CN116174629A - Low-cost preparation method of nickel-rich nickel-titanium alloy pipe and application of nickel-rich nickel-titanium alloy pipe to ball valve - Google Patents

Low-cost preparation method of nickel-rich nickel-titanium alloy pipe and application of nickel-rich nickel-titanium alloy pipe to ball valve Download PDF

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CN116174629A
CN116174629A CN202310116098.6A CN202310116098A CN116174629A CN 116174629 A CN116174629 A CN 116174629A CN 202310116098 A CN202310116098 A CN 202310116098A CN 116174629 A CN116174629 A CN 116174629A
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nickel
titanium alloy
alloy pipe
rich
ingot
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李磊
洪权
郭荻子
应扬
曹祖涵
杨海瑛
马宇
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Northwest Institute for Non Ferrous Metal Research
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Northwest Institute for Non Ferrous Metal Research
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/008—Incremental forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The invention discloses a low-cost preparation method of a nickel-rich nickel-titanium alloy pipe, which comprises the following steps: 1. vacuum induction smelting the raw materials and casting to obtain an ingot; 2. heat treating the cast ingot; 3. peeling and processing the cast ingot, machining a core hole to prepare a tube blank, spraying an anti-oxidation coating, standing and drying; 4. step heating, heating and preserving heat, and sleeving into a core rod for radial forging processing to obtain a nickel-rich nickel-titanium alloy pipe; the invention also discloses application of the nickel-rich nickel-titanium alloy pipe to a ball valve. According to the invention, the core hole is formed in the machine after the ingot is softened by heat treatment, so that the core defect of the ingot is removed, the problem of shrinkage hole in the center of the induction smelting alloy ingot is avoided, the material utilization rate is improved, the processing flow is shortened, and the material and processing cost are reduced; the ball and the valve seat for the ball valve, which are manufactured by processing the 60NiTi (X) alloy pipe, have the characteristics of corrosion resistance, wear resistance, high hardness and impact load resistance, and are suitable for the fields of petrochemical industry and the like.

Description

Low-cost preparation method of nickel-rich nickel-titanium alloy pipe and application of nickel-rich nickel-titanium alloy pipe to ball valve
Technical Field
The invention belongs to the technical field of preparation of difficult-to-deform metal pipes, and particularly relates to a low-cost preparation method of a nickel-rich nickel-titanium alloy pipe and application of the nickel-rich nickel-titanium alloy pipe to a ball valve.
Background
The national aviation and aerospace agency (NASA) found in the beginning of the century that Nitinol60 alloy (weight ratio of Ni to Ti 60:40) has very high hardness (56 HRC-62 HRC), very excellent friction and wear properties, and has the properties of low elastic modulus, super elasticity, corrosion resistance and the like. The standard published in the United states 2016 (MSFC-SPEC-3706) & lt SPECIFICATION FOR Ni-40Ti BILLETS & lt 60 & gt is named as 60Ni-40Ti, wherein the mass percentage range of Ti element in 60Ni-40Ti is defined as 39% -41%, 60NiTi is generally used in academic circles to represent the material, and a ternary alloy developed by adding a small amount of alloy element based on 60NiTi is named as 60NiTi-X (the X element is Hf, ta, zr, al, nb, mo, V, cr, W, co, cu and the like), wherein the alloy element content in 60NiTi-X is generally not more than 10%. The above 60NiTi and 60NiTi-X may be referred to as 60NiTi (X), collectively referred to as nickel-rich nickel-titanium alloys.
In view of the great application prospect of 60NiTi (X), 60NiTi (X) is becoming a hot spot for new material research. NASA prepared 60NiTi bearing balls by using a powder metallurgy method in 2010, filed a technical patent for powder metallurgy preparation of 60NiTi bearings in 2012, established technical standards for 60NiTi powder metallurgy ingots in 2016, and applied the powder metallurgy 60NiTi (X) bearings to a wastewater treatment system of an international space station in 2015.
In the chemical industry field, most materials can not meet the use requirement because the working condition of the ball valve has the characteristics of high temperature, high pressure, high abrasion and high corrosion. At present, titanium alloy ball valves are mostly adopted under complex working conditions in the chemical industry field, but due to low hardness of titanium alloy, friction and wear performance are poor, and surface hardening treatment is needed for the ball body of the ball valve. However, the hardened layer is severely worn in use, and the hardened layer needs to be overhauled or replaced every month, so that the production and maintenance costs are greatly increased. The 60NiTi (X) has the characteristics of high hardness, corrosion resistance, friction resistance, high temperature resistance and the like, and is very suitable for being applied to ball valve materials in the chemical industry field. However, to date, the material has not been applied on a large scale. On one hand, the material has intrinsic brittleness due to higher raw materials and processing cost, and on the other hand, the conventional hot forming is difficult. While the powder metallurgy technology adopted in the United states avoids the conventional forging thermoforming process, the powder metallurgy has the advantages of more working procedures, long construction period, high cost, easiness in oxidation pollution of powder, bonding defects in the material after hot isostatic pressing and the like, and influences the service life and marketing of the material. At present, a low-cost 60NiTi (X) processing method is urgently needed, so that the processing flow can be shortened, the cost can be further reduced, and the material is popularized to industries such as petrochemical industry and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-cost preparation method of a nickel-rich nickel-titanium alloy pipe. According to the method, the cast ingot prepared by vacuum induction melting is softened by heat treatment and then is provided with the core hole by a machine, so that the defect of the core part of the cast ingot is removed, the problem of shrinkage of the core hole of the cast ingot of the induction melting 60NiTi (X) alloy is avoided, the cast ingot is converted into a tube blank in one step, and the tube blank is processed into a tube through radial forging, so that the material utilization rate is improved, the processing flow is shortened, and the material and processing cost are reduced.
In order to solve the technical problems, the invention adopts the following technical scheme: the low-cost preparation method of the nickel-rich nickel-titanium alloy pipe is characterized by comprising the following steps of:
firstly, putting a nickel plate, sponge titanium and alloy element raw materials into a crucible of a vacuum induction smelting furnace, then carrying out vacuum induction smelting until the materials are completely melted, and casting to obtain an ingot;
step two, placing the cast ingot obtained in the step one into an electric furnace, preserving heat for more than 3 hours at 800-1000 ℃, and cooling the furnace to room temperature;
step three, peeling the ingot after furnace cooling in the step two, machining a core hole, manufacturing a tube blank, spraying an anti-oxidation coating on the inner surface and the outer surface of the tube blank, and standing and drying;
step four, heating the tube blank subjected to standing and drying in the step three to 850-900 ℃ in a stepped way, preserving heat for 1-3 h, taking out, sleeving a core rod, and carrying out 2-3 times of radial forging processing to prepare the nickel-rich nickel-titanium alloy tube.
At present, the ingot smelting of the nickel-rich nickel-titanium alloy 60NiTi (X) mainly adopts induction smelting and vacuum consumable electric furnace smelting or adopts a duplex smelting method of induction smelting and vacuum consumable electric furnace smelting. The cast ingot cast by induction melting has low cost and high efficiency, but a large amount of shrinkage cavities can be generated in the central axial direction of the cast ingot, as shown in figure 1; this is due to the formation of a large number of Ni3Ti, ni4Ti3 and Ni3Ti2 phases during ingot cooling, resulting in phase change induced volume shrinkage. And the cast ingot smelted by the vacuum consumable electric furnace has the problem that the consistency of the cast ingot components is difficult to ensure because a melting pool is shallow during smelting. Therefore, a duplex smelting method of induction smelting and vacuum consumable electric furnace smelting is often adopted. The duplex smelting technology can greatly reduce the internal defects of the cast ingot, but the hot working difficulty is increased along with the increase of the diameter of the cast ingot. Therefore, only small-size cast ingots subjected to duplex smelting can meet the requirements of traditional forging processing, about 20% of riser weight is removed, and the duplex smelting method has low material utilization rate and high smelting cost.
Aiming at the problem of shrinkage cavity defect in the center of a once cast ingot of the nickel-rich nickel-titanium alloy 60NiTi (X) by induction smelting, the cast ingot prepared by vacuum induction smelting is softened by heat treatment, a core hole is formed by a machine to remove the core defect of the cast ingot, and then a tube blank formed by the machine is heated and then is subjected to radial forging to prepare the nickel-rich nickel-titanium alloy tube. Firstly, the preparation method only adopts induction smelting, thereby effectively reducing smelting cost, improving the utilization rate of materials, shortening processing flow and further reducing processing cost. Secondly, the radial forging processing is a high-speed impact deformation method, in the radial forging processing (shown in fig. 2a and 2 b), four forging hammers are used for hammering the tube blank in a reciprocating manner at high speed, the tube blank is rapidly deformed by impact load, and the deformation amount is accurately controlled by adopting the deformation mode, so that a high-precision nickel-rich nickel-titanium alloy tube with more uniform outer diameter and wall thickness is obtained; in addition, the impact load deformation can be carried out in a lower temperature range, so that grains can be effectively refined, and the performance of the nickel-rich nickel-titanium alloy pipe can be ensured to meet the use requirements of parts.
The low-cost preparation method of the nickel-rich nickel-titanium alloy pipe is characterized in that in the first step, a nickel plate and a sponge titanium raw material are prepared according to the component composition of the target product nickel-rich nickel-titanium alloy pipe, and in addition, the nickel plate with the total mass of 0.5% -1% of the raw material is added. Because the cooling rate of the core part of the induction smelting ingot is slower in the solidification process, a Ni3Ti phase is easy to form, the 60NiTi (X) ingot is often required to be subjected to subsequent high-temperature homogenization treatment to improve the tissue uniformity, and the core defect is removed in a mode of machining a core hole later, so that component deviation is easy to cause, and the quality of a nickel plate is required to be additionally increased by 0.5-1% in the smelting and batching stage according to the diameter and the size of the ingot so as to compensate the component deviation.
The low-cost preparation method of the nickel-rich nickel-titanium alloy pipe is characterized in that the step heating process in the step four is as follows: sequentially and respectively preserving heat at 200 ℃ and 500 ℃ for 1h, and then rapidly heating to 850-900 ℃ at the speed of 10-20 ℃/min.
Nickel-rich nickel-titanium alloys, i.e., 60NiTi (X) alloys, are quite different from the common conventional nickel-titanium alloys. The traditional nickel-titanium alloy (the nickel content is 54.5% -57%) mainly comprises a NiTi parent phase, the cold and hot processing difficulty is low, and the nickel-titanium alloy can be prepared by using the traditional method and is applied on a large scale at present. However, the composition of the 60NiTi (X) alloy phase is very complex, including a NiTi parent phase, a Ni3Ti equilibrium phase, and a Ni4Ti3 and Ni3Ti2 metastable phase, and particularly when in a hardened state, the content of the Ni4Ti3 phase reaches more than 60%, and the alloy material as a whole has intrinsic brittleness due to high chemical bond strength and strong directivity of the alloy phases. Therefore, the smelting and hot forming methods of conventional nickel-titanium alloys (nickel content of 54.5% -57%) cannot be directly applied to 60NiTi (X) alloys.
A large number of theoretical calculations and experiments show that the decomposition of Ni4Ti3 phase is inhibited as much as possible in the heating process of the 60NiTi (X) alloy cast ingot, so that the stress concentration of the cast ingot caused by phase change can be weakened, and the machinability of the 60NiTi (X) alloy cast ingot is enhanced. Therefore, the pipe blank is subjected to step heating, firstly, 60NiTi (X) is extremely easy to react with water in a high-temperature stage, so that the pipe blank is firstly kept at 200 ℃ for 1h to remove residual moisture in the anti-oxidation coating sprayed on the surface of the pipe blank; secondly, the experiment finds that the temperature of 500 ℃ is the temperature at which the Ni4Ti3 phase starts to slowly decompose, so that the tube blank is kept at the temperature of 500 ℃ for 1h, the temperature of the heated tube blank is uniform, and the Ni4Ti3 phase is hardly decomposed; then rapidly heating to the forging temperature of 850-900 ℃, under the temperature condition, the Ni4Ti3 phase is basically decomposed into a NiTi parent phase and a part of nickel atoms dissolved in the parent phase, the change of the phase change volume is small, the internal stress of the tube blank is small, the intrinsic brittleness of the material is eliminated, and the smooth proceeding of the radial forging processing process is ensured.
The low-cost preparation method of the nickel-rich nickel-titanium alloy pipe is characterized in that the reduction of the pass wall thickness of the radial forging processing in the fourth step is 3-5 mm, and the strain rate is 1s -1 ～10s -1 Tempering is carried out for 10-20 min after each pass of processing, and the core rod is replaced and then the next pass of processing is carried out.
The invention uses the strain rate of 60NiTi (X) cast sample, namely tube blank, to be 1s respectively -1 And 10s -1 Under the condition, thermal simulation experiments (the results are shown in fig. 3a and 3 b) of different temperatures are carried out, and rheological resistance data and plastic deformation capacity data of the material subjected to high-speed large-deformation processing at different temperatures are mastered. And then in the tube blank diameter forging process, determining the reduction of the pass wall thickness of the tube blank diameter forging process according to the sizes of the cast ingot and the core hole, and controlling the reduction of the pass wall thickness to be 3-5 mm, so that the situation that the core rod is deformed and is difficult to separate from the tube due to overlarge pass deformation can be avoided. Meanwhile, after each pass of radial forging processing is finished, tempering and heat preservation are carried out, and finer core rods are replaced, so that the smooth proceeding of subsequent pass processing is ensured.
In addition, the invention also discloses application of the nickel-rich nickel-titanium alloy pipe prepared by the method to a ball valve, which is characterized in that the nickel-rich nickel-titanium alloy pipe is subjected to cutting, rough machining, hardening treatment and precise machining to prepare a ball body and a valve seat for the ball valve. The nickel-rich nickel-titanium 60NiTi (X) alloy pipe prepared by the method is processed into spheres and valve seats, so that the material utilization rate is effectively improved, the material processing steps are reduced, and the product cost is greatly reduced.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the core hole is formed in the machine after the ingot prepared by vacuum induction smelting is softened by heat treatment, so that the core defect of the ingot is removed, the problem of shrinkage cavity in the center of the ingot of the induction smelting 60NiTi (X) alloy is avoided, the ingot is converted into a tube blank by one step, the material utilization rate is improved, and the material cost is reduced.
2. The invention directly completes the processing from tube blank to tube by adopting the radial forging processing, shortens the processing flow of the nickel-rich nickel-titanium alloy 60NiTi (X) alloy tube and reduces the processing cost.
3. The ball and the valve seat for the ball valve, which are manufactured by processing the nickel-rich nickel-titanium alloy 60NiTi (X) pipe, have the characteristics of corrosion resistance, wear resistance, high hardness and impact load resistance, have long service life, reduce the maintenance cost of the ball valve, and have wide application prospects in the fields of petrochemical industry and the like.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a diagram showing the anatomy of a nickel-rich nickel-titanium alloy ingot produced by a prior duplex smelting method.
Fig. 2a is a schematic diagram showing the positional relationship between the forging hammer and the tube blank in the radial forging process.
Fig. 2b is a schematic diagram showing the deformation process of the tube blank in the radial forging process.
FIG. 3a shows the tube blank of the present invention at a strain rate of 1s -1 And tissue stress strain maps under different temperature conditions.
FIG. 3b shows the tube blank of the present invention at a strain rate of 10s -1 Under different temperature conditionsTissue stress strain diagram.
Fig. 4 is a physical diagram of a ball for a nickel-rich nickel-titanium alloy ball valve prepared in example 2 of the present invention.
Detailed Description
Example 1
The preparation method of the nickel-rich nickel-titanium alloy pipe comprises the following steps:
firstly, preparing 24kg of nickel plates and 16kg of sponge titanium raw materials according to the component composition of a target product 60NiTi alloy pipe, putting the nickel plates and the 16kg of sponge titanium raw materials into a crucible of a vacuum induction melting furnace, adding 0.4kg of nickel plates serving as supplementary materials into the crucible, performing vacuum induction melting until the nickel plates are completely melted, and casting to obtain an ingot with the diameter multiplied by the height phi 110mm multiplied by 650 mm;
step two, placing the cast ingot obtained in the step one into an electric furnace, preserving heat for 4 hours at 800 ℃, and cooling the furnace to room temperature;
step three, peeling the ingot after furnace cooling in the step two, machining a core hole, manufacturing a tube blank with the specification of external diameter multiplied by internal diameter multiplied by length of 100mm multiplied by 42mm multiplied by 650mm, spraying an anti-oxidation coating on the inner surface and the outer surface of the tube blank, and standing and drying;
step four, heating the tube blank subjected to standing and drying in the step three to 200 ℃ for heat preservation for 1h, continuously heating to 500 ℃ for heat preservation for 1h, then rapidly heating to 900 ℃ at the speed of 10 ℃/min for heat preservation for 1h, taking out, sleeving a mandrel with the diameter phi of 40mm, carrying out 1-pass radial forging, wherein the wall thickness reduction of the 1-pass is 5mm, and the strain rate is 1s -1 Obtaining a pipe with the specification of external diameter multiplied by internal diameter multiplied by length multiplied by 88mm multiplied by 40mm multiplied by 870mm, taking out from the furnace after tempering for 20min, sleeving a mandrel with the diameter phi of 38mm, carrying out 2-pass radial forging processing, wherein the wall thickness reduction of the 2-pass is 4mm, and the strain rate is 1s -1 Obtaining a pipe with the specification of external diameter multiplied by internal diameter multiplied by length of 78mm multiplied by 38mm multiplied by 1153mm, taking out of the furnace after tempering for 15min, sleeving a core rod with the diameter phi of 36mm, carrying out 3-pass radial forging, wherein the wall thickness reduction of the 3-pass is 3mm, and the strain rate is 1s -1 A pipe having a standard outer diameter X inner diameter X length of 70mm X36 mm X1485 mm, namely a 60NiTi alloy pipe, was obtained.
The nickel-rich nickel-titanium alloy pipe of the embodiment is applied as follows: cutting a 60NiTi alloy pipe to a length of 60mm, roughly processing the 60NiTi alloy pipe into spheres, hardening the spheres by induction heating, and precisely processing the spheres into 60NiTi alloy spheres with an outer diameter of 66mm and an inner hole of 40 mm; cutting a 60NiTi alloy pipe to a length of 10mm, roughly machining the pipe into a valve seat, hardening the valve seat by adopting resistance heating, and precisely machining the valve seat into the 60NiTi alloy valve seat with an outer diameter of 66mm, an inner hole of 40mm and a height of 8 mm.
The 60NiTi alloy sphere and the 60NiTi alloy valve seat prepared in the embodiment can be combined or independently applied to the ball valve.
Through detection, the 60NiTi alloy spheres and the 60NiTi alloy valve seats prepared by the embodiment have high hardness, good wear resistance and excellent corrosion resistance, can be used at 400 ℃ for a long time, and are suitable for the fields of petrochemical industry and the like.
Example 2
The preparation method of the nickel-rich nickel-titanium alloy pipe comprises the following steps:
step one, according to the composition Ni of the target product 60NiTi-Hf alloy pipe 54 Ti 38 Hf 8 Preparing 10.8kg of nickel plates, 7.6kg of titanium sponge and 1.6kg of hafnium raw materials, putting the nickel plates into a crucible of a vacuum induction melting furnace, adding 0.1kg of nickel plates as supplementary materials, putting the nickel plates into the crucible, performing vacuum induction melting until the nickel plates are completely melted, and casting to obtain cast ingots with diameters multiplied by heights phi 80mm multiplied by 600 mm;
step two, placing the cast ingot obtained in the step one into an electric furnace, preserving heat for 3 hours at 1000 ℃, and cooling the furnace to room temperature;
step three, peeling the ingot after furnace cooling in the step two, machining a core hole, manufacturing a tube blank with the specification of external diameter multiplied by internal diameter multiplied by length of 70mm multiplied by 32mm multiplied by 600mm, spraying an anti-oxidation coating on the inner surface and the outer surface of the tube blank, and standing and drying;
step four, heating the tube blank subjected to standing and drying in the step three to 200 ℃ for heat preservation for 1h, continuously heating to 500 ℃ for heat preservation for 1h, then rapidly heating to 850 ℃ at the speed of 20 ℃/min and preserving heat for 3h, discharging, sleeving a core rod with the diameter phi of 30mm, carrying out 1-pass radial forging, wherein the wall thickness reduction of the 1-pass is 3mm, and the strain rate is 10s -1 Obtaining a pipe with the specification of external diameter multiplied by internal diameter multiplied by length multiplied by 64mm multiplied by 30mm multiplied by 727mm, taking out of the furnace after tempering for 10min, sleeving a mandrel with the diameter phi of 28mm, carrying out 2-pass radial forging, wherein the reduction of the wall thickness of the 2-pass is 3mm, and the strain rate is 10s -1 The pipe with the specification of external diameter multiplied by internal diameter multiplied by length of 56mm multiplied by 28mm multiplied by 1420mm is obtained, namely the 60NiTi-Hf alloy pipe.
The nickel-rich nickel-titanium alloy pipe of the embodiment is applied as follows: cutting a 60NiTi-Hf alloy pipe to 50mm in length, roughly machining the pipe into a sphere, hardening the sphere by induction heating, and precisely machining the sphere into a 60NiTi-Hf alloy sphere with the outer diameter of 53mm and the inner hole of 32mm, as shown in FIG. 4; cutting a 60NiTi-Hf alloy pipe to a length of 10mm, roughly machining the pipe into a valve seat, hardening the valve seat by adopting resistance heating, and precisely machining the valve seat into the 60NiTi-Hf alloy valve seat with an outer diameter of 44mm, an inner hole of 32mm and a height of 6 mm.
The 60NiTi-Hf alloy sphere and the 60NiTi-Hf alloy valve seat prepared in the embodiment can be combined or independently applied to a ball valve.
Through detection, the 60NiTi-Hf alloy ball and the 60NiTi-Hf alloy valve seat prepared by the embodiment have high hardness, good wear resistance and excellent corrosion resistance, can be used at 400 ℃ for a long time, and are suitable for the fields of petrochemical industry and the like.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.

Claims (5)

1. The low-cost preparation method of the nickel-rich nickel-titanium alloy pipe is characterized by comprising the following steps of:
firstly, putting a nickel plate, sponge titanium and alloy element raw materials into a crucible of a vacuum induction smelting furnace, then carrying out vacuum induction smelting until the materials are completely melted, and casting to obtain an ingot;
step two, placing the cast ingot obtained in the step one into an electric furnace, preserving heat for more than 3 hours at 800-1000 ℃, and cooling the furnace to room temperature;
step three, peeling the ingot after furnace cooling in the step two, machining a core hole, manufacturing a tube blank, spraying an anti-oxidation coating on the inner surface and the outer surface of the tube blank, and standing and drying;
step four, heating the tube blank subjected to standing and drying in the step three to 850-900 ℃ in a stepped way, preserving heat for 1-3 h, taking out, sleeving a core rod, and carrying out 2-3 times of radial forging processing to prepare the nickel-rich nickel-titanium alloy tube.
2. The low-cost preparation method of the nickel-rich nickel-titanium alloy pipe according to claim 1, wherein in the first step, a nickel plate and a sponge titanium raw material are prepared according to the component composition of the target product nickel-rich nickel-titanium alloy pipe, and the total mass of the raw material is additionally increased by 0.5% -1%.
3. The low-cost preparation method of the nickel-rich nickel-titanium alloy pipe according to claim 1, wherein the step heating process in the fourth step is as follows: sequentially and respectively preserving heat at 200 ℃ and 500 ℃ for 1h, and then rapidly heating to 850-900 ℃ at the speed of 10-20 ℃/min.
4. The low-cost preparation method of nickel-rich nickel-titanium alloy pipe according to claim 1, wherein the reduction of the pass wall thickness of the radial forging process in the fourth step is 3-5 mm, and the strain rate is 1s -1 ～10s -1 Tempering is carried out for 10-20 min after each pass of processing, and the core rod is replaced and then the next pass of processing is carried out.
5. Use of the nickel-rich nickel-titanium alloy pipe prepared by the method according to any one of claims 1-4 in ball valves, wherein the nickel-rich nickel-titanium alloy pipe is subjected to cutting, rough machining, hardening treatment and precise machining to prepare a ball and a valve seat for the ball valves.
CN202310116098.6A 2023-02-15 2023-02-15 Low-cost preparation method of nickel-rich nickel-titanium alloy pipe and application of nickel-rich nickel-titanium alloy pipe to ball valve Pending CN116174629A (en)

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