A method for treating high entropy alloys using a resistance electromagnetic composite thermal field laser cleaning system

Abstract

The present invention discloses a method for processing high-entropy alloys by a resistance electromagnetic composite thermal field laser cleaning system. The method belongs to the field of material preparation. The temperature can be effectively adjusted by the heating system. The electromagnetic heating module and the resistance heating plate are superimposed to achieve uniform and efficient thermal field control. The synergistic effect significantly improves the uniformity of heating and the processing effect. Combined with the laser cleaning module, it can solve the problems of low efficiency, poor formation effect, and easy defect generation in the production process, which leads to the corrosion of high-entropy alloys that cannot meet the use requirements. In addition, the present application uses a temperature heating system and reasonably sets the process parameters to further improve the mechanical properties of high-entropy alloys. During the processing, air with an oxygen concentration of 30% is injected, which is conducive to the formation of a dense oxide film, which helps to improve the surface quality and integrity of the high-entropy alloy.

Description

Technical Field

[0001] The present invention relates to the field of material preparation, and in particular to a method for processing high entropy alloys by a resistance electromagnetic composite thermal field laser cleaning system. Background Art

[0002] High-entropy alloys (HEAs) have a wide range of applications in corrosion resistance. These specialized alloys, composed of near-equimolar compositions, exhibit unique atomic arrangements and microstructures. HEAs exhibit excellent resistance to oxidation and high-temperature corrosion in high-temperature environments, resisting attack by various corrosive media, including oxidizing, sulfiding, and chlorinating agents. Consequently, they have attracted significant attention in high-temperature applications such as aerospace, energy, and petrochemicals. Furthermore, HEAs exhibit excellent resistance to acid and alkali corrosion, resisting attack by strong acids and bases, making them promising for use in the chemical industry and in acidic and alkaline environments. In seawater, HEAs resist chloride ion attack, marine corrosion, and seawater corrosion fatigue, offering broad application prospects in marine engineering and offshore structures. Furthermore, HEAs exhibit excellent wear resistance, resisting erosion and wear from abrasive media, offering potential applications in mineral processing, hydraulic equipment, and friction materials. In summary, the superior corrosion resistance of HEAs makes them a highly sought-after material choice across multiple industrial sectors.

[0003] High-entropy alloys (HEAs) are composed of multiple elements, and their complex atomic arrangement and microstructure enable them to exhibit excellent corrosion resistance. However, this also increases the difficulty of preparing and processing the alloys. Specifically, the interactions between different elements and the atomic arrangement in HEAs affect their corrosion resistance and require precise control. At the same time, studies have found that increasing the Al content in HEAs reduces their local corrosion resistance. Excessive Al can lead to an uneven passivation film, thereby affecting corrosion resistance. Therefore, when designing HEAs, it is necessary to balance the Al content to achieve optimal corrosion resistance. Although HEAs rarely produce microscopic defects, a certain number of defects still exist, which may affect corrosion resistance. Therefore, attention should be paid to the purity of the material and defect control when preparing and applying HEAs. In summary, the existing technology still has problems such as low HEA preparation efficiency, poor forming effect, and the easy generation of pores, cracks, and uneven chemical composition during the forming process. Summary of the Invention

[0004] Based on this, in order to solve the problems that the existing technology still has low high entropy alloy preparation effect, poor forming effect, and easy generation of pores, cracks, and uneven chemical composition during the forming process, the present invention provides a method for treating high entropy alloys with a resistance electromagnetic composite thermal field laser cleaning system. The specific technical solution is as follows:

[0005] A method for treating high entropy alloys using a resistance electromagnetic composite thermal field laser cleaning system, the method comprising the following steps:

[0006] The high entropy alloy sample is placed on a fixing module for fixing;

[0007] Under the action of the protective gas, the central control panel controls the laser cleaning processing module to perform horizontal and vertical orthogonal scanning on the high-entropy alloy sample several times to complete the first laser cleaning process;

[0008] The central control panel controls and adjusts the height of the insulation tank, injects air with an oxygen concentration of 30%, and controls the temperature heating system to perform heating treatment. At the same time, it controls the laser cleaning module to perform horizontal and vertical orthogonal scanning several times to complete the second laser cleaning process. When the temperature detection module detects that the temperature has reached the set temperature, it stops heating;

[0009] The heat-insulating tank, the temperature heating system, the laser cleaning processing module and the temperature detection module are respectively connected to the central control panel;

[0010] The temperature heating system includes relatively independent control units, namely a first-level temperature control unit and a second-level temperature control unit. The first-level temperature control unit is arranged on the electromagnetic heating module and connected to the electromagnetic heating module, and is used to adjust the initial heating stage, constant temperature heating stage and insulation stage of the electromagnetic heating module; the second-level temperature control unit is arranged on the resistance heating plate and connected to the resistance heating plate, and is used to adjust the constant temperature heating stage and insulation stage of the resistance heating plate.

[0011] Furthermore, the protective gas is argon.

[0012] Furthermore, the edge height of the thermal insulation groove is adjusted to be at least 20 mm higher than the high entropy alloy sample.

[0013] Furthermore, the parameters of the first laser cleaning process are: power of 40W to 45W, scanning speed of 2200mm / s to 2250mm / s, and flow rate of protective gas of 15L / min to 20L / min.

[0014] Furthermore, the parameters of the second laser cleaning process are: power of 40W to 50W, scanning speed of 2200mm / s to 2300mm / s, and air flow rate of 15L / min to 20L / min.

[0015] Furthermore, the heating rate in the initial heating stage is 6°C / min to 15°C / min, and when the temperature rises to 450°C to 550°C, the constant temperature heating stage is entered, and the time of the constant temperature heating stage is 1min to 5min.

[0016] Furthermore, the heat preservation stage is: cooling to 100°C to 150°C at a cooling rate of 5°C to 10°C, and keeping the temperature at 100°C to 150°C for 5min to 20min.

[0017] Furthermore, the several times is at least 2 times.

[0018] Furthermore, the heating rate in the initial heating stage is 10°C / min. After the temperature is raised to 500°C, it is heated at a constant temperature at 500°C for 2 minutes, then cooled to 100°C at a cooling rate of 5°C / min, and kept at 100°C for 10 minutes.

[0019] In the above scheme, the temperature can be effectively regulated by the heating system. The electromagnetic heating module and the resistance heating plate are superimposed to achieve uniform and efficient thermal field control. The synergistic effect significantly improves the uniformity of heating and the processing effect. Combined with the laser cleaning module, it can solve the problems of low efficiency, poor formation effect, and easy defect generation in the production process, which in turn leads to the corrosion of high-entropy alloys that cannot meet the use requirements. In addition, the present application uses a temperature heating system and reasonably sets the process parameters to further improve the mechanical properties of high-entropy alloys. During the processing, air with an oxygen concentration of 30% is also injected, which is conducive to the formation of a dense oxide film, which helps to improve the surface quality and integrity of the high-entropy alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of polarization curves of Example 1, Comparative Example 1 and Comparative Example 2;

[0021] Figure 2 This is a schematic diagram of the structure of the processing device of this application.

[0022] Description of reference numerals:

[0023] 1. Central control panel; 2. Thermal insulation tank; 3. Resistance heating plate; 4. Sample; 5. Electromagnetic heating device; 6. Air storage tank; 7. Protective gas storage tank; 8. Laser head; 9. Temperature detection device; 10. Exhaust device. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] In one embodiment of the present invention, a method for treating a high entropy alloy using a resistance electromagnetic composite thermal field laser cleaning system comprises the following steps:

[0027] The high entropy alloy sample is placed on a fixing module for fixing;

[0028] Under the action of the protective gas, the central control panel controls the laser cleaning processing module to perform horizontal and vertical orthogonal scanning on the high-entropy alloy sample several times to complete the first laser cleaning process;

[0029] The central control panel controls and adjusts the height of the insulation tank, injects air with an oxygen concentration of 30%, and controls the temperature heating system to perform heating treatment. At the same time, it controls the laser cleaning module to perform horizontal and vertical orthogonal scanning several times to complete the second laser cleaning process. When the temperature detection module detects that the temperature has reached the set temperature, it stops heating;

[0030] The heat-insulating tank, the temperature heating system, the laser cleaning processing module and the temperature detection module are respectively connected to the central control panel;

[0031] The temperature heating system includes relatively independent control units, namely a first-level temperature control unit and a second-level temperature control unit. The first-level temperature control unit is arranged on the electromagnetic heating module and connected to the electromagnetic heating module, and is used to adjust the initial heating stage, constant temperature heating stage and insulation stage of the electromagnetic heating module; the second-level temperature control unit is arranged on the resistance heating plate and connected to the resistance heating plate, and is used to adjust the constant temperature heating stage and insulation stage of the resistance heating plate.

[0032] In one embodiment, the shielding gas is argon.

[0033] In one embodiment, the edge height of the thermal insulation groove is adjusted to be at least 20 mm higher than the high entropy alloy sample.

[0034] In one embodiment, the parameters of the first laser cleaning process are: power of 40W to 45W, scanning speed of 2200mm / s to 2250mm / s, and flow rate of protective gas of 15L / min to 20L / min.

[0035] In one embodiment, the parameters of the second laser cleaning process are: power of 40W to 50W, scanning speed of 2200mm / s to 2300mm / s, and air flow rate of 15L / min to 20L / min.

[0036] In one embodiment, the heating rate in the initial heating stage is 6°C / min to 15°C / min. When the temperature rises to 450°C to 550°C, the constant temperature heating stage is entered, and the time of the constant temperature heating stage is 1min to 5min.

[0037] In one embodiment, the heat preservation stage is: cooling to 100°C to 150°C at a cooling rate of 5°C to 10°C, and keeping at 100°C to 150°C for 5min to 20min.

[0038] In one embodiment, the several times is at least 2 times.

[0039] In one embodiment, the heating rate in the initial heating stage is 10°C / min. After the temperature is raised to 500°C, it is heated at a constant temperature at 500°C for 2 minutes, then cooled to 100°C at a cooling rate of 5°C / min, and kept at 100°C for 10 minutes.

[0040] In one embodiment, the present application provides a high entropy alloy processing device, and the processing device includes a resistance electromagnetic composite thermal field laser cleaning system.

[0041] In one embodiment, the processing device includes a central control panel, an insulation tank, a resistance heating plate arranged on the insulation tank and abutting the insulation tank, an electromagnetic heating device arranged at the bottom of the insulation tank and abutting the insulation tank, an air storage tank, a protective gas storage tank and a temperature detection device, and the insulation tank, the resistance heating plate, the electromagnetic heating device, the air storage tank, the protective gas storage tank and the temperature detection device are respectively connected to the central control panel.

[0042] In one embodiment, the processing device is further provided with a laser processing device, and the laser processing device includes a laser head, and the laser head is connected to the central control panel.

[0043] In one embodiment, the processing device is further provided with an exhaust device, and the exhaust device is connected to the central control panel.

[0044] In the above scheme, the temperature can be effectively regulated by the heating system. The electromagnetic heating module and the resistance heating plate are superimposed to achieve uniform and efficient thermal field control. The synergistic effect significantly improves the uniformity of heating and the processing effect. Combined with the laser cleaning module, it can solve the problems of low efficiency, poor formation effect, and easy defect generation in the production process, which in turn leads to the corrosion of high-entropy alloys that cannot meet the use requirements. In addition, the present application uses a temperature heating system and reasonably sets the process parameters to further improve the mechanical properties of high-entropy alloys. During the processing, air with an oxygen concentration of 30% is also injected, which is conducive to the formation of a dense oxide film, which helps to improve the surface quality and integrity of the high-entropy alloy.

[0045] The embodiments of the present invention will be described in detail below with reference to specific examples.

[0046] Example 1:

[0047] A method for treating high entropy alloys using a resistance electromagnetic composite thermal field laser cleaning system, the method comprising the following steps:

[0048] A 10 mm × 10 mm AlCoCrFeNi high entropy alloy sample was placed on a fixing module for fixation;

[0049] Under the action of argon gas, the central control panel controls the laser cleaning module to perform two horizontal and vertical orthogonal scans on the AlCoCrFeNi high-entropy alloy sample. The parameters of the first laser cleaning process are as follows: power of 40 W, scanning speed of 2240 mm / s, and argon gas flow rate of 16 L / min, completing the first laser cleaning process.

[0050] The central control panel controls and adjusts the height of the insulation tank to be 20 mm higher than the AlCoCrFeNi high-entropy alloy sample, injects air with an oxygen concentration of 30%, and controls the temperature heating system for heating treatment. At the same time, the laser cleaning module is controlled again to perform two horizontal and vertical orthogonal scans. The parameters of the second laser cleaning process are: power of 40 W, scanning speed of 2240 mm / s, and air flow rate of 16 L / min. After the second laser cleaning process is completed, when the temperature detection module detects that the temperature has reached the set temperature, heating is stopped;

[0051] The heat-insulating tank, the temperature heating system, the laser cleaning processing module and the temperature detection module are respectively connected to the central control panel;

[0052] The temperature heating system includes relatively independent control units, namely a first-level temperature control unit and a second-level temperature control unit. The first-level temperature control unit is arranged on the electromagnetic heating module and connected to the electromagnetic heating module, and is used to adjust the initial heating stage, constant temperature heating stage and insulation stage of the electromagnetic heating module, and the heating rate of the initial heating stage is 10°C / min. When the temperature rises to 500°C, it enters the constant temperature heating stage. The time of the constant temperature heating stage is 5 minutes, and then it is cooled to 100°C at a cooling rate of 5°C, and is kept warm at 100°C for 10 minutes; the second-level temperature control unit is arranged on the resistance heating plate and connected to the resistance heating plate, and is used to adjust the temperature of the resistance heating plate to 500°C for constant temperature heating for 2 minutes, and then cooled to 100°C at a cooling rate of 5°C / min, and is kept warm at 100°C for 10 minutes.

[0053] Comparative Example 1:

[0054] The AlCoCrFeNi high entropy alloy sample is placed on a fixing module for fixing;

[0055] Under the action of argon gas, the central control panel controls the laser cleaning processing module to perform horizontal and vertical orthogonal scanning on the AlCoCrFeNi high entropy alloy sample twice, and the parameters of the laser cleaning processing are: power of 40W, scanning speed of 2240mm / s, and argon gas flow rate of 16L / min.

[0056] That is, in Comparative Example 1, only laser cleaning treatment was performed before electrochemical experiments were conducted to test the polarization curve.

[0057] Comparative Example 2:

[0058] Comparative Example 2 is a blank test, that is, the AlCoCrFeNi high entropy alloy sample that has undergone any treatment is directly subjected to an electrochemical experiment to test the polarization curve.

[0059] The AlCoCrFeNi high entropy alloy samples of Example 1, Comparative Example 1 and Comparative Example 2 were subjected to relevant performance tests, and the results are shown in Table 1 below.

[0060] Table 1:

[0061]

[0062] Figure 1The polarization curves for Example 1, Comparative Example 1, and Comparative Example 2 are schematic diagrams. The polarization curve test results show that the higher the self-corrosion potential, the better the corrosion resistance of the material, and the higher the passivation potential, the better the corrosion resistance of the material. The table shows that the self-corrosion potential and passivation potential after the combined thermal field + laser cleaning are the highest, indicating the best corrosion resistance. The self-corrosion potential and passivation potential without laser cleaning are the lowest, indicating the worst corrosion resistance. The values ​​of the self-corrosion potential and passivation potential of the sample that has only been laser cleaned are greater than those of the sample that has not been laser cleaned. The order of corrosion resistance from high to low is: electromagnetic heating + resistance heating + laser cleaning > laser cleaning > blank control. Therefore, the combined thermal field + laser cleaning has a significant effect on improving the corrosion resistance of high-entropy alloys.

[0063] Figure 2 This is a schematic diagram of the structure of the processing device of this application. Since this application does not protect the device, Figure 2 This is just a simple statement for the purpose of clarifying the present application. The specific circuit connections involved are not within the scope of protection of the present application and therefore will not be described in detail again.

[0064] In addition, the applicant also set up several sets of embodiments and comparative studies on the process parameters controlled by the temperature heating system. The specific process parameters are shown in Table 2 below.

[0065] Table 2:

[0066]

[0067] Relevant performance tests were performed on Example 2 and Comparative Examples 3 to 5, and the results are shown in Table 3 below.

[0068] Table 3:

[0069]

[0070] From the data analysis in Table 3, it can be seen that by setting up a temperature heating system, the present application can effectively control the process temperature parameters, which helps to improve the processing effect of the high-entropy alloy and make the corrosion resistance of the high-entropy alloy meet the use requirements. In addition, the high-entropy alloys of Examples 1 and 2 of the present application have excellent forming effects, and are not prone to problems such as pores, cracks, and uneven chemical composition during the forming process, and the overall surface quality is high.

[0071] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for treating high entropy alloys using a resistance electromagnetic composite thermal field laser cleaning system, characterized in that: The method comprises the following steps: The high entropy alloy sample is placed on a fixing module for fixing; Under the action of the protective gas, the central control panel controls the laser cleaning processing module to perform horizontal and vertical orthogonal scanning on the high-entropy alloy sample several times to complete the first laser cleaning process; The central control panel controls and adjusts the height of the thermal insulation groove so that the edge height of the thermal insulation groove is at least 20 mm higher than the high-entropy alloy sample, injects air with an oxygen concentration of 30%, and controls the temperature heating system to perform heating treatment. At the same time, the laser cleaning module is controlled again to perform horizontal and vertical orthogonal scanning several times to complete the second laser cleaning process. When the temperature detection module detects that the temperature reaches the set temperature, the heating is stopped; The heat-insulating tank, the temperature heating system, the laser cleaning processing module and the temperature detection module are respectively connected to the central control panel; The temperature heating system includes relatively independent control units, namely a first-level temperature control unit and a second-level temperature control unit. The first-level temperature control unit is arranged on the electromagnetic heating module and connected to the electromagnetic heating module, and is used to adjust the initial heating stage, constant temperature heating stage and insulation stage of the electromagnetic heating module; the second-level temperature control unit is arranged on the resistance heating plate and connected to the resistance heating plate, and is used to adjust the constant temperature heating stage and insulation stage of the resistance heating plate.

2. The method according to claim 1, characterized in that The protective gas is argon.

3. The method according to claim 1, characterized in that The parameters of the first laser cleaning process are as follows: power of 40W to 45W, scanning speed of 2200mm / s to 2250mm / s, and flow rate of protective gas of 15L / min to 20L / min.

4. The method according to claim 1, wherein The parameters of the second laser cleaning process are: power of 40W to 50W, scanning speed of 2200mm / s to 2300mm / s, and air flow rate of 15L / min to 20L / min.

5. The method according to claim 1, characterized in that The heating rate in the initial heating stage is 6°C / min to 15°C / min. When the temperature reaches 450°C to 550°C, the constant temperature heating stage is entered. The time of the constant temperature heating stage is 1 minute to 5 minutes.

6. The method according to claim 1, characterized in that The heat preservation stage comprises: cooling the temperature to 100° C. to 150° C. at a cooling rate of 5° C. to 10° C., and keeping the temperature at 100° C. to 150° C. for 5 min to 20 min.

7. The method according to claim 1, characterized in that The several times is at least 2 times.

8. The method according to any one of claims 1 to 7, characterized in that The heating rate in the initial heating stage is 10°C / min. After the temperature is raised to 500°C, it is heated at a constant temperature at 500°C for 2 minutes, then cooled to 100°C at a cooling rate of 5°C / min, and kept at 100°C for 10 minutes.

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