CN111411210A - Multi-angle grain boundary pure iron material and preparation method thereof - Google Patents
Multi-angle grain boundary pure iron material and preparation method thereof Download PDFInfo
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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
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- C—CHEMISTRY; METALLURGY
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- 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
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
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Abstract
The invention belongs to the technical field of metal materials, and particularly relates to a multi-angle grain boundary pure iron material and a preparation method thereof. The invention provides a preparation method of a multi-angle grain boundary pure iron material, which comprises the following steps: sequentially carrying out pretreatment, plastic deformation treatment and stress relief treatment on the as-cast pure iron bar to obtain a primary pure iron material; the surface roughness of the primary pure iron material is less than or equal to 0.8 mu m, and the transverse strain rate of the obtained material after plastic deformation treatment is more than or equal to 30 percent; and sequentially carrying out two-dimensional extension deformation treatment and quenching treatment on the primary pure iron material to obtain the multi-angle grain boundary pure iron material. The preparation method provided by the invention is beneficial to simultaneously improving the strength, hardness and plasticity of the pure iron material. Experimental results show that the multi-angle grain boundary pure iron material obtained by the method provided by the invention has the hardness of 36.2HRC and the tensile strength of 855MPa,elongation up to 49.3%, and fracture toughness up to 48.9 MPa.m1/2。
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a multi-angle grain boundary pure iron material and a preparation method thereof.
Background
The pure iron material has excellent ductility and plasticity and is easy to forge and weld. But the pure iron material is limited by the intrinsic structure of the cast pure iron material, has lower strength and hardness performance, and is difficult to popularize and apply.
The existing pure iron performance strengthening methods (such as microalloy chemical single plastic deformation heat treatment) are difficult to effectively coordinate the relationship between the strength (or hardness) and the plasticity of a pure iron material, mainly because of the regulation limitation of a microstructure, wherein microalloying reduces the plasticity of the material due to excessive alloy strengthening and dispersion strengthening effects and does not accord with the materialization thought of the material; single plastic deformation heat treatment has limited tissue conditioning and general effect.
In short, the effect of optimizing the microstructure of the pure iron material in the prior art is not good enough, and the strength, hardness and plasticity of the pure iron material cannot be improved at the same time.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a multi-angle grain boundary pure iron material, wherein the multi-angle grain boundary pure iron material obtained by the preparation method provided by the present invention has the characteristics of high strength and hardness and excellent plasticity; the invention also provides a multi-angle grain boundary pure iron material.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
the invention provides a preparation method of a multi-angle grain boundary pure iron material, which comprises the following steps:
sequentially carrying out pretreatment, plastic deformation treatment and stress relief treatment on the as-cast pure iron bar to obtain a primary pure iron material; the surface roughness of the primary pure iron material is less than or equal to 0.8 mu m, and the transverse strain rate of the obtained material after plastic deformation treatment is more than or equal to 30 percent;
and sequentially carrying out two-dimensional extension deformation treatment and quenching treatment on the primary pure iron material to obtain the multi-angle grain boundary pure iron material.
Preferably, the pretreatment includes a rust removing treatment and an oxidation preventing treatment which are sequentially performed.
Preferably, the rust removing treatment is high-energy particle beam bombardment; in the high-energy particle beam bombardment, the particle source is carbon monoxide plasma, the power supply power is 2.6-4.3 kW, and the time is 12-18 min.
Preferably, the anti-oxidation treatment is baking treatment; in the baking treatment, the baking steam is potassium hydroxide steam, the steam temperature is 710-790 ℃, and the baking time is 6-11 min.
Preferably, the equipment for plastic deformation treatment and stress relief treatment is a bidirectional high-pressure torsion and induction recovery system; the conditions of the rapid plastic deformation treatment and the stress relief treatment comprise: the torsion force is 800-1240 MPa, the reverse torsion period is 36-67 s, the torsion speed is 7-12 rpm, the induction heating temperature is 780-860 ℃, the single heating time is 6-11 s, the heating interval time is 2-4 s, and the heating times are 12-17.
Preferably, the two-dimensional extension deformation treatment is a micro-curved surface forging hammer; the conditions of the two-dimensional deformation process include: the effective hammering force is 320-410 MPa, and the hammering times at the same position are 3-6.
Preferably, the quenching treatment is double-spray quenching; the quenching treatment conditions include: the quenching temperature is 760-910 ℃, the quenching medium is deionized water, and the quenching medium is 65-75 ℃.
The invention also provides the multi-angle grain boundary pure iron material prepared by the preparation method of the technical scheme.
Preferably, the hardness of the multi-angle grain boundary pure iron material is more than or equal to 33HRC, the tensile strength is more than or equal to 830MPa, the elongation is more than or equal to 47%, and the fracture toughness is more than or equal to 47.5 MPa.m1/2。
The invention provides a preparation method of a multi-angle grain boundary pure iron material, which comprises the following steps: sequentially carrying out pretreatment, plastic deformation treatment and stress relief treatment on the as-cast pure iron bar to obtain a primary pure iron material; the surface roughness of the primary pure iron material is less than or equal to 0.8 mu m, and the transverse strain rate of the obtained material after plastic deformation treatment is more than or equal to 30 percent; and sequentially carrying out two-dimensional extension deformation treatment and quenching treatment on the primary pure iron material to obtain the multi-angle grain boundary pure iron material. The plastic deformation and stress removal treatment is beneficial to effective refinement of pure iron grains and initial adjustment of grain boundaries, and high-energy grain boundaries are manufactured; the two-dimensional extension deformation treatment is used for low-energy treatment of high-energy grain boundaries, and is favorable for preventing residual internal stress generated by subsequent rapid quenching treatment; the quenching treatment is beneficial to storing the regulation and control results of the crystal grains and the crystal boundaries in the early stage, and martensite or bainite transformation is not generated unlike carbon steel, so that the mechanical property of the pure iron material can be obviously improved; meanwhile, the complete pure iron material preparation process is formed by sequentially carrying out pretreatment, plastic deformation and stress relief treatment, two-dimensional extension deformation treatment and quenching treatment, has the characteristics of high component control precision and strong process stability and repeatability, is favorable for realizing a multi-angle grain boundary structure of the pure iron material, and is favorable for simultaneously improving the strength, hardness and plasticity of the pure iron material.
Experimental results show that the multi-angle grain boundary pure iron material obtained by the method provided by the invention has the hardness of 34-36.2 HRC, the tensile strength of 835-855 MPa, the elongation of 48-49.3% and the fracture toughness of 47.5-48.9 MPa-m1 /2。
Detailed Description
The invention provides a preparation method of a multi-angle grain boundary pure iron material, which comprises the following steps:
sequentially carrying out pretreatment, plastic deformation treatment and stress relief treatment on the as-cast pure iron bar to obtain a primary pure iron material; the surface roughness of the primary pure iron material is less than or equal to 0.8 mu m, and the transverse strain rate of the obtained material after plastic deformation treatment is more than or equal to 30 percent;
and sequentially carrying out two-dimensional extension deformation treatment and quenching treatment on the primary pure iron material to obtain the multi-angle grain boundary pure iron material.
The method comprises the step of sequentially carrying out pretreatment, plastic deformation treatment and stress relief treatment on an as-cast pure iron bar to obtain a primary pure iron material.
The method for obtaining the as-cast pure iron bar stock is not particularly limited, and the method for obtaining the as-cast pure iron bar stock, which is well known by the technical personnel in the field, is adopted, and specifically, the method is purchased in the market or prepared independently; the preparation process is not particularly limited in the invention, and the preparation method of the cast pure iron bar stock well known to those skilled in the art can be adopted. The size of the as-cast pure iron bar stock is not particularly limited in the present invention, and may be the size of the as-cast pure iron bar stock known to those skilled in the art.
In the present invention, the pretreatment preferably includes a rust removing treatment and an oxidation preventing treatment which are sequentially performed. The pretreatment equipment is preferably a spraying and baking integrated device. In the present invention, the rust removing treatment is preferably high energy particle beam bombardment. In the present invention, the high-energy particle beam bombardment is performed, and the particle source is preferably carbon monoxide plasma; the power of the power supply is preferably 2.6-4.3 kW, and more preferably 2.9-4.0 kW; the time is preferably 12 to 18min, and more preferably 13 to 17 min. The method is beneficial to cleaning the surface of the pure iron bar and keeping low surface roughness through the derusting treatment.
In the present invention, the oxidation preventing treatment is preferably a baking treatment. In the present invention, in the baking treatment, the baking steam is preferably potassium hydroxide steam; the steam temperature is preferably 710-790 ℃, and more preferably 730-770 ℃; the baking time is preferably 6-11 min, and more preferably 7-10 min. The invention is beneficial to relieving the surface oxidation in the subsequent plastic deformation and induction heating process through the anti-oxidation treatment, and ensures the purity of the pure iron material.
In the present invention, the equipment for plastic deformation treatment and stress relief treatment is preferably a bidirectional high-pressure torsion and induction recovery system. In the invention, the torsion force in the plastic deformation treatment and the stress relief treatment is preferably 800-1240 MPa, and more preferably 850-1200 MPa; the reverse torsion period is preferably 36-67 s, and more preferably 40-60 s; the torsion rate is preferably 7-12 rpm, more preferably 7-10 rpm; the induction heating temperature is preferably 780-860 ℃, and more preferably 800-840 ℃; the single heating time is preferably 6-11 s, and more preferably 7-10 s; the heating interval time is preferably 2-4 s, and more preferably 2s, 3s or 4 s; the number of heating is preferably 12 to 17, more preferably 13 to 16. The invention carries out rapid plastic deformation and stress treatment, is beneficial to effective refinement of crystal grains and initial adjustment of crystal boundaries and manufacturing high-energy crystal boundaries.
After the primary pure iron material is obtained, the invention sequentially carries out two-dimensional extension deformation treatment and quenching treatment on the primary pure iron material to obtain the multi-angle grain boundary pure iron material.
In the present invention, the two-dimensional deformation treatment is preferably a micro-curved surface forging hammer. In the invention, the effective hammering force in the two-dimensional extension deformation treatment is preferably 320-410 MPa, and more preferably 350-380 MPa; the number of hammering at the same position is preferably 3 to 6, and more preferably 4 to 5. The two-dimensional extension deformation treatment is used for low-energy treatment of high-energy grain boundaries, and is favorable for preventing residual internal stress generated by subsequent quenching treatment.
In the present invention, the quenching treatment is preferably a double-spray quenching method. In the invention, the quenching temperature in the quenching treatment is preferably 760-910 ℃, and more preferably 780-890 ℃. In the present invention, the quenching medium is preferably deionized water; the temperature of the quenching medium is preferably 65-75 ℃, and more preferably 65-70 ℃. The quenching treatment of the invention is beneficial to storing the regulation and control results of crystal grains and crystal boundaries in the early stage, does not generate martensite or bainite phase transformation like carbon steel, and is beneficial to improving the mechanical property and hardness of pure iron materials.
The invention also provides the multi-angle grain boundary pure iron material prepared by the preparation method of the technical scheme.
In the invention, the hardness of the multi-angle grain boundary pure iron material is more than or equal to 33HRC, the tensile strength is more than or equal to 830MPa, the elongation is more than or equal to 47%, and the fracture toughness is more than or equal to 47.5 MPa.m1/2。
In order to further illustrate the present invention, the following examples are provided to describe the multi-angle grain boundary pure iron material and the preparation method thereof in detail, but they should not be construed as limiting the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power of a power supply is 2.6 kilowatts, and the derusting treatment time is 12 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 710 ℃, and the time is 6min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-voltage torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 800MPa, the reverse torsion period is 36s, the torsion rate is 7rpm, the induction heating temperature is 780 ℃, the single heating time is 6s, and the interval time between two times of heating is 2s, so as to obtain a blank; and (3) performing two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 320MPa, hammering at the same position for 3 times, and finally completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
Example 2
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power of a power supply is 2.8 kilowatts, and the derusting treatment time is 18 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 720 ℃, and the time is 8min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 840MPa, the reverse torsion period is 37s, the torsion rate is 7rpm, the induction heating temperature is 790 ℃, the single heating time is 7s, and the two-time heating interval time is 2s to obtain a blank; and (3) carrying out two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 340MPa, wherein the hammering times at the same position are 4 times, and finally, completing quenching treatment in 65 ℃ deionized water by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
Example 3
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power of a power supply is 2.9 kilowatts, and the derusting treatment time is 17 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 730 ℃, and the time is 9min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 940MPa, the reverse torsion period is 45s, the torsion rate is 7rpm, the induction heating temperature is 790 ℃, the single heating time is 11s, and the interval time between two times of heating is 2s, so as to obtain a blank; and (3) carrying out two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 320MPa, wherein the hammering times at the same position are 6 times, and finally, completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
Example 4
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power supply is 4.3 kilowatts, and the derusting treatment time is 16 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 790 ℃, and the time is 10min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 1240MPa, the reverse torsion period is 67s, the torsion rate is 7rpm, the induction heating temperature is 860 ℃, the single heating time is 11s, and the time interval between two times of heating is 4s, so as to obtain a blank; and (3) carrying out two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 410MPa, wherein the hammering times at the same position are 6 times, and finally, completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
The multi-angle grain boundary pure iron materials obtained in examples 1 to 4 were subjected to performance tests, and the test standards and test results are shown in table 1.
TABLE 1 Performance test results of the multi-angle grain boundary pure iron materials obtained in examples 1 to 4
As can be seen from Table 1, the Rockwell hardness of the multi-angle grain boundary pure iron material obtained by the preparation method provided by the invention reaches 34-35.2 HRC, the tensile strength reaches 835-845 MPa, the elongation reaches 48-49%, and the fracture toughness reaches 47.5-48.2 MPa.m1 /2And has good hardness, strength and plasticity.
Example 5
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power supply is 4.1 kilowatts, and the derusting treatment time is 15 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 790 ℃, and the time is 7min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 1140MPa, the reverse torsion period is 57s, the torsion rate is 7rpm, the induction heating temperature is 860 ℃, the single heating time is 9s, and the two-time heating interval time is 4s, so as to obtain a blank; and (3) carrying out two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 410MPa, wherein the hammering times at the same position are 5 times, and finally, completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
Example 6
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power supply is 4.3 kilowatts, and the derusting treatment time is 14 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 740 ℃, and the time is 8min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-voltage torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 1040MPa, the reverse torsion period is 47s, the torsion rate is 7rpm, the induction heating temperature is 860 ℃, the single heating time is 8s, and the time interval between two times of heating is 4s, so as to obtain a blank; and (3) performing two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 410MPa, hammering at the same position for 3 times, and finally completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
Example 7
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power of a power supply is 3.3 kilowatts, and the derusting treatment time is 16 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 770 ℃, and the time is 11min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 940MPa, the reverse torsion period is 67s, the torsion rate is 7rpm, the induction heating temperature is 780 ℃, the single heating time is 6s, and the interval time between two times of heating is 2s, so as to obtain a blank; and (3) carrying out two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 370MPa, wherein the hammering times at the same position are 4 times, and finally, completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
Example 8
Sequentially carrying out derusting treatment and anti-oxidation treatment on the as-cast pure iron bar in a spraying and baking integrated device, wherein a particle source in the derusting treatment is carbon monoxide plasma, the power of a power supply is 3.6 kilowatts, and the derusting treatment time is 13 min; baking steam in the anti-oxidation treatment is potassium hydroxide steam, the temperature is 745 ℃, and the time is 8min, so as to obtain a primary pure iron material;
placing the obtained primary pure iron material in a bidirectional high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment, wherein the torsion force is 870MPa, the reverse torsion period is 44s, the torsion rate is 7rpm, the induction heating temperature is 790 ℃, the single heating time is 9s, and the interval time between two times of heating is 2s, so as to obtain a blank; and (3) performing two-dimensional extension deformation treatment on the obtained blank by adopting a micro-curved surface forging hammer under the hammering force of 320MPa, hammering at the same position for 3 times, and finally completing quenching treatment in deionized water at 65 ℃ by adopting double-spray quenching to obtain the multi-angle grain boundary pure iron material.
The multi-angle grain boundary pure iron materials obtained in examples 5 to 8 were subjected to performance tests, and the test standards and test results are shown in table 2.
Table 2 Performance test results of the multi-angle grain boundary pure iron materials obtained in examples 5 to 8
From Table 2Therefore, the Rockwell hardness of the multi-angle grain boundary pure iron material obtained by the preparation method provided by the invention reaches 34.3-36.2 HRC, the tensile strength reaches 837-855 MPa, the elongation reaches 48.2-49.3%, and the fracture toughness reaches 47.7-48.9 MPa.m1/2And has good hardness, strength and plasticity.
As can be seen from the above examples, the Rockwell hardness of the multi-angle grain boundary pure iron material obtained by the preparation method provided by the invention can reach 36.2HRC at most, the tensile strength can reach 855MPa at most, the elongation can reach 49.3 at most, and the fracture toughness can reach 48.9 MPa.m at most1/2And the high-hardness and high-plasticity steel has high hardness, strength and plasticity and great application value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The preparation method of the multi-angle grain boundary pure iron material is characterized by comprising the following steps of:
sequentially carrying out pretreatment, plastic deformation treatment and stress relief treatment on the as-cast pure iron bar to obtain a primary pure iron material; the surface roughness of the primary pure iron material is less than or equal to 0.8 mu m, and the transverse strain rate of the obtained material after plastic deformation treatment is more than or equal to 30 percent;
and sequentially carrying out two-dimensional extension deformation treatment and quenching treatment on the primary pure iron material to obtain the multi-angle grain boundary pure iron material.
2. The production method according to claim 1, wherein the pretreatment includes a rust removing treatment and an oxidation preventing treatment which are performed in this order.
3. The method of claim 2, wherein the de-rusting treatment is high-energy particle beam bombardment; in the high-energy particle beam bombardment, the particle source is carbon monoxide plasma, the power supply power is 2.6-4.3 kW, and the time is 12-18 min.
4. The production method according to claim 2, wherein the oxidation preventing treatment is a baking treatment; in the baking treatment, the baking steam is potassium hydroxide steam, the steam temperature is 710-790 ℃, and the baking time is 6-11 min.
5. The method for preparing the alloy material according to claim 1, wherein the equipment for plastic deformation treatment and stress relief treatment is a bidirectional high-pressure torsion and induction recovery system; the conditions of the rapid plastic deformation treatment and the stress relief treatment comprise: the torsion force is 800-1240 MPa, the reverse torsion period is 36-67 s, the torsion speed is 7-12 rpm, the induction heating temperature is 780-860 ℃, the single heating time is 6-11 s, the heating interval time is 2-4 s, and the heating times are 12-17.
6. The production method according to claim 1, wherein the two-dimensional deformation process is a micro-curved surface hammer; the conditions of the two-dimensional deformation process include: the effective hammering force is 320-410 MPa, and the hammering times at the same position are 3-6.
7. The production method according to claim 1, wherein the quenching treatment is double-jet quenching; the quenching treatment conditions include: the quenching temperature is 760-910 ℃, the quenching medium is deionized water, and the quenching medium is 65-75 ℃.
8. The multi-angle grain boundary pure iron material prepared by the preparation method of any one of claims 1 to 7.
9. The multi-angle grain boundary pure iron material of claim 8, wherein the multi-angle grain boundary pure iron material has a hardness of 33HRC or more, a tensile strength of 830MPa or more, an elongation of 47% or more, and a fracture toughness of 47.5 MPa-m1/2。
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