CN107931418B - Processing method and application of 1500 MPa-grade gradient performance hot forming part - Google Patents
Processing method and application of 1500 MPa-grade gradient performance hot forming part Download PDFInfo
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- CN107931418B CN107931418B CN201710977181.7A CN201710977181A CN107931418B CN 107931418 B CN107931418 B CN 107931418B CN 201710977181 A CN201710977181 A CN 201710977181A CN 107931418 B CN107931418 B CN 107931418B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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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
Abstract
The invention discloses a processing method and application of a 1500 MPa-grade gradient performance hot forming part, and belongs to the technical field of hot forming parts. The processing method comprises the following steps: blanking blank, selective carbon sealing treatment, carburizing treatment, cooling, hot forming stamping and finishing; the selective carbon sealing treatment is to selectively arrange a carbon sealing covering layer according to the regional distribution requirement of the gradient performance of the hot forming part; the carburizing treatment comprises an activation treatment and a diffusion treatment; wherein, the diffusion treatment adopts 10-12% or 14-16% propane atmosphere, the carburizing temperature is 900-930 ℃, and the time is 0.8-1.2 h; the blank heating temperature in the hot forming stamping is controlled to be 830-850 ℃, and the soaking time is 5-8 min. The method can ensure the performance uniformity of the hot forming parts, does not need to manufacture a die, and realizes the low-cost batch stable production of 1500MPa grade gradient performance hot forming parts.
Description
Technical Field
The invention relates to the technical field of hot forming parts, in particular to a processing method and application of a 1500 MPa-level gradient performance hot forming part.
Background
At present, the hot stamping forming material is mainly made of 22MnB5, and Nb or Mo is added on the basis of the 22MnB5, and the material comprises an aluminum-silicon coating, a nano-zinc coating and a bare plate and is used for manufacturing parts such as automobile bumpers, B columns and the like. In order to meet the difference requirements of variable strength of certain components, such as automobile door B-pillars, at different parts so as to ensure small deformation and improve the impact absorption performance, the development of a gradient performance control technology of a hot forming part becomes a hot research point and a development trend at the front of hot forming.
At present, gradient strength performance of hot forming parts is mainly realized through two ways, namely differentiation of hot stamping blanks, namely laser tailor-welding connection of materials which cannot achieve high strength through metal die quenching and 22MnB5 steel plates. The Tailor Welded Blank (TWB) technology is to tailor weld advanced high-strength and other low-strength steels to realize the regional distribution of performance, but the weld joint in the TWB limits the forming performance of the plate, thereby greatly reducing the complexity of the shape of the part. This technique has the following disadvantages: the technical requirement on laser welding is high, the quality of a welding seam is ensured, otherwise, cracks are easy to appear, and the welding seam can be broken in the collision process, so that the welding quality is reduced, and the safety can not be ensured. Secondly, the energy density in the welding process is large, the molten pool is deep, so that the thickness of a welding seam and the thickness around the welding seam are not as uniform as one-step forming in the welding process, and inconvenience is brought to subsequent processing. Moreover, the laser welding method means an additional process, which inevitably increases the cost.
In the second approach, in the hot forming process, the difference of the heating temperature or the cooling rate of the blank on different parts is controlled, so as to realize the flexible distribution of the diversified organization and the performance of the part. For example, continuous variation of strength can be realized by changing the shape and distribution of cooling water pipes in a stamping die, but the realization method is difficult, only a plurality of automobile structural parts with variable strength can be manufactured, customization of the strength of the structural parts cannot be realized, and the manufacturing cost of the die greatly increases the manufacturing cost of parts.
Disclosure of Invention
The invention provides a processing method of 1500 MPa-grade gradient performance hot forming parts, and solves the technical problems that the performance uniformity of a welding seam cannot be ensured, the cost of a differential hot forming die is high, and the uniform transition of the performance of the hot forming parts cannot be ensured in a laser tailor-welding process.
The invention provides a processing method of a 1500MPa grade gradient performance hot forming part, which comprises the following steps: blanking blank, selective carbon sealing treatment, carburizing treatment, cooling, hot forming stamping and finishing; wherein the content of the first and second substances,
the selective carbon sealing treatment is to selectively arrange a carbon sealing covering layer according to the regional distribution requirement of the gradient performance of the hot forming part;
the carburizing treatment comprises an activation treatment and a diffusion treatment; wherein the temperature of the diffusion treatment is 900-930 ℃, and the propane atmosphere concentration and the carburizing time are selected according to the thickness of the blank: the thickness of the blank plate is less than 1.5mm, 10-12% of propane atmosphere is selected, and the carburizing time is 0.8-1.0 h; the thickness is larger than 1.5mm, 14-16% of propane atmosphere is selected, and the carburizing time is 1.0-1.2 h;
the blank heating temperature in the hot forming stamping is controlled to be 830-850 ℃, and the soaking time is 5-8 min.
Further, the carbon sealing covering layer is selectively arranged, specifically, the carbon sealing covering layer is arranged in a low-strength demand area, and the carbon sealing covering layer is not arranged in a high-strength area.
Further, the carbon sealing covering layer is in the form of any one of coating, adhesive, electroplated copper and electroplated nickel.
Further, the activation treatment adopts 5-15% of hydrogen halide atmosphere, the activation temperature is 700-800 ℃, and the activation time is 10-15 min.
Further, the hydrogen halide is hydrogen chloride.
Further, in the diffusion treatment, the propane atmosphere concentration and the carburizing time are selected according to the thickness of the blank plate, and specifically:
the thickness is not more than 1.0mm and less than 1.5mm, 10-12% of propane atmosphere is selected, and the carburizing time is 0.8-1.0 h;
the thickness is not less than 1.5mm and not more than 2.0mm, 14-16% of propane atmosphere is selected, and the carburizing time is 1.0-1.2 h.
Further, the carburizing treatment adopts a fluidized bed, a carburizing furnace or a continuous carburizing heat treatment furnace; wherein the fluidized bed is vacuumized, and the carburizing furnace or the continuous carburizing heat treatment furnace is protected by nitrogen atmosphere and has the pressure of 500-6500 Pa.
Further, the cooling is performed by using a quenching tank, an oil bath or a sand bath.
Further, the tissue types of the thermoformed part include: a martensite structure or a martensite + bainite structure.
The invention also provides application of the processing method in preparing automobile hot forming parts.
One or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:
the processing method of the 1500MPa grade gradient performance hot forming part provided by the embodiment of the application comprises the following steps: blanking blank, selective carbon sealing treatment, carburizing treatment, cooling, hot forming stamping and finishing; the selective regional carburization is carried out through selective carbon sealing treatment, the carbon content differentiation of different regions of the hot forming part is realized, the differentiation of different tissues is finally realized after hot forming, and the gradient performance is obtained, so that the technical problems that the uniformity of the performance of a welding seam cannot be ensured in a laser tailor-welding process, the cost of a differential hot forming die is high, and the uniform transition of the performance of the hot forming part cannot be ensured are solved, and the low-cost batch stable production of the hot forming part with the tensile strength of 1500MPa grade gradient customization performance is realized.
Drawings
FIG. 1 is a schematic representation of a carbon containment blanket coating for a 1500MPa class thermoformed part of the present application;
FIG. 2 is a schematic representation of a carbon block-out blanket of a flat prototype according to an embodiment of the present application;
FIG. 3 is a room temperature stress-strain curve of a high tensile region of a hot formed part made in accordance with example 1 of the present application;
FIG. 4 is a metallographic structure photograph showing the structure of a high-strength region of a hot-formed part prepared in example 1 of the present application;
FIG. 5 is a metallographic photograph of an uncarbonized region of a thermoformed part made according to comparative example 1 of the present application.
Detailed Description
The embodiment of the application provides a processing method and application of 1500 MPa-level gradient performance hot forming parts, solves the technical problems that the performance uniformity of a welding seam cannot be ensured, the cost of a differential hot forming die is high, and the uniform transition of the performance of the hot forming parts cannot be ensured in a laser tailor-welding process, and realizes the low-cost batch stable production of the 1500 MPa-level gradient customized performance hot forming parts with tensile strength.
In order to solve the above technical problem, the general idea of the embodiment of the present application is as follows:
the application provides a processing method of a 1500 MPa-grade gradient performance hot forming part, which comprises the following steps: blanking blank, selective carbon sealing treatment, carburizing treatment, cooling, hot forming stamping and finishing; wherein the content of the first and second substances,
the selective carbon sealing treatment is to selectively arrange a carbon sealing covering layer according to the regional distribution requirement of the gradient performance of the hot forming part;
the carburizing treatment comprises an activation treatment and a diffusion treatment; wherein the temperature of the diffusion treatment is 900-930 ℃, and the propane atmosphere concentration and the carburizing time are selected according to the thickness of the blank: the thickness of the blank plate is less than 1.5mm, 10-12% of propane atmosphere is selected, and the carburizing time is 0.8-1.0 h; the thickness is larger than 1.5mm, 14-16% of propane atmosphere is selected, and the carburizing time is 1.0-1.2 h;
the blank heating temperature in the hot forming stamping is controlled to be 830-850 ℃, and the soaking time is 5-8 min.
The method can ensure the performance uniformity of the hot forming part, does not need to manufacture a die, and realizes the low-cost batch stable production of the hot forming part with 1500MPa grade gradient performance.
In order to better understand the technical solutions, the technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The embodiment of the application provides a processing method of a 1500 MPa-level gradient performance hot forming part, which comprises the following steps: blanking blank, selective carbon sealing treatment, carburizing treatment, cooling, hot forming stamping and finishing; wherein the content of the first and second substances,
the blank comprises the following chemical components in percentage by weight: c: 0.02-0.06%, Si: 0.001-0.20%, Mn: 0.2-0.5%, P: 0.001-0.02%, S: < 0.015%, Al: 0.02-0.06%, N: less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities.
The selective carbon sealing treatment is to selectively arrange a carbon sealing covering layer according to the regional distribution requirement of the gradient performance of the hot forming part;
specifically, determining a corresponding area according to the gradient customization performance requirement of the hot-formed part to perform carbon sealing, and realizing customized carburization, namely: and arranging a carbon closed covering layer in a low-strength (high-toughness) required area, and not performing special treatment on a high-strength area. The purpose of providing a carbon block-out mask in a particular region is to prevent carbon enrichment of that region during the subsequent carburization process to achieve gradient performance. Wherein, the carbon sealing covering layer can be selected from coating or adhesive, and electroplated copper or nickel. An exemplary schematic of the coating is shown in fig. 1.
The carburization treatment aims at obtaining full-thickness carbon enrichment, is suitable for a fluidized bed, a carburizing furnace or a continuous carburizing heat treatment furnace, and is produced by adopting a vacuum low-pressure carburization process. The carburizing treatment is divided into an activation treatment stage and a diffusion treatment stage, and different target carbon contents are realized by controlling the diffusion treatment time and temperature. Wherein the content of the first and second substances,
the activation treatment adopts 5-15% of hydrogen halide atmosphere, the activation temperature is 700-800 ℃, and the activation time is 10-15 min. The hydrogen halide gas has the function of removing surface oxides and improving the subsequent carburization efficiency. If the concentration exceeds the above range, the activation effect cannot be achieved, i.e. oxides still exist on the surface of the material, the carburization diffusion is inhibited, and the cost is increased due to the excessively high concentration; the temperature and the time are matched to ensure better activation effect. Preferably, a hydrogen chloride atmosphere is preferred in view of low cost production of a hydrogen halide atmosphere.
The diffusion treatment adopts 10-12% or 14-16% propane atmosphere, the carburizing temperature is 900-930 ℃, and the time is 0.8-1.2 h. Propane is the source of carburization, the concentration of which corresponds to the carbon potential; the carburizing temperature and time are key process parameters for ensuring the carburizing concentration of the material. The carbon content of the material with too small carbon potential, too low temperature and too low time can not ensure the stability of the supercooled austenite, namely the supercooled austenite is partially transformed into martensite; over-high temperature and over-long time can cause austenite grains to grow excessively, and the performance of the material is influenced.
Specifically, the diffusion treatment is performed by introducing propane at a certain concentration after activation to obtain a reasonable carbon potential, and the appropriate treatment time and temperature are determined depending on the plate thickness and the target carbon concentration. In order to reduce coarsening of crystal grains, the carburizing treatment temperature is preferably 900-930 ℃, and the treatment atmosphere concentration and the carburizing time are optimized according to the thickness of the blank:
the thickness is not more than 1.0mm and less than 1.5mm, 10-12% of propane atmosphere is selected, and the carburizing time is 0.8-1.0 h;
the thickness is not less than 1.5mm and not more than 2.0mm, 14-16% of propane atmosphere is selected, and the carburizing time is 1.0-1.2 h.
In the specific implementation process, the carburizing treatment is carried out by adopting a fluidized bed, a carburizing furnace or a continuous carburizing heat treatment furnace; wherein the fluidized bed is vacuumized, and the carburizing furnace or the continuous carburizing heat treatment furnace is protected by nitrogen atmosphere and has the pressure of 500-6500 Pa.
Further, after the carburizing treatment, the sample is cooled in a quenching bath, an oil bath, or a sand bath.
The blank heating temperature in the hot forming stamping is controlled to be 830-850 ℃, and the soaking time is 5-8 min.
Specifically, the hot forming stamping and finishing steps are the same as the conventional hot forming stamping process flow, and comprise the following steps: blank → heating furnace heating → shaping → laser cutting → shot blasting. The blank heating temperature is 830-850 ℃, the soaking time is 5-8 min, and the heating temperature is lower than the conventional hot stamping heating temperature, so that the hot forming heating cost and the generation trend of iron scale on the surface of the blank are reduced.
Different tissue differentiation is achieved after thermoforming, namely: in the hot formed part, the high carbon content region is transformed into a martensite structure or a martensite + bainite structure, and the low carbon content region is transformed into a ferrite + pearlite structure. Specifically, the carbon block-out mask layer region is a low carbon content region (low strength/high toughness region), and the carbon block-out mask layer region is not provided as a high carbon content region (high strength region), thereby obtaining a customized gradient property.
According to the processing method of the 1500 MPa-level hot forming part, the conventional hot forming equipment and the low-temperature heating process are adopted, the flexibility of the manufacturing process is controllable, the batch stable production of the 1500 MPa-level gradient customized performance hot forming part with the tensile strength is realized, and the bottlenecks of high manufacturing cost and poor performance stability in the prior art are broken through.
The 1500MPa grade gradient performance hot forming part in the embodiment of the application specifically means that part areas of the part show high strength characteristic and part areas show high plasticity characteristic, and the specific indexes are as follows: the high strength characteristic is that the lower limit value of Rm is 1500 MPa; the high plasticity characteristics are that the lower limit value Rm is 450MPa and the lower limit value of the elongation is 20 percent.
The hot forming part prepared by the processing method of the 1500MPa grade gradient performance hot forming part in the embodiment of the application has the advantages of tissue diversification and performance uniformity. The method is particularly suitable for manufacturing automobile hot forming parts, including but not limited to A columns, B columns, bumpers, reinforcing ribs and other parts.
The present application is described in more detail by way of examples below. These examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
In the embodiment of the application, the blank is a common cold-rolled DC01 material, and the blank comprises the following chemical components in percentage by weight: c: 0.02-0.06%, Si: 0.001-0.20%, Mn: 0.2-0.5%, P: 0.001-0.02%, S: < 0.015%, Al: 0.02-0.06%, N: less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities.
The chemical components of specific examples are shown in table 1. Examples 1-4 and comparative example 1 are B-pillar parts with gradient performance, and examples 5-8 and comparative example 2 are flat plate samples with gradient performance.
TABLE 1 stock chemistry (wt%) of examples and comparative examples
The preparation process flow of the hot forming part with the gradient performance comprises the following steps: blank blanking → selective carbon sealing treatment → carburizing treatment → cooling → hot forming stamping → finishing.
The blank blanking is determined according to the size of the finished product of the hot forming part, the blank pressing size of the process auxiliary surface is reasonably designed, and the part is cut off during the laser trimming of the later part.
After blanking, coating or gluing treatment is carried out on the low-strength required area according to the gradient customized performance requirement so as to prevent carbon enrichment of the area in the subsequent carburizing treatment process. Wherein, the schematic diagram of the selective carbon shielding layer of the flat plate sample piece is shown in figure 2.
The blank was then carburized, with examples 1-4 and comparative example 1 being conducted in a fluidized bed and examples 5-8 and comparative example 2 being conducted in a continuous carburizing heat treatment furnace. The method adopts a vacuum low-pressure carburization process for production and comprises the stages of activation treatment and diffusion treatment. The detailed process steps are as follows:
an activation treatment stage: the fluidized bed is pre-vacuumized, and the continuous carburizing heat treatment furnace is protected by nitrogen atmosphere in the whole process. And then, introducing hydrogen chloride gas with the volume concentration of 10% during the activation treatment, controlling the activation temperature to be 760-780 ℃ and treating for 12 minutes.
And (3) a diffusion treatment stage: and (3) introducing propane after the activation treatment to obtain a reasonable carbon potential, determining proper treatment time and temperature according to the plate thickness and the target carbon concentration, preferably selecting the carburizing temperature of 900-930 ℃ for reducing coarsening of crystal grains, and optimizing the atmosphere concentration and the treatment time according to the plate thickness, wherein the specific process parameters are shown in Table 2.
TABLE 2 carburizing diffusion treatment process conditions
The hot forming stamping and finishing steps are the same as the conventional hot forming stamping process flow, and comprise the following steps: blank → heating furnace heating → shaping → laser cutting → shot blasting. The method has the remarkable advantages that the conventional hot forming equipment and the low-temperature process are adopted to prepare the hot forming part with the gradient customization performance, the blank heating temperature is 830-850 ℃, and is lower than the conventional hot stamping heating temperature, so that the hot forming heating cost and the generation trend of the iron scale on the surface of the blank are reduced. Examples detailed thermoforming process parameters are shown in table 3, with examples 1-4 and comparative example 1 using B-pillar die cooling and examples 5-8 and comparative example 2 using flat die cooling.
TABLE 3 thermoforming Process parameters
And (4) analyzing results: the hot-formed parts prepared in the examples were sampled at different positions, and the room temperature stress-strain curves of the typical samples are shown in fig. 3, the high strength zone structure photograph thereof is shown in fig. 4, the high plasticity zone (low strength zone) metallographic structure thereof is shown in fig. 5, and the room temperature tensile test results are shown in table 4. The test result shows that the tensile strength of the high-strength area of the sample piece of the embodiment reaches 1500MPa, and the structure is a lath-shaped martensite structure. Because the technological parameters of the comparative example are beyond the range of the application, the carbon content of the carburized area is lower than that of the sample of the example, the martensite phase transformation occurs in the hot forming cooling process, but the tensile strength is lower than 1500 MPa; the metallographic structure of the non-carburized area is ferrite plus pearlite, and the tensile strength is 480 MPa.
TABLE 4 mechanical properties at room temperature in carburized region of hot-formed part
In summary, the embodiment of the application realizes the tissue differentiation of different areas of the hot-formed part by the selective area carburization technology, and can realize the preparation of the hot-formed part with the tensile strength of 1500MPa grade gradient customization performance by controlling the process conditions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A processing method of 1500MPa grade gradient performance hot forming parts is characterized by comprising the following steps: blanking blank, selective carbon sealing treatment, carburizing treatment, cooling, hot forming stamping and finishing; wherein the content of the first and second substances,
the selective carbon sealing treatment is to selectively arrange a carbon sealing covering layer according to the regional distribution requirement of the gradient performance of the hot forming part; the carbon sealing covering layer is selectively arranged, specifically, the carbon sealing covering layer is arranged in a low-strength demand area, the carbon sealing covering layer is not arranged in a high-strength area, and the carbon sealing covering layer is in any one of a coating, viscose, electroplated copper and electroplated nickel;
the carburizing treatment comprises an activation treatment and a diffusion treatment; wherein the temperature of the diffusion treatment is 900-930 ℃, and the propane atmosphere concentration and the carburizing time are selected according to the thickness of the blank: the thickness of the blank plate is less than 1.5mm, 10-12% of propane atmosphere is selected, and the carburizing time is 0.8-1.0 h; the thickness is larger than 1.5mm, 14-16% of propane atmosphere is selected, and the carburizing time is 1.0-1.2 h; the blank heating temperature in the hot forming stamping is controlled to be 830-850 ℃, and the soaking time is 5-8 min.
2. The method for processing the hot forming part with 1500MPa grade gradient performance as claimed in claim 1, wherein the activating treatment adopts 5-15% hydrogen halide atmosphere, the activating temperature is 700-800 ℃, and the activating time is 10-15 min.
3. The method of processing a 1500MPa grade gradient performance thermoformed part of claim 2, wherein the hydrogen halide is hydrogen chloride.
4. The method for processing the hot-formed part with the 1500 MPa-level gradient performance according to claim 1, wherein the diffusion treatment selects the propane atmosphere concentration and the carburizing time according to the thickness of the blank plate, and specifically comprises the following steps: the thickness is not more than 1.0mm and less than 1.5mm, 10-12% of propane atmosphere is selected, and the carburizing time is 0.8-1.0 h; the thickness is not less than 1.5mm and not more than 2.0mm, 14-16% of propane atmosphere is selected, and the carburizing time is 1.0-1.2 h.
5. The method for processing the hot-formed part with the 1500MPa grade gradient performance as claimed in claim 1, wherein the carburizing treatment adopts a fluidized bed or a carburizing furnace; wherein the fluidized bed is vacuumized, the carburizing furnace is protected by nitrogen atmosphere, and the pressure is 500-6500 Pa.
6. The method for processing the hot-formed part with the 1500MPa grade gradient performance as claimed in claim 1, wherein the carburizing treatment adopts a continuous carburizing heat treatment furnace; wherein the continuous carburizing heat treatment furnace is protected by a nitrogen atmosphere, and the pressure is 500-6500 Pa.
7. The method of processing a hot-formed part with 1500MPa grade gradient performance of claim 1, wherein the cooling is performed by quenching bath, oil bath or sand bath cooling.
8. The method of manufacturing a hot-formed part with a gradient performance of 1500MPa according to any one of claims 1 to 7, wherein the type of structure of the hot-formed part comprises: a martensite structure or a martensite + bainite structure.
9. Use of a process according to any one of claims 1 to 8 for the production of hot-formed parts for automobiles.
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