CN118385595A - Method for preparing T15 high-speed steel powder by EIGA gas atomization process - Google Patents
Method for preparing T15 high-speed steel powder by EIGA gas atomization process Download PDFInfo
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- 229910000997 High-speed steel Inorganic materials 0.000 title claims abstract description 126
- 239000000843 powder Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000009689 gas atomisation Methods 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000000889 atomisation Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000012387 aerosolization Methods 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 238000004663 powder metallurgy Methods 0.000 abstract description 2
- 239000002893 slag Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
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Abstract
The invention belongs to the technical field of powder metallurgy, and relates to a method for preparing T15 high-speed steel powder by an EIGA gas atomization process, wherein parameters such as rotation and feeding speed of bars, power supply of a heating coil, gas flow and the like are adjusted to control the particle size of the T15 high-speed steel powder, the powder yield of fine powder and the like; by adopting the proper proportion of the inner diameter of the coil and the diameter of the bar, the conductive ignition phenomenon between the bar and the coil can be prevented, the smelting power is increased, the yield of fine powder is improved, and the proportion of slag is greatly reduced; and because the crucible is not used and the whole process is in inert gas or high vacuum atmosphere, the prepared powder has the advantages of higher purity, less introduced impurities, less pollution and the like, and the T15 high-speed steel powder prepared by adopting the EIGA gas atomization process has the advantages of lower powder oxygen content, higher fine powder yield, lower cost and the like, thereby opening up a new path for producing the T-series high-speed steel powder with good quality.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, relates to preparation of T15 high-speed steel powder, and particularly relates to a method for preparing T15 high-speed steel powder by an EIGA (Electrode Induction-MELTING INERT GAS atom Atomization) gas Atomization process without crucible electrode induction melting.
Background
T15 powder high-speed steel in the special steel is used as a high-wear-resistant material with high hardness, high strength and high toughness and is commonly used as a cutting tool such as a broach, a milling cutter and the like in the mechanical and metallurgical industries. One of the key keys for industrially preparing the high-speed steel with the T15 powder on a large scale is to prepare the T15 powder with low cost and good quality.
There are few reports on the industrial production of T15 Powder, and it has been found from only a few documents (e.g., powder technology 2019; 352: 331-339) that T15 Powder is produced by the VIGA (Vacuum Induction-MELTING GAS Atomization, vacuum Induction melting Atomization with crucible) gas Atomization method. However, the process adopts a crucible to lead the prepared T15 powder to introduce a small amount of impurities, and compared with a plasma rotary electrode atomization process, the powder produced by the VIGA method contains a large amount of satellite powder, special-shaped powder and the like, and the factors are unfavorable for the subsequent preparation of high-speed steel products with high-performance T15 powder.
In addition, although the powder prepared by the plasma rotary electrode atomization process has the advantages of high sphericity, no satellite powder and the like. However, in the case of the T15 high-speed steel, if the T15 powder is prepared by using the plasma rotary electrode atomization process, the prepared T15 powder has high quality, but it is difficult to simultaneously melt into droplets and thus simultaneously atomize due to the large amount of different types of carbides contained in T15. Therefore, the T15 powder prepared by the powder preparation process is easy to generate a plurality of macroscopic residues, the powder yield is reduced, the production cost is increased, and the fine powder yield is lower.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for preparing T15 high-speed steel powder by an EIGA gas atomization process, wherein the T15 high-speed steel bar is taken as a raw material, the T15 high-speed steel is melted by heating an electrode induction coil of an EIGA device, and gas atomization is carried out under a certain process, so that the T15 high-speed steel powder with high purity and high fine powder yield is prepared.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process comprises the following steps of:
step1, selecting a pretreated T15 high-speed steel bar as a raw material;
step 2, melting the T15 high-speed steel bar in EIGA equipment, and then performing high-purity inert gas atomization to obtain T15 high-speed steel powder; wherein, the technological parameters of the gas atomization are as follows: the rotation speed of the T15 high-speed steel bar is 5 r/min-15 r/min, the feeding speed is 15 mm/min-25 mm/min, the power of a heating coil is 70 kW-110 kW, the smelting power is 35 kW-60 kW, the vacuum degree is-1 Pa-5 Pa, the gas flow is 750Nm 3/h~900Nm3/h, and the atomization pressure is 2.5 MPa-5 MPa;
And 3, storing the T15 high-speed steel powder obtained by the gas atomization in the step 2 in a vacuum charging bucket through a separator along an EIGA equipment pipeline, and vacuum screening after cooling to obtain the target T15 high-speed steel powder.
Further, the pretreatment in step 1 specifically includes:
The first connecting part is processed at the head of each T15 high-speed steel bar, and the second connecting part is processed at the tail of each T15 high-speed steel bar, so that the head of the current T15 high-speed steel bar and the tail of the adjacent T15 high-speed steel bar can be detachably connected, and the tail of the current T15 high-speed steel bar and the head of the adjacent T15 high-speed steel bar can be detachably connected.
Further, the first connecting part is a screw rod, and the second connecting part is an internal threaded hole matched with the threads of the screw rod; or alternatively
The first connecting portion is an internal threaded hole, and the second connecting portion is a screw rod matched with threads of the internal threaded hole.
In the step 2, the diameter ratio of the coil inner diameter of the heating coil to the diameter of the T15 high-speed steel bar is (1.12:1) - (1.62:1).
Further, in step 2, the inert gas is any one of argon, nitrogen or helium. Further preferably, the purity of the inert gas is 99.99% or more.
Further, in the step 3, a beating auxiliary ultrasonic device is arranged at the powder outlet of the separator, the shaking speed of the beating auxiliary ultrasonic device is 200 times/min-500 times/min, the shaking speed is 100 times/min-400 times/min, and the ultrasonic frequency is 10 kHz-70 kHz.
In step 3, the weight ratio of the powder having a particle diameter of 150 μm or less in the target T15 high-speed steel powder is 97% or more.
Further, the T15 high-speed steel bar is replaced by a T10 high-speed steel bar.
Further, the EIGA equipment is connected with the vacuum charging bucket in a clamp connection mode; the heating coil is made of a double-layer gradient material, for example, an outer thin layer is made of a ceramic material, such as boron nitride, aluminum oxide, silicon nitride and the like, and an inner core is made of a metal material, such as copper, copper alloy and the like.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1) According to the invention, parameters such as the rotation speed, the feeding speed, the power supply of a heating coil, the gas flow and the like of the T15 high-speed steel bar are adjusted to control the grain size, the fine powder yield and the like of the T15 high-speed steel powder;
2) The invention adopts the proper ratio of the inner diameter of the coil to the diameter of the T15 high-speed steel bar, can prevent the conductive ignition phenomenon from happening between the bar and the coil, is beneficial to increasing smelting power, improving the yield of fine powder and greatly reducing the ratio of slag;
3) Compared with the traditional VIGA technology, the preparation method provided by the invention has the advantages that the crucible is not used, the whole process is in inert gas or high vacuum atmosphere, and the prepared powder has higher purity, less introduced impurities, less pollution and the like; and the T15 high-speed steel powder prepared by adopting the EIGA gas atomization process has the advantages of lower oxygen content of the powder, higher fine powder yield, lower cost and the like, and opens up a new path for producing the T-series high-speed steel powder with good quality. In addition, the invention has simple process and strong operability, the weight ratio of the powder with the particle diameter less than or equal to 150 mu m can reach more than 97 percent, the cost is greatly reduced, and the invention is suitable for mass industrialized production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate principles of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method for preparing T15 high-speed steel powder by an EIGA gas atomization process provided by the invention;
FIG. 2 is a scanning electron microscope image and element distribution of the T15 high-speed steel powder prepared in example 1 of the present invention;
FIG. 3 is an enlarged scanning electron microscope image and element distribution of the T15 high-speed steel powder prepared in example 1 of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are not intended to represent all embodiments consistent with the invention. Rather, they are merely examples of certain aspects of the invention that are consistent with the details of the claims below.
The present invention will be described in further detail below with reference to the drawings and examples for better understanding of the technical solutions of the present invention to those skilled in the art.
Example 1
Referring to fig. 1, the embodiment provides a method for preparing T15 high-speed steel powder by using an EIGA gas atomization process, which specifically includes the following steps:
Step 1, selecting a processed T15 high-speed steel bar as a raw material; the T15 high-speed steel bars are standard grade high-speed steel, a first connecting part (screw rod) and a second connecting part (internal threaded hole) are correspondingly processed at two ends of all the T15 high-speed steel bars, and threads of the screw rod are matched with threads of the internal threaded hole; when a plurality of T15 high-speed steel bars are connected, the head of the current T15 high-speed steel bar is connected with the tail of the last T15 high-speed steel bar, and the tail of the current T15 high-speed steel bar is detachably connected with the head of the next T15 high-speed steel bar, so that the bar utilization rate is improved, and the cost is reduced; wherein, the ratio of the inner diameter of the coil to the diameter of the T15 high-speed steel bar is 1.62:1.
Step 2, melting the T15 high-speed steel bar in the step 1 in EIGA equipment, and then performing high-purity argon gas (purity: 99.999%) gas atomization to obtain T15 high-speed steel powder; the technological parameters of the EIGA gas atomization are as follows: the rotation speed of the T15 high-speed steel bar is 5r/min, the feeding speed is 15mm/min, the power of a heating coil is 70kW, the smelting power is 35kW, the vacuum degree is-1 Pa, the gas flow is 750Nm 3/h, and the atomization pressure is 2.5MPa;
the joint of the EIGA equipment and the vacuum charging bucket is changed from a threaded connection structure to a clamp connection structure, so that the repeated disassembly/assembly of field operators is facilitated; the coil is changed into a double-layer gradient material, for example, the outer thin layer is boron nitride, and the inner core is copper, so that the production efficiency is improved.
Step 3, storing the T15 high-speed steel powder obtained by the EIGA in the step 2 in a vacuum tank through a separator along an EIGA equipment pipeline, and vacuum screening after cooling to obtain the required T15 high-speed steel powder (I) with high purity and high fine powder yield, wherein the purity can almost reach 100%, the weight ratio of the powder with the particle size less than or equal to 150 mu m is more than 98%, and the weight ratio of the powder with the particle size less than or equal to 53 mu m is more than 46%;
Wherein, the separator is equipped with and beats supplementary ultrasonic device (with ultrasonic vibration sieve and beat a kind of play powder device that the sieve is integrated in an organic whole down to increase down powder speed and prevent that powder from sticking at the equipment inner wall), and beat the relevant parameter of supplementary ultrasonic device as follows: the shaking speed is 200 times/min, the vibration speed is 100 times/min, and the ultrasonic frequency is 10kHz.
Fig. 2 is a scanning electron microscope image and an element distribution diagram of the T15 high-speed steel powder prepared in the embodiment 1, and as can be seen from fig. 2, the T15 high-speed steel powder is mostly spherical, the sphericity is good, a small amount of special-shaped powder exists, the powder element components are consistent with the raw material bar, and contains V, cr, fe, co, W, C, O, mn, mo, si, P and S, and no impurity element exists.
Fig. 3 is an enlarged scanning electron microscope and element distribution diagram of the T15 high-speed steel powder prepared in example 1, and it is clear from fig. 3 that the T15 high-speed steel powder has a good sphericity, no impurity element, and a small amount of satellite powder.
Example 2
The embodiment provides a method for preparing T15 high-speed steel powder by an EIGA gas atomization process, which specifically comprises the following steps:
step 1, selecting a processed T15 high-speed steel bar as a raw material; the T15 high-speed steel bars are standard grade high-speed steel, a first connecting part (screw rod) and a second connecting part (internal threaded hole) are correspondingly processed at two ends of all the T15 high-speed steel bars, and threads of the screw rod are matched with threads of the internal threaded hole; when a plurality of T15 high-speed steel bars are connected, the head of the current T15 high-speed steel bar is connected with the tail of the last T15 high-speed steel bar, and the tail of the current T15 high-speed steel bar is detachably connected with the head of the next T15 high-speed steel bar, so that the bar utilization rate is improved, and the cost is reduced; wherein the ratio of the inner diameter of the coil to the diameter of the T15 bar is 1.12:1.
Step 2, melting the T15 high-speed steel bar in the step 1 in EIGA equipment, and then performing high-purity nitrogen gas (purity: 99.999%) gas atomization to obtain T15 high-speed steel powder; the technological parameters of the EIGA gas atomization are as follows: the rotation speed of the T15 high-speed steel bar is 15r/min, the feeding speed is 25mm/min, the power of a heating coil is 110kW, the smelting power is 60kW, the vacuum degree is 5Pa, the gas flow is 900Nm 3/h, and the atomization pressure is 5MPa;
the connection part of the EIGA equipment and the vacuum charging bucket is changed from a threaded connection structure to a clamp connection structure; the coil is changed into a double-layer gradient material, for example, the outer thin layer is alumina, the inner core is copper alloy, so as to improve the production efficiency.
Step 3, storing the T15 high-speed steel powder obtained by the EIGA in the step 2 in a vacuum tank through a separator along an EIGA equipment pipeline, and vacuum screening after cooling to obtain the required T15 high-speed steel powder (II) with high purity and high fine powder yield, wherein the purity can almost reach 100%, the weight ratio of the powder with the particle size less than or equal to 150 mu m is more than 97%, and the weight ratio of the powder with the particle size less than or equal to 53 mu m is more than 42%;
Wherein, the powder mouth position is equipped with the supplementary ultrasonic device of slapping under the separator, and the relevant parameter of supplementary ultrasonic device of slapping is as follows: the shaking rate was 500 times/min, the shaking rate was 400 times/min, and the ultrasonic frequency was 70kHz to increase the powdering rate and prevent the powder from sticking to the inner wall of the apparatus.
Example 3
The embodiment provides a method for preparing T15 high-speed steel powder by an EIGA gas atomization process, which specifically comprises the following steps:
Step 1, selecting a processed T15 high-speed steel bar as a raw material; the T15 high-speed steel bars are standard grade high-speed steel, a first connecting part (an internal threaded hole) and a second connecting part (a screw rod) are correspondingly processed at two ends of all the T15 high-speed steel bars, and threads of the screw rods are matched with threads of the internal threaded holes; when a plurality of T15 high-speed steel bars are connected, the head of the current T15 high-speed steel bar is connected with the tail of the last T15 high-speed steel bar, and the tail of the current T15 high-speed steel bar is detachably connected with the head of the next T15 high-speed steel bar, so that the bar utilization rate is improved, and the cost is reduced; wherein the ratio of the inner diameter of the coil to the diameter of the T15 bar is 1.37:1.
Step 2, melting the T15 high-speed steel bar in the step 1 in EIGA equipment, and then performing high-purity helium gas (purity: 99.999%) gas atomization to obtain T15 high-speed steel powder; the technological parameters of the EIGA gas atomization are as follows: the rotation speed of the bar is 10r/min, the feeding speed of the bar is 20mm/min, the power of a heating coil is 90kW, the smelting power is 47.5kW, the vacuum degree is 2Pa, the gas flow is 825Nm 3/h, and the atomization pressure is 3.75MPa;
The connection part of the EIGA equipment and the vacuum charging bucket is changed from a threaded connection structure to a clamp connection structure; the coil is changed into a double-layer gradient material, for example, the outer thin layer is silicon nitride, and the inner core is copper, so that the production efficiency is improved.
Step 3, storing the T15 high-speed steel powder obtained after the EIGA gas atomization process in the step 2 in a vacuum charging bucket through a separator along an EIGA equipment pipeline, and vacuum screening after cooling to obtain the required T15 high-speed steel powder (III) with high purity and high fine powder yield, wherein the purity can almost reach 100%, the weight ratio of the powder with the particle size less than or equal to 150 mu m is more than 97%, and the weight ratio of the powder with the particle size less than or equal to 53 mu m is more than 45%;
wherein, the powder mouth position under the separator contains the auxiliary ultrasonic device of clapping, and the relevant parameter of auxiliary ultrasonic device of clapping is as follows: the shaking speed was 350 times/min, the vibration speed was 250 times/min, and the ultrasonic frequency was 40kHz to increase the powdering speed and prevent the powder from sticking to the inner wall of the apparatus.
Example 4
The embodiment provides a method for preparing T15 high-speed steel powder by using an EIGA gas atomization process, which is different from embodiment 1 in that the T15 high-speed steel in step 1 is replaced by T10 high-speed steel on the basis of embodiment 1, and the T15 high-speed steel powder with high purity and high fine powder yield can still be obtained by adopting the preparation process parameters similar to those of embodiment 1, embodiment 2 or embodiment 3.
Comparative example 1
If the traditional VIGA gas atomization method is adopted to prepare the T15 high-speed steel powder, the hollow powder rate of the prepared powder is more than 1%, and the purity is low due to the use of a crucible, so that the density after printing is low, and finally the mechanical property is low. The method for preparing the T15 high-speed steel powder has the powder hollow powder rate of less than 0.25%, and the mechanical property of the final product is higher and the production efficiency is improved by discarding the crucible and obviously modifying and optimizing equipment and process compared with the traditional VIGA gas atomization process.
Comparative example 2
If the traditional PREP pulverizing process is adopted to prepare the T15 high-speed steel powder, the weight ratio of the powder with the grain diameter less than or equal to 53 mu m in the prepared powder is less than 20%, namely the powder yield of the powder fine powder prepared by the traditional PREP pulverizing process is lower.
In summary, the invention takes the T15 high-speed steel bar as the raw material, melts the T15 high-speed steel by heating the electrode induction coil of the EIGA equipment, and performs gas atomization under a specific process and parameters thereof, thereby preparing the T15 high-speed steel powder with high purity and high fine powder yield, leading the mechanical property of the final product to be higher and improving the production efficiency.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It will be understood that the invention is not limited to what has been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The method for preparing the T15 high-speed steel powder by using the EIGA gas atomization process is characterized by comprising the following steps of:
step1, selecting a pretreated T15 high-speed steel bar as a raw material;
step 2, melting the T15 high-speed steel bar in EIGA equipment, and then performing high-purity inert gas atomization to obtain T15 high-speed steel powder; wherein, the technological parameters of the gas atomization are as follows: the rotation speed of the T15 high-speed steel bar is 5 r/min-15 r/min, the feeding speed is 15 mm/min-25 mm/min, the power of a heating coil is 70 kW-110 kW, the smelting power is 35 kW-60 kW, the vacuum degree is-1 Pa-5 Pa, the gas flow is 750Nm 3/h~900Nm3/h, and the atomization pressure is 2.5 MPa-5 MPa;
And 3, storing the T15 high-speed steel powder obtained by the gas atomization in the step 2 in a vacuum charging bucket through a separator along an EIGA equipment pipeline, and vacuum screening after cooling to obtain the target T15 high-speed steel powder.
2. The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process according to claim 1, wherein the pretreatment in the step 1 is specifically:
The first connecting part is processed at the head of each T15 high-speed steel bar, and the second connecting part is processed at the tail of each T15 high-speed steel bar, so that the head of the current T15 high-speed steel bar and the tail of the adjacent T15 high-speed steel bar can be detachably connected, and the tail of the current T15 high-speed steel bar and the head of the adjacent T15 high-speed steel bar can be detachably connected.
3. The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process according to claim 2, wherein the first connecting part is a screw rod, and the second connecting part is an internally threaded hole matched with the thread of the screw rod; or alternatively
The first connecting portion is an internal threaded hole, and the second connecting portion is a screw rod matched with threads of the internal threaded hole.
4. The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process according to claim 1, wherein in the step 2, the diameter ratio of the coil inner diameter of the heating coil to the T15 high-speed steel bar is (1.12:1) to (1.62:1).
5. The method for preparing T15 high-speed steel powder by EIGA gas atomization process according to claim 1, wherein in step 2, the inert gas is any one of argon, nitrogen or helium.
6. The method for preparing the T15 high-speed steel powder by the EIGA aerosolization process according to claim 1, wherein in the step 3, a slapping auxiliary ultrasonic device is arranged at a powder outlet of the separator, the shaking speed of the slapping auxiliary ultrasonic device is 200 times/min-500 times/min, the shaking speed is 100 times/min-400 times/min, and the ultrasonic frequency is 10 kHz-70 kHz.
7. The method for preparing T15 high-speed steel powder by using the EIGA gas atomization process according to claim 1, wherein in the step 3, the weight ratio of the powder with the particle size of less than or equal to 150 μm in the target T15 high-speed steel powder is more than 97%.
8. The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process according to any one of claims 1 to 7, wherein the T15 high-speed steel bar is replaced by a T10 high-speed steel bar.
9. The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process according to any one of claims 1 to 7, wherein the EIGA equipment is connected with the vacuum tank by adopting a clamp connection mode.
10. The method for preparing the T15 high-speed steel powder by the EIGA gas atomization process according to any one of claims 1 to 7, wherein the heating coil is made of a double-layer gradient material.
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