CN110656300A - Carburizing process of DC53 steel - Google Patents
Carburizing process of DC53 steel Download PDFInfo
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- CN110656300A CN110656300A CN201910989079.8A CN201910989079A CN110656300A CN 110656300 A CN110656300 A CN 110656300A CN 201910989079 A CN201910989079 A CN 201910989079A CN 110656300 A CN110656300 A CN 110656300A
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- carburizing
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- 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
- C23C8/08—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 only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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- 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
-
- 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
- C23C8/80—After-treatment
Abstract
The invention discloses a carburizing process of DC53 steel, which relates to the technical field of metal material processing, and is characterized in that DC53 steel is placed in an ultrasonic carburizing furnace, the atmosphere is adjusted in a carburizing mode of adding air into a carburizing agent, the carbon concentration of the preset carbon potential is 0.5-1.5%, when the carbon concentration of the actually measured carbon potential is higher than that of the preset carbon potential, air is automatically introduced through an air adjusting valve, when the carbon concentration of the actually measured carbon potential is lower than that of the preset carbon potential, the air adjusting valve stops the introduction of air, the steel is discharged from the furnace in an air cooling mode after the carburizing is finished, and finally, heat treatment is carried out. After the DC53 steel is treated by the carburizing process, the depth of a carburized layer reaches more than 1.7mm, the surface hardness reaches more than 63HRC, and the core hardness reaches more than 45 HRC.
Description
The technical field is as follows:
the invention relates to the technical field of metal material processing, in particular to a carburizing process for DC53 steel.
Background art:
the DC53 steel is a novel cold-work die steel improved from SKD11, the toughness of the DC53 steel is twice that of SKD11, and the defects of insufficient high-temperature tempering hardness and toughness of SKD11 are overcome. The toughness of the DC53 steel is more outstanding in cold-work die steel, so that cracks and chipping rarely occur, and the service life is greatly prolonged.
Carburizing is one kind of surface treatment of metal, and features that carburized low-carbon steel or low-alloy steel is used to make the active carbon atoms decomposed from carburizing medium permeate into the surface layer of steel part to obtain high-carbon surface layer and the core part has the same components as the original components.
In order to further optimize the application performance of the DC53 steel, the DC53 steel can be carburized. Based on the aim, the invention develops a novel DC53 steel carburizing process, the application performance of the DC53 steel treated by the process is obviously improved, the process parameters are clear, and the process is simple and convenient.
The invention content is as follows:
the invention aims to provide a carburizing process for DC53 steel, which is used for optimizing the application performance of DC53 steel and ensuring the repeatability and low cost of the process.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a carburizing process for DC53 steel comprises placing DC53 steel in an ultrasonic carburizing furnace, adjusting atmosphere in a carburizing mode of adding air into a carburizing agent, wherein the carbon concentration of the preset carbon potential is 0.5-1.5%, automatically introducing air through an air adjusting valve when the carbon concentration of the actually measured carbon potential is higher than that of the preset carbon potential, stopping introducing air through the air adjusting valve when the carbon concentration of the actually measured carbon potential is lower than that of the preset carbon potential, discharging the steel from the furnace after carburizing is completed, and finally performing heat treatment.
The ultrasonic frequency of the ultrasonic carburizing furnace is 40KHz, and the ultrasonic power is 1000-.
The carburization is divided into three stages, the carbon concentration of the carbon potential is preset to be 0.6-0.8% in the first stage, the carburization temperature is 950-1000 ℃, and the carburization time is 1-3 h; in the second stage, the carbon concentration of the carbon potential is preset to be 1.3-1.5%, the carburizing temperature is 900-950 ℃, and the carburizing time is 2-5 h; in the third stage, the carbon concentration of the carbon potential is preset to be 0.8-1.2%, the carburizing temperature is 850-900 ℃, and the carburizing time is 2-5 h.
The carburizing agent is ethyl acetate or ethanol.
The flow rate of the carburizing agent is 0.2-0.6L/h.
The heat treatment comprises high-temperature quenching, high-temperature tempering and low-temperature tempering, wherein the high-temperature quenching is carried out for 1-3h at the temperature of 900-950 ℃, the high-temperature tempering is carried out for 1-3h at the temperature of 650-700 ℃, and the low-temperature tempering is carried out for 1-3h at the temperature of 200-250 ℃.
In order to optimize the carburizing effect, the invention also uses an accelerant agent in cooperation with the carburizing agent, and the accelerant agent is sprayed on the surface of the DC53 steel before the carburizing operation is carried out, namely:
the invention also provides another carburizing process of the DC53 steel, which comprises the steps of firstly spraying a penetration enhancer on the surface of the DC53 steel, then placing the DC53 steel in an ultrasonic carburizing furnace, adjusting the atmosphere in a carburizing agent and air adding direct carburizing mode, wherein the carbon concentration of the preset carbon potential is 0.5-1.5%, automatically introducing air through an air adjusting valve when the carbon concentration of the actually measured carbon potential is higher than that of the preset carbon potential, stopping introducing air through the air adjusting valve when the carbon concentration of the actually measured carbon potential is lower than that of the preset carbon potential, air-cooling and discharging the steel after carburizing, and finally performing heat treatment.
The ultrasonic frequency of the ultrasonic carburizing furnace is 40KHz, and the ultrasonic power is 1000-.
The carburization is divided into three stages, the carbon concentration of the carbon potential is preset to be 0.6-0.8% in the first stage, the carburization temperature is 950-1000 ℃, and the carburization time is 1-3 h; in the second stage, the carbon concentration of the carbon potential is preset to be 1.3-1.5%, the carburizing temperature is 900-950 ℃, and the carburizing time is 2-5 h; in the third stage, the carbon concentration of the carbon potential is preset to be 0.8-1.2%, the carburizing temperature is 850-900 ℃, and the carburizing time is 2-5 h.
The carburizing agent is ethyl acetate or ethanol.
The flow rate of the carburizing agent is 0.2-0.6L/h.
The heat treatment comprises high-temperature quenching, high-temperature tempering and low-temperature tempering, wherein the high-temperature quenching is carried out for 1-3h at the temperature of 900-950 ℃, the high-temperature tempering is carried out for 1-3h at the temperature of 650-700 ℃, and the low-temperature tempering is carried out for 1-3h at the temperature of 200-250 ℃.
The accelerant agent is prepared by mixing yttrium nitride with absolute ethyl alcohol, wherein the content of yttrium nitride is 0.05-0.5 wt%, and the dosage of the accelerant agent is per cm2Spraying 0.01-0.5 g.
The carburization speed is accelerated and the carburization effect is further optimized through the matching use of the catalytic agent, the catalytic agent commonly used in the field is a rare earth catalytic agent and a BH catalyst, obviously, yttrium nitride does not belong to the commonly used catalytic agent known in the field, and the novel application of the yttrium nitride as the catalyst is unexpectedly realized through multiple experiments.
The invention has the beneficial effects that: the invention realizes the new application of combining ultrasonic wave and carburizing process, the carburizing process of the DC53 steel is carried out under the action of the ultrasonic wave through the application of the ultrasonic carburizing furnace, the carburizing time is shortened, and the penetration rate is accelerated, so that the carburized layer at each thickness has the same strength; after the DC53 steel is treated by the carburizing process, the depth of a carburized layer reaches more than 1.7mm, the surface hardness reaches more than 63HRC, and the core hardness reaches more than 45 HRC.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
The DC53 steel is placed in an ultrasonic carburizing furnace, the ultrasonic frequency is 40KHz, the ultrasonic power is 1800W, the atmosphere is adjusted in a straight permeation mode of adding air into ethyl acetate, the flow rate of the ethyl acetate is 0.45L/h, air is automatically introduced through an air adjusting valve when the carbon concentration of the actual measured carbon potential is higher than that of the preset carbon potential, and the air introduction is stopped by the air adjusting valve when the carbon concentration of the actual measured carbon potential is lower than that of the preset carbon potential. The carburization is divided into three stages, the first stage is preset with the carbon concentration of the carbon potential at 0.6%, the carburization temperature at 950 ℃ and the carburization time at 2 h; in the second stage, the carbon concentration of carbon potential is preset to be 1.3%, the carburizing temperature is 900 ℃, and the carburizing time is 3 h; in the third stage, the carbon concentration of the carbon potential is preset to be 1%, the carburizing temperature is 850 ℃, the carburizing time is 3 hours, after the carburizing is finished, the furnace is discharged when the air cooling is carried out to 80 ℃, and finally the heat treatment is carried out, wherein the heat treatment comprises high-temperature quenching, high-temperature tempering and low-temperature tempering, the high-temperature quenching is carried out for 2 hours at 950 ℃, the high-temperature tempering is carried out for 2 hours at 700 ℃, and the low-temperature tempering is carried out for 2 hours at 230 ℃.
Example 2
The same procedure as in example 1 was repeated except that the carburizing temperature in example 1 was changed to 950 ℃.
Example 3
The DC53 steel of example 1 is sprayed with accelerant agent before carburization, the accelerant agent is made by mixing yttrium nitride with absolute ethyl alcohol, the content of yttrium nitride is 0.1 wt%, the dosage of accelerant agent is per cm20.02g of spraying agent.
Comparative example
The ultrasonic wave in example 1 was removed, that is, the carburization process was not performed under the ultrasonic wave, and the rest was the same as example 1.
The same batch of DC53 steel, which was obtained from pacific die steel ltd, shenzhen, was carburized using the above examples and comparative examples, respectively, and DC53 steel, which was originally not subjected to any carburizing treatment and heat treatment, was purchased, and a workpiece having a length of 30cm, a width of 30cm and a height of 5cm was formed, and a blank example without carburizing treatment was set, and the depth of carburized layer, the surface hardness and the core hardness were measured, and the measurement results are shown in table 1.
TABLE 1
| Group of | Depth of carburized layer/mm | Surface hardness/HRC | Core hardness/HRC |
| Example 1 | 1.78 | 63.2 | 45.3 |
| Example 2 | 1.80 | 63.3 | 45.3 |
| Example 3 | 2.19 | 64.4 | 47.8 |
| Comparative example | 1.12 | 60.7 | 42.6 |
| Blank example | 0 | 53.8 | 36.4 |
As can be seen from table 1, the present invention can significantly improve the carburizing effect by the combination of the ultrasonic technology and the carburizing process and the combination of the infiltrant and the carburizing agent.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A carburizing process of DC53 steel is characterized in that: the method comprises the steps of placing DC53 steel in an ultrasonic carburizing furnace, adjusting atmosphere in a carburizing agent and air direct carburizing mode, enabling the carbon concentration of a preset carbon potential to be 0.5-1.5%, automatically introducing air through an air adjusting valve when the carbon concentration of the actually measured carbon potential is higher than that of the preset carbon potential, stopping introducing air through the air adjusting valve when the carbon concentration of the actually measured carbon potential is lower than that of the preset carbon potential, air-cooling and discharging after carburizing are finished, and finally performing heat treatment.
2. The carburizing process according to claim 1, characterized in that: the ultrasonic frequency of the ultrasonic carburizing furnace is 40KHz, and the ultrasonic power is 1000-.
3. The carburizing process according to claim 1, characterized in that: the carburization is divided into three stages, the carbon concentration of the carbon potential is preset to be 0.6-0.8% in the first stage, the carburization temperature is 950-1000 ℃, and the carburization time is 1-3 h; in the second stage, the carbon concentration of the carbon potential is preset to be 1.3-1.5%, the carburizing temperature is 900-950 ℃, and the carburizing time is 2-5 h; in the third stage, the carbon concentration of the carbon potential is preset to be 0.8-1.2%, the carburizing temperature is 850-900 ℃, and the carburizing time is 2-5 h.
4. The carburizing process according to claim 1, characterized in that: the carburizing agent is ethyl acetate or ethanol.
5. The carburizing process according to claim 1, characterized in that: the flow rate of the carburizing agent is 0.2-0.6L/h.
6. The carburizing process according to claim 1, characterized in that: the heat treatment comprises high-temperature quenching, high-temperature tempering and low-temperature tempering, wherein the high-temperature quenching is carried out for 1-3h at the temperature of 900-950 ℃, the high-temperature tempering is carried out for 1-3h at the temperature of 650-700 ℃, and the low-temperature tempering is carried out for 1-3h at the temperature of 200-250 ℃.
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| CN201910989079.8A CN110656300B (en) | 2019-10-17 | 2019-10-17 | Carburizing process of DC53 steel |
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Cited By (2)
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| CN112899611A (en) * | 2021-01-19 | 2021-06-04 | 潍坊丰东热处理有限公司 | Heat treatment method and heat treatment tool |
| CN114410933A (en) * | 2022-01-24 | 2022-04-29 | 重庆大学 | Carburized layer depth increasing method based on pre-shot blasting |
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| CN110656300B (en) | 2021-10-01 |
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