CN114523111B - Method for carrying out surface strengthening on copper-based powder metallurgy component by adopting arc remelting - Google Patents
Method for carrying out surface strengthening on copper-based powder metallurgy component by adopting arc remelting Download PDFInfo
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- CN114523111B CN114523111B CN202210038901.4A CN202210038901A CN114523111B CN 114523111 B CN114523111 B CN 114523111B CN 202210038901 A CN202210038901 A CN 202210038901A CN 114523111 B CN114523111 B CN 114523111B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 14
- 239000010949 copper Substances 0.000 title claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 230000032683 aging Effects 0.000 claims abstract description 9
- 239000006104 solid solution Substances 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims description 28
- 238000003825 pressing Methods 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 21
- 238000003466 welding Methods 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 26
- 238000005253 cladding Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 5
- 210000001787 dendrite Anatomy 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Powder Metallurgy (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a method for carrying out surface strengthening on a copper-based powder metallurgical component by adopting arc remelting, which comprises the following specific steps: step 1, preparing alloy powder; step 2, preparing a powder metallurgy component; step 3, arc remelting is conducted on the surface of the powder metallurgy component; step 4, carrying out solid solution and aging heat treatment on the remelted component; and 5, surface treatment. The method can prepare a dense remelting strengthening layer on the surface of the powder metallurgy component, reduce surface pores and refine surface grains, thereby improving the surface hardness and the wear resistance.
Description
Technical Field
The invention belongs to the technical field of metal material surface modification, and particularly relates to a method for carrying out surface strengthening on a copper-based powder metallurgical component by adopting arc remelting.
Background
In the field of mechanical manufacturing, powder metallurgy is a relatively common forming method. The powder metallurgy is a material manufacturing method for obtaining parts by using metal powder as a raw material and pressing and sintering, and has the advantages of saving materials, high manufacturing precision and being capable of forming parts with complex shapes. At present, powder metallurgy is widely applied to industrial production, and various materials such as iron-based, copper-based, aluminum-based, silver-based and the like can be manufactured by using the method. However, the fluidity of the metal powder is poor, the internal pores are difficult to completely eliminate, the density of the component manufactured by adopting the powder metallurgy technology is low, the strength, toughness and other mechanical properties of the component are seriously affected, and the surface wear resistance of the component can not meet the service requirement under certain heavy load conditions.
The surface modification is an important means for improving the wear resistance of the surface of the material, and the currently commonly used material surface modification method mainly comprises laser remelting, electron beam remelting, arc remelting and the like. The method utilizes a heat source to melt the surface layer part of the material and quickly cool the material, thereby obtaining a surface layer structure with compact, fine grains and higher strength and hardness and having better strengthening effect. However, the laser remelting and the electron beam remelting have higher cost and higher requirements on process, equipment and processing conditions, and the arc remelting can be directly carried out by utilizing welding equipment, so that the method has the advantages of low cost, simplicity and convenience in operation, high flexibility and the like, and therefore, the method has important significance in applying the arc remelting method to the surface strengthening of powder metallurgy components.
Disclosure of Invention
The invention aims to provide a method for carrying out surface strengthening on a copper-based powder metallurgical component by adopting arc remelting, which can prepare a compact strengthening layer on the surface of the copper-based powder metallurgical component and improve the surface hardness and wear resistance of the copper-based powder metallurgical component.
The first technical scheme adopted by the invention is that the method for carrying out surface strengthening on the copper-based powder metallurgy component by adopting arc remelting comprises the following specific steps:
step 1: respectively weighing alloy powder according to mass percent: 15-20% of nickel powder, 6-9% of iron powder, 5-8% of chromium powder, 1-5% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
step 2: uniformly mixing the alloy powder weighed in the step 1, putting the mixture into a die, pre-pressing the mixture, and then performing hot-pressing sintering to obtain a required powder metallurgy component;
Step 3: fixing the component prepared in the step 2 by using a clamp, adjusting parameters of a welding machine, and remelting the surface of the powder metallurgy component by using TIG welding equipment;
step 4: cooling the remelted component to room temperature, and then placing the remelted component into a box-type furnace for heat treatment;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
The present invention is also characterized in that,
In the step 2, the pre-pressing process parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min.
In the step 2, the hot press sintering process parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h.
In the step 3, arc remelting process parameters are as follows: remelting current is 80A-130A, remelting speed is 0.1 m/min-0.15 m/min, shielding gas is 99.99% argon, and gas flow is 15L/min.
In the step 4, the heat treatment process is as follows: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging.
The beneficial effects of the invention are as follows:
(1) The method for carrying out surface strengthening on the copper-based powder metallurgy component by adopting arc remelting can reduce or even eliminate pores on the surface of the powder metallurgy material, densify the surface of the powder metallurgy material, and further improve the surface performance.
(2) The method for carrying out surface strengthening on the copper-based powder metallurgy component by adopting the arc remelting can refine grains on the surface of the powder metallurgy component due to the characteristic of high cooling speed of the arc remelting, and improve the performances of surface hardness, wear resistance and the like.
(3) Compared with the methods of laser remelting, electron beam remelting and the like, the method for carrying out surface strengthening on the copper-based powder metallurgical component by adopting arc remelting has the advantages of low cost, simplicity in operation, lower requirements on equipment, personnel and technology, and suitability for mass production.
Drawings
FIG. 1 is a microstructure of an arc remelting layer of a powder metallurgy component prepared in example 1 of the invention;
FIG. 2 is a microstructure of the arc remelting layer of the powder metallurgy component prepared in example 2 of the present invention;
FIG. 3 is a microstructure of the arc remelting layer of the powder metallurgy component prepared in example 3 of the present invention;
FIG. 4 is a microstructure of the arc remelting layer of the powder metallurgy component prepared in example 4 of the present invention;
FIG. 5 is a microstructure of the arc remelting layer of the powder metallurgy component prepared in example 5 of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a method for carrying out surface strengthening on a copper-based powder metallurgical component by adopting arc remelting, which comprises the following specific steps:
step 1: respectively weighing alloy powder according to mass percent: 15-20% of nickel powder, 6-9% of iron powder, 5-8% of chromium powder, 1-5% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
step 2: uniformly mixing the alloy powder weighed in the step 1, putting the mixture into a die, pre-pressing the mixture, and then performing hot-pressing sintering to obtain a required powder metallurgy component;
In the step 2, the pre-pressing process parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min;
In the step 2, the hot press sintering process parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h;
Step 3: fixing the component prepared in the step 2 by using a clamp, adjusting parameters of a welding machine, and remelting the surface of the powder metallurgy component by using TIG welding equipment;
In the step 3, arc remelting process parameters are as follows: remelting current is 80A-130A, remelting speed is 0.1 m/min-0.15 m/min, shielding gas is 99.99% argon, and gas flow is 15L/min;
step 4: cooling the remelted component to room temperature, and then placing the remelted component into a box-type furnace for heat treatment;
In the step 4, the heat treatment process is as follows: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
Example 1
Step 1: respectively weighing alloy powder according to mass percent: 17.7% of nickel powder, 7% of iron powder, 7.2% of chromium powder, 1.2% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
Step 2: and (3) uniformly mixing the alloy powder weighed in the step (1), and putting the mixture into a die for pre-pressing, wherein the pre-pressing technological parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min; and then hot-pressing sintering, wherein the technological parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h, so that the required powder metallurgy component is prepared;
Step 3: and (3) fixing the component prepared in the step (2) by using a clamp, adjusting parameters of a welding machine, remelting the surface of the powder metallurgy component by using TIG welding equipment, wherein the arc remelting process parameters are as follows: remelting current 120A, remelting speed 0.15m/min, and protective gas of 99.99% argon gas, wherein the gas flow is 15L/min;
step 4: after the remelted component is cooled to room temperature, placing the remelted component into a box-type furnace for heat treatment, wherein the heat treatment process comprises the following steps: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
The microstructure of the arc remelting layer of the powder metallurgy component prepared in example 1 is shown in fig. 1, and the remelting layer has no defects such as cracks and air holes, and the microstructure is mainly fine dendrites. The average hardness of the cladding layer is 212.5HV 0.2 through mechanical property test; through a friction and wear test, the wear amount of the cladding layer is 2.5mg, the friction coefficient is 0.219, and the wear resistance is good.
Example 2
Step 1: respectively weighing alloy powder according to mass percent: 17.7% of nickel powder, 6% of iron powder, 7.2% of chromium powder, 1.2% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
Step 2: and (3) uniformly mixing the alloy powder weighed in the step (1), and putting the mixture into a die for pre-pressing, wherein the pre-pressing technological parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min; and then hot-pressing sintering, wherein the technological parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h, so that the required powder metallurgy component is prepared;
Step 3: and (3) fixing the component prepared in the step (2) by using a clamp, adjusting parameters of a welding machine, remelting the surface of the powder metallurgy component by using TIG welding equipment, wherein the arc remelting process parameters are as follows: remelting current 110A, remelting speed 0.15m/min, and protective gas of 99.99% argon gas, and gas flow 15L/min;
step 4: after the remelted component is cooled to room temperature, placing the remelted component into a box-type furnace for heat treatment, wherein the heat treatment process comprises the following steps: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
The microstructure of the arc remelting layer of the powder metallurgy component prepared in example 2 is shown in fig. 2, and it can be seen that the remelting layer has no defects such as cracks and air holes, and the microstructure is mainly fine dendrites. The average hardness of the cladding layer is 268.3HV 0.2 through mechanical property test; through a friction and wear test, the wear amount of the cladding layer is 1.6mg, the friction coefficient is 0.217, and the wear resistance is good.
Example 3
Step 1: respectively weighing alloy powder according to mass percent: 15% of nickel powder, 6% of iron powder, 8% of chromium powder, 1.2% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
Step 2: and (3) uniformly mixing the alloy powder weighed in the step (1), and putting the mixture into a die for pre-pressing, wherein the pre-pressing technological parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min; and then hot-pressing sintering, wherein the technological parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h, so that the required powder metallurgy component is prepared;
Step 3: and (3) fixing the component prepared in the step (2) by using a clamp, adjusting parameters of a welding machine, remelting the surface of the powder metallurgy component by using TIG welding equipment, wherein the arc remelting process parameters are as follows: remelting current 130A, remelting speed 0.1m/min, and protective gas of 99.99% argon gas, wherein the gas flow is 15L/min;
step 4: after the remelted component is cooled to room temperature, placing the remelted component into a box-type furnace for heat treatment, wherein the heat treatment process comprises the following steps: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
The microstructure of the arc remelting layer of the powder metallurgy component prepared in example 3 is shown in fig. 3, and it can be seen that the remelting layer has no defects such as cracks and pores, and a large amount of chromium-rich phases are precipitated in the microstructure. The average hardness of the cladding layer is 235.7HV 0.2 through mechanical property test; through a friction and wear test, the wear amount of the cladding layer is 2.1mg, the friction coefficient is 0.216, and the wear resistance is good.
Example 4
Step 1: respectively weighing alloy powder according to mass percent: 18% of nickel powder, 8% of iron powder, 8% of chromium powder, 2% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
Step 2: and (3) uniformly mixing the alloy powder weighed in the step (1), and putting the mixture into a die for pre-pressing, wherein the pre-pressing technological parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min; and then hot-pressing sintering, wherein the technological parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h, so that the required powder metallurgy component is prepared;
Step 3: and (3) fixing the component prepared in the step (2) by using a clamp, adjusting parameters of a welding machine, remelting the surface of the powder metallurgy component by using TIG welding equipment, wherein the arc remelting process parameters are as follows: remelting current 80A, remelting speed 0.1m/min, and protective gas of 99.99% argon gas, wherein the gas flow is 15L/min;
step 4: after the remelted component is cooled to room temperature, placing the remelted component into a box-type furnace for heat treatment, wherein the heat treatment process comprises the following steps: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
The microstructure of the arc remelting layer of the powder metallurgy component prepared in example 4 is shown in fig. 4, and the remelting layer has no defects such as cracks and air holes, and the microstructure is mainly dendrites and chromium-rich precipitated phases. The average hardness of the cladding layer is 266.5HV 0.2 through mechanical property test; through a friction and wear test, the wear amount of the cladding layer is 1.8mg, the friction coefficient is 0.218, and the wear resistance is good.
Example 5
Step 1: respectively weighing alloy powder according to mass percent: 19% of nickel powder, 8.5% of iron powder, 7.5% of chromium powder, 1% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
Step 2: and (3) uniformly mixing the alloy powder weighed in the step (1), and putting the mixture into a die for pre-pressing, wherein the pre-pressing technological parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min; and then hot-pressing sintering, wherein the technological parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h, so that the required powder metallurgy component is prepared;
Step 3: and (3) fixing the component prepared in the step (2) by using a clamp, adjusting parameters of a welding machine, remelting the surface of the powder metallurgy component by using TIG welding equipment, wherein the arc remelting process parameters are as follows: remelting current 100A, remelting speed 0.12m/min, and shielding gas of 99.99% argon gas, wherein the gas flow is 15L/min;
step 4: after the remelted component is cooled to room temperature, placing the remelted component into a box-type furnace for heat treatment, wherein the heat treatment process comprises the following steps: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
The microstructure of the arc remelting layer of the powder metallurgy component prepared in example 5 is shown in fig. 5, and it can be seen that the remelting layer has no defects such as cracks and air holes, and the microstructure is mainly dendrites and chromium-rich precipitated phases. The average hardness of the cladding layer is 272.6HV 0.2 through mechanical property test; through a friction and wear test, the wear amount of the cladding layer is 1.7mg, the friction coefficient is 0.219, and the wear resistance is good.
Claims (1)
1. The method for carrying out surface strengthening on the copper-based powder metallurgical component by adopting arc remelting is characterized by comprising the following specific steps of:
step 1: respectively weighing alloy powder according to mass percent: 15-20% of nickel powder, 6-9% of iron powder, 5-8% of chromium powder, 1-5% of graphite powder and the balance of copper powder, wherein the sum of the mass percentages of the components is 100%;
step 2: uniformly mixing the alloy powder weighed in the step 1, putting the mixture into a die, pre-pressing the mixture, and then performing hot-pressing sintering to obtain a required powder metallurgy component;
In the step 2, the pre-pressing process parameters are as follows: the pre-pressing pressure is 450-550 MPa, and the pressure maintaining time is 1-3 min;
In the step 2, the hot press sintering process parameters are as follows: sintering temperature is 900-950 ℃, sintering pressure is 2-3 MPa, and heat preservation time is 1-1.5 h;
Step 3: fixing the component prepared in the step 2 by using a clamp, adjusting parameters of a welding machine, and remelting the surface of the powder metallurgy component by using TIG welding equipment;
In the step 3, arc remelting process parameters are as follows: remelting current is 80A-130A, remelting speed is 0.1 m/min-0.15 m/min, shielding gas is 99.99% argon, and gas flow is 15L/min;
step 4: cooling the remelted component to room temperature, and then placing the remelted component into a box-type furnace for heat treatment;
In the step 4, the heat treatment process is as follows: 940 ℃ for 1h solid solution+460 ℃ for 1.5h aging;
step 5: grinding the surface of the member after heat treatment to ensure that the surface quality of the member meets the use requirement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210038901.4A CN114523111B (en) | 2022-01-13 | 2022-01-13 | Method for carrying out surface strengthening on copper-based powder metallurgy component by adopting arc remelting |
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|---|---|---|---|
| CN202210038901.4A CN114523111B (en) | 2022-01-13 | 2022-01-13 | Method for carrying out surface strengthening on copper-based powder metallurgy component by adopting arc remelting |
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| Publication Number | Publication Date |
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| CN114523111A CN114523111A (en) | 2022-05-24 |
| CN114523111B true CN114523111B (en) | 2024-04-16 |
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