CN115537716A - 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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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 238000005271 boronizing Methods 0.000 claims abstract description 62
- 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 17
- 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
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000011049 filling 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 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
- 238000000576 coating method Methods 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 238000000151 deposition Methods 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 9
- 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 5
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 5
- 238000002360 preparation method 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
- 239000000843 powder Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000005552 hardfacing Methods 0.000 claims 1
- 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
- 230000007704 transition Effects 0.000 description 9
- 239000000758 substrate Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 230000008093 supporting effect Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 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
- 239000011159 matrix material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid 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
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004075 alteration 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
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- 238000011056 performance test Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 231100000241 scar Toxicity 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
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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 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 a GH4169 steel die and a product thereof, wherein the processing method comprises the following steps: s1) putting the pretreated workpiece into a heat-resistant tank, and then filling a boronizing agent to ensure that the workpiece to be processed is filled with the boronizing agent and compacted; s2) putting the heat-resistant tank into a box type electric heating furnace, heating to 850-880 ℃, and keeping the temperature for 4-8h; s3) discharging the workpiece from the heat-resistant tank, standing still 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 and 5-10 w% of potassium fluoboratet%, 5-8wt% of active carbon and the balance of silicon carbide. FeB phase and Fe are formed on the surface of the workpiece after boronizing treatment 2 The borides formed by the B phase are all high-hardness phases and have stable chemical properties, so that the boriding 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 a GH4169 steel die and a product thereof.
Background
GH4169 alloy steel is a Ni-Cr-Fe-based aging-strengthened high-temperature alloy, has high strength and oxidation resistance within the working temperature range, has high hot workability, welding performance and long-term structure stability, and also has high ductility, 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 made of GH4169 alloy instead of H13 steel. Compared with an H13 steel nitriding die, 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 processing 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 provide an article using the method for surface hardening of GH4169 steel molds, which comprises a gradient transition layer consisting of a boronized layer + a Cr layer + a CrN layer, and a DLC film.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing method for surface hardening of GH4169 steel dies comprises the following steps:
s1) putting the pretreated workpiece into a heat-resistant tank, and then filling a boronizing agent to ensure that the workpiece to be processed is filled with the boronizing agent and compacted;
s2) putting 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 from the heat-resistant tank, standing still 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) depositing a Cr layer on the boronized workpiece with the cleaned surface by adopting a plasma coating process, and then depositing a CrN layer to obtain a hardened workpiece;
s5) putting the hardened workpiece with the cleaned surface into a magnetron sputtering coating machine, and vacuumizing to 5X10 -3 And after Pa, filling argon to 0.5-1Pa, sputtering the surface of the hardened workpiece at the 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 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.
Preferably, the particle size of the boron carbide is 40-50 μm; the particle size of the active carbon is 150-300 μm; the grain diameter of the silicon carbide is 120-180 mu m.
Preferably, the particle size of the boronizing agent is 0.5-1mm, and the thickness of the boronizing layer of the boronizing workpiece is more than 10 microns.
Further, the preparation of the boronizing agent comprises the following steps:
and weighing boron carbide, ferroboron, potassium fluoborate, activated carbon and silicon carbide according to the proportion, putting the mixture into a powder mixer, mixing and stirring the mixture, and drying the prepared mixture particles to obtain the boronizing agent.
Preferably, the mixing time is 4-8h, and the drying temperature is 80-90 ℃.
Furthermore, the invention provides a GH4169 steel die which is prepared by 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 surface hardening of the GH4169 steel die, the adopted boronizing agent can be carried out 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 layer reaches HV1200 or more; the boronizing agent is suitable for a solid boronizing process, so that the processing process is easy to operate, and the economic advantage is obvious; and the boronizing layer has high forming speed and moderate cost, and is suitable for popularization.
Furthermore, the GH4169 steel die is prepared by adopting the processing method for surface hardening of the GH4169 steel die, and the surface coating of the GH4169 steel die 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 DLC film and the gradient transition layer, and the bonding force between the surface coating and a substrate can be enhanced.
Drawings
FIG. 1 is a metallographic structure diagram of example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
A processing method for surface hardening of GH4169 steel dies comprises the following steps:
s1) putting the pretreated workpiece into a heat-resistant tank, and then filling a boronizing agent to ensure that the workpiece to be processed is filled with the boronizing agent and compacted;
s2) putting 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 from the heat-resistant tank, standing still 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 surface hardening of the GH4169 steel die, the adopted boronizing agent can be carried out 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 layer reaches HV 1200; the boronizing agent is suitable for a solid boronizing process, so that the processing process is easy to operate, and the economic advantage is obvious; and the boronizing layer has high forming speed and moderate cost, and is suitable for popularization.
Boron carbide in the boronizing agent is a main boron source, ferroboron is used as a supplement, and potassium fluoborate is used as an activating agent, so that a better cementation layer can be formed. FeB phase and Fe are formed on the surface of the workpiece after boronizing treatment 2 The boride formed by the B phase 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) depositing a Cr layer on the boronized workpiece with the cleaned surface by adopting a plasma coating process, and then depositing a CrN layer to obtain a hardened workpiece;
s5) putting the hardened workpiece with the cleaned surface into a magnetron sputtering coating machine, and vacuumizing to 5X10 -3 And after Pa, filling argon to 0.5-1Pa, sputtering the surface of the hardened workpiece at the 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 by boronizing, hardening and magnetron sputtering forms a composite diffusion coating, the structure of the composite diffusion coating is uniform, the combination with a matrix is good, the surface is smooth and flat, the wear resistance and the anti-sticking property of the die can be greatly improved, and the service life of the die is obviously prolonged.
The anode layer flow ion source is adopted for assisting deposition, so that the diffusion capacity of atoms is improved, crystal grains in a gradient transition layer consisting of the boronizing layer, the Cr layer and the CrN layer grow epitaxially to form a uniform columnar crystal structure, the crystal grains are fine, the internal defects are few, and the strength is higher.
Preferably, 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.
A gradient transition layer consisting of the boronizing layer, the Cr layer and the CrN layer is established, so that the mutual diffusion of elements among the film layers is facilitated, a structure similar to mechanical locking is formed, a better supporting effect is formed among the elements, and the binding force among the film layers can be enhanced. When a load is applied externally, the generation of plastic deformation can be effectively weakened, and the bonding force between the DLC film and the substrate is enhanced.
Preferably, the particle size of the boron carbide is 40-50 μm; the particle size of the active carbon is 150-300 μm; the grain diameter of the silicon carbide is 120-180 mu m.
The particle sizes of the boron carbide, the active carbon and the silicon carbide in the raw materials are controlled to be in the range, so that the performance of a boronizing layer is ensured, and a higher boronizing treatment speed is obtained.
Preferably, the particle diameter of the boronizing agent is 0.5-1mm, and the thickness of the boronizing layer of the boronizing workpiece is more than 10 microns.
The particle size of the boronizing agent is preferably 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 boronizing agent comprises the following steps:
weighing boron carbide, ferroboron, potassium fluoborate, activated carbon and silicon carbide according to a proportion, putting the mixture into a powder mixer, mixing and stirring the mixture, and drying the prepared mixture particles to obtain the boronizing agent.
Preferably, the mixing time is 4-8h, and the drying temperature is 80-90 ℃.
The boronizing agent can be prepared by simple mixing and drying processes, and has good cost and production efficiency.
Furthermore, the invention provides a GH4169 steel die which is prepared by the processing method for surface hardening of the GH4169 steel die.
The surface coating of the prepared GH4169 steel die 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, and a supporting effect is formed between the DLC film and the gradient transition layer, so that the binding force between the surface coating and a substrate can be enhanced.
Examples 1 to 3 and comparative examples 1 to 3
1. The preparation method comprises the following steps of taking GH4169 die steel as a base body, and preparing boronized workpieces of various embodiments and various proportions according to the raw material proportion and the process parameters listed in the table 1:
s1) putting the pretreated workpiece into a heat-resistant tank, and then filling a boronizing agent to ensure that the workpiece to be processed is filled with the boronizing agent and compacted;
s2) putting the heat-resistant tank into a box-type electric heating furnace, heating to 850-880 ℃, and keeping the temperature for 4-8 hours;
and S3) discharging the workpiece from the heat-resistant tank, standing still and air-cooling to room temperature to obtain the boronized workpiece.
2. Analyzing the boronizing layer of the boronizing workpiece by adopting a Zeiss Supra 40 type field emission scanning electron microscope, observing whether the metallographic structure of the boronizing layer has bad defects, and simultaneously measuring the thickness of the boronizing layer, wherein the detection result is shown in a table 1.
3. The Vickers hardness of the infiltrated layer was measured using MH-500D type microhardness meter, and the 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 shown in Table 1, the boronized layers of examples 1-3 have satisfactory thickness and hardness, and uniform metallographic structure, and the metallographic structure of example 1 is shown in FIG. 1, in which the white parts in the form of comb teeth are the boronized layers.
4. The boronized workpiece from example 2 was used to prepare the DLC coating of example 2 according to the following steps:
s4) depositing a Cr layer on the boronized workpiece with the cleaned surface by adopting a plasma coating process, and then depositing a CrN layer to obtain a hardened workpiece;
s5) putting the hardened workpiece with the cleaned surface into a magnetron sputtering coating machine, and vacuumizing to 5X10 -3 And after Pa, introducing argon to 0.5Pa, sputtering the surface of the hardened workpiece by using bias voltage of 1000V, and simultaneously starting an anode laminar ion source to deposit a DLC film on the surface of the hardened workpiece, thereby obtaining the DLC coating film of the embodiment 2.
5 the coating thickness of the nitrided H13 die steel substrate and the coating with DLC coating on the surface of the example 2 was measured by Zeiss Supra 40 type field emission scanning electron microscope, and the detection results are shown in Table 2.
6. The Vickers hardness of the surfaces of the GH4169 mold steel base, the nitrided H13 mold steel base, and example 2 having a DLC coating film on the surface was measured using a MH-500D type microhardness tester, and the results of the measurements are shown in Table 2.
7. A scratch wear test is carried out by adopting an MS-T3000 type friction wear tester, and the friction coefficient and the wear scar width of the coatings of GH4169 die steel matrix, nitriding H13 die steel matrix and the embodiment 2 with DLC coating on the surface are detected under the same test conditions, and the detection results are shown in Table 2.
TABLE 2 Performance test results of die steels of example 2 having DLC coating film on surface and the prior art
In conclusion, the surface coating of the GH4169 steel die prepared by the processing method for surface hardening of the GH4169 steel die provided by the invention 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, and a supporting effect is formed between the DLC film and the gradient transition layer, so that the bonding force between the surface coating and a substrate can be enhanced.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. A processing method for surface hardening of GH4169 steel dies is characterized by comprising the following steps:
s1) putting the pretreated workpiece into a heat-resistant tank, and then filling a boronizing agent to ensure that the workpiece to be processed is filled with the boronizing agent and compacted;
s2) putting 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 from the heat-resistant tank, standing still 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.
2. The process for the case hardening of GH4169 steel molds of claim 1, further comprising the steps of:
s4) depositing a Cr layer on the boronized workpiece with the cleaned surface by adopting a plasma coating process, and then depositing a CrN layer to obtain a hardened workpiece;
s5) putting the hardened workpiece with the cleaned surface into a magnetron sputtering coating machine, and vacuumizing to 5X10 -3 And after Pa, filling argon to 0.5-1Pa, sputtering the surface of the hardened workpiece at the 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.
3. The process for the surface hardening of GH4169 steel molds according to claim 2, characterized in that in step S5), the furnace pressure is 0.5Pa, the argon flow is 100ml/min, the acetylene flow is 60ml/min, the bias is 100V, the deposition temperature is 200 ℃ and the deposition time is 2-4h.
4. The process for the hardfacing of GH4169 steel molds according to claim 1, wherein the boron carbide has a particle size of 40-50 μ ι η; the particle size of the active carbon is 150-300 μm; the grain diameter of the silicon carbide is 120-180 mu m.
5. The process of claim 1 for the case hardening of GH4169 steel molds, wherein the particle size of the boronizing agent is 0.5-1mm and the thickness of the boronizing layer of the boronizing work piece is greater than 10 μm.
6. The process for the case hardening of GH4169 steel molds as claimed in claim 1, wherein the preparation of said boronizing agent comprises the following steps:
weighing boron carbide, ferroboron, potassium fluoborate, activated carbon and silicon carbide according to a proportion, putting the mixture into a powder mixer, mixing and stirring the mixture, and drying the prepared mixture particles to obtain the boronizing agent.
7. The process of claim 6 for the case hardening of GH4169 steel molds wherein the mixing time is 4-8h and the drying temperature is 80-90 ℃.
8. A GH4169 steel mould by a process for case hardening of GH4169 steel moulds according to any of claims 2-7.
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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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| Title |
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| 李福球等: "CrN/DLC复合薄膜的制备及其摩擦学性能研究", 《电镀与涂饰》, vol. 36, no. 1, 31 December 2017 (2017-12-31), pages 25 - 30 * |
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