CN112725709A - Surface modification method for improving room-temperature plasticity of iron-based amorphous alloy - Google Patents
Surface modification method for improving room-temperature plasticity of iron-based amorphous alloy Download PDFInfo
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- CN112725709A CN112725709A CN202110053885.1A CN202110053885A CN112725709A CN 112725709 A CN112725709 A CN 112725709A CN 202110053885 A CN202110053885 A CN 202110053885A CN 112725709 A CN112725709 A CN 112725709A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/02—Amorphous alloys with iron as the major constituent
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/003—Making ferrous alloys making amorphous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C2200/00—Crystalline structure
- C22C2200/02—Amorphous
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Abstract
The invention discloses a surface modification method for improving room-temperature plasticity of an iron-based amorphous alloy, and belongs to the field of material surface modification. In particular to a method for improving and enhancing the room temperature plasticity of iron-based amorphous alloy by carrying out shot blasting treatment on the surface of the iron-based amorphous alloy aiming at the characteristics of high strength and low room temperature plasticity of the iron-based amorphous alloy. The basic process is as follows: firstly, preparing the iron-based amorphous alloy required by the experiment by applying a fluoring purification technology and a J-queuing technology; and secondly, carrying out shot blasting treatment on the amorphous surface by adopting automatic control (numerical control) shot blasting equipment to obtain the surface modified iron-based amorphous alloy. The invention has the advantages that: the method has the advantages of simple equipment, convenient operation, low cost, economy, high efficiency, no three-waste discharge and large-scale popularization and application potential; and secondly, the room-temperature compression plastic deformation capacity is obviously improved and can be improved by more than 2-8 times. The method is mainly used for preparing the iron-based amorphous alloy with high strength and good room temperature plasticity.
Description
Technical Field
The invention belongs to the field of material surface modification, and particularly relates to a surface modification method for improving room-temperature plasticity of an iron-based amorphous alloy.
Background
In recent decades, iron-based amorphous alloys have attracted attention due to their excellent strength, elastic deformation, magnetic properties, etc., and thus have a wide application prospect in the fields of nuclear materials, mechanical manufacturing, medical devices, semiconductor materials, chemical materials, etc., and also can open up a new research direction for related subject fields and provide new opportunities and ways for solving major scientific problems.
Although fe-based amorphous alloys have many unique properties, they also have a fatal weakness, strain softening. Different from the traditional crystal material, the iron-based amorphous alloy does not have the defects of dislocation, stacking fault and other crystals, the plastic deformation of the iron-based amorphous alloy is mainly controlled by the generation and proliferation of shear bands, and the iron-based amorphous alloy shows a highly localized characteristic, so that the amorphous alloy has no macroscopic plasticity at room temperature, and the application range of the amorphous alloy as a structural material and a functional material is limited. Therefore, the room temperature plasticity of the iron-based amorphous alloy is improved, and the iron-based amorphous alloy has important academic significance and application value.
Disclosure of Invention
The invention aims to solve the problem that the room-temperature plasticity of the conventional iron-based amorphous alloy is very poor, and provides a surface modification method for improving the room-temperature plasticity of the iron-based amorphous alloy.
The surface modification method for improving the room temperature plasticity of the iron-based amorphous alloy is characterized in that the iron-based amorphous alloy with high strength and good room temperature plasticity is obtained by shot blasting treatment on the iron-based amorphous surface, and the room temperature plasticity improving amplitude can be as high as 8 times.
The iron-based amorphous alloy is ternary Fe80P13C7Amorphous alloy and quaternary Fe50Ni30P13C7Amorphous alloy and hexahydric Fe74Si3B4P10C4Mo5And (3) amorphous alloy.
A surface modification method for improving room temperature plasticity of an iron-based amorphous alloy specifically comprises the following steps:
step 1: preparing the iron-based amorphous alloy required by the experiment by using a fluoring purification technology and a J-queuing technology;
step 2: determining shot blasting parameters such as target shot blasting strength and the like according to the size specification and performance requirements of the sample;
and step 3: checking the working procedures before shot blasting to ensure that all the working procedures are in place, and clamping the sample;
and 4, step 4: shot blasting is carried out on the sample according to the technological parameter requirements;
and 5: after the shot blasting is finished, the sample is unloaded from the clamp, and the shot-blasted sample is inspected to ensure that no embedded broken shot exists on the surface, no bump damage exists, the coverage rate of the surface and the like meet the requirements;
step 6: cutting the amorphous sample after shot blasting into a sample with the length-diameter ratio of 2:1, and measuring the mechanical property data of the sample by using a universal testing machine, wherein the mechanical property data comprises yield strength sigmayBreaking strength σfAnd compression plasticity εp。
The iron-based amorphous alloy shot blasting process adopts practical and effective relevant process parameters, such as: the type of the shot blasting medium, the size of the shot blasting medium, the shot blasting time, the shot blasting intensity, the shot blasting coverage rate, the distance from a shot blasting machine nozzle to the surface of the sample and the like. Therefore, all process parameters in the shot blasting process should be controlled within a reasonable range to achieve the best shot blasting modification effect.
In the invention, when the shot blasting is performed, the air pressure is controlled to be 0.1MPa to 0.4MPa, the distance from a nozzle of a shot blasting machine to the surface of a sample is 100mm to 150mm, the shot blasting media are glass shots (the shot specification is selected by referring to HB/Z26-2011), the shot size specifications are BZ10 (100 mu m), BZ15 (150 mu m) and BZ20 (200 mu m), the shot blasting angle is 90 degrees, the shot blasting time is about 20s to 1min, the shot blasting intensity is about 0.15mmA to 0.30mmA, and the shot blasting coverage is 100%.
The effect of shot peening surface treatment is characterized primarily by shot strength. If the shot blasting strength is too low, the introduced residual compressive stress is small, and the expected modification effect cannot be achieved; if the shot strength is too high, microcracks are easily formed on the surface of the sample, resulting in relaxation or redistribution of the residual stress field of the shot, and consequently the expected modification effect is not achieved. The selection of the shot blasting process parameters directly determines the actual shot blasting quality and effect, so that all process parameters in the shot blasting process are controlled within a reasonable range.
The invention has the following advantages: (1) the equipment is simple. The iron-based amorphous alloy can be subjected to shot blasting treatment by automatic control (numerical control) shot blasting equipment, so that the surface performance can be improved. (2) The performance can be regulated and controlled. The amorphous alloy structure and the residual stress field are regulated and controlled by optimizing the shot blasting process parameters, so that the differentiated performance requirements in the practical engineering application are met. (3) And (4) mass production. The method has the advantages of low cost, simple and easy operation, economy, high efficiency and no three-waste discharge, and can meet the batch production requirement of industrial application.
The invention has the following effects: the surface modification method for improving the room-temperature plasticity of the iron-based amorphous alloy has very obvious plasticizing effect, such as the capacity of adding Fe with the plastic deformation less than 0.4 percent80P13C7The amorphous alloy is improved to about 3.2 percent, and the amplitude is increased by more than 8 times.
Drawings
FIG. 1 is Fe80P13C7X-ray diffraction spectra of as-cast untreated (numbered comparative example 1) and shot-peened (numbered example 1) amorphous alloy test specimens;
FIG. 2 is a stress-strain curve for comparative example 1 and example 1;
FIG. 3 is an SEM image of a side shear band of comparative example 1;
FIG. 4 is an enlarged view of area A of FIG. 3;
FIG. 5 shows surface-modified Fe obtained in example 180P13C7SEM picture of side shear zone of amorphous alloy sample;
FIG. 6 is an enlarged view of area A of FIG. 5;
FIG. 7 is Fe50Ni30P13C7Stress-strain curves for as-cast untreated (numbered comparative example 2) and shot peened (numbered example 2) amorphous alloy specimens;
FIG. 8 is Fe74Si3B4P10C4Mo5Stress-strain comparison curves for as-cast untreated (numbered comparative example 3) and shot-peened (numbered example 3) amorphous alloy test specimens.
Detailed Description
The invention provides a surface modification method for improving room temperature plasticity of iron-based amorphous alloy, which improves the room temperature plasticity of iron-based amorphous alloy by shot blasting treatment on the surface of the iron-based amorphous alloy, wherein the improvement amplitude can be as high as 8 times, and the invention is further explained in detail by combining with embodiments and drawings.
Example 1
For Fe80P13C7The method comprises the following steps of (1) carrying out shot blasting on a ternary iron-based amorphous alloy sample by using automatic control (numerical control) shot blasting equipment, wherein the process parameter requirements are as follows: the shot blasting medium is glass shot, the shot blasting time is 30s, the shot blasting intensity is about 0.15mmA, the shot blasting coverage rate is 100%, the air pressure is 0.2MPa, and the shot blasting angle is 90 degrees; and carrying out compression plasticity detection on the processed amorphous alloy sample by using a universal testing machine.
Example 2
For Fe50Ni30P13C7The method comprises the following steps of (1) carrying out shot blasting on a quaternary iron-based amorphous alloy sample by using automatic control (numerical control) shot blasting equipment, wherein the process parameter requirements are as follows: the shot blasting medium is glass shot, the shot blasting time is 30s, the shot blasting intensity is about 0.15mmA, the shot blasting coverage rate is 100%, the air pressure is 0.2MPa, and the shot blasting angle is 90 degrees; and carrying out compression plasticity detection on the processed amorphous alloy sample by using a universal testing machine.
Example 3
For Fe74Si3B4P10C4Mo5The six-membered iron-based amorphous alloy sample is subjected to shot blasting treatment by using automatic control (numerical control) shot blasting equipment, and the process parameter requirements are as follows: the shot blasting medium is glass shot, the shot blasting time is 30s, the shot blasting intensity is about 0.20mmA, the shot blasting coverage rate is 100%, the air pressure is 0.3 Mpa, and the shot blasting angle is 90 degrees; and carrying out compression plasticity detection on the processed amorphous alloy sample by using a universal testing machine.
The foregoing is a description of the preferred embodiments of the present invention. It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made to the present invention in the case where the scope of the claims, the detailed description of the invention, the drawings, and the like is satisfied, and the present invention falls within the scope of the present invention.
Claims (8)
1. A surface modification method for improving room temperature plasticity of an iron-based amorphous alloy is characterized in that the method obtains the iron-based amorphous alloy with high strength and good room temperature plasticity by shot blasting treatment on the iron-based amorphous surface, the room temperature plasticity improving amplitude can be as high as 8 times, and the method specifically comprises the following steps:
(1) preparing the iron-based amorphous alloy by using a fluoring purification technology and a J-queuing technology;
(2) and (3) carrying out shot blasting treatment on the surface of the iron-based amorphous alloy to obtain the surface-modified iron-based amorphous alloy.
2. The surface modification method for improving room temperature plasticity of the iron-based amorphous alloy according to claim 1, wherein the air pressure is controlled to be 0.1-0.4 MPa during the shot blasting in the step (2).
3. The method of claim 1, wherein the shot blasting in step (2) is performed for a time period of about 20s to 1 min.
4. The surface modification method for improving room temperature plasticity of the Fe-based amorphous alloy according to claim 1, wherein the shot blasting speed in the step (2) is controlled to be 60-100 m/s.
5. The surface modification method for improving room temperature plasticity of the Fe-based amorphous alloy according to claim 1, wherein the distance from the nozzle of the shot blasting machine to the surface of the Fe-based amorphous alloy sample during the shot blasting in the step (2) is 100mm to 150 mm.
6. The method as claimed in claim 1, wherein the blasting media used in the step (2) of blasting is glass shot (the shot specification is selected with reference to HB/Z26-2011), and the shot sizes are BZ10 (100 μm), BZ15 (150 μm) and BZ20 (200 μm).
7. The surface modification method for improving room temperature plasticity of an iron-based amorphous alloy according to claim 1, wherein the shot blasting in the step (2) is performed at a shot blasting angle of 90 °, a shot blasting strength of 0.15 mmA-0.30 mmA, and a shot blasting coverage of 100%.
8. The surface modification method for improving room temperature plasticity of iron-based amorphous alloy according to claim 1, wherein the iron-based amorphous alloy is ternary Fe80P13C7Amorphous alloy and quaternary Fe50Ni30P13C7Amorphous alloy and hexahydric Fe74Si3B4P10C4Mo5And (3) amorphous alloy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115652225A (en) * | 2022-11-03 | 2023-01-31 | 新疆大学 | Ni-based bulk amorphous alloy with room temperature large plasticity and preparation method thereof |
| CN115976431A (en) * | 2022-11-03 | 2023-04-18 | 新疆大学 | Method for improving corrosion resistance of iron-based block amorphous alloy |
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2021
- 2021-01-15 CN CN202110053885.1A patent/CN112725709A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115652225A (en) * | 2022-11-03 | 2023-01-31 | 新疆大学 | Ni-based bulk amorphous alloy with room temperature large plasticity and preparation method thereof |
| CN115976431A (en) * | 2022-11-03 | 2023-04-18 | 新疆大学 | Method for improving corrosion resistance of iron-based block amorphous alloy |
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