnace smelting process, the refining vacuum degree is ≤2.7Pa, the leakage rate is ≤7.5Pa / min, the refining time is >30min, the refining temperature is 1430-1500°C, the tapping temperature is 1440-1480°C, and the molten steel cast in the ingot mold is cooled in a vacuum environment for 40-60min before breaking through the air and demolding.

7. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: During the vacuum consumable remelting process, in the arc starting stage, the voltage is 21-25V, the current is 4-8KA, and the melting rate in the vacuum consumable remelting stable stage is 3-5kg / min.

8. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: During the vacuum consumable remelting process, after the ingot weight reaches 9-11% of the total weight of the consumable electrode, helium is introduced into the crystallizer through the equipment cooling gas pipeline, and the helium pressure is 300Pa-500Pa.

9. The method for preparing a high Mo, Al, Ti type nickel-based high-temperature alloy according to claim 1, characterized in that: During the vacuum consumable remelting process, when the remaining consumable electrode weight reaches 5% to 9% of the initial consumable electrode total weight, the feeding starts, and when the remaining consumable electrode weight reaches 1% to 3% of the initial consumable electrode total weight, the feeding ends and the power is cut off.

10. A high Mo, Al, Ti type nickel-based high temperature alloy, characterized in that: The high Mo, Al, Ti type nickel-based high-temperature alloy is prepared by the preparation method described in any one of claims 1 to 9.

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