CN116145044A - High-strength corrosion-resistant iron-based medium-entropy alloy with tensile strength of 1900MPa and preparation method thereof - Google Patents

High-strength corrosion-resistant iron-based medium-entropy alloy with tensile strength of 1900MPa and preparation method thereof Download PDF

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CN116145044A
CN116145044A CN202211583582.1A CN202211583582A CN116145044A CN 116145044 A CN116145044 A CN 116145044A CN 202211583582 A CN202211583582 A CN 202211583582A CN 116145044 A CN116145044 A CN 116145044A
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代春朵
侯华兴
张弛
孙美慧
郭呈宇
李江文
王艺橦
刘旭明
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Ansteel Beijing Research Institute
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Abstract

The invention relates to a high-strength corrosion-resistant iron-based medium-entropy alloy with a tensile strength of 1900MPa and a preparation method, wherein the alloy comprises the following chemical components in percentage by weight: fe a%; cr b%; ni c%; al d; ti e%; mo f%; cu g; p i%; s j%; wherein, a is more than 47 and less than 58, b is more than 13 and less than 15, c is more than 22 and less than or equal to 25,2, d is more than or equal to 3, e is more than or equal to 4 and less than or equal to 6, f is more than or equal to 1 and less than or equal to 2, g is more than or equal to 0 and less than or equal to 1, i is less than or equal to 0.001, j is less than or equal to 0.001, a+b+c+d+e+f+g+i+j=100; the mixing entropy is 1R-1.5R, R= 8.314J/(mol.times.K). The high-strength corrosion-resistant FeCrNiAlTi series medium-entropy alloy with the tensile strength of 1900MPa has good corrosion resistance, the tensile strength of more than or equal to 1900MPa, the preparation cost is reduced, and the industrial production is facilitated.

Description

High-strength corrosion-resistant iron-based medium-entropy alloy with tensile strength of 1900MPa and preparation method thereof
Technical Field
The invention belongs to the field of medium-entropy alloy, and relates to a high-strength corrosion-resistant iron-based medium-entropy alloy with 1900 MPa-level tensile strength and a preparation method thereof.
Background
The medium entropy alloy is developed on the basis of the high entropy alloy and comprises two to four main elements, the mixed entropy is 1R-1.5R, a simple solid solution is easy to form, and the low-order energy is realized. The medium-entropy alloy is a necessary product of the gradual design development of the high-entropy alloy in the alloying direction with the performance as a guide, is compatible with excellent performance and relatively low cost, but no matter the high-entropy alloy or the medium-entropy alloy, researchers try to continuously optimize the alloy performance, and the mechanical performance is improved, namely the strong plastic matching of the alloy is improved. The medium entropy alloy is typically represented by Co-Cr-Ni alloy, and a researcher regulates and controls the alloy structure, grain size and FCC-L12 nanometer precipitation behavior through 77K low-temperature cold rolling combined heat treatment process to obtain the Co-Cr-Ni medium entropy alloy with a heterostructure, wherein the strength of the alloy is as high as 2.2GPa, and the alloy has an elongation percentage of 13% (Du, X.H., li, W.P., chang, H.T.et al.Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entopy alloy, nat Commun,2020, 11:2390). According to reports, after heat working and 47h aging treatment, the yield strength, tensile strength and elongation of the entropy alloy in Fe-Ni-Al-Ti reach 868MPa,1830MPa and 12%, respectively, in the alloy, precipitation strengthening, and martensitic transformation and transformation induced plasticity occurring in the deformation process are intrinsic mechanisms for improving the alloy strong plasticity (Yang Y., chen T.Y., tan L.Z. et Al, bifunctional nanoprecipitates strengthen and ductilize a medium-technical alloy Nature,2021, 595:245-249). In the research and development of high-strength ultrahigh-strength high-entropy alloy/medium-entropy alloy at present, the high-density dispersed nano precipitated phase is considered to be capable of effectively improving the alloy strength without losing plasticity, and has been widely applied and has achieved a lot of breakthrough results. However, the research and development system is concentrated on a FeCoNi system, a FeCoNiCr system and a FeNiCr system, which generally contain a large amount of Co or Ni, have high cost and limit the large-scale application to a great extent. In addition, most of medium/high entropy alloy component systems contain a certain amount of Cr element, so that the corrosion resistance is good, most of researches only pay attention to the mechanical properties, the corrosion properties are directly related to the service life of the material, and the corresponding relation between the service properties and the environment can be established for the comprehensive property researches of the mechanical properties, the corrosion resistance and the like of the high-performance material, so that data support is provided for the service reliability of the material.
Based on the method, a low-cost high-strength iron-based corrosion-resistant medium-entropy alloy with the tensile strength of more than or equal to 1900MPa is developed, and the alloy has good corrosion resistance, and meanwhile, the preparation method of the alloy is economical, safe and reliable, and is suitable for mass production.
Disclosure of Invention
The invention aims to provide a high-strength corrosion-resistant iron-based intermediate entropy alloy with the tensile strength of 1900MPa and a preparation method thereof, so as to obtain the high-strength corrosion-resistant iron-based intermediate entropy alloy with the tensile strength of more than or equal to 1900MP at lower cost, and the high-strength corrosion-resistant iron-based intermediate entropy alloy has good corrosion resistance, and the preparation method of the intermediate entropy alloy is economical, safe and reliable.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the high-strength corrosion-resistant iron-based medium-entropy alloy with the tensile strength of 1900MPa comprises the following chemical components in percentage by weight:
fe a%; cr b%; ni c%; al d; ti e%; mo f%; cu g; p i%; s j%; wherein, a is more than 47 and less than 58, b is more than 13 and less than 15, c is more than 22 and less than or equal to 25,2, d is more than or equal to 3, e is more than or equal to 4 and less than or equal to 6, f is more than or equal to 1 and less than or equal to 2, g is more than or equal to 0 and less than or equal to 1, i is less than or equal to 0.001, j is less than or equal to 0.001, a+b+c+d+e+f+g+i+j=100; the mixing entropy is 1R-1.5R, R= 8.314J/(mol.times.K).
The purity of the Fe, cr, ni, al, ti, mo, cu metal raw material is more than or equal to 99.95 wt%.
The Ni element in the high-strength corrosion-resistant FeCrNiAlTi medium-entropy alloy with the tensile strength of 1900MPa can stabilize the FCC structure, ensure that the alloy stably exists in the FCC structure at room temperature, and is beneficial to large-deformation plastic processing of the alloy. Cr element is a key element for corrosion resistance of the alloy, and Mo element can further improve the corrosion resistance of the alloy. The addition of Al and Ti elements is favorable for forming a precipitation phase with Fe and Ni elements. In the alloy preparation process, the large deformation cold rolling can effectively break crystal grains and provide more precipitated phase nucleation sites, and the medium temperature aging can promote precipitation of the precipitated phase and limit the growth of the precipitated phase, inhibit the growth of the crystal grains and relieve the internal stress. Fine grain strengthening, precipitation strengthening and dislocation strengthening are combined to strengthen the FeCrNiAlTi medium entropy alloy.
A preparation method of a high-strength corrosion-resistant iron-based intermediate entropy alloy with the tensile strength of 1900MPa adopts a magnetic suspension vacuum induction furnace for smelting, performs plastic processing molding after homogenizing a sample, and obtains the intermediate entropy alloy through aging treatment, and specifically comprises the following steps:
1) Preparing raw materials: weighing and proportioning the medium-entropy alloy constituent elements according to the weight percentage;
2) Smelting: the magnetic suspension vacuum induction smelting is carried out under the protection of argon with the content of more than 99.99 percent, the argon filling pressure is-60 kPa to-65 kPa, the smelting current is 200A-300A, the turnover is repeatedly smelted for more than 3 times, the smelting time is 5-7 min each time, and finally, the cast ingot with uniform components is obtained;
3) Homogenizing: homogenizing the cast ingot at 1100-1200 deg.c for 2-12 hr;
4) And (3) rolling and forming: sequentially hot-rolling and cold-rolling to form;
5) Aging treatment: and (3) preserving the temperature of the rolled and formed sample at 500-700 ℃ for 2-12 hours, and aging to obtain the high-strength corrosion-resistant medium entropy alloy.
In the step 4), the cast ingot is directly hot-rolled after heat preservation for 2 to 12 hours at 1100 to 1200 ℃, the initial rolling temperature is 1150 to 1200 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 50 to 60 percent, and water cooling is performed after rolling; then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 80-85%.
Compared with the prior art, the invention has the beneficial effects that:
the high-strength corrosion-resistant FeCrNiAlTi medium-entropy alloy with the tensile strength of 1900MPa has good corrosion resistance, the tensile strength is more than or equal to 1900MPa, high-cost elements such as Co and the like are not contained, ni is saved, the preparation cost is reduced, and the industrial production is facilitated; the preparation method is economical, safe and reliable, and is suitable for mass production.
The intermediate entropy alloy can be used for preparing cold-rolled sheets and cold-drawn wires, has high strength and corrosion resistance, can be applied to the fields of national defense and military industry, cross-sea bridges and the like, has very broad development prospect, and has very high industrial development potential.
Drawings
Fig. 1 is an SEM image of the medium entropy alloy of example 1.
Fig. 2 is a room temperature stress-strain curve of the intermediate entropy alloys of examples 1 to 5.
Detailed Description
The present invention will be described in detail below with reference to the drawings of the specification, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The chemical composition of the mid-entropy alloy of the examples is shown in table 1.
Table 1 chemical composition of entropy alloy in each example (unit: wt.%)
Figure BDA0003992296830000031
Example 1
A preparation method of 1900 MPa-level high-strength corrosion-resistant iron-based medium-entropy alloy comprises the following steps:
(1) Preparing raw materials: the alloy is smelted by a magnetic suspension vacuum induction furnace, the weight of the alloy is 1kg, and the alloy composition elements of Fe, cr, ni, al, ti and Mo are weighed and proportioned according to the weight percentage shown in the table 1, so that the purity of the elements is more than or equal to 99.95 percent when the alloy is used for smelting.
(2) Smelting: the magnetic suspension vacuum induction smelting is carried out under the protection of high-purity argon (99.99%), the argon filling pressure is-60 kPa, the smelting current is 200A-300A, the primary smelting time is 5-7 min, and in order to ensure the components to be uniform, the overturning and repeated smelting are carried out for 3 times at least, and finally, the cast ingot with the uniform components is obtained.
(3) Homogenizing: and preserving the temperature at 1100-1200 ℃ for 2-12 h to carry out homogenization treatment on the cast ingot.
(4) And (3) rolling and forming: the ingot is directly hot rolled after homogenization, the initial rolling temperature is 1150-1200 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 50-60%, and water cooling is performed after rolling. Then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 80-85%.
(5) Aging treatment: and (3) preserving the temperature of the rolled and formed sample at 550-600 ℃ for 2-8 hours for aging treatment to obtain high-strength corrosion-resistant medium-entropy Alloy 1, and taking a tensile sample, a metallographic sample and an electrochemical sample by utilizing linear cutting.
(7) Microstructure observation and mechanical property test: the surface of the sample was polished with 500# sand paper, 800# sand paper, 1200# sand paper and 2000# sand paper, and the surface was polished with 2.5 μm polishing liquid for metallographic microstructure characterization. The alloy erosion agent is CuCl 2 :HCl:HNO 3 :H 2 O=1g:50 ml:25ml:150ml, dip a small amount of etching solution with absorbent cotton, wipe 60+ -10 s on the sample surface, wash with water and alcohol and blow dry. The microstructure of the alloy is shown in FIG. 1. Mechanical properties were tested according to GB/T228.1-2021, the stress-strain curve being shown as Alloy 1 in FIG. 2. As can be seen from the SEM image of the alloy in FIG. 1, the alloy has a typical strip shape after cold rolling, and a fine precipitated phase is formed on a substrate. As can be seen from FIG. 2, alloy 1 has a tensile strength of 1990MPa.
(8) Electrochemical testing: the alloy was tested for pitting potential in a 1mol/L NaCl solution using an electrokinetic potential polarization curve. First an electrochemical sample is prepared,welding wire to one side of the sample, and sealing the side with the welding spot with epoxy resin to expose 10×10mm 2 Is contacted with the solution. Samples were ground stepwise with 400# sandpaper, 800# sandpaper, 1500# sandpaper, and 2000# sandpaper. The standard three-electrode system is adopted, a working electrode is a medium entropy Alloy 1, a Saturated Calomel Electrode (SCE) is used as a reference electrode, an auxiliary electrode is a platinum sheet, and the test is carried out on an electrochemical workstation. The electrolyte in the experiment is 1mol/L NaCl solution, and the sample is at-1.3V before the experiment SCE The lower cathode was polarized for 180s to remove an oxide film formed in the air, and then an Open Circuit Potential (OCP) 7200s was recorded to stabilize the state. Then the potentiodynamic polarization curve was measured at a scan rate of 0.33mV/s from-0.5V OCP Scanning to 1mA/cm 2 The potential corresponding to the current density. The test result shows that Alloy 1 shows passivation phenomenon in 1mol/L NaCl solution, has obvious passivation area, and pitting potential is-0.08V SCE Has better corrosion resistance.
Example 2
A preparation method of a high-strength corrosion-resistant medium-entropy alloy with a tensile strength of 1900MPa level comprises the following steps:
(1) Preparing raw materials: smelting by using a magnetic suspension smelting furnace, wherein the alloy weight is 1kg, and the Fe, cr, ni, al, ti, mo and Cu elements are weighed and proportioned according to the weight percentage, so that the purity of the elements is more than or equal to 99.95 percent when the alloy is used for smelting.
(2) Smelting alloy in a magnetic suspension smelting furnace: alloy smelting is carried out under the protection of high-purity argon (99.99%), the argon filling pressure is-60 kPa, and in order to ensure the uniformity of components, the smelting is repeated for 3 times at least in a turn-over way, and the smelting current is 200A-300A. The primary smelting time is 5-7 min, and finally the cast ingot with uniform components is obtained.
(3) Homogenizing: and preserving the temperature at 1100-1200 ℃ for 2-12 h to carry out homogenization treatment on the cast ingot.
(4) And (3) rolling and forming: the ingot is directly hot rolled after homogenization, the initial rolling temperature is 1150-1180 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 50-60%, and water cooling is performed after rolling. Then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 80-85%.
(5) Aging treatment: and (3) preserving the temperature of the rolled and formed sample at 550-600 ℃ for 2-8 h for aging treatment to obtain high-strength corrosion-resistant medium-entropy Alloy 2, and taking a tensile sample and an electrochemical sample by utilizing linear cutting.
(7) Mechanical property test: mechanical properties were tested according to GB/T228.1-2021, the stress-strain curve being shown as Alloy 2 in FIG. 2. From the graph, alloy 2 has a tensile strength of 2000MPa.
(8) Electrochemical testing: the alloy was tested for pitting potential in a 1mol/L NaCl solution using an electrokinetic potential polarization curve. Firstly preparing an electrochemical sample, welding a wire on one surface of the sample, and sealing one side with a welding spot by using epoxy resin to expose 10X 10mm 2 Is contacted with the solution. Samples were ground stepwise with 400# sandpaper, 800# sandpaper, 1500# sandpaper, and 2000# sandpaper. The test was performed on an electrochemical workstation using a standard three electrode system, the working electrode being a medium entropy Alloy 2, the Saturated Calomel Electrode (SCE) being a reference electrode, the auxiliary electrode being a platinum sheet. The electrolyte in the experiment is 1mol/L NaCl solution, and the sample is at-1.3V before the experiment SCE The lower cathode was polarized for 180s to remove an oxide film formed in the air, and then an Open Circuit Potential (OCP) 7200s was recorded to stabilize the state. Then the potentiodynamic polarization curve was measured at a scan rate of 0.33mV/s from-0.5V OCP Scanning to 1mA/cm 2 The potential corresponding to the current density. The test result shows that Alloy 2 shows passivation phenomenon in 1mol/L NaCl solution, has obvious passivation area, and pitting potential is-0.05V SCE Has better corrosion resistance.
Example 3
A preparation method of 1900 MPa-level high-strength corrosion-resistant iron-based medium-entropy alloy comprises the following steps:
(1) Preparing raw materials: smelting by using a magnetic suspension smelting furnace, wherein the weight of the alloy is 1kg, and the Fe, cr, ni, al, ti, mo and Cu elements are weighed and proportioned according to the weight percentages shown in the table 1, so that the purity of the elements is more than or equal to 99.95 percent when the alloy is used for smelting.
(2) Smelting alloy in a magnetic suspension smelting furnace: alloy smelting is carried out under the protection of high-purity argon (99.99%), the argon filling pressure is-60 kPa, and the smelting current is 200A-300A. The primary smelting time is 5-7 min. In order to ensure the components to be uniform, repeatedly smelting for 3 times at least by turning over, and finally obtaining the cast ingot with uniform components.
(3) Homogenizing: and preserving the temperature at 1100-1200 ℃ for 2-12 h to carry out homogenization treatment on the cast ingot.
(4) And (3) rolling and forming: the ingot is directly hot rolled after homogenization, the initial rolling temperature is 1150-1180 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 50-60%, and water cooling is performed after rolling. Then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 80-85%.
(5) Aging treatment: and (3) preserving the temperature of the rolled and formed sample at 550-600 ℃ for 2-8 h for aging treatment to obtain high-strength corrosion-resistant medium-entropy Alloy 3, and taking a tensile sample and an electrochemical sample by utilizing linear cutting.
(6) Mechanical property test: mechanical properties were tested according to GB/T228.1-2021, the stress-strain curve being shown as Alloy 3 in FIG. 2. As can be seen, alloy 3 has a tensile strength of 2044MPa.
(7) Electrochemical testing: the alloy was tested for pitting potential in a 1mol/L NaCl solution using an electrokinetic potential polarization curve. Firstly preparing an electrochemical sample, welding a wire on one surface of the sample, and sealing one side with a welding spot by using epoxy resin to expose 10X 10mm 2 Is contacted with the solution. Samples were ground stepwise with 400# sandpaper, 800# sandpaper, 1500# sandpaper, and 2000# sandpaper. The test was performed on an electrochemical workstation using a standard three electrode system, the working electrode was a medium entropy Alloy 3, the Saturated Calomel Electrode (SCE) was a reference electrode, and the auxiliary electrode was a platinum sheet. The electrolyte in the experiment is 1mol/L NaCl solution, and the sample is at-1.3V before the experiment SCE The lower cathode was polarized for 180s to remove an oxide film formed in the air, and then an Open Circuit Potential (OCP) 7200s was recorded to stabilize the state. Then the potentiodynamic polarization curve was measured at a scan rate of 0.33mV/s from-0.5V OCP Scanning to 1mA/cm 2 The potential corresponding to the current density. The test result shows that Alloy 3 shows passivation phenomenon in 1mol/L NaCl solution, has obvious passivation area, and pitting potential is 0.01V SCE Has better corrosion resistance.
Example 4
A preparation method of 1900 MPa-level high-strength corrosion-resistant iron-based medium-entropy alloy comprises the following steps:
(1) Preparing raw materials: smelting by using a magnetic suspension smelting furnace, wherein the weight of the alloy is 1kg, and the Fe, cr, ni, al, ti, mo and Cu elements are weighed and proportioned according to the weight percentages shown in the table 1, so that the purity of the elements is more than or equal to 99.95 percent when the alloy is used for smelting.
(2) Smelting alloy in a magnetic suspension smelting furnace: alloy smelting is carried out under the protection of high-purity argon (99.99%), the argon filling pressure is-60 kPa, and the smelting current is 200A-300A. The primary smelting time is 5-7 min. In order to ensure the components to be uniform, repeatedly smelting for 3 times at least by turning over, and finally obtaining the cast ingot with uniform components.
(3) Homogenizing: and preserving the temperature at 1100-1200 ℃ for 2-12 h to carry out homogenization treatment on the cast ingot.
(4) And (3) rolling and forming: the ingot is directly hot rolled after homogenization, the initial rolling temperature is 1150-1180 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 50-60%, and water cooling is performed after rolling. Then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 80-85%.
(5) Aging treatment: and (3) preserving the temperature of the rolled sample at 600 ℃ for 4 hours for aging treatment to obtain high-strength corrosion-resistant medium-entropy Alloy 4, and taking a tensile sample and an electrochemical sample by utilizing wire cutting.
(6) Mechanical property test: mechanical properties were tested according to GB/T228.1-2021 and the stress-strain curve is shown as Alloy 4 in FIG. 2. As can be seen, alloy 4 has a tensile strength of 1967MPa.
(7) Electrochemical testing: the alloy was tested for pitting potential in a 1mol/L NaCl solution using an electrokinetic potential polarization curve. Firstly preparing an electrochemical sample, welding a wire on one surface of the sample, and sealing one side with a welding spot by using epoxy resin to expose 10X 10mm 2 Is contacted with the solution. Samples were ground stepwise with 400# sandpaper, 800# sandpaper, 1500# sandpaper, and 2000# sandpaper. Adopting a standard three-electrode system, wherein a working electrode is a medium entropy Alloy 4, a Saturated Calomel Electrode (SCE) is used as a reference electrode, and electricity is assistedThe test was performed on an electrochemical workstation with a platinum plate. The electrolyte in the experiment is 1mol/L NaCl solution, and the sample is at-1.3V before the experiment SCE The lower cathode was polarized for 180s to remove an oxide film formed in the air, and then an Open Circuit Potential (OCP) 7200s was recorded to stabilize the state. Then the potentiodynamic polarization curve was measured at a scan rate of 0.33mV/s from-0.5V OCP Scanning to 1mA/cm 2 The potential corresponding to the current density. The test result shows that Alloy 4 shows passivation phenomenon in 1mol/L NaCl solution, has obvious passivation area, and pitting potential is 0.02V SCE Has better corrosion resistance.
Example 5
A preparation method of 1900 MPa-level high-strength corrosion-resistant iron-based medium-entropy alloy comprises the following steps:
(1) Preparing raw materials: smelting by using a magnetic suspension smelting furnace, wherein the weight of the alloy is 1kg, and the Fe, cr, ni, al, ti, mo and Cu elements are weighed and proportioned according to the weight percentages shown in the table 1, so that the purity of the elements is more than or equal to 99.95 percent when the alloy is used for smelting.
(2) Smelting alloy in a magnetic suspension smelting furnace: alloy smelting is carried out under the protection of high-purity argon (99.99%), the argon filling pressure is-60 kPa, and the smelting current is 200A-300A. The primary smelting time is 5-7 min. In order to ensure the components to be uniform, repeatedly smelting for 3 times at least by turning over, and finally obtaining the cast ingot with uniform components.
(3) Homogenizing: and preserving the temperature at 1100-1200 ℃ for 2-12 h to carry out homogenization treatment on the cast ingot.
(4) And (3) rolling and forming: the ingot is directly hot rolled after homogenization, the initial rolling temperature is 1150-1180 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 60%, and water cooling is performed after rolling. Then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 85%.
(5) Aging treatment: and (3) preserving the temperature of the rolled and formed sample at 550-600 ℃ for 4 hours to perform aging treatment to obtain high-strength corrosion-resistant medium-entropy Alloy 5, and taking a tensile sample and an electrochemical sample by utilizing wire cutting.
(6) Mechanical property test: mechanical properties were tested according to GB/T228.1-2021, the stress-strain curve being shown as Alloy 5 in FIG. 2. As can be seen, alloy 5 has a tensile strength of 1929MPa.
(7) Electrochemical testing: the alloy was tested for pitting potential in a 1mol/L NaCl solution using an electrokinetic potential polarization curve. Firstly preparing an electrochemical sample, welding a wire on one surface of the sample, and sealing one side with a welding spot by using epoxy resin to expose 10X 10mm 2 Is contacted with the solution. Samples were ground stepwise with 400# sandpaper, 800# sandpaper, 1500# sandpaper, and 2000# sandpaper. The test was performed on an electrochemical workstation using a standard three electrode system, the working electrode being a medium entropy Alloy 5, the Saturated Calomel Electrode (SCE) being a reference electrode, the auxiliary electrode being a platinum sheet. The electrolyte in the experiment is 1mol/L NaCl solution, and the sample is at-1.3V before the experiment SCE The lower cathode was polarized for 180s to remove an oxide film formed in the air, and then an Open Circuit Potential (OCP) 7200s was recorded to stabilize the state. Then the potentiodynamic polarization curve was measured at a scan rate of 0.33mV/s from-0.5V OCP Scanning to 1mA/cm 2 The potential corresponding to the current density. The test result shows that Alloy 5 shows passivation phenomenon in 1mol/L NaCl solution, has obvious passivation area, and pitting potential is 0.05V SCE Has better corrosion resistance.

Claims (4)

1. The high-strength corrosion-resistant iron-based medium-entropy alloy with the tensile strength of 1900MPa is characterized by comprising the following chemical components in percentage by weight:
fe a%; cr b%; ni c%; al d; ti e%; mo f%; cu g; p i%; s j%; wherein, a is more than 47 and less than 58, b is more than 13 and less than 15, c is more than 22 and less than or equal to 25,2, d is more than or equal to 3, e is more than or equal to 4 and less than or equal to 6, f is more than or equal to 1 and less than or equal to 2, g is more than or equal to 0 and less than or equal to 1, i is less than or equal to 0.001, j is less than or equal to 0.001, a+b+c+d+e+f+g+i+j=100; the mixing entropy is 1R-1.5R, R= 8.314J/(mol.times.K).
2. The high-strength corrosion-resistant iron-based medium entropy alloy with 1900MPa of tensile strength according to claim 1, wherein the purity of the Fe, cr, ni, al, ti, mo, cu metal raw material is more than or equal to 99.95 wt%.
3. The method for preparing the high-strength corrosion-resistant iron-based medium-entropy alloy with the tensile strength of 1900MPa according to claim 1 or 2, wherein the method is characterized in that a magnetic suspension vacuum induction furnace is adopted for smelting, a sample is homogenized and then is subjected to plastic processing forming, and the medium-entropy alloy is obtained through aging treatment, and specifically comprises the following steps:
1) Preparing raw materials: weighing and proportioning the medium-entropy alloy constituent elements according to the weight percentage;
2) Smelting: the magnetic suspension vacuum induction smelting is carried out under the protection of argon with the content of more than 99.99 percent, the argon filling pressure is-60 kPa to-65 kPa, the smelting current is 200A-300A, the turnover is repeatedly smelted for more than 3 times, the smelting time is 5-7 min each time, and finally, the cast ingot with uniform components is obtained;
3) Homogenizing: homogenizing the cast ingot at 1100-1200 deg.c for 2-12 hr;
4) And (3) rolling and forming: sequentially hot-rolling and cold-rolling to form;
5) Aging treatment: and (3) preserving the temperature of the rolled and formed sample at 500-700 ℃ for 2-12 hours, and aging to obtain the high-strength corrosion-resistant medium entropy alloy.
4. The method for preparing the high-strength corrosion-resistant iron-based medium entropy alloy with the tensile strength of 1900MPa according to claim 3, wherein in the step 4), the cast ingot is directly hot-rolled after being subjected to heat preservation for 2-12 hours at 1100-1200 ℃, the initial rolling temperature is 1150-1200 ℃, the final rolling temperature is not lower than 980 ℃, the total deformation of hot rolling is 50-60%, and water cooling is carried out after rolling; then the sample is subjected to solid solution treatment at 1050-1150 ℃ for 1h, and then is subjected to cold rolling, wherein the total deformation of the cold rolling is 80-85%.
CN202211583582.1A 2022-12-10 2022-12-10 High-strength corrosion-resistant iron-based medium-entropy alloy with tensile strength of 1900MPa and preparation method thereof Pending CN116145044A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117026109A (en) * 2023-09-05 2023-11-10 燕山大学 High-strength creep-resistant low-specific gravity high/medium-entropy heat-resistant steel and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117026109A (en) * 2023-09-05 2023-11-10 燕山大学 High-strength creep-resistant low-specific gravity high/medium-entropy heat-resistant steel and preparation method thereof
CN117026109B (en) * 2023-09-05 2024-03-19 燕山大学 High-strength creep-resistant low-specific gravity high/medium-entropy heat-resistant steel and preparation method thereof

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