High-strength fe-mn damping alloy and method for producing the same

Abstract

This application provides a high-strength Fe-Mn damping alloy and its preparation method. The high-strength Fe-Mn damping alloy comprises the following components by mass percentage: Mn: 15%–18%, with the balance being Fe and unavoidable impurities. When the Mn content is 15%–18%, the thermally activated α'-martensite transformation, which is detrimental to damping performance, can be completely suppressed, while the thermally activated ε-martensite phase transformation is sufficient, resulting in an alloy product with a dual-phase structure of austenite and ε-martensite. The damping alloy exhibits high strength and plasticity, and at a strength of 3.5 × 10⁻⁶... ‑4 It exhibits excellent damping performance under strain amplitude, meeting the performance requirements of high-damping materials. The high-strength Fe-Mn damping alloy of this application does not require the addition of other alloying elements, and its cost is far lower than that of traditional damping alloys such as Mn-Cu, Zn-Al, and Mg-Ni.

Description

Technical Field

[0001] This application relates to the field of steel materials technology, and in particular to a high-strength Fe-Mn damping alloy and its preparation method. Background Technology

[0002] With the advancement of technology and the development of modern industry, more and more industrial equipment is pursuing high speed and high power, making vibration and noise problems increasingly prominent. Vibration and noise not only cause property damage and disasters, but also seriously threaten people's physical and mental health. On the one hand, vibration undermines the reliability and stability of equipment operation, affects equipment precision, shortens equipment lifespan, and may even cause equipment damage and failure; at the same time, vibration can trigger a series of vibration-related illnesses, such as neurasthenia, palpitations, and high blood pressure, and may even damage muscles, bones, and joints. On the other hand, the noise caused by vibration can induce symptoms such as ear pain, tinnitus, and arrhythmia; high-intensity noise can even lead to deafness.

[0003] Currently, many developed countries have classified noise pollution as a fourth type of pollution, in addition to the three major wastes (waste gas, wastewater, and solid waste), and noise pollution has gradually become an important environmental issue of social concern. Therefore, vibration reduction and noise control are among the key research areas that the industrial sector needs to focus on, and such research is of great significance to national economic development.

[0004] Damping alloys are functional materials that can absorb mechanical vibration energy and dissipate it by converting it into other forms of energy, thus addressing vibration and noise problems at the source. For a long time, damping alloys used both domestically and internationally have mostly been Mu-Cu, Fe-Cr, and Zn-Al alloys. However, these materials suffer from high cost, low strength, and their service environment is often affected by factors such as magnetic fields and temperature. Therefore, there is an urgent need to develop new damping materials. Summary of the Invention

[0005] This application provides a high-strength Fe-Mn damping alloy and its preparation method, aiming to provide a damping alloy with excellent damping performance and high yield strength.

[0006] In a first aspect, embodiments of this application provide a high-strength Fe-Mn damping alloy, comprising the following components by mass percentage: Mn: 15% to 18%, with the balance being Fe and unavoidable impurities.

[0007] According to an embodiment of the first aspect of this application, the microstructure of the high-strength Fe-Mn damping alloy is a dual-phase structure of austenite and ε-martensite.

[0008] According to an embodiment of the first aspect of this application, the high-strength Fe-Mn damping alloy has a yield strength of 687-909 MPa, a tensile strength of 839-953 MPa, and an elongation after fracture of 22%-35%.

[0009] According to an embodiment of the first aspect of this application, at 3.5 × 10 -4 Under strain amplitude, the specific damping of the high-strength Fe-Mn damping alloy is 16% to 20%.

[0010] Secondly, embodiments of this application provide a method for preparing a high-strength Fe-Mn damping alloy, which includes the following steps:

[0011] Obtain a billet with the following composition by mass fraction: Mn: 15% to 18%, with the balance being Fe and unavoidable impurities; subject the billet to hot rolling-cold rolling-first annealing treatment to obtain an annealed plate; subject the annealed plate to tensile pre-deformation-secondary annealing treatment to obtain a high-strength Fe-Mn damping alloy.

[0012] According to an embodiment of the second aspect of this application, the initial rolling temperature of hot rolling is 1150-1100°C, and the final rolling temperature is 970-990°C. In this case, the billet is heated to 1200°C and held for 2-3 hours before hot rolling.

[0013] According to an embodiment of the second aspect of this application, the reduction rate of cold rolling is 60-80%.

[0014] According to an embodiment of the second aspect of this application, the deformation rate of the tensile pre-deformation is 0% to 10%.

[0015] According to an embodiment of the second aspect of this application, a single annealing process includes annealing at 600°C for 30 minutes.

[0016] According to an embodiment of the second aspect of this application, the secondary annealing includes holding at 200°C for 2 hours.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The high-strength Fe-Mn damping alloy in this application embodiment comprises the following components by mass percentage: Mn: 15%–18%, with the balance being Fe and unavoidable impurities. When the Mn content is 15%–18%, the thermally activated α'-martensite transformation, which is detrimental to damping performance, can be completely suppressed, while the thermally activated ε-martensite phase transformation is sufficient, resulting in an alloy product with a dual-phase structure of austenite and ε-martensite. The damping alloy exhibits high strength and plasticity, and at a strength of 3.5 × 10⁻⁶... -4It exhibits excellent damping performance under strain amplitude, meeting the performance requirements of high-damping materials. The high-strength Fe-Mn damping alloy of this application does not require the addition of other alloying elements, and its cost is far lower than that of traditional damping alloys such as Mn-Cu, Zn-Al, and Mg-Ni. Attached Figure Description

[0019] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0020] Figure 1 The TEM morphology of the 600-0% alloy is shown, with the microstructure mainly consisting of austenite and stacking faults.

[0021] Figure 2 The TEM morphology of the 600-2% alloy is shown, and the microstructure is a dual-phase structure of austenite and ε-martensite. Detailed Implementation

[0022] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0023] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" does not require strict verticality, but may include permissible errors. "Parallel" does not require strict parallelism, but may include permissible errors.

[0024] Damping alloys are functional materials that can absorb mechanical vibration energy and dissipate it by converting it into other forms of energy, thus addressing vibration and noise problems at the source. For a long time, damping alloys used both domestically and internationally have mostly been Mu-Cu, Fe-Cr, and Zn-Al alloys. However, these materials suffer from high cost, low strength, and their service environment is often affected by factors such as magnetic fields and temperature. Therefore, there is an urgent need to develop new damping materials.

[0025] In the development of novel damping materials, Fe-Mn damping alloys have attracted much attention due to their excellent damping performance, superior mechanical properties, and low cost. Fe-Mn damping alloys exhibit a dual-phase structure of austenite and ε-martensite at room temperature. The presence of ε-martensite interfaces, ε-martensite / γ-austenite phase interfaces, and stacking fault interfaces within ε-martensite and γ-austenite contributes to the alloy's excellent damping performance.

[0026] Fe-Mn damping alloys have a dual-phase structure of face-centered cubic (FCC) and hexagonal close-packed (HCP), so the solid solution strengthening effect is weaker than that of alloys with body-centered cubic (BCC) structure, resulting in a generally low yield strength in Fe-Mn alloys.

[0027] In view of this, the inventors of this application, through extensive experimental research, provide a high-strength Fe-Mn damping alloy and its preparation method, aiming to provide a damping alloy with excellent damping performance and high yield strength.

[0028] High-strength Fe-Mn damping alloy

[0029] In a first aspect, embodiments of this application provide a high-strength Fe-Mn damping alloy having the following composition by mass fraction: Mn: 15% to 18%, with the balance being Fe and unavoidable impurities.

[0030] When the Mn content is 15%–18%, the thermally activated α'-martensite transformation, which is detrimental to damping performance, can be completely suppressed. Simultaneously, the thermally activated ε-martensite phase transformation is sufficient, resulting in a dual-phase microstructure of austenite and ε-martensite in the alloy product. This leads to high strength and plasticity in the damping alloy, while maintaining a strength of 3.5 × 10⁻⁶. -4 It exhibits excellent damping performance under strain amplitude, meeting the performance requirements of high-damping materials. The high-strength Fe-Mn damping alloy of this application does not require the addition of other alloying elements, and its cost is far lower than that of traditional damping alloys such as Mn-Cu, Zn-Al, and Mg-Ni.

[0031] For example, the mass fraction of Mn in the high-strength Fe-Mn damping alloy can be 15%, 15.2%, 15.5%, 15.7%, 16.2%, 16.5%, 16.7%, 17%, 17.2%, 17.5%, 17.7%, 18%, or any range of two of the above values.

[0032] In some embodiments, the microstructure of the high-strength Fe-Mn damping alloy is a dual-phase structure of austenite and ε-martensite.

[0033] The fine grains in the metallographic structure significantly improve the yield strength of the Fe-Mn damping alloy; ε-martensite enhances the damping performance of the high-strength Fe-Mn damping alloy, thus obtaining an Fe-Mn damping alloy with excellent damping performance and high yield strength. Preferably, the austenitic structure is equiaxed austenitic.

[0034] In some embodiments, the yield strength of the high-strength Fe-Mn damping alloy is 687 MPa to 909 MPa. Exemplarily, the yield strength of the high-strength Fe-Mn damping alloy can be 687 MPa, 690 MPa, 700 MPa, 710 MPa, 720 MPa, 730 MPa, 740 MPa, 750 MPa, 760 MPa, 770 MPa, 780 MPa, 790 MPa, 800 MPa, 810 MPa, 820 MPa, 830 MPa, 840 MPa, 850 MPa, 860 MPa, 870 MPa, 880 MPa, 890 MPa, 900 MPa, 909 MPa, or a range consisting of any two of the above values.

[0035] In some embodiments, the tensile strength of the high-strength Fe-Mn damping alloy is 839 MPa to 953 MPa. Exemplarily, the tensile strength of the high-strength Fe-Mn damping alloy can be 839 MPa, 840 MPa, 850 MPa, 860 MPa, 870 MPa, 880 MPa, 890 MPa, 900 MPa, 910 MPa, 920 MPa, 930 MPa, 940 MPa, 950 MPa, 953 MPa, or a range consisting of any two of the above values.

[0036] In some embodiments, the elongation after fracture of the high-strength Fe-Mn damping alloy is 22% to 35%. Elongation after fracture refers to the percentage of the length the specimen elongates when it breaks under external force (tensile force), compared to its original length. Exemplarily, the elongation after fracture of the high-strength Fe-Mn damping alloy can be 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, or a range of any two of the above values.

[0037] In some embodiments, 3.5 × 10 -4 At strain amplitude, the specific damping is 16%–20%. For example, at 3.5 × 10⁻⁶... -4 The specific damping of the high-strength Fe-Mn damping alloy under strain amplitude can be 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, or any combination of two of the above values.

[0038] Preparation method of high-strength Fe-Mn damping alloy

[0039] Secondly, embodiments of this application provide a method for preparing a high-strength Fe-Mn damping alloy, which includes the following steps:

[0040] Obtain a billet with the following composition by mass fraction: Mn: 15% to 18%, with the balance being Fe and unavoidable impurities; subject the billet to hot rolling-cold rolling-first annealing treatment to obtain an annealed steel sheet; subject the annealed steel sheet to tensile pre-deformation-secondary annealing treatment to obtain a high-strength Fe-Mn damping alloy.

[0041] In this embodiment, the original austenite grains are refined by cold rolling and one-time annealing, so that the alloy structure is completely recrystallized into a fine equiaxed austenite structure, which significantly improves the yield strength of the Fe-Mn damping alloy. A certain amount of ε-martensite is introduced by tensile pre-deformation to improve the damping performance of the high-strength Fe-Mn damping alloy, thereby obtaining a Fe-Mn damping alloy with excellent damping performance and high yield strength.

[0042] For example, the mass fraction of Mn in the high-strength Fe-Mn damping alloy can be 15%, 15.2%, 15.5%, 15.7%, 16.2%, 16.5%, 16.7%, 17%, 17.2%, 17.5%, 17.7%, 18%, or any range of two of the above values.

[0043] In some embodiments, prior to obtaining the billet, a smelting process is also included, employing a vacuum induction furnace for melting.

[0044] In some embodiments, the molten steel is poured to obtain an ingot, shrinkage cavities are removed, and it is forged into a steel billet with a cross-section of 130mm × 130mm. In some embodiments, before hot rolling, the ingot needs to be reheated to 1200°C and held for 2 to 3 hours.

[0045] In some embodiments, the initial rolling temperature of hot rolling is 1100℃~1150℃, and the final rolling temperature is 970℃~990℃. Exemplarily, the initial rolling temperature of hot rolling can be 1100℃, 1110℃, 1120℃, 1130℃, 1140℃, 1150℃, or any range of two of the above values. Exemplarily, the final rolling temperature of hot rolling can be 970℃, 972℃, 974℃, 976℃, 978℃, 980℃, 982℃, 984℃, 986℃, 988℃, 990℃, or any range of two of the above values.

[0046] By controlling the initial rolling temperature and final rolling temperature within the above range, the hot-rolled plate can undergo sufficient dynamic recrystallization.

[0047] Hot rolling can include multiple passes, with the following reduction sequence: 65mm→55mm→45mm→35mm→26mm→19mm→14mm→10mm→5mm.

[0048] In some embodiments, the hot-rolled sheet is further cold-rolled to 1.5 mm, with a cold rolling reduction rate of 60-80%. Exemplarily, the cold rolling reduction rate can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or a range of any two of the above values. By using a cold rolling reduction rate within the above range, the strength and ductility of the Fe-Mn damping alloy can be improved in conjunction with hot rolling and annealing processes.

[0049] Cold rolling and single annealing can produce steel plates with a fine equiaxed austenitic microstructure. Due to the grain refinement, the product has a high yield strength.

[0050] For example, the hot-rolled steel sheet has a thickness of 5 mm, and the hot-rolled sheet is further cold-rolled to 1.5 mm. The first annealing includes annealing at 600°C for 20 min to 40 min. For example, the annealing time at 600°C in the first annealing process can be 20 min, 25 min, 30 min, 25 min, 40 min, or any range of two of the above values.

[0051] The first annealing can be carried out in a box-type resistance furnace at the temperature mentioned above. This allows the cold-rolled alloy structure to be completely recrystallized into a fine equiaxed austenite structure, which significantly improves the yield strength of the Fe-Mn damping alloy.

[0052] In some embodiments, the deformation rate of the tensile pre-deformation is 0% to 10%. Exemplarily, the deformation rate of the tensile pre-deformation is 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, or any combination of two of the above values. Introducing a certain amount of ε-martensite through tensile pre-deformation improves the damping performance of the high-strength Fe-Mn damping alloy. Preferably, the deformation rate of the tensile pre-deformation is 0.5% to 10%.

[0053] In some embodiments, secondary annealing includes holding at 200°C for 1-3 hours. For example, the holding time at 200°C in the secondary annealing process can be 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, or any range of two of the above values.

[0054] Secondary annealing can be carried out in a precision hot blast furnace at the temperature mentioned above, which can eliminate the stress introduced by tensile pre-strain.

[0055] In this embodiment, by adjusting the composition and production method of the high-strength Fe-Mn damping alloy, the yield strength of the high-strength Fe-Mn damping alloy is 687–909 MPa, the tensile strength is 839–953 MPa, and the elongation after fracture is 22%–35%. (The last sentence appears to be incomplete and possibly refers to a different application or specification.) -4 Under strain amplitude, the specific damping of the high-strength Fe-Mn damping alloy is 16% to 20%.

[0056] Example

[0057] The following embodiments describe the disclosure of this application in more detail. These embodiments are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on weight, and all reagents used in the embodiments are commercially available or synthesized by conventional methods and can be used directly without further processing, and the instruments used in the embodiments are commercially available.

[0058] Example 1:

[0059] A high-strength Fe-Mn damping alloy has the chemical composition shown in Table 1, in wt%.

[0060] Table 1

[0061]

[0062] The high-strength Fe-Mn damping alloy is prepared according to the following process steps:

[0063] In this example, the alloy was melted and cast in a vacuum induction furnace, shrinkage cavities were removed, and it was forged into a 130mm × 130mm billet.

[0064] The billet was reheated to 1200℃ and held for 2 hours.

[0065] Hot rolling was performed on a 450mm two-roll reversible hot rolling mill. The reduction sequence was 65→55→45→35→26→19→14→10→5mm. The initial rolling temperature was 1150~1100℃, the final rolling temperature was 970~990℃, and the rolls were water-cooled to room temperature.

[0066] The hot-rolled sheet was further cold-rolled to 1.5 mm with a reduction rate of 70%, and then the cold-rolled sheet was placed in a box-type resistance furnace and annealed at 600°C for 30 min.

[0067] The alloy was subjected to a 0.5% tensile pre-deformation to introduce approximately 21% ε-martensite.

[0068] The pre-deformed alloy was placed in a precision hot blast furnace at 200℃ and held for 2 hours for stress-relief annealing.

[0069] Example 2:

[0070] A high-strength Fe-Mn damping alloy has the same composition as Example 1 and is prepared in a similar manner to Example 1. The difference is that the alloy is subjected to 1% tensile pre-deformation to introduce approximately 40% ε-martensite.

[0071] Example 3:

[0072] A high-strength Fe-Mn damping alloy has the same composition as Example 1 and is prepared in a similar manner to Example 1. The difference is that the alloy is subjected to a 2% tensile pre-deformation to introduce approximately 62% ε-martensite.

[0073] Example 4:

[0074] A high-strength Fe-Mn damping alloy has the same composition as Example 1 and is prepared in a similar manner to Example 1. The difference is that the alloy is subjected to a 5% tensile pre-deformation to introduce approximately 70% ε-martensite.

[0075] Example 5:

[0076] A high-strength Fe-Mn damping alloy has the same composition as Example 1 and is prepared in a similar manner to Example 1. The difference is that the alloy is subjected to a 10% tensile pre-deformation to introduce approximately 39% ε-martensite.

[0077] Example 6:

[0078] A high-strength Fe-Mn damping alloy has the same composition and preparation method as Example 1, except that it is not subjected to tensile pre-deformation treatment.

[0079] The high-strength Fe-Mn damping alloy products obtained in Examples 1-6 were subjected to tensile property testing according to GB / T 228.1-2010; damping performance was tested using a TAQ800 dynamic mechanical analyzer in single cantilever mode at a frequency of 1 Hz. The room temperature tensile properties and 3.5 × 10⁻⁶ tensile strength of Examples 1-6 were also tested. -4 The test results of damping performance under strain amplitude are shown in Table 2.

[0080] Table 2. Room temperature tensile properties and 3.5 × 10⁻⁶ of Examples 1-6 -4 Damping performance under strain amplitude

[0081]

[0082] Note: YS - Yield strength, UTS - Tensile strength, TE - Elongation after fracture, SDC - Specific damping

[0083] As shown in Table 2, the high-strength Fe-Mn damping alloys in Examples 1-6 contain 16% Mn, with the balance being Fe and unavoidable impurities. Cold rolling followed by a single annealing process refines the original austenite grains, allowing the alloy microstructure to fully recrystallize into a fine equiaxed austenite structure, significantly improving the yield strength of the Fe-Mn damping alloy. Tensile pre-deformation introduces a certain amount of ε-martensite, further enhancing the damping performance of the high-strength Fe-Mn damping alloy. The prepared high-strength Fe-Mn damping alloy exhibits excellent damping performance while maintaining high yield strength. This demonstrates that the chemical composition ratio and preparation method provided in this application, when combined, effectively enable the obtained high-strength Fe-Mn damping alloy to possess both excellent damping performance and high yield strength. Figure 1 The TEM morphology of the 600-0% alloy is shown, with the microstructure mainly consisting of austenite and stacking faults. Figure 2 The TEM morphology of the 600-2% alloy is shown, and the microstructure is a dual-phase structure of austenite and ε-martensite.

[0084] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-strength Fe-Mn damping alloy, characterized in that, It includes the following components in terms of mass percentage: Mn: 16%~18%, with the balance being Fe and unavoidable impurities; The metallographic structure of the high-strength Fe-Mn damping alloy is a dual-phase structure of austenite and ε-martensite. The high-strength Fe-Mn damping alloy has a yield strength of 687 MPa to 909 MPa, a tensile strength of 839 MPa to 953 MPa, and an elongation after fracture of 22% to 35%. At 3.5×10 -4 Under strain amplitude, the specific damping of the high-strength Fe-Mn damping alloy is 16%~20%; The high-strength Fe-Mn damping alloy is prepared by the following steps: Obtain a casting billet having the following composition by mass fraction: Mn: 16%~18%, with the balance being Fe and unavoidable impurities; The billet is subjected to hot rolling-cold rolling-one annealing treatment to obtain annealed steel plate; The annealed steel plate is subjected to tensile pre-deformation-secondary annealing treatment to obtain a high-strength Fe-Mn damping alloy; Before the hot rolling process, the billet is heated to 1200 ℃ and held for 2h~3h for homogenization. The initial rolling temperature of the hot rolling is 1150~1100 ℃, and the final rolling temperature is 970~990 ℃. The cold rolling reduction rate is 60-80%; the tensile pre-deformation deformation rate is 0%~10%; the primary annealing includes annealing at 600℃ for 20 min-40 min; the secondary annealing includes holding at 200℃ for 1 h-3 h.

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