CN115418552B - Preparation method of nitrocarburizing low alloy steel machine tool friction plate - Google Patents

Preparation method of nitrocarburizing low alloy steel machine tool friction plate Download PDF

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CN115418552B
CN115418552B CN202211023492.7A CN202211023492A CN115418552B CN 115418552 B CN115418552 B CN 115418552B CN 202211023492 A CN202211023492 A CN 202211023492A CN 115418552 B CN115418552 B CN 115418552B
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friction plate
alloy steel
nitrocarburizing
low alloy
machine tool
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CN115418552A (en
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鲍玉龙
徐长顺
李鼎福
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Qiqihar Inger Machinery Co ltd
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Qiqihar Inger Machinery Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • 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
    • Y02P10/20—Recycling

Abstract

A preparation method of a nitrocarburizing low alloy steel machine tool friction plate belongs to the technical field of ferrous metallurgy. The method solves the problems that the hardness of the internal matrix is low after carburization of the existing low-carbon steel, the anti-seizure and anti-fatigue strength is poor, the deformation is easy, and the durability is poor. The method comprises the following steps: 1. determining a target value of the alloy steel composition; 2. melting, deoxidizing, slagging and deslagging; 3. tapping, pouring a steel billet, cutting a plate, cutting into a low alloy steel friction plate, and carrying out fine grinding and nitrocarburizing treatment after quenching and tempering treatment to obtain the nitrocarburizing low alloy steel machine tool friction plate. The hardness HRC55-60 of the nitrocarburizing low alloy steel machine tool friction plate is improved by about 40% compared with the carburized hardness of low carbon steel, and the wear resistance is improved by more than one time. The seizure resistance of the surface of the nitrocarburizing alloy steel friction plate is improved, the fatigue strength is good, the friction plate is not easy to deform, and the service life of the friction plate is prolonged due to the advantages. The invention is suitable for preparing the nitrocarburizing low alloy steel machine tool friction plate.

Description

Preparation method of nitrocarburizing low alloy steel machine tool friction plate
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a preparation method of a nitrocarburizing low alloy steel machine tool friction plate.
Background
Friction plates are an essential component of a machine tool system that functions to slow down or stop the cutting mechanism that operates the machine tool. The quality of the friction plate is directly related to the processing quality, the production efficiency and the safety of the machine tool. Although the development of friction plates has been rapid in recent years, and many high technologies such as powder metallurgy are applied to the field of machine tool friction plates, conventional friction plates made of steel are still being used in large quantities due to high cost. The traditional steel friction plate is generally carburized by low-carbon steel and then integrally quenched, and has the defects of high surface hardness, poor matrix hardness, poor anti-seizing and anti-fatigue strength, easy deformation and durability.
In recent years, nitriding technology has been widely applied to chemical heat treatment of steel surfaces, and the nitrocarburizing technology can well improve the hardness, wear resistance and anti-seizure capability of the steel surfaces, and the performance characteristics of the nitrocarburizing technology are more suitable for the use characteristics of machine tool friction plates, and the use period is improved by more than 100%. The conventional machine tool friction plate is generally carburized by using low-carbon steel, and then quenched, wherein the hardness HRC is 40-45. The nitriding effect of the low-carbon steel is not very good, and in order to apply the nitriding technology to the machine tool friction plate well, a steel material suitable for the nitriding technology needs to be developed, and the steel material is favorable for diffusing nitrogen atoms into the machine tool friction plate and also ensures that a matrix maintains certain strength and toughness.
Firstly, developing a low alloy steel, adding a plurality of alloying elements which are favorable for nitriding, smelting into a low alloy steel billet, cutting into a friction plate, quenching and tempering, fine grinding, nitrocarburizing, and improving the hardness of HRC by about 40 percent and the wear resistance by more than one time compared with the carburized hardness of low carbon steel.
Disclosure of Invention
The invention aims to solve the problems of low hardness of an internal matrix, poor anti-seizure and anti-fatigue strength, easy deformation and durability of the existing low-carbon steel after carburization, and provides a preparation method of a nitrocarburized low-alloy steel machine tool friction plate.
The preparation method of the nitrocarburizing low alloy steel machine tool friction plate comprises the following steps:
1. the alloy steel component target value comprises the following components in percentage by weight: c:0.25 to 0.32 percent of Si:0.2 to 0.4 percent of Mn:0.9% -1.2%, P: less than or equal to 0.03 percent, S: less than or equal to 0.03 percent, cr:0.3% -0.5%, mo:0.2% -0.3%, V:0.4% -0.6%, and the balance of Fe;
2. weighing common low carbon steel scraps and alloys as raw materials according to the component target values in the first step, then charging into an intermediate frequency furnace for electric melting, adding aluminum accounting for 0.1-0.2% of the total mass of molten steel into the intermediate frequency furnace for final deoxidation when the temperature of the molten steel reaches 1620-1670 ℃, adding a slag remover accounting for 0.2-0.3% of the total mass of molten steel into the intermediate frequency furnace for slagging and deslagging when the temperature of the molten steel reaches 1600-1640 ℃;
3. after deslagging, tapping when the temperature of molten steel reaches 1620-1650 ℃, pouring a low alloy steel billet at the temperature of 1590-1620 ℃, cutting into a low alloy steel plate, cutting into a low alloy steel friction plate, performing fine grinding and nitrocarburizing treatment after quenching and tempering treatment to obtain the nitrocarburizing low alloy steel machine tool friction plate, and completing the preparation method.
The low alloy steel prepared by the method is added with alloying elements which are favorable for nitriding, and is manufactured into a low alloy steel billet through smelting, is manufactured into a friction plate through cutting, is subjected to thermal refining, is subjected to finish grinding, is subjected to nitrocarburizing, has the hardness of HRC55-60, and is improved by about 40% compared with the carburized hardness of the low carbon steel, and the wear resistance is improved by more than one time.
The nitrocarburized low alloy steel part is subjected to tempering treatment before carbonitriding so as to obtain tempered sorbite tissues. The common low-carbon steel can not be subjected to quenching and tempering treatment, and has poor effect, so that the low-carbon steel is not suitable for nitrocarburizing. The low alloy steel prepared by the method can obtain fine and uniform tempered sorbite tissues through quenching and tempering, is favorable for chemically adsorbing active atoms of nitrogen by the surface of a steel piece during nitrocarburizing treatment, gradually permeates into the interior of the workpiece to form various nitrogen alloy nitrides, and changes the chemical components and the tissues of the surface layer of the steel piece so as to obtain excellent surface properties. The nitriding is performed while the carbon is permeated, and the micro carbide formed after the carbon permeation can promote the diffusion of nitrogen, so that the permeation promotion effect is achieved.
On one hand, the elements such as chromium, molybdenum, vanadium and the like are easily dissolved in ferrite and improve the solubility of nitrogen in alpha phase, and on the other hand, the other side and the matrix iron form nitrides of the alloy elements, so that the hardness, the wear resistance and the corrosion resistance of a steel part permeation layer are improved, meanwhile, the nitriding layer on the surface forms a certain hardness gradient, the hardness is gradually reduced from outside to inside, the seizure resistance of the surface of the nitrocarburized alloy steel friction plate is improved, the fatigue resistance is good, the deformation is not easy, and the service life of the friction plate is prolonged.
The invention is suitable for preparing the nitrocarburizing low alloy steel machine tool friction plate.
Drawings
FIG. 1 is a drawing showing a tempered sorbite structure of a low alloy steel friction plate subjected to tempering treatment in an embodiment;
FIG. 2 is a physical diagram of a nitrocarburizing low alloy steel machine tool friction plate in the embodiment;
FIG. 3 shows the metallographic structure of the friction plate of the nitrocarburizing low alloy steel machine tool in the example.
Detailed Description
The technical scheme of the invention is not limited to the specific embodiments listed below, and also includes any combination of the specific embodiments.
The first embodiment is as follows: the preparation method of the nitrocarburizing low alloy steel machine tool friction plate in the embodiment comprises the following steps:
1. the alloy steel component target value comprises the following components in percentage by weight: c:0.25 to 0.32 percent of Si:0.2 to 0.4 percent of Mn:0.9% -1.2%, P: less than or equal to 0.03 percent, S: less than or equal to 0.03 percent, cr:0.3% -0.5%, mo:0.2% -0.3%, V:0.4% -0.6%, and the balance of Fe;
2. weighing common low carbon steel scraps and alloys as raw materials according to the component target values in the first step, then charging into an intermediate frequency furnace for electric melting, adding aluminum accounting for 0.1-0.2% of the total mass of molten steel into the intermediate frequency furnace for final deoxidation when the temperature of the molten steel reaches 1620-1670 ℃, adding a slag remover accounting for 0.2-0.3% of the total mass of molten steel into the intermediate frequency furnace for slagging and deslagging when the temperature of the molten steel reaches 1600-1640 ℃;
3. after deslagging, tapping when the temperature of molten steel reaches 1620-1650 ℃, pouring a low alloy steel billet at the temperature of 1590-1620 ℃, cutting into a low alloy steel plate, cutting into a low alloy steel friction plate, performing fine grinding and nitrocarburizing treatment after quenching and tempering treatment to obtain the nitrocarburizing low alloy steel machine tool friction plate, and completing the preparation method.
In the second step of the implementation mode, the raw materials are filled into the intermediate frequency furnace, and when the raw materials are required to be filled conveniently, the intermediate frequency furnace is completely filled, so that the raw materials are tightly fastened and loosened; refractory large blocks are charged to the high temperature region of the furnace walls and hearth and small blocks are charged to the lower temperature region of the upper portion of the furnace interior.
In the second step of the embodiment, 55% -65% of power is supplied in the first few minutes, and the power is gradually increased to the maximum value after the constant current surge is stopped; in the electric melting process, the material should be poked in time to prevent bridging.
In the third step of the embodiment, the sizes and the shapes of the low alloy steel plate and the low alloy steel friction plate are cut according to actual production requirements.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is that the alloy steel composition target value in the first step is as follows by weight percentage: c:0.29%, si:0.31%, mn:1.18%, P:0.023%, S:0.016%, cr:0.47%, mo:0.25%, V:0.55%, and the balance of Fe. Other steps and parameters are the same as in the first embodiment.
And a third specific embodiment: the first difference between the present embodiment and the specific embodiment is that in the common low carbon steel scrap in the second step, C is less than or equal to 0.32%, mn is less than or equal to 1.0%, si is less than or equal to 0.40%, P is less than or equal to 0.030%, and S is less than or equal to 0.030%. Other steps and parameters are the same as in the third embodiment.
The specific embodiment IV is as follows: the first difference between the present embodiment and the specific embodiment is that in the second step, the aluminum is pure aluminum wire or pure aluminum block with the content of 99.90%. Other steps and parameters are the same as in the first embodiment.
Fifth embodiment: the present embodiment is the same as the specific embodiment, in which the slag remover in the second step: 71-76wt% of SiO 2 11-16wt% of Al 2 O 3 2-5wt% of Fe 2 O 3 And 3-5 wt% of CaO. Other steps and parameters are the same as in the first embodiment.
Specific embodiment six: this embodiment is accompanied by the specific embodiment in which the dimensions of the cast low alloy billet in step three are 160×160×13mm. Other steps and parameters are the same as in the first embodiment.
Seventh embodiment: in the present embodiment, as well as the specific embodiment, DK7740 electric spark numerical control cutting machine is used for the cutting in the third step. Other steps and parameters are the same as in the first embodiment.
Eighth embodiment: the present embodiment is the same as the specific embodiment in that the tempering in the third step: and (3) placing the low alloy steel friction plate in a RQ-90-9 well chamber kiln, heating to 870-890 ℃, preserving heat for 50-60 min, quenching in water at 18-30 ℃, cooling to room temperature, placing in the RQ-90-9 well chamber kiln again, heating to 580-600 ℃ and preserving heat for 60-90 min, pulling out, straightening, and cooling to room temperature to finish the quenching and tempering treatment. Other steps and parameters are the same as in the first embodiment.
Detailed description nine: this embodiment, together with the specific embodiment, is the fine grinding described in step three: and (3) carrying out fine grinding on a plane grinding machine with the model MT7180 according to the standard size required by the actual production of the low alloy steel friction plate. Other steps and parameters are the same as in the first embodiment.
Detailed description ten: the present embodiment is the same as the specific embodiment, in which the nitrocarburizing treatment in the third step is performed as follows:
a. vacuumizing a pulse vacuum resistance furnace until the pressure is less than 0.135Pa, heating to 400 ℃, and preheating for 60min;
b. continuously heating to 565 ℃ after the preheating is finished, and simultaneously filling NH 3 And CO 2 Performing nitrocarburizing, controlling the decomposition rate to be 52-57%, stopping inflating after 210 min, and discharging after air cooling to 150 ℃ to finish nitrocarburizing treatment;
wherein said charging of NH 3 Is 3.5m 3 /h, CO is charged 2 Is 5m 3 /h。
Other steps and parameters are the same as in the first embodiment.
The beneficial effects of the invention are verified by the following examples:
examples:
the preparation method of the nitrocarburizing low alloy steel machine tool friction plate comprises the following steps:
1. the alloy steel component target value comprises the following components in percentage by weight: c:0.25 to 0.32 percent of Si:0.2 to 0.4 percent of Mn:0.9% -1.2%, P: less than or equal to 0.03 percent, S: less than or equal to 0.03 percent, cr:0.3% -0.5%, mo:0.2% -0.3%, V:0.4% -0.6%, and the balance of Fe;
2. weighing common low carbon steel scraps and alloy as raw materials according to the component target value in the first step, then charging into an intermediate frequency furnace for electric melting, adding aluminum accounting for 0.15% of the total mass of molten steel into the intermediate frequency furnace for final deoxidation when the temperature of the molten steel reaches 1650 ℃, adding a slag remover accounting for 0.25% of the total mass of molten steel into the intermediate frequency furnace for slagging and deslagging when the temperature of the molten steel after deoxidation is 1620 ℃;
3. after deslagging, tapping when the temperature of molten steel reaches 1630 ℃, pouring a low alloy steel billet at 1600 ℃, cutting into a low alloy steel plate, cutting into a low alloy steel friction plate, carrying out fine grinding and nitrocarburizing treatment after quenching and tempering treatment to obtain the nitrocarburizing low alloy steel machine tool friction plate, and completing the preparation method.
In the second step of the embodiment, the molten steel comprises the following components in percentage by weight: c:0.29%, si:0.31%, mn:1.18%, P:0.023%, S:0.016%, cr:0.47%, mo:0.25%, V:0.55%, and the balance of Fe.
In the second step of this embodiment, the aluminum is pure aluminum wire or pure aluminum block with a content of 99.90%.
The deslagging agent in the second step of the embodiment: 75wt% SiO 2 15wt% of Al 2 O 3 5wt% Fe 2 O 3 And 5wt% CaO.
The dimensions of the cast low alloy billet in step three of this example were 160×160×13mm.
In the third step of the embodiment, the DK7740 electric spark numerical control cutting machine is adopted for cutting.
In the third step of this embodiment, the heat and humidity treatment is performed: and (3) placing the low alloy steel friction plate in a RQ-90-9 well chamber kiln, heating to 880 ℃, preserving heat for 50-60 min, quenching in water at 25 ℃, cooling to room temperature, placing in the RQ-90-9 well chamber kiln again, heating to 590 ℃ and preserving heat for 70min, pulling out, straightening, and cooling to room temperature to finish the quenching and tempering treatment.
The dimensions of the low alloy steel sheet material in step three of this example were 160×160×4.5mm.
In the third step of this embodiment, the following steps are performed: and (3) carrying out fine grinding on a plane grinding machine with the model MT7180 according to the standard size required by the actual production of the low alloy steel friction plate.
The nitrocarburizing treatment process in the step three of the embodiment is as follows:
a. vacuumizing a pulse vacuum resistance furnace until the pressure is less than 0.135Pa, heating to 400 ℃, and preheating for 60min;
b. continuously heating to 565 ℃ after the preheating is finished, and simultaneously filling NH 3 And CO 2 Performing nitrocarburizing, controlling the decomposition rate to be 52-57%, stopping inflating after 210 min, and discharging after air cooling to 150 ℃ to finish nitrocarburizing treatment;
wherein said charging of NH 3 Is 3.5m 3 /h, CO is charged 2 Is 5m 3 /h。
The model of the pulse vacuum resistance furnace adopted in the embodiment is RNo _60-6KM; and wiping the refined low alloy steel friction wiping sheet cleanly by using a gasoline rag, loading the cleaned low alloy steel friction wiping sheet into a workpiece cage, hoisting the workpiece cage into a furnace, covering an upper cover, and starting vacuumizing and preheating.
In the third step of the embodiment, after the low alloy steel friction plate is subjected to quenching and tempering treatment, a tempered sorbite structure of the low alloy steel friction plate is obtained, as shown in fig. 1, and fine and uniform tempered sorbite structures are obtained, so that active atoms of nitrogen are chemically adsorbed by the surface of a steel piece during nitrocarburizing treatment and gradually permeate into the interior of the workpiece to form various uniform and fine alloy nitrides of nitrogen, so that coarse massive or netlike nitrides are avoided, and the chemical composition and structure of the surface layer of the steel piece are changed, and excellent surface performance is obtained. The fine and uniform tempered sorbite structure is also beneficial to nitriding and carbon infiltration, because the micro carbide formed after carbon infiltration can promote nitrogen diffusion and plays a role in promoting infiltration.
The embodiment of the obtained nitrocarburizing low alloy steel machine tool friction plate is shown in figure 2; the metallographic structure is shown in figure 3, the outermost layer is called a white and bright layer, 0.012mm is a nitrogen compound layer on the surface of a nitrocarburizing workpiece, and the thickness of a region which is shown by an arrow c under a microscope and is white is a white and bright layer, and the thickness of a region which is shown by a line ab and is a vertical distance is the depth of the nitrogen layer because the texture of the nitrogen compound layer is hard and is not easy to corrode.
The performance indexes of the nitrocarburized low alloy steel machine tool friction plate obtained in the example are shown in table 1.
TABLE 1
Vickers hardness of HV 0.2 Rockwell hardness HRC White bright layer mm Nitriding layer mm Nitride grade Brittleness level
660 58 0.01 0.20 1 1

Claims (8)

1. The preparation method of the nitrocarburizing low alloy steel machine tool friction plate is characterized by comprising the following steps of:
1. the alloy steel component target value comprises the following components in percentage by weight: c:0.25 to 0.32 percent of Si:0.2 to 0.4 percent of Mn:0.9% -1.2%, P: less than or equal to 0.03 percent, S: less than or equal to 0.03 percent, cr:0.3% -0.5%, mo:0.2% -0.3%, V:0.4% -0.6%, and the balance of Fe;
2. weighing common low carbon steel scraps and alloys as raw materials according to the component target values in the first step, then charging into an intermediate frequency furnace for electric melting, adding aluminum accounting for 0.1-0.2% of the total mass of molten steel into the intermediate frequency furnace for final deoxidation when the temperature of the molten steel reaches 1620-1670 ℃, adding a slag remover accounting for 0.2-0.3% of the total mass of molten steel into the intermediate frequency furnace for slagging and deslagging when the temperature of the molten steel reaches 1600-1640 ℃;
3. after deslagging, tapping when the temperature of molten steel reaches 1620-1650 ℃, pouring a low alloy steel billet at the temperature of 1590-1620 ℃, cutting into a low alloy steel plate, cutting into a low alloy steel friction plate, performing fine grinding and nitrocarburizing treatment after quenching and tempering treatment to obtain a nitrocarburizing low alloy steel machine tool friction plate, and finishing the preparation method;
the quenching and tempering process is to place the low alloy steel friction plate in a RQ-90-9 well chamber kiln, heat the friction plate to 870-890 ℃ and keep the temperature for 50-60 min, then quench the friction plate in water at 18-30 ℃, place the friction plate in the RQ-90-9 well chamber kiln again after cooling the friction plate to room temperature, heat the friction plate to 580-600 ℃ and keep the temperature for 60-90 min, pull out and straighten the friction plate and cool the friction plate to room temperature, thus finishing the quenching and tempering process;
wherein the nitrocarburizing treatment comprises the following steps:
a. vacuumizing a pulse vacuum resistance furnace until the pressure is less than 0.135Pa, heating to 400 ℃, and preheating for 60min;
b. continuously heating to 565 ℃ after the preheating is finished, and simultaneously filling NH 3 And CO 2 Performing nitrocarburizing, controlling the decomposition rate to be 52-57%, stopping aerating after 210 min, and air-cooling to 150 DEG CDischarging from the furnace to finish nitrocarburizing treatment;
wherein said charging of NH 3 Is 3.5m 3 /h, CO is charged 2 Is 5m 3 /h。
2. The method for preparing the nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein the alloy steel composition target value in the step one comprises the following components in percentage by weight: c:0.29%, si:0.31%, mn:1.18%, P:0.023%, S:0.016%, cr:0.47%, mo:0.25%, V:0.55%, and the balance of Fe.
3. The method for preparing the nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein in the second step, C is less than or equal to 0.32%, mn is less than or equal to 1.0%, si is less than or equal to 0.40%, P is less than or equal to 0.030% and S is less than or equal to 0.030% in the common low carbon steel scrap steel.
4. The method for preparing the nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein in the second step, the aluminum is pure aluminum wire or pure aluminum block with the content of 99.90%.
5. The method for preparing the nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein in the second step, the slag remover is as follows: 71-76wt% of SiO 2 11-16wt% of Al 2 O 3 2-5wt% of Fe 2 O 3 And 3-5 wt% of CaO.
6. The method for manufacturing a nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein the size of the cast low alloy steel billet in the third step is 160×160×13mm.
7. The method for preparing the nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein in the third step, DK7740 electric spark numerical control cutting machine tools are adopted for cutting.
8. The method for preparing a nitrocarburizing low alloy steel machine tool friction plate according to claim 1, wherein in the third step, the following steps are adopted: and (3) carrying out fine grinding on a plane grinding machine with the model MT7180 according to the standard size required by the actual production of the low alloy steel friction plate.
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CN110565025A (en) * 2019-10-25 2019-12-13 燕山大学 preparation method of ultrahigh-strength high-carbon alloy steel
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CN1335417A (en) * 2000-07-21 2002-02-13 湖南省高程科技有限公司 High-temperature antiwear alloy steel and its production process
CN103774085A (en) * 2014-01-03 2014-05-07 华南理工大学 High-nitrogen austenite layer in low-carbon alloy steel surface preparation and preparation method thereof
CN105063492A (en) * 2015-08-13 2015-11-18 武汉钢铁(集团)公司 Hot-rolled steel for car friction plate and preparation method of hot-rolled steel
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