CN102912152B - Vacuum arc remelting method for inhibiting macrosegregation of high-temperature alloy with high content of Nb - Google Patents
Vacuum arc remelting method for inhibiting macrosegregation of high-temperature alloy with high content of Nb Download PDFInfo
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Abstract
The invention discloses a vacuum arc remelting method for inhibiting the macrosegregation of high-temperature alloy with high content of Nb, comprising the following steps: subjecting the high-temperature alloy with high content of Nb to vacuum arc remelting, wherein in the normal remelting process, the melting pressure is controlled at 22-30V, the melting current is controlled at 5,000-7,000A, and the molten drip rate is controlled at 6-8 drops per second; and cooling by water and helium filling, wherein the pressure of the helium is controlled at 300-500Pa. The invention further discloses the high-temperature alloy with high content of Nb, which is obtained by melting by adopting the method. According to the characteristics of a vacuum arc furnace and the characteristic that the high-temperature alloy with high content of Nb is easy to be subjected to macrosegregation in the process remelting by using the vacuum arc furnace, the vacuum arc remelting process parameters can be formulated reasonably, the macro component segregation is prevented and inhibited effectively. The product obtained by melting has good quality, high production efficiency and significant economic benefit.
Description
Technical field
The invention belongs to the superalloy melting field in metallurgy industry, relate to the alloy mass control method in high-temperature alloy vacuum electric arc reflow process, more particularly, relate to a kind of vacuum arc remelting method that suppresses the superalloy macrosegregation of high Nb content.
Background technology
Metal Nb is a kind of refractory metal, and fusing point is that 2468 ℃, boiling point are 4742 ℃; At superalloy, add the welding property that Nb can improve alloy, carry heavy alloyed hot strength and antioxidant property.Thereby, having in numerous superalloys and contain Nb, the conventional main chemical compositions containing Nb superalloy is in Table 1.As can be seen from Table 1, by weight percentage, as the Nb content requirement in GH4169, GH2907 and GH2909 alloy is respectively 4.8～5.5%, 4.3～5.2% and 4.3～5.2%, the superalloy that belongs to high Nb content, its smelting technology route is generally vacuum induction furnace smelting+vacuum arc remelting, as adopt the electrode bar of 6 tons of vacuum induction furnace smelting φ 440mm, then adopt the vacuum arc remelting of 3 tons of titanium/6 ton steel to become the high-temperature alloyed steel ingot of φ 508mm.
Table 1 is containing Nb superalloy main chemical compositions (wt%)
| Steel grade | C | Mn | Si | Ni | Cr | W | V |
| GH690 | 0.015～0.025 | ≤0.50 | ≤0.50 | More than | 28.0～31.0 | ||
| GH2036 | 0.34～0.40 | 7.50～9.50 | 0.30～0.80 | 7.0～9.0 | 11.5～13.5 | 1.25～1.55 | |
| GH4648 | ≤0.10 | ≤0.50 | ≤0.40 | More than | 32.0～35.0 | 4.3～5.3 | |
| GH4145 | ≤0.08 | ≤0.35 | ≤0.35 | More than | 14.0～17.0 | ||
| GH2150 | ≤0.10 | ≤0.60 | ≤0.30 | 43.0～47.0 | 14.0～16.0 | 2.5～3.5 | |
| GH3039 | ≤0.08 | ≤0.40 | ≤0.80 | More than | 19.0～22.0 | ||
| GH4133 | ≤0.07 | ≤0.35 | ≤0.65 | More than | 19.0～22.0 | ||
| GH783 | ≤0.03 | ≤0.50 | ≤0.50 | 26.0～30.0 | 2.5～3.5 | ||
| GH625 | ≤0.10 | ≤0.50 | ≤0.50 | More than | 20.0～23.0 | ||
| GH2909 | ≤0.06 | ≤1.00 | 0.07～0.35 | 35.0～40.0 | ≤1.00 |
| GH2909 | ≤0.06 | ≤1.00 | 0.25～0.50 | 35.0～40.0 | ≤1.00 | ||
| GH4169 | 0.02～0.06 | ≤0.35 | ≤0.35 | 50.0～55.0 | 17.0～21.0 |
Continued 1 is containing the main chemical compositions (wt%) of Nb superalloy
| Steel grade | Mo | Al | Ti | Cu | Fe | Nb | Co |
| GH690 | ≤0.50 | ≤0.50 | ≤0.50 | 8.0～11.0 | ≤0.10 | ≤0.035 | |
| GH2036 | 1.10～1.40 | ≤0.12 | More than | 0.25～0.50 | |||
| GH4648 | 2.30～3.30 | 0.50～1.10 | 0.50～1.10 | ≤4.0 | 0.50～1.10 | ||
| GH4145 | 0.40～1.00 | 2.55～2.75 | ≤0.50 | 5.00～9.00 | 0.70～1.20 | ≤1.00 | |
| GH2150 | 4.0～5.2 | 0.9～1.4 | 1.9～2.4 | More than | 0.8～1.5 | ||
| GH3039 | 1.80～2.30 | 0.35～0.75 | 0.35～0.75 | ≤0.20 | ≤3.00 | 0.90～1.30 | |
| GH4133 | 0.70～1.20 | 2.50～3.00 | ≤0.07 | ≤1.50 | 1.15～1.65 | ||
| GH783 | 5.0～6.0 | ≤0.40 | ≤0.50 | 2.5～3.5 | More than | ||
| GH625 | 8.0～10.0 | ≤0.40 | ≤0.40 | ≤5.0 | 3.15～4.15 | ≤1.0 | |
| GH2907 | ≤0.15 | 1.3～1.8 | ≤0.50 | More than | 4.3～5.2 | 12.0～16.0 | |
| GH2909 | ≤0.15 | 1.3～1.8 | ≤0.50 | More than | 4.3～5.2 | 12.0～16.0 | |
| GH4169 | 2.80～3.30 | 0.30～0.70 | 0.75～1.15 | ≤0.20 | More than | 4.80～5.50 | ≤1.0 |
It is very difficult that superalloy obtains the completely uniform steel ingot of chemical composition in process of setting.In general, after superalloy solidifies, different positions on cross section, all there is inhomogeneous phenomenon in chemical composition, and the non-uniform phenomenon of this composition is that the reallocation that exists solute in process of setting causes.In solidifying, liquid phase is different from solid concentration, the solid phase of first separating out from after the solid state chemistry composition of separating out different, even in a crystal grain, each microcell solidifies successively differently, its chemical composition is also variant, the ununiformity of this chemical composition is called segregation.Segregation is divided into two large classes, i.e. microsegregation and macrosegregation.Microsegregation is to produce in less scope, refers generally in a grain colony, also referred to as short distance segregation.Macrosegregation produces in larger size range, also referred to as regional segregation or long-range segregation.
Vacuum arc fumace has another name called consumable electrode vacuum furnace, it is a kind of special smelting equipment that carries out melting under vacuum, its melting and ingot casting are to complete in same system, limit edge-melting casting, be not subject to refractory materials to pollute molten steel, can effectively remove gas content, inclusion in material, obtain compact structure, and then improve superalloy clarity and quality of materials, be comparatively ideal secondary remelting equipment.
In actual production, the superalloy of high Nb content easily forms the segregation of Nb element in During Ingot Solidification, the macrostructure of GH4169 alloy as shown in Figure 1 and Figure 2, the microstructure of GH2909 alloy, cause separating out in interdendritic the white block Laves phase of rich Nb.The reason that produces above-mentioned macrosegregation has two: the firstth, to solidify in early days, and the floating of solid phase or liquid phase is sunk motion and the regional segregation that causes; The secondth, in solid-liquid two-phase region, liquid flows and the regional segregation that causes along dendrite.Removing method mainly contains: equilibrium freezing and its segregation-free is produced; Crystal grain thinning and make segregation not obvious; Rapid solidification and make solute have little time to distribute; Homogenizing annealing elimination etc.Wherein, equilibrium freezing is difficult to realize in actual production; Crystal grain thinning needs material to have good thermoplasticity just can reach, and the alloy strength of the superalloy of high Nb content is large, hot-workability is poor, thereby it is large to realize difficulty; Homogenizing annealing is processed can only improve microsegregation, and when finding macrosegregation, often segregation degree is comparatively serious, thereby the effect that homogenizing annealing improves macrosegregation is unconspicuous.
Therefore, need to find a kind of from source with fundamentally reduce or avoid the effective ways of the superalloy macrosegregation of high Nb content.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to solve the one or more problems that exist in above-mentioned prior art.
The object of the present invention is to provide and a kind ofly use quick setting method and from source with fundamentally suppress the vacuum arc remelting method of superalloy macrosegregation of high Nb content and the superalloy obtaining according to the method.
To achieve these goals, an aspect of of the present present invention provides a kind of vacuum arc remelting method that suppresses the superalloy macrosegregation of high Nb content, the superalloy electrode bar of high Nb content is carried out to vacuum arc remelting, in normal reflow process, controlling melting voltage is that 22～30V, melting electric current are that 5000～7000A, molten drop speed are 6～8/s, and adopt water-cooled and the type of cooling of filling helium gas cooling and combining, wherein, helium pressure is 300～500Pa.
An embodiment of the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to the present invention, described high Nb superalloy electrode bar obtains by vacuum induction furnace smelting.
An embodiment of the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to the present invention, described vacuum arc remelting method also comprises the step that high Nb superalloy electrode bar is welded on the dummy electrode in vacuum arc fumace under vacuum condition and breaks NULLCHECK welding quality.
An embodiment of the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to the present invention, described vacuum arc remelting method reduces the step that melting electric current carries out ingot head filling after being also included in normal reflow process gradually.
An embodiment of the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to the present invention, the described step that reduces gradually melting electric current specifically adopts step type to reduce gradually melting electric current, the hold-time of every one-level melting electric current is 3～20 minutes, and the total time that described ingot head is filled is 30～90min.
Another aspect of the present invention also provides a kind of superalloy of high Nb content, and described superalloy is smelted and obtained by the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of above-mentioned inhibition.
According to the superalloy of high Nb content of the present invention embodiment, by weight percentage, the Nb content in described superalloy is 4.3～5.5%.
According to the superalloy of high Nb content of the present invention embodiment, by weight percentage, the Nb content in described superalloy is 4.55～5.48%.
The present invention is according to the equipment characteristic of vacuum arc fumace, in conjunction with being prone to the feature of macrosegregation in high Nb content high-temperature alloy vacuum electric arc reflow process, rational vacuum arc remelting processing parameter, effectively prevent and suppressed the generation of macroscopical component segregation situation, good product quality, the production efficiency of melting are high, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 shows the macrostructure of GH4169 alloy macrosegregation place in prior art.
Fig. 2 shows the microstructure of GH2909 alloy macrosegregation place in prior art.
Fig. 3 is the schematic diagram that molten bath changes under Different Cooling Conditions.
Fig. 4 shows the low power picture of the GH4169 alloy without macrosegregation that example of the present invention smelts.
Fig. 5 shows the high power picture of the GH4169 alloy without macrosegregation that example of the present invention smelts.
Description of reference numerals:
1-is molten bath, the 2-water-cooled under water-cooled condition and fill the molten bath under helium gas cooling condition only.
Embodiment
Hereinafter, in connection with exemplary embodiment, describe the vacuum arc remelting method of superalloy macrosegregation of the high Nb content of inhibition of the present invention and the superalloy obtaining according to the method in detail.
Thinking of the present invention is to adopt the method for rapid solidification, makes solute have little time to distribute, thereby reduces or avoid the macrosegregation phenomenon in vacuum arc remelting process, reaches the object that suppresses macrosegregation.
The vacuum arc remelting method that suppresses according to an exemplary embodiment of the present invention the superalloy macrosegregation of high Nb content, the superalloy electrode bar of high Nb content is carried out to vacuum arc remelting, in normal reflow process, controlling melting voltage is that 22～30V, melting electric current are that 5000～7000A, molten drop speed are 6～8/s, and adopt water-cooled and the type of cooling of filling helium gas cooling and combining, wherein, helium pressure is 300～500Pa.
According to the present invention, in the normal remelting stage, mainly by adopting the mode of molten drop rate-controlling and supplementary helium gas cooling rationally to control the technological process of remelting, until complete the normal remelting stage, enter head and fill the stage.
Wherein, in vacuum arc remelting process, conventionally adopt low voltage, large electric current technique to carry out remelting, so steel ingot size (φ 305mm～φ 660mm) no matter, melting voltage is all less than 45V, and it is that 22～30V is advisable that the present invention controls.
Experiment Parameter rule of thumb and repeatedly, adjustment and optimization, when melting electric current is during at 5000～7000A, molten speed is stable, molten bath is steady, shallow when dark while having avoided because of molten fast sometimes fast and sometimes slow caused pool depth,, even there is macrosegregation in the homogeneity of having avoided solidification rate influence of fluctuations material.
Molten drop speed response dropping frequency and the granular size of molten drop during electrode melting in vacuum arc remelting process, by molten drop rate-controlling, be that 6～8/s is favourable to the arc length of controlling in vacuum arc remelting process.The present invention mainly adopts molten drop to control for the control of electrode melting, and do not adopt the mode of controlled melting speed, when taking Melting rate control, because each position quality of electrode bar there are differences, thereby there is in reflow process the length of the electric arc large defect that fluctuates, and while adopting molten drop to control, the fluctuation of electric arc arc length is less, also less to molten bath disturbing influence.Generally speaking, molten drop speed electrical control cabinet in vacuum arc furnace apparatus is controlled, the numbers of particles that this electrical control cabinet drops to molten bath by " with the analog input module of useful range submodule " in programmable logic control system (PLC) to molten drop in normal reflow process detects, conventionally when whereabouts particle hour is not give recording, feed back and show very much, thereby above-mentioned molten drop speed is a relative value, rather than absolute value.
The present invention adopts water-cooled and the type of cooling of filling helium gas cooling and combining, and wherein, the pressure of helium is 300～500Pa, this can improve the rate of cooling of vacuum arc remelting, and then carry heavy alloyed solidification rate, and also can crystal grain thinning, dwindle dendritic arm distance, alleviate or avoid macrosegregation.When if the cooling pressure values of helium is higher, helium likely breaks through mushy zone and molten bath district and enters top, molten bath, causes the fluctuation vacuum of reflow process, causes that vacuum arc remelting process is unstable and Ingot Surface Quality is poor; If the cooling pressure values of helium low compared with time, cooling intensity and effect are poor, do not reach and improve melting pool shape and ingot structure's effect.
Helium has the incomparable heat conductivity of other gas and inertness, and helium is the most inactive element, almost can not with other any element chemical combination, thereby helium is mainly working fluid during as shielding gas, air cooling and superfreeze agent etc.Helium under room temperature is filled with behind the gap between steel ingot and crystallizer, and along with the heat transfer effect of convection current and conduction, temperature can rise, and mainly by control pressure, controls its temperature and realizes cooling object.In vacuum arc remelting process of the present invention, when adopting circulating water (be melt tank edge contact with water mold position take away molten bath heat with conduction pattern), increase and fill helium gas cooling, particularly, the steel ingot of bottom, molten bath forms gap due to contraction and between crystallizer, at this place, be filled with helium as medium, with convection current, radiation, conduction pattern is taken away the heat in steel ingot and molten bath, water-cooled of the present invention with fill the type of cooling that helium gas cooling combines and can reduce pool depth and the solid-state and liquid thickness of seeing mushy zone, make molten bath flattening (as shown in Figure 3), allow molten bath keep a regular flat inverted cone shape.In vacuum arc remelting process and the in the situation that electrode melting speed being constant, increase cooling intensity, can make solidification rate accelerate, thereby pool depth and volume will reduce, thereby making molten bath flattening, this can crystal grain thinning, dwindle dendritic arm distance, alleviates component segregation.Thereby adopting water-cooled and filling helium gas cooling molten bath is the effective measure that alleviate or avoid the macrosegregation of high-temperature alloy vacuum electric arc reflow process.
Particularly, the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition of the present invention can also comprise the steps such as vacuum induction furnace smelting electrode bar, electrode welding, the starting the arc, formation molten bath before the normal remelting stage, after the normal remelting stage, can also comprise the head filling stage, come out of the stove cooling, strip off the skin, the step such as thermal treatment, but be not limited to this.
In one exemplary embodiment of the present invention, by vacuum induction furnace smelting, obtain the high Nb superalloy electrode bar of vacuum arc remelting, but be not limited to this.
In one exemplary embodiment of the present invention, vacuum arc remelting method of the present invention also comprises the step that high Nb superalloy electrode bar is welded on the dummy electrode in vacuum arc fumace under vacuum condition and breaks NULLCHECK welding quality.
In one exemplary embodiment of the present invention, vacuum arc remelting method of the present invention reduces the step that melting electric current carries out ingot head filling after being also included in normal reflow process gradually.Wherein, the above-mentioned step that reduces gradually melting electric current specifically adopts step type to reduce gradually melting electric current, and the hold-time of every one-level melting electric current is 3～20 minutes, and the total time that described ingot head is filled is 30～90min.Wherein, the processing parameter that ingot head is filled is as shown in table 2, but because filling part is not the emphasis of vacuum arc remelting, generally filling position is in follow-up hot procedure, to excise, the object of filling is mainly that the shrinkage cavity of vacuum arc remelting steel ingot is reduced, improve the lumber recovery of steel ingot, so the present invention does not introduce in detail to the ingot head stage of filling.
The processing parameter that table 2 ingot head is filled
| Electric current (KA) | Voltage (V) | Molten drop speed (dripping/s) | Hold-time (min) |
| 6 | 23 | 9.5 | 3 |
| 5 | 22.8 | 10 | 5 |
| 4 | 22.6 | 10 | 10 |
| 3 | 22.5 | 10 | 20 |
| 2.5 | 22 | 10 | 5 |
| 2 | 21.7 | 10 | 5 |
| 2 | 20 | 10 | 0 |
Another aspect of the present invention also provides a kind of superalloy of high Nb content, and described superalloy is smelted and obtained by the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of above-mentioned inhibition.According to the present invention, by weight percentage, the Nb content in the superalloy of above-mentioned high Nb content can be preferably 4.55～5.48% for 4.3～5.5%, Nb content.Wherein, use the actual smelting of the present invention and remelting steel grade, the corresponding Nb content of heat (batch) number as shown in table 3.
The actual smelting of table 3 and remelting steel grade, the Nb content that heat (batch) number is corresponding
| Steel grade | Heat (batch) number | Nb content (%) | Steel grade | Heat (batch) number | Nb content (%) |
| GH2909 | T12M4-3 | 4.55 | GH4169 | T11M4208 | 5.32 |
| GH907 | T12M430 | 4.8 | GH4169 | T11M4209 | 5.34 |
| GH907 | T11M4211 | 4.89 | GH4169 | T12M4153 | 5.35 |
| GH4169 | T12M486 | 5.19 | GH4169 | T12M4152 | 5.41 |
| GH4169 | T07R22 | 5.25 | GH4169 | T11M4111 | 5.48 |
Enumerating concrete example is below further elaborated exemplary embodiment of the present invention.Example is only for the present invention is described, and not limits by any way the present invention.Wherein related degree unless otherwise noted, is all weight percentage.
Because the Nb content requirement in GH4169, GH2907 and GH2909 alloy is respectively: 4.8～5.5%, 4.3～5.2% and 4.3～5.2%, all belong to the higher superalloy containing Nb, and smelting technology route can be all vacuum induction furnace smelting+vacuum arc remelting, be specifically as follows the electrode bar that adopts 6 tons of vacuum induction furnace smelting φ 440mm, then adopt 3 tons of titanium/6 ton steel vacuum arc remelting to become the steel ingot of φ 508mm.Process is to GH4169 alloy 12 stoves, GH2907 alloy 4 stoves and GH2909 alloy 1 stove, amount to 17 stoves and carry out the experiment of the processing parameter of many rounds, adjust, optimize and solidify, confirm to adopt processing parameter of the present invention can make GH4169, the remelting in vacuum arc remelting process of the superalloy of GH2907 and the contour Nb content of GH2909 alloy is stable, and increase steel ingot cooling intensity, reduce bottom, molten bath, steel ingot top pasty state layer thickness, and make molten bath flattening, make solute have little time to distribute, and then alleviate or avoid occurring the defect of macrosegregation, GH4169, the composition of GH2907 and GH2909 alloy is as shown in table 1, concrete smelting technology step is as follows:
1) preparation of vacuum arc remelting electrode bar:
Melting φ 440mm electrode bar in 6 tons of vacuum induction furnaces; in smelting process, when adding Nb and after adding Nb, adopt three-phase main-frequency to stir 25～30min; in the low Argon of cast forehearth, make working chamber's internal pressure reach 10000～14000Pa; under argon shield atmosphere, controlling tapping temperature is 1460～1480 ℃.Charged tapping, pushing off the slag are filtered, and complete the cast of φ 440mm electrode bar, prepare the more shallow φ 440mm electrode bar of fine and close shrinkage cavity, then by φ 440mm electrode bar through cutting cap mouth and surface finish, complete the preparation work of electrode bar.
2) welding of electrode bar and the vacuum arc remelting starting the arc:
First, after vacuum degree of cold state reaches below 1Pa, carry out the welding of φ 440mm electrode bar, be welded on the dummy electrode of this steel; After having welded, broken NULLCHECK welding quality; After up-to-standard, close stove and again vacuumize, when vacuum tightness reaches 1Pa when following, the starting the arc material that electrifies, and improve gradually electric current, and strengthen burn-off rate, after forming, molten bath enters the normal remelting stage.
3) the normal remelting of vacuum arc remelting:
In normal reflow process, adopt water-cooled and the mode of filling helium gas cooling, and by controlling process parameter control molten drop, as follows to processing parameter settings such as melting voltage, melting electric currents: voltage is 22～30V; Electric current is 5000～7000A; Molten drop speed is 6～8/s; Fill helium gas cooling, its pressure is 300～500Pa, completes normal remelting to arriving the filling stage.For example, melting voltage is that 24V, melting electric current are 7000A, and molten drop speed is 8/s, and helium pressure is 400Pa.
4) filling of vacuum arc remelting:
After the normal remelting stage, for example, when electrode weight is 300～400kg, with step type, reduce gradually electric current, every one-level electric current keeps 3～20min, and the filling time amounts to 30～90min, the filling stage that completes φ 508mm steel ingot.
5) the coming out of the stove and stripping off the skin of the complete steel ingot of vacuum arc remelting:
Complete after filling, the cold 1h of stove, broken vacates stove, and air cooling, completes the smelting of φ 508mm steel ingot, follow-up vacuum arc remelting steel ingot is pulled out to skin.
6) subsequent production of vacuum arc fumace steel ingot:
Vacuum arc remelting steel ingot is carried out to the thermal treatments such as homogenizing, hot-work manufactures a finished product and the every physical and chemical project of finished product detects.
According to the low power of this example gained GH4196 alloy, mirco structure as shown in Figure 4, Figure 5 shown in, according to the mechanical property of the GH2907 alloy of this example gained, GH2909 alloy and GH4196 alloy as table
4, shown in table 5, table 6 and table 7.
The mechanical property detected result of table 4GH2907 alloy
The mechanical property detected result of table 5GH2909 alloy
The tensile property detected result of table 6GH4169 alloy
The high temperature endurance performance detected result of table 7GH4169 alloy
Known to table 8 according to Fig. 4 and Fig. 5, table 4, high power, macrostructure, the mechanical property of the superalloy of the high Nb content of the vacuum arc remelting method gained of the superalloy macrosegregation of the high Nb content of inhibition of the present invention are all qualified, and without the existence of macrosegregation defect, can meet the performance requriements of superalloy.
In sum, in vacuum arc remelting process, there is the metallurgical imperfection of macrosegregation in the superalloy that method of the present invention can suppress high Nb content effectively, improved the metallurgical quality of superalloy, the superalloy quality of the high Nb content of melting is good, production efficiency is high, remarkable in economical benefits.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, in the situation that do not depart from the spirit and scope of claim, can carry out various modifications to above-described embodiment.
Claims (6)
1. a vacuum arc remelting method that suppresses the superalloy macrosegregation of high Nb content, it is characterized in that, the superalloy electrode bar of high Nb content is carried out to vacuum arc remelting, in normal reflow process, controlling melting voltage is 22～30V, melting electric current is 5000～7000A, molten drop speed is 6～8/s, and adopt water-cooled and the type of cooling of filling helium gas cooling and combining, helium pressure is 300～500Pa, wherein, described vacuum arc remelting method reduces the step that melting electric current carries out ingot head filling after being also included in normal reflow process gradually, the described step that reduces gradually melting electric current adopts step type to reduce gradually melting electric current, the hold-time of every one-level melting electric current is 3～20 minutes, the total time that described ingot head is filled is 30～90 minutes.
2. the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to claim 1, is characterized in that, described high Nb superalloy electrode bar obtains by vacuum induction furnace smelting.
3. the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to claim 1, it is characterized in that, described vacuum arc remelting method also comprises the step that high Nb superalloy electrode bar is welded on the dummy electrode in vacuum arc fumace under vacuum condition and breaks NULLCHECK welding quality.
4. a superalloy for high Nb content, is characterized in that, the vacuum arc remelting method of described superalloy superalloy macrosegregation of the high Nb content of the inhibition described in any one in claims 1 to 3 is smelted and obtained.
5. the superalloy of high Nb content according to claim 4, is characterized in that, by weight percentage, the Nb content in described superalloy is 4.3～5.5%.
6. the superalloy of high Nb content according to claim 4, is characterized in that, by weight percentage, the Nb content in described superalloy is 4.55～5.48%.
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