CN115537716B - Processing method for surface hardening of GH4169 steel die and product thereof - Google Patents
Processing method for surface hardening of GH4169 steel die and product thereof Download PDFInfo
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- CN115537716B CN115537716B CN202211233360.7A CN202211233360A CN115537716B CN 115537716 B CN115537716 B CN 115537716B CN 202211233360 A CN202211233360 A CN 202211233360A CN 115537716 B CN115537716 B CN 115537716B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 238000003672 processing method Methods 0.000 title abstract description 12
- 238000005271 boronizing Methods 0.000 claims abstract description 54
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 12
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 11
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000011049 filling Methods 0.000 claims abstract description 9
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 8
- 239000011591 potassium Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000005485 electric heating Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 150000002500 ions Chemical class 0.000 claims description 6
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- 238000004544 sputter deposition Methods 0.000 claims description 4
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 3
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 3
- -1 ferroboron Chemical compound 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 53
- 239000011248 coating agent Substances 0.000 description 12
- 239000000758 substrate Substances 0.000 description 8
- 230000007704 transition Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 230000008093 supporting effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002345 surface coating layer Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 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
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- C23C8/60—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 solids, e.g. powders, pastes
- C23C8/62—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 solids, e.g. powders, pastes only one element being applied
- C23C8/68—Boronising
- C23C8/70—Boronising of ferrous surfaces
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0605—Carbon
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Physical Vapour Deposition (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
The invention relates to the technical field of metal surface treatment, and discloses a processing method for surface hardening of GH4169 steel die and a product thereof, wherein the processing method comprises the following steps: s1) placing the pretreated workpiece into a heat-resistant tank, then filling a boronizing agent, and ensuring that the boronizing agent is filled and compacted to-be-processed workpiece; s2) placing the heat-resistant tank into a box-type electric heating furnace, heating to 850-880 ℃ and keeping the temperature for 4-8 hours; s3) discharging the workpiece along with a heat-resistant tank, standing and air-cooling to room temperature to obtain a boronized workpiece; the boronizing agent comprises the following raw materials: 8-10wt% of boron carbide, 5-10wt% of ferroboron, 5-10wt% of potassium fluoborate, 5-8wt% of activated carbon and the balance of silicon carbide. Boride composed of FeB phase and Fe 2 B phase is formed on the surface of the workpiece after boronizing treatment, and the boride is a high-hardness phase and has stable chemical property, so that the boronizing layer of the workpiece can keep high hardness and wear resistance below 800 ℃.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a processing method for surface hardening of GH4169 steel die and a product thereof.
Background
GH4169 alloy steel is a high-temperature alloy with high strength and oxidation resistance in a working temperature range, has good hot workability, welding performance and long-term tissue stability, and has good plasticity and toughness, fatigue resistance, oxidation resistance and corrosion resistance at high temperature, so that the alloy is widely applied to the fields of aerospace, nuclear energy and petroleum.
The aluminum profile extrusion die in the prior art is also manufactured by adopting GH4169 alloy to replace H13 steel. Compared with an H13 steel nitriding die, the GH4169 has poor wear resistance and anti-sticking property, so that the service life of the die is short, and the use and popularization of the material in die processing are limited.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide a method for surface hardening of a GH4169 steel mold, which can form a boronized layer on the GH4169 steel mold.
Another object of the present invention is to propose a product using said processing method for surface hardening of GH4169 steel molds, not only comprising a gradient transition layer consisting of a boronizing layer + Cr layer + CrN layer, but also a DLC film.
To achieve the purpose, the invention adopts the following technical scheme:
A method of processing for case hardening of GH4169 steel molds comprising the steps of:
S1) placing the pretreated workpiece into a heat-resistant tank, then filling a boronizing agent, and ensuring that the boronizing agent is filled and compacted to-be-processed workpiece;
S2) placing the heat-resistant tank into a box-type electric heating furnace, heating to 850-880 ℃ and keeping the temperature for 4-8 hours;
s3) discharging the workpiece along with a heat-resistant tank, standing and air-cooling to room temperature to obtain a boronized workpiece;
the boronizing agent comprises the following raw materials in percentage by weight: 8-10wt% of boron carbide, 5-10wt% of ferroboron, 5-10wt% of potassium fluoborate, 5-8wt% of activated carbon and the balance of silicon carbide.
Further, the method also comprises the following steps:
s4) adopting a plasma coating process to deposit a Cr layer on the boronized workpiece with the clean surface, and then depositing a CrN layer to prepare a hardened workpiece;
S5) placing the hardened workpiece with the cleaned surface into a magnetron sputtering plating machine, vacuumizing to 5X10 -3 Pa, filling argon to 0.5-1Pa, sputtering the surface of the hardened workpiece with a bias voltage of 1000-1200V, and simultaneously starting an anode laminar ion source to deposit a DLC film on the surface of the hardened workpiece.
Preferably, in step S5), the furnace pressure of the heating furnace is 0.5Pa, the argon flow is 100ml/min, the acetylene flow is 60ml/min, the bias voltage is 100V, the deposition temperature is 200 ℃, and the deposition time is 2-4h.
Preferably, the particle size of the boron carbide is 40-50 mu m; the particle size of the activated carbon is 150-300 mu m; the particle size of the silicon carbide is 120-180 mu m.
Preferably, the particle size of the boriding agent is 0.5-1mm, and the thickness of the boriding layer of the boriding workpiece is more than 10 mu m.
Further, the preparation of the boriding medium comprises the following steps:
weighing boron carbide, ferroboron, potassium fluoborate, active carbon and silicon carbide according to a certain proportion, putting into a powder mixer for mixing and stirring, and then drying the prepared mixture particles to obtain the boronizing agent.
Preferably, the mixing time is 4-8 hours, and the drying temperature is 80-90 ℃.
Further, the invention provides a GH4169 steel die, which is manufactured by adopting the processing method for surface hardening of the GH4169 steel die.
The technical scheme of the invention has the beneficial effects that: according to the processing method for the surface hardening of the GH4169 steel die, the adopted boronizing agent can be carried out at the temperature of below 900 ℃, a boronizing layer with the thickness of more than 0.10mm can be formed on the surface of the processed workpiece, and the hardness of the boronizing agent reaches more than HV 1200; the boronizing agent is suitable for a solid boronizing process, so that the processing process is easy to operate and has obvious economic advantages; and the boronizing layer is formed at a high speed, has moderate cost, and is suitable for popularization.
Furthermore, the GH4169 steel mold provided by the invention is prepared by adopting the processing method for surface hardening of the GH4169 steel mold, and the surface coating of the GH4169 steel mold not only contains a gradient transition layer consisting of a boronizing layer, a Cr layer and a CrN layer, but also is coated with a DLC film, so that a supporting effect is formed between the surface coating and the substrate, and the binding force between the surface coating and the substrate can be enhanced.
Drawings
FIG. 1 is a metallographic structure diagram of example 1.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments.
In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
A method of processing for case hardening of GH4169 steel molds comprising the steps of:
S1) placing the pretreated workpiece into a heat-resistant tank, then filling a boronizing agent, and ensuring that the boronizing agent is filled and compacted to-be-processed workpiece;
S2) placing the heat-resistant tank into a box-type electric heating furnace, heating to 850-880 ℃ and keeping the temperature for 4-8 hours;
s3) discharging the workpiece along with a heat-resistant tank, standing and air-cooling to room temperature to obtain a boronized workpiece;
the boronizing agent comprises the following raw materials in percentage by weight: 8-10wt% of boron carbide, 5-10wt% of ferroboron, 5-10wt% of potassium fluoborate, 5-8wt% of activated carbon and the balance of silicon carbide.
According to the processing method for the surface hardening of the GH4169 steel die, the adopted boronizing agent can be carried out at the temperature of below 900 ℃, a boronizing layer with the thickness of more than 0.10mm can be formed on the surface of a processed workpiece, and the hardness of the boronizing agent reaches more than HV 1200; the boronizing agent is suitable for a solid boronizing process, so that the processing process is easy to operate and has obvious economic advantages; and the boronizing layer is formed at a high speed, has moderate cost, and is suitable for popularization.
Boron carbide in the boronizing agent is taken as a main boron element source, ferroboron is taken as a supplement, potassium fluoborate is taken as an activating agent, and a better permeable layer can be formed. Boride composed of FeB phase and Fe 2 B phase is formed on the surface of the workpiece after boronizing treatment, and the boride is a high-hardness phase and has stable chemical property, so that the boronizing layer of the workpiece can keep high hardness and wear resistance below 800 ℃.
Further, the method also comprises the following steps:
s4) adopting a plasma coating process to deposit a Cr layer on the boronized workpiece with the clean surface, and then depositing a CrN layer to prepare a hardened workpiece;
S5) placing the hardened workpiece with the cleaned surface into a magnetron sputtering plating machine, vacuumizing to 5X10 -3 Pa, filling argon to 0.5-1Pa, sputtering the surface of the hardened workpiece with a bias voltage of 1000-1200V, and simultaneously starting an anode laminar ion source to deposit a DLC film on the surface of the hardened workpiece.
The GH4169 steel die surface after the DLC film is prepared through boronizing, hardening and magnetron sputtering forms a composite infiltration layer, the composite infiltration layer has uniform structure, good combination with a matrix, smooth and flat surface, greatly improved wear resistance and anti-sticking performance of the die and obviously prolonged service life.
The anode laminar ion source is adopted for auxiliary deposition, so that the diffusion capacity of atoms is improved, crystal grains in a gradient transition layer consisting of a boronizing layer, a Cr layer and a CrN layer are epitaxially grown, a uniform columnar crystal structure is formed, and the crystal grains are fine and have few internal defects, so that the anode laminar ion source has higher strength.
Preferably, in step S5), the furnace pressure of the heating furnace is 0.5Pa, the argon flow is 100ml/min, the acetylene flow is 60ml/min, the bias voltage is 100V, the deposition temperature is 200 ℃, and the deposition time is 2-4h.
The gradient transition layer consisting of the boronizing layer, the Cr layer and the CrN layer is established, so that mutual diffusion of elements between the film layers is facilitated, a structure similar to mechanical locking is formed, a better supporting effect is formed between the elements, and the binding force between the film layers can be enhanced. When a load is applied externally, the plastic deformation can be effectively weakened, and the binding force of the DLC film and the matrix is enhanced.
Preferably, the particle size of the boron carbide is 40-50 mu m; the particle size of the activated carbon is 150-300 mu m; the particle size of the silicon carbide is 120-180 mu m.
The particle sizes of boron carbide, active carbon and silicon carbide in the raw materials are controlled within the above range, so that the performance of the boronizing layer is ensured, and meanwhile, the higher boronizing treatment speed is obtained.
Preferably, the particle size of the boriding agent is 0.5-1mm, and the thickness of the boriding layer of the boriding workpiece is more than 10 mu m.
The particle size of the boronizing agent is 0.5-1mm, the production is convenient, the boronizing speed is high, the boronizing layer has good uniformity, and the thickness of the boronizing layer is more than 10 mu m.
Further, the preparation of the boriding medium comprises the following steps:
weighing boron carbide, ferroboron, potassium fluoborate, active carbon and silicon carbide according to a certain proportion, putting into a powder mixer for mixing and stirring, and then drying the prepared mixture particles to obtain the boronizing agent.
Preferably, the mixing time is 4-8 hours, and the drying temperature is 80-90 ℃.
The boronizing agent can be prepared by adopting a simple mixing and drying process, and has good cost and production efficiency.
Further, the invention provides a GH4169 steel die, which is manufactured by adopting the processing method for surface hardening of the GH4169 steel die.
The prepared GH4169 steel mould has the surface coating layer comprising a gradient transition layer consisting of a boronizing layer, a Cr layer and a CrN layer and a DLC film, wherein the DLC film and the DLC film form a supporting effect, and the binding force between the surface coating layer and a matrix can be enhanced.
Examples 1 to 3 and comparative examples 1 to 3
1. The boronized workpieces of the examples and comparative examples were prepared by the following steps with reference to the raw material ratios and process parameters listed in table 1 using GH4169 die steel as a substrate:
S1) placing the pretreated workpiece into a heat-resistant tank, then filling a boronizing agent, and ensuring that the boronizing agent is filled and compacted to-be-processed workpiece;
S2) placing the heat-resistant tank into a box-type electric heating furnace, heating to 850-880 ℃ and keeping the temperature for 4-8 hours;
S3) discharging the workpiece along with a heat-resistant tank, standing and air cooling to room temperature to obtain the boronized workpiece.
2. The boronizing layer of the boronizing workpiece is analyzed by using a Zeiss Supra 40 field emission scanning electron microscope, whether the metallographic structure of the boronizing layer has bad defects or not is observed, meanwhile, the thickness of the boronizing layer is measured, and the detection result is shown in table 1.
3. The vickers hardness of the infiltrated layer was measured using an MH-500D microhardness tester, and the test results are shown in table 1.
Table 1 raw material ratios, process parameters and test results of examples and comparative examples
As can be seen from the above results in Table 1, the thickness and hardness of the boronizing layers of examples 1 to 3 are satisfactory, the metallographic structure is uniform, the metallographic structure of example 1 is shown in FIG. 1, and the comb-like white portions are boronizing layers.
4. The boronized workpiece prepared in example 2 was taken and the DLC coating of example 2 was prepared as follows:
s4) adopting a plasma coating process to deposit a Cr layer on the boronized workpiece with the clean surface, and then depositing a CrN layer to prepare a hardened workpiece;
S5) placing the hardened workpiece with the cleaned surface into a magnetron sputtering plating machine, vacuumizing to 5X10 -3 Pa, filling argon to 0.5Pa, sputtering the surface of the hardened workpiece with a bias voltage of 1000V, starting an anode laminar ion source, and depositing a DLC film on the surface of the hardened workpiece to obtain the DLC film of the embodiment 2.
5 The coating thickness of the nitriding H13 die steel substrate and example 2 with DLC coating on the surface was measured by using a Zeiss Supra 40 field emission scanning electron microscope, and the detection results are shown in Table 2.
6. The vickers hardness of GH4169 die steel substrate, nitrided H13 die steel substrate and the surface of example 2 having DLC coating on the surface were measured using MH-500D microhardness meter, and the detection results are shown in table 2.
7. The abrasion test of scratches was carried out using an MS-T3000 type frictional abrasion tester, and under the same test conditions, the coating friction coefficient and the abrasion mark width of GH4169 die steel substrate, nitriding H13 die steel substrate and example 2 having DLC coating on the surface were measured, and the measurement results are shown in Table 2.
TABLE 2 results of performance test of die steels of example 2 with DLC coating film on the surface and prior art
In summary, according to the processing method for preparing the surface hardening of the GH4169 steel mold, the prepared surface coating of the GH4169 steel mold not only contains the gradient transition layer consisting of the boronizing layer, the Cr layer and the CrN layer, but also is coated with the DLC film, and the DLC film and the gradient transition layer form a supporting effect mutually, so that the binding force between the surface coating and a matrix can be enhanced.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (6)
1. A method of working for surface hardening of GH4169 steel molds, comprising the steps of:
S1) placing the pretreated workpiece into a heat-resistant tank, then filling a boronizing agent, and ensuring that the boronizing agent is filled and compacted to-be-processed workpiece;
S2) placing the heat-resistant tank into a box-type electric heating furnace, heating to 850-880 ℃ and keeping the temperature for 4-8 hours;
s3) discharging the workpiece along with a heat-resistant tank, standing and air-cooling to room temperature to obtain a boronized workpiece;
s4) adopting a plasma coating process to deposit a Cr layer on the boronized workpiece with the clean surface, and then depositing a CrN layer to prepare a hardened workpiece;
S5) placing the hardened workpiece with the cleaned surface into a magnetron sputtering plating machine, vacuumizing to 5X10 -3 Pa, filling argon to 0.5-1Pa, sputtering the surface of the hardened workpiece with a bias voltage of 1000-1200V, and simultaneously starting an anode laminar ion source to deposit a DLC film on the surface of the hardened workpiece;
the boronizing agent comprises the following raw materials in percentage by weight: 8-10wt% of boron carbide, 5-10wt% of ferroboron, 5-10wt% of potassium fluoborate, 5-8wt% of activated carbon and the balance of silicon carbide;
in the step S5), the furnace pressure of the heating furnace is 0.5Pa, the argon flow is 100ml/min, the acetylene flow is 60ml/min, the bias voltage is 100V, the deposition temperature is 200 ℃, and the deposition time is 2-4h.
2. The method of claim 1, wherein the boron carbide has a particle size of 40-50 μm; the particle size of the activated carbon is 150-300 mu m; the particle size of the silicon carbide is 120-180 mu m.
3. The method of claim 1, wherein the boriding agent has a particle size of 0.5-1mm and the boriding layer of the boriding workpiece has a thickness of greater than 10 μm.
4. The process for the case hardening of GH4169 steel molds according to claim 1, wherein the preparation of the boriding agent comprises the steps of:
weighing boron carbide, ferroboron, potassium fluoborate, active carbon and silicon carbide according to a certain proportion, putting into a powder mixer for mixing and stirring, and then drying the prepared mixture particles to obtain the boronizing agent.
5. A process for the case hardening of GH4169 steel molds according to claim 3, wherein the mixing time is 4-8h and the drying temperature is 80-90 ℃.
6. A GH4169 steel mould produced by the method of any one of claims 2 to 5 for use in case hardening of a GH4169 steel mould.
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| CN103966544A (en) * | 2013-01-30 | 2014-08-06 | 沈阳鼓风机集团齿轮压缩机有限公司 | Ni-based high-temperature alloy surface boronizing agent and use method thereof |
| CN104451536A (en) * | 2014-12-12 | 2015-03-25 | 西安理工大学 | Method for rapidly boriding Q235 steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103966544A (en) * | 2013-01-30 | 2014-08-06 | 沈阳鼓风机集团齿轮压缩机有限公司 | Ni-based high-temperature alloy surface boronizing agent and use method thereof |
| CN104451536A (en) * | 2014-12-12 | 2015-03-25 | 西安理工大学 | Method for rapidly boriding Q235 steel |
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| CrN/DLC复合薄膜的制备及其摩擦学性能研究;李福球等;《电镀与涂饰》;20171231;第36卷(第1期);第25-30页 * |
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