CN113337755A - Double-vacuum melting method of GH4350 alloy for high-temperature fasteners - Google Patents
Double-vacuum melting method of GH4350 alloy for high-temperature fasteners Download PDFInfo
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- CN113337755A CN113337755A CN202110615349.6A CN202110615349A CN113337755A CN 113337755 A CN113337755 A CN 113337755A CN 202110615349 A CN202110615349 A CN 202110615349A CN 113337755 A CN113337755 A CN 113337755A
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- C—CHEMISTRY; METALLURGY
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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Abstract
The invention discloses a GH4350 alloy for a high-temperature fastener, which comprises the following components in part by weight: the invention also discloses a double vacuum melting method of GH4350 alloy for high temperature fasteners, which comprises the following steps: quantitative weighing, melting period, refining period, alloying and pouring; the double vacuum melting method of the GH4350 alloy for the high-temperature fastener firstly invents a consumable remelting phi 305mm steel ingot by adopting a phi 250 electrode, solves the problem of the GH4350 alloy melting process with ultralow gas content, reduces other O to below 10ppm, reduces N to below 20ppm, and controls the content of harmful gas N to below 20 ppm.
Description
Technical Field
The invention relates to the technical field of high-temperature fastener alloy preparation, in particular to a double-vacuum melting method of GH4350 alloy for high-temperature fasteners.
Background
AEREX350 (national GH350) alloy is a novel high-temperature high-strength multiphase fastener alloy with the maximum use temperature of 159 ℃ developed by American SPS company through component optimization on the basis of MP159 alloy aiming at the requirement that advanced aeroengines use high-strength and high-creep-resistance fastener alloys at the temperature of more than 700 ℃. The alloy not only maintains the high corrosion resistance and excellent plasticity and toughness of the MP159 alloy, but also greatly improves the endurance strength and creep resistance, and is the high-strength fastener alloy with the highest use temperature at present. Because of the excellent comprehensive performance, the high-strength fastening piece can be used as a high-strength fastening piece in service at 650-750 ℃, and is also an ideal material for turbine blades, turbine disks, and landing gears of airplanes and aircrafts.
In the prior art, a phi 130mm electrode is adopted to smelt a phi 180mm consumable ingot, the vacuum degree is not controlled in the charging and melting period, the consumable ingot can be smelted within 100Pa, the content of oxygen and nitrogen in gas O and N after full melting is high, so that oxygen and nitrogen elements are difficult to remove in the later period, O is generally more than 20ppm, and N is generally more than 70 ppm; the consumable melting rate is controlled according to 1.2kg/min, the over-low melting rate causes the over-high burning loss of each element in the vacuum induction, and the burning loss rule of each element is unstable; in addition, the smelting is carried out in a laboratory, a 200kg vacuum induction furnace is adopted for smelting, 1000kg smelting is adopted in the production process, the control range of elements which are easy to fluctuate such as C, Ta, Nb, N and the like is narrow, and the fluctuation is not easy to control; the content of impurity elements such as O, N and the like of the alloy is required to be less than or equal to 10 x 10-6ppm, N is less than or equal to 20 x 10-6ppm, and the original consumable process can not meet the smelting requirement; the feeding sequence is not controlled, so that the later N element can not meet the standard requirement.
Disclosure of Invention
The invention aims to provide a double vacuum melting method of GH4350 alloy for high-temperature fasteners, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the GH4350 alloy for the high-temperature fastener comprises the following components: less than or equal to 0.025 percent of C, 14.50 to 18.00 percent of Cr, 23.0 to 27.0 percent of Co, 2.0 to 3.5 percent of Mo, 0.60 to 1.25 percent of Al, 1.65 to 2.35 percent of Ti, 3.5 to 4.6 percent of Ta, 0.65 to 1.35 percent of Nb, 1.50 to 2.80 percent of W and the balance of Ni.
Preferably, the alloy comprises 0.025% of C, 18.00% of Cr, 27.0% of Co, 3.5% of Mo, 1.25% of Al, 2.35% of Ti, 4.6% of Ta, 1.35% of Nb, 2.80% of W and the balance of Ni.
Preferably, the alloy comprises 0.015% of C, 14.50% of Cr, 23.0% of Co, 2.0% of Mo, 0.60% of Al, 1.65% of Ti, 3.5% of Ta, 0.65% of Nb, 1.50% of W and the balance of Ni.
Preferably, the alloy comprises 0.018% of C, 15.50% of Cr, 24.0% of Co, 2.5% of Mo, 0.90% of Al, 1.90% of Ti, 3.8% of Ta, 0.95% of Nb, 1.90% of W and the balance of Ni.
Preferably, the alloy comprises 0.022% of C, 16.00% of Cr, 26.0% of Co, 3.2% of Mo, 1.15% of Al, 2.00% of Ti, 4.2% of Ta, 1.05% of Nb, 2.60% of W and the balance of Ni.
A double vacuum melting method of GH4350 alloy for high temperature fasteners as described above, the preparation method comprising the steps of:
s1: quantitative weighing, namely weighing all the raw materials according to the components;
s2: and in the melting period, the materials are sequentially added, wherein 80 percent of niobium element and 80 percent of tantalum element are added in the interval, the melting temperature is as follows: 1490 ℃ and 1510 ℃, and the vacuum degree is less than or equal to 2 pa;
s3: and (3) refining period: and in the refining period, the molten steel is stirred and degassed through higher refining temperature and vacuum degree, wherein the refining temperature is as follows: 1500-1520 ℃ and the vacuum degree is less than or equal to 1 pa;
s4: alloying: after the molten steel is refined, sampling according to standard chemical composition requirements, and analyzing chemical composition results to ensure that the result of each chemical element is within the standard requirement range;
s5: pouring: when the chemical components meet the technical standard requirements, the molten steel is poured through a launder, and the pouring temperature meets 1470-.
The utility model provides a GH4350 alloy sampler for high temperature fastener, includes the sampler barrel, the feed liquor hole has been seted up on the surface of sampler barrel, the top surface of sampler barrel is provided with spacing knot, the inside grafting of spacing knot has the peg, the top of peg is fixed on the torsional spring, the torsional spring cover is established in the outside of spacing axle, spacing axle is fixed between two curb plates of link, the top surface of link is provided with rings, the inside of sampler barrel is provided with the backing plate, the bottom surface of sampler barrel is pegged graft and is had the handle that pushes away, it fixes on the bottom plate of cover seat to push away the handle, the cover seat cover is established in the bottom of sampler barrel, the finger groove has been seted up to the outer wall of cover seat.
Compared with the prior art, the invention has the beneficial effects that:
1. the double vacuum melting method of the GH4350 alloy for the high-temperature fastener firstly invents a consumable remelting phi 305mm steel ingot by adopting a phi 250 electrode, solves the problem of the GH4350 alloy melting process with ultralow gas content, reduces other O to below 10ppm, reduces N to below 20ppm, and controls the content of harmful gas N to below 20 ppm.
2. After molten steel contained in the GH4350 alloy sampler for the high-temperature fastener is solidified, the formed steel block is pushed out by driving the push handle through screwing the sleeve seat, and the sampling cylinder is matched with the hanging rod through the limit buckle for hoisting and sampling, so that the operation is simple and convenient.
Drawings
FIG. 1 is a schematic view of a sampling tube according to the present invention;
fig. 2 is an enlarged schematic view of a structure in fig. 1.
In the figure: the sampling tube comprises a sampling tube 1, a liquid inlet hole 2, a limiting buckle 3, a hanging rod 4, a torsion spring 5, a limiting shaft 6, a connecting frame 7, a hanging ring 8, a backing plate 9, a push handle 10, a sleeve seat 11 and a finger clamping groove 12.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides a technical scheme that: the GH4350 alloy for the high-temperature fastener comprises the following components: 0.025 percent of C, 18.00 percent of CrCo, 27.0 percent of Co, 3.5 percent of Mo, 1.25 percent of Al, 2.35 percent of Ti, 4.6 percent of Ta, 1.35 percent of Nb, 2.80 percent of W and the balance of Ni.
A double vacuum melting method of GH4350 alloy for high temperature fasteners as described above, the preparation method comprising the steps of:
s1: quantitative weighing, namely weighing all the raw materials according to the components;
s2: and in the melting period, the materials are sequentially added, wherein 80 percent of niobium element and 80 percent of tantalum element are added in the interval, the melting temperature is as follows: 1490 ℃ and 1510 ℃, and the vacuum degree is less than or equal to 2 pa;
s3: and (3) refining period: and in the refining period, the molten steel is stirred and degassed through higher refining temperature and vacuum degree, wherein the refining temperature is as follows: 1500 ℃ and the vacuum degree is less than or equal to 1 pa;
s4: alloying: after the molten steel is refined, sampling according to standard chemical composition requirements, and analyzing chemical composition results to ensure that the result of each chemical element is within the standard requirement range;
s5: pouring: and when the chemical components meet the technical standard requirements, the molten steel is poured through a launder, and the pouring temperature meets 1470 ℃.
Example two
The invention provides a technical scheme that: the GH4350 alloy for the high-temperature fastener comprises the following components: 0.015% of C, 14.50% of Cr14.0% of Co, 23.0% of Mo, 0.60% of Al, 1.65% of Ti, 3.5% of Ta, 0.65% of Nb, 1.50% of W and the balance of Ni.
A double vacuum melting method of GH4350 alloy for high temperature fasteners as described above, the preparation method comprising the steps of:
s1: quantitative weighing, namely weighing all the raw materials according to the components;
s2: and in the melting period, the materials are sequentially added, wherein 80 percent of niobium element and 80 percent of tantalum element are added in the interval, the melting temperature is as follows: 1490 ℃ and 1510 ℃, and the vacuum degree is less than or equal to 2 pa;
s3: and (3) refining period: and in the refining period, the molten steel is stirred and degassed through higher refining temperature and vacuum degree, wherein the refining temperature is as follows: 1520 ℃, vacuum degree is less than or equal to 1 pa;
s4: alloying: after the molten steel is refined, sampling according to standard chemical composition requirements, and analyzing chemical composition results to ensure that the result of each chemical element is within the standard requirement range;
s5: pouring: and when the chemical components meet the technical standard requirements, the molten steel is poured through a launder, and the pouring temperature meets 1490 ℃.
EXAMPLE III
The invention provides a technical scheme that: the GH4350 alloy for the high-temperature fastener comprises the following components: 0.018% of C, 15.50% of Cr15, 24.0% of Co, 2.5% of Mo, 0.90% of Al, 1.90% of Ti, 3.8% of Ta, 0.95% of Nb, 1.90% of W and the balance of Ni.
A double vacuum melting method of GH4350 alloy for high temperature fasteners as described above, the preparation method comprising the steps of:
s1: quantitative weighing, namely weighing all the raw materials according to the components;
s2: and in the melting period, the materials are sequentially added, wherein 80 percent of niobium element and 80 percent of tantalum element are added in the interval, the melting temperature is as follows: 1495 ℃, vacuum degree is less than or equal to 2 pa;
s3: and (3) refining period: and in the refining period, the molten steel is stirred and degassed through higher refining temperature and vacuum degree, wherein the refining temperature is as follows: 1505 ℃, vacuum degree is less than or equal to 1 pa;
s4: alloying: after the molten steel is refined, sampling according to standard chemical composition requirements, and analyzing chemical composition results to ensure that the result of each chemical element is within the standard requirement range;
s5: pouring: and when the chemical components meet the technical standard requirements, the molten steel is poured through a launder, and the pouring temperature meets 1475 ℃.
Example four
The invention provides a technical scheme that: the GH4350 alloy for the high-temperature fastener comprises the following components: 0.022% of C, 16.00% of CrCo, 26.0% of Co, 3.2% of Mo, 1.15% of Al, 2.00% of Ti, 4.2% of Ta, 1.05% of Nb, 2.60% of W and the balance of Ni.
A double vacuum melting method of GH4350 alloy for high temperature fasteners as described above, the preparation method comprising the steps of:
s1: quantitative weighing, namely weighing all the raw materials according to the components;
s2: and in the melting period, the materials are sequentially added, wherein 80 percent of niobium element and 80 percent of tantalum element are added in the interval, the melting temperature is as follows: 1505 ℃, vacuum degree is less than or equal to 2 pa;
s3: and (3) refining period: and in the refining period, the molten steel is stirred and degassed through higher refining temperature and vacuum degree, wherein the refining temperature is as follows: 1515 deg.C, vacuum degree is less than or equal to 1 pa;
s4: alloying: after the molten steel is refined, sampling according to standard chemical composition requirements, and analyzing chemical composition results to ensure that the result of each chemical element is within the standard requirement range;
s5: pouring: when the chemical components meet the technical standard requirements, the molten steel is poured through a launder, and the pouring temperature meets 1485 ℃.
When the GH4350 alloy sampler for the high-temperature fastener is actually used, the bottom end of a hanging rod 4 is inserted into a limit buckle 3, the limiting buckle 3 is a frame structure with an L-shaped section, the hanging rod 4 is an L-shaped plate structure, then the lifting rope is bolted on the lifting ring 8, the sampling cylinder 1 is put downwards to ensure that the molten steel is immersed in the liquid inlet hole 2, thus, the molten steel enters the sampling cylinder 1 through the liquid inlet hole 2, after the sampling cylinder 1 is fished out, the molten steel in the sampling cylinder 1 is formed, the finger is clamped in the finger clamping groove 12 and moves upwards through the screwing sleeve seat 11, therefore, the sleeve seat 11 drives the push handle 10 to push the backing plate 9, the backing plate 9 pushes the formed steel block out of the sampling cylinder 1, the formed steel block is convenient to take out, the clamping finger grooves 12 are of a square column structure, the clamping finger grooves 12 are arranged in a plurality, the clamping finger grooves 12 are arranged along the outer ring surface of the sleeve seat 11 at equal intervals, and the steel balls are embedded in the top surface of the push handle 10.
Claims (7)
1. A GH4350 alloy for high temperature fasteners, characterized by; the formula of the GH4350 alloy for the high-temperature fastener comprises the following components: less than or equal to 0.025 percent of C, 14.50 to 18.00 percent of Cr, 23.0 to 27.0 percent of Co, 2.0 to 3.5 percent of Mo, 0.60 to 1.25 percent of Al, 1.65 to 2.35 percent of Ti, 3.5 to 4.6 percent of Ta, 0.65 to 1.35 percent of Nb, 1.50 to 2.80 percent of W and the balance of Ni.
2. The GH4350 alloy for high temperature fasteners of claim 1, wherein: comprises C0.025%, Cr 18.00%, Co 27.0%, Mo 3.5%, Al 1.25%, Ti 2.35%, Ta 4.6%, Nb 1.35%, W2.80%, and the balance of Ni.
3. The GH4350 alloy for high temperature fasteners of claim 1, wherein: comprises 0.015 percent of C, 14.50 percent of Cr, 23.0 percent of Co, 2.0 percent of Mo, 0.60 percent of Al, 1.65 percent of Ti, 3.5 percent of Ta, 0.65 percent of Nb, 1.50 percent of W and the balance of Ni.
4. The GH4350 alloy for high temperature fasteners of claim 1, wherein: comprises 0.018% of C, 15.50% of Cr, 24.0% of Co, 2.5% of Mo, 0.90% of Al, 1.90% of Ti, 3.8% of Ta, 0.95% of Nb, 1.90% of W and the balance of Ni.
5. The GH4350 alloy for high temperature fasteners of claim 1, wherein: comprises 0.022% of C, 16.00% of Cr, 26.0% of Co, 3.2% of Mo, 1.15% of Al, 2.00% of Ti, 4.2% of Ta, 1.05% of Nb, 2.60% of W and the balance of Ni.
6. A double vacuum melting method of GH4350 alloy for high temperature fasteners according to any of claims 1 to 5, characterized by: the preparation method comprises the following steps:
s1: quantitative weighing, namely weighing all the raw materials according to the components;
s2: and in the melting period, the materials are sequentially added, wherein 80 percent of niobium element and 80 percent of tantalum element are added in the interval, the melting temperature is as follows: 1490 ℃ and 1510 ℃, and the vacuum degree is less than or equal to 2 pa;
s3: and (3) refining period: and in the refining period, the molten steel is stirred and degassed through higher refining temperature and vacuum degree, wherein the refining temperature is as follows: 1500-1520 ℃ and the vacuum degree is less than or equal to 1 pa;
s4: alloying: after the molten steel is refined, sampling according to standard chemical composition requirements, and analyzing chemical composition results to ensure that the result of each chemical element is within the standard requirement range;
s5: pouring: when the chemical components meet the technical standard requirements, the molten steel is poured through a launder, and the pouring temperature meets 1470-.
7. A GH4350 alloy sampler for high temperature fasteners, according to claim 6, comprising a sampling tube (1), characterized in that: the liquid inlet hole (2) has been seted up on the surface of sampler barrel (1), the top surface of sampler barrel (1) is provided with spacing knot (3), peg graft in the inside of spacing knot (3) has peg (4), the top of peg (4) is fixed on torsional spring (5), the outside at spacing axle (6) is established in torsional spring (5), spacing axle (6) are fixed between two curb plates of link (7), the top surface of link (7) is provided with rings (8), the inside of sampler barrel (1) is provided with backing plate (9), peg graft in the bottom surface of sampler barrel (1) has push handle (10), push handle (10) are fixed on the bottom plate of cover seat (11), cover seat (11) cover is established in the bottom of sampler barrel (1), finger groove (12) has been seted up to the outer wall of cover seat (11).
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