CN102912152A - 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 the metallurgy industry, relate to the alloy mass control method in the 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 ℃; Add the welding property that Nb can improve alloy at superalloy, carry heavy alloyed hot strength and antioxidant property.Thereby, having in numerous superalloys and contain Nb, the main chemical compositions that contains the Nb superalloy commonly used sees Table 1.As can be seen from Table 1, by weight percentage, be respectively 4.8～5.5%, 4.3～5.2% and 4.3～5.2% such as the Nb content requirement in GH4169, GH2907 and the GH2909 alloy, 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, adopt again 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 contains 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 contains 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 |
Superalloy obtains the fully uniform steel ingot of chemical ingredients in process of setting be very difficult.In general, after superalloy solidifies, different positions on the cross section, all there is inhomogeneous phenomenon in chemical ingredients, and the non-uniform phenomenon of this composition is that the reallocation that exists solute in the process of setting causes.In solidifying, liquid phase is different from solid concentration, the solid phase of separating out first from after the solid state chemistry composition of separating out different, even each microcell solidifies successively differently in a crystal grain, its chemical ingredients is also variant, the ununiformity of this chemical ingredients is called segregation.Segregation is divided into two large classes, i.e. microsegregation and macrosegregation.Microsegregation is to produce in less scope, refers generally to be also referred to as the short distance segregation in a grain colony.Macrosegregation produces in larger size range, is 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 finish in same system, limit edge-melting casting, be not subjected to refractory materials to pollute molten steel, can effectively remove gas content, inclusion in the 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 forms the segregation of Nb element easily 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 the 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 come-up of solid phase or liquid phase is sunk motion and the regional segregation that causes; The secondth, liquid flows and the regional segregation that causes along dendrite in the solid-liquid two-phase region.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 then 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 realizes that difficulty is large; Homogenizing annealing is processed can only improve microsegregation, and when finding macrosegregation, often segregation degree is comparatively serious, thereby homogenizing annealing is unconspicuous to the effect that macrosegregation improves.
Therefore, need to seek a kind of from the 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 purpose of the present invention is to solve the one or more problems that exist in the above-mentioned prior art.
The object of the present invention is to provide and a kind ofly use quick setting method and from the source with fundamentally suppress the vacuum arc remelting method of superalloy macrosegregation of high Nb content and the superalloy that obtains 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 vacuum arc remelting, in normal reflow process, control 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 and is welded on the dummy electrode in the vacuum arc fumace under vacuum condition high Nb superalloy electrode bar and the step of broken 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 the melting electric current carries out the ingot head filling after also being 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 the melting electric current specifically adopts step type to reduce gradually the 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 by the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of above-mentioned inhibition and obtained.
According to an embodiment of the superalloy of high Nb content of the present invention, by weight percentage, the Nb content in the described superalloy is 4.3～5.5%.
According to an embodiment of the superalloy of high Nb content of the present invention, by weight percentage, the Nb content in the described superalloy is 4.55～5.48%.
The present invention is according to the equipment characteristic of vacuum arc fumace, in conjunction with the characteristics that are prone to macrosegregation in the 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, the good product quality of melting, production efficiency height, remarkable in economical benefits.
Description of drawings
Fig. 1 shows the macrostructure of GH4169 alloy macrosegregation place in the prior art.
Fig. 2 shows the microstructure of GH2909 alloy macrosegregation place in the prior art.
Fig. 3 is the synoptic diagram that the molten bath changes under Different Cooling Conditions.
The low power picture without the GH4169 alloy of macrosegregation that Fig. 4 shows that example of the present invention smelts.
The high power picture without the GH4169 alloy of macrosegregation that Fig. 5 shows that example of the present invention smelts.
Description of reference numerals:
1-is molten bath, the 2-water-cooled under the water-cooled condition and fill molten bath under the helium gas cooling condition only.
Embodiment
Hereinafter, describe the vacuum arc remelting method of superalloy macrosegregation of the high Nb content of inhibition of the present invention and the superalloy that obtains according to the method in detail in connection with exemplary embodiment.
Thinking of the present invention is to adopt the method for rapid solidification, makes solute have little time to distribute, thereby reduces or avoid macrosegregation phenomenon in the vacuum arc remelting process, reaches the purpose 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 vacuum arc remelting, in normal reflow process, control 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 rationally control the technological process of remelting by the mode that adopts molten drop rate-controlling and additional helium gas cooling, until finish the normal remelting stage, enter head and fill the stage.
Wherein, in the vacuum arc remelting process, usually 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 the present invention is controlled to be 22～30V and is advisable.
Rule of thumb and Experiment Parameter repeatedly, adjustment and optimization, when melting electric current during at 5000～7000A, molten speed is stable, the molten bath is steady, shallow when dark when having avoided because of the sometimes fast and sometimes slow pool depth that causes of molten speed, avoid the homogeneity of solidification rate influence of fluctuations material, even macrosegregation occurred.
The molten drop speed response dropping frequency and the granular size of molten drop during electrode melting in the vacuum arc remelting process, be that 6～8/s is favourable to the arc length in the control vacuum arc remelting process with the molten drop rate-controlling.The present invention mainly adopts molten drop 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 the large defective of the length fluctuation that has electric arc in the reflow process, and when adopting molten drop control, then the fluctuation of electric arc arc length is less, and is also less to the molten bath disturbing influence.Generally speaking, molten drop speed is controlled by electrical control cabinet in the vacuum arc furnace apparatus, this electrical control cabinet detects the numbers of particles that molten drop in the normal reflow process drops to the molten bath by " with the analog input module of useful range submodule " in the programmable logic control system (PLC), usually when the whereabouts particle hour be 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 the dendritic arm distance, alleviate or avoid macrosegregation.When if the cooling pressure values of helium is higher, helium might break through mushy zone and molten bath district and enter top, molten bath, causes the fluctuation vacuum of reflow process, causes the vacuum arc remelting process unstable and Ingot Surface Quality is poor; If the cooling pressure values of helium low than the time, then cooling intensity and effect are relatively poor, do not reach to 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 mainly is working fluid during as shielding gas, air cooling and superfreeze agent etc.After the helium under the room temperature was filled with slit between steel ingot and the crystallizer, along with the heat transfer effect of convection current and conduction, temperature can rise, and mainly controlled the purpose that its temperature realizes cooling by control pressure.In the vacuum arc remelting process of the present invention, when adopting circulating water (be melt tank edge contact with water mold position take away the molten bath heat with conduction pattern), increase and fill helium gas cooling, particularly, the steel ingot of bottom, molten bath is owing to shrink and form the gap between the crystallizer, be filled with helium as medium at this place, 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), namely allow the molten bath keep the flat inverted cone shape of a rule.In the vacuum arc remelting process and in the constant situation of electrode melting speed, increase cooling intensity, solidification rate is accelerated, thereby pool depth and volume will reduce, thereby making the molten bath flattening, this can crystal grain thinning, dwindle the dendritic arm distance, alleviates component segregation.Thereby adopting water-cooled and filling the 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 head filling stage, the cooling of coming out of the stove, strip off the skin, the step such as thermal treatment, but be not limited to this.
In one exemplary embodiment of the present invention, obtain the high Nb superalloy electrode bar of vacuum arc remelting by vacuum induction furnace smelting, but be not limited to this.
In one exemplary embodiment of the present invention, vacuum arc remelting method of the present invention also comprises and is welded on the dummy electrode in the vacuum arc fumace under vacuum condition high Nb superalloy electrode bar and the step of broken NULLCHECK welding quality.
In one exemplary embodiment of the present invention, vacuum arc remelting method of the present invention reduces the step that the melting electric current carries out the ingot head filling after also being included in normal reflow process gradually.Wherein, the above-mentioned step that reduces gradually the melting electric current specifically adopts step type to reduce gradually the 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 the position is to excise in follow-up hot procedure, the purpose of filling mainly is 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 (drip/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 by the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of above-mentioned inhibition and obtained.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 |
The below enumerates concrete example and comes exemplary embodiment of the present invention is further elaborated.Example only is used for explanation the present invention, and is not to limit by any way the present invention.Wherein related degree all is weight percentage unless otherwise noted.
Because the Nb content requirement in GH4169, GH2907 and the GH2909 alloy is respectively: 4.8～5.5%, 4.3～5.2% and 4.3～5.2%, all belong to and contain the higher superalloy of Nb, and the smelting technology route all can be 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, adopt again 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 the 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 the bottom, molten bath, steel ingot top pasty state layer thickness, and make the molten bath flattening, make solute have little time to distribute, and then alleviate or avoid occurring the defective of macrosegregation, GH4169, the composition of GH2907 and GH2909 alloy is as shown in table 1, and 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; when adding Nb and after adding Nb, adopt three-phase main-frequency to stir 25～30min in the smelting process; make working chamber's internal pressure reach 10000～14000Pa in the low Argon of cast forehearth; under argon shield atmosphere, the control tapping temperature is 1460～1480 ℃.Charged tapping, pushing off the slag are filtered, and finish the cast of φ 440mm electrode bar, prepare the fine and close more shallow φ 440mm electrode bar of shrinkage cavity, again with φ 440mm electrode bar through cutting cap mouth and surface finish, finish the preparation work of electrode bar.
2) welding of electrode bar and the vacuum arc remelting starting the arc:
At first, after vacuum degree of cold state reaches below the 1Pa, carry out the welding of φ 440mm electrode bar, it is welded on the dummy electrode of this steel; After welding is finished, 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, the 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 control 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, finishes 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, reduce gradually electric current with step type, every one-level electric current keeps 3～20min, and the filling time amounts to 30～90min, the filling stage of finishing 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:
After finishing filling, the cold 1h of stove broken vacates stove, and air cooling is finished the smelting of φ 508mm steel ingot, follow-up the vacuum arc remelting steel ingot is pulled out skin.
6) subsequent production of vacuum arc fumace steel ingot:
The vacuum arc remelting steel ingot is carried out 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 Fig. 4, shown in Figure 5 shown in, according to the mechanical property of GH2907 alloy, GH2909 alloy and the GH4196 alloy of this example gained such as table
4, shown in table 5, table 6 and the 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
According to Fig. 4 and Fig. 5, table 4 to table 8 as can be known, 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 defective, can satisfy the performance requriements of superalloy.
In sum, the metallurgical imperfection of macrosegregation appears in the superalloy that method of the present invention can suppress high Nb content effectively in the vacuum arc remelting process, 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 the above has described the present invention in conjunction with exemplary embodiment, those of ordinary skills should be clear, in the situation of the spirit and scope that do not break away from claim, can carry out various modifications to above-described embodiment.
Claims (8)
1. 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 vacuum arc remelting, in normal reflow process, control 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.
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 and is welded on the dummy electrode in the vacuum arc fumace high Nb superalloy electrode bar and the step of broken NULLCHECK welding quality under vacuum condition.
4. 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 reduces the step that the melting electric current carries out the ingot head filling after also being included in normal reflow process gradually.
5. the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of inhibition according to claim 4, it is characterized in that, the described step that reduces gradually the melting electric current specifically adopts step type to reduce gradually the 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 30～90 minutes.
6. the superalloy of a high Nb content is characterized in that, described superalloy is smelted by the vacuum arc remelting method of the superalloy macrosegregation of the high Nb content of each described inhibition in the claim 1 to 5 and obtained.
7. the superalloy of high Nb content according to claim 6 is characterized in that, by weight percentage, the Nb content in the described superalloy is 4.3～5.5%.
8. the superalloy of high Nb content according to claim 6 is characterized in that, by weight percentage, the Nb content in the described superalloy is 4.55～5.48%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498075A (en) * | 2013-09-03 | 2014-01-08 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of deformation-resistant high-temperature alloy and deformation-resistant high-temperature alloy part |
| CN105838897A (en) * | 2016-04-05 | 2016-08-10 | 重庆钢铁(集团)有限责任公司 | Remelting technique for eliminating pattern segregation of electroslag steel |
| TWI553128B (en) * | 2013-03-28 | 2016-10-11 | Hitachi Metals Ltd | The Method of Making Spinning Steel and the Method of Refining in Material |
| CN109457119A (en) * | 2018-11-26 | 2019-03-12 | 抚顺特殊钢股份有限公司 | A kind of simple method of controlling of titanium alloy vacuum consumable melting current voltage matches |
| CN110935985A (en) * | 2019-12-10 | 2020-03-31 | 攀钢集团成都钛材有限公司江油分公司 | Method for welding auxiliary electrode in VAR smelting furnace |
| CN111655871A (en) * | 2017-12-22 | 2020-09-11 | 山特维克知识产权股份有限公司 | Process for refining nitrogen-containing metal alloy |
| CN114045436A (en) * | 2021-11-12 | 2022-02-15 | 成都先进金属材料产业技术研究院股份有限公司 | GH2909 alloy ingot and preparation method thereof |
| CN114990344A (en) * | 2022-06-07 | 2022-09-02 | 大冶特殊钢有限公司 | Method for producing high-Al alloy by adopting vacuum consumable melting |
| CN116377314A (en) * | 2023-06-05 | 2023-07-04 | 成都先进金属材料产业技术研究院股份有限公司 | Martensitic heat-resistant steel for gas turbine and smelting method thereof |
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| TWI553128B (en) * | 2013-03-28 | 2016-10-11 | Hitachi Metals Ltd | The Method of Making Spinning Steel and the Method of Refining in Material |
| CN103498075A (en) * | 2013-09-03 | 2014-01-08 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of deformation-resistant high-temperature alloy and deformation-resistant high-temperature alloy part |
| CN105838897A (en) * | 2016-04-05 | 2016-08-10 | 重庆钢铁(集团)有限责任公司 | Remelting technique for eliminating pattern segregation of electroslag steel |
| CN111655871A (en) * | 2017-12-22 | 2020-09-11 | 山特维克知识产权股份有限公司 | Process for refining nitrogen-containing metal alloy |
| CN109457119A (en) * | 2018-11-26 | 2019-03-12 | 抚顺特殊钢股份有限公司 | A kind of simple method of controlling of titanium alloy vacuum consumable melting current voltage matches |
| CN110935985A (en) * | 2019-12-10 | 2020-03-31 | 攀钢集团成都钛材有限公司江油分公司 | Method for welding auxiliary electrode in VAR smelting furnace |
| CN114045436A (en) * | 2021-11-12 | 2022-02-15 | 成都先进金属材料产业技术研究院股份有限公司 | GH2909 alloy ingot and preparation method thereof |
| CN114990344A (en) * | 2022-06-07 | 2022-09-02 | 大冶特殊钢有限公司 | Method for producing high-Al alloy by adopting vacuum consumable melting |
| CN114990344B (en) * | 2022-06-07 | 2023-11-24 | 大冶特殊钢有限公司 | Method for producing high Al alloy by adopting vacuum consumable smelting |
| CN116377314A (en) * | 2023-06-05 | 2023-07-04 | 成都先进金属材料产业技术研究院股份有限公司 | Martensitic heat-resistant steel for gas turbine and smelting method thereof |
| CN116377314B (en) * | 2023-06-05 | 2023-10-27 | 成都先进金属材料产业技术研究院股份有限公司 | Martensitic heat-resistant steel for gas turbine and smelting method thereof |
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