High-damping Fe-Mn alloy material and preparation method thereof

Abstract

The invention discloses a high-damping Fe-Mn series alloy material. The alloy is prepared from the following components in percentage by mass: 16.5 to 17.5 percent of Mn, 0.5 to 0.8 percent of doped metal, 0.02 to 0.03 percent of TiB2, 0.01 to 0.015 percent of C, 0.015 to 0.02 percent of Si and the balance of Fe. According to the high-damping Fe-Mn alloy material provided by the invention, through component optimization and process improvement of the alloy material, a method of combining forging, staged solid solution and staged aging is adopted, so that the prepared Fe-Mn alloy material has the comprehensive performance of high damping, high strength and good toughness; ni, Zr and Mo doped metals and a small amount of TiB2 in a specific ratio are added, Ni improves stacking fault energy, stabilizes austenite and performs solid solution strengthening, Zr and Mo form intermetallic compounds for precipitation strengthening and grain refining, TiB2 promotes grain refining, C and Si influence the strength, plasticity and processing performance of the alloy, all the elements have a synergistic effect, and the alloy has the good mechanical property and the good mechanical property. And the balance of high damping, high strength and good low-temperature toughness of the Fe-Mn alloy is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of damping alloys, and particularly relates to a high-damping Fe-Mn-based alloy material and a preparation method thereof. Background Art

[0002] As a kind of functional materials, damping alloys have become the forefront of materials science research. At present, the research on damping alloys mainly focuses on two aspects: the damping mechanism and damping performance of alloys. Among various types of damping alloys, Fe-Mn-based damping alloys have broad application prospects in the fields of aerospace, petrochemical industry, transportation, and energy due to their good internal friction performance, high strength, and low price.

[0003] According to the conventional design idea of damping alloys, it is difficult to compromise between damping performance and mechanical properties, which restricts the materials in the process of engineering applications in many aspects and greatly limits the development and application of new damping alloys. For example, dislocation-type damping alloys represented by magnesium alloys have the characteristics of contradictory damping and strength properties. Their damping performance is relatively high, but their strength is often low. Another example is that twinning-type damping alloys represented by manganese copper alloys have strong temperature sensitivity and are greatly affected by aging. Their damping performance will decrease significantly with time, and their corrosion resistance is also relatively poor. Another example is that Fe-Mn-based damping alloys also have high damping performance. Compared with many damping alloys, Fe-Mn-based damping alloys not only have good damping performance but also have relatively high strength, but their toughness still needs to be further improved.

[0004] Chinese Patent Application CN107641769A discloses a Fe-based composite alloy with wide strain amplitude and high damping and a preparation method thereof. The surface of the Fe-based composite alloy provided by this invention is a layer of ferrite, and the core is austenite with a face-centered cubic structure and martensite with a hexagonal close-packed structure. Moreover, the weight percentage content of chromium in the surface ferrite layer is ≥4%. The specific method for preparing the Fe-based composite alloy in this invention is as follows: First, an Fe-Mn-Cr-based alloy with the weight percentages of each element being Mn 12-25%, Cr 3-25%, Co 0-3%, Si 0-1%, Ti 0-1%, Nb 0-1%, Mg 0-1%, C 0-0.1%, N 0-0.1%, and the balance being Fe and inevitable impurities is treated at 900°C - 1200°C for ≥15 minutes in a vacuum environment, then furnace-cooled to room temperature, and finally treated at 200°C - 500°C for 2 hours - 48 hours and then furnace-cooled to room temperature. The alloy prepared by this method has good damping performance under wide strain amplitude, but a large amount of ferrite in this alloy makes the mechanical properties of the material poor, and this method has no deformation process and is only suitable for processing individual parts and cannot be combined with the mainstream rolling deformation process of current metal materials. Chinese Patent Application CN103898401A discloses a method for improving the damping performance of a high-strength Fe-Mn-based damping alloy, belonging to the field of damping alloys. This invention can significantly improve the damping performance of a high-strength Fe-Mn-based damping alloy, especially its damping performance under low strain amplitude. The weight percentage content of each element in the high-strength Fe-Mn-based damping alloy described in this invention is: Mn 15-23%, Co 0-3%, Si 0-1%, Cr 0-12%, Ti 0-1%, Mg 0-1%, C 0-0.1%, N 0-0.1%, and the balance being Fe and inevitable impurities. The specific method is as follows: First, the Fe-Mn-based damping alloy is solution-treated at 800°C - 1100°C for 10 minutes - 2 hours, then aged at 50°C - 400°C for 10 minutes - 10 hours, and finally deformed by 1% - 10% at room temperature. However, the Fe-Mn damping alloy prepared by this method has low mechanical properties, and its yield strength is only 300 MPa.

[0005] Therefore, it is of great significance to develop a high-damping and high-toughness Fe-Mn-based alloy material in this field. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of this invention is to provide a high-damping Fe-Mn-based alloy material and a preparation method thereof.

[0007] To achieve the above purpose, this invention provides the following technical solutions:

[0008] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0009] Mn 16.5 - 17.5%, doped metal 0.5 - 0.8%, TiB2 0.02 - 0.03%, C 0.01 - 0.015%, Si 0.015 - 0.02%, balance Fe.

[0010] Preferably, a high-damping Fe-Mn series alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0011] Mn 17 - 17.5%, doped metal 0.6 - 0.7%, TiB2 0.02 - 0.025%, C 0.012 - 0.015%, Si 0.015 - 0.018%, balance Fe.

[0012] Preferably, the doped metal consists of Ni, Zr, and Mo, and the mass ratio of the three is 6 - 8:2 - 3:1 - 2.

[0013] In the present invention, with Fe as the matrix, the Mn content is precisely controlled at 16.5 - 17.5% to obtain an appropriate amount of ε martensitic transformation damping, and a specific ratio of Ni, Zr, and Mo doped metals and a small amount of TiB2 are added. Among them, Ni increases the stacking fault energy, stabilizes austenite and strengthens by solid solution, Zr and Mo form intermetallic compounds for precipitation strengthening and grain refinement, TiB2 promotes grain refinement, and C and Si affect the strength, plasticity, and processing performance of the alloy. The elements act synergistically to achieve the balance of high damping, high strength, and good toughness of the Fe-Mn series alloy.

[0014] Preferably, the doped metal consists of Ni, Zr, and Mo, and the mass ratio of the three is 7:2.5:1.5.

[0015] The present invention also protects a preparation method of the high-damping Fe-Mn series alloy material as described above, including the following steps:

[0016] S1. Weigh the raw materials according to the ratio, mix them and put them into a vacuum induction furnace. After evacuating, under the argon protection atmosphere, carry out induction melting and casting to obtain an alloy ingot;

[0017] S2. Forge the alloy ingot in step S1 to obtain a slab;

[0018] S3. Hot-roll the slab in step S2, and cool it to room temperature after hot-rolling;

[0019] S4. Carry out solution treatment and aging treatment on the slab hot-rolled in step S3 to obtain a heat-treated slab;

[0020] S5. Carry out cold rolling treatment and annealing treatment on the heat-treated slab in step S4 to obtain the high-damping Fe-Mn series alloy material.

[0021] Preferably, the vacuum degree of the vacuum induction furnace in step S1 is 5×10 -3 Pa; the temperature of the induction melting is 1550 - 1600 °C, and the holding time is 20 - 30 min.

[0022] Preferably, the starting forging temperature in step S2 is 1150 - 1200 °C, the final forging temperature is 900 - 950 °C, and water cooling is carried out after forging.

[0023] In the present invention, the alloy ingot is forged, the coarse grains in the as-cast structure are broken and refined, defects such as shrinkage cavities and porosity generated during the casting process are eliminated, the density and uniformity of the alloy are improved, and at the same time, the grain orientation is changed, creating conditions for obtaining better structures and properties in subsequent hot rolling and heat treatment.

[0024] Preferably, the starting temperature of the hot rolling in step S3 is 1050 - 1150 °C, the final rolling temperature is 850 - 900 °C, the total reduction ratio ≥ 70%, and air cooling or water cooling is carried out after rolling.

[0025] In the present invention, the hot rolling process is through plastic deformation at high temperature, further refining the grains, improving the tissue morphology, enhancing the mechanical properties of the alloy, and at the same time, the hot rolling process can eliminate the work hardening generated during the forging process, preparing for the subsequent solution treatment.

[0026] Preferably, the solution treatment in step S4 is as follows: first hold at a temperature of 850 - 900 °C for 1 - 2 h, then hold at a temperature of 950 - 1000 °C for 2 - 3 h, and then hold at a temperature of 1050 - 1100 °C for 1 - 2 h, and water quench after solution; the aging treatment is as follows: hold at a temperature of 250 - 300 °C for 1 - 2 h, then hold at a temperature of 350 - 400 °C for 1 - 2 h, and finally hold at a temperature of 400 - 450 °C for 2 - 3 h, and cool to room temperature in the furnace.

[0027] In the present invention, in order to more effectively control the dissolution process of each phase in the alloy and obtain better structures and properties, a staged solution treatment is adopted. The staged solution treatment can obtain a more uniform solid solution, reduce grain growth, and reduce thermal stress, thereby improving the comprehensive performance of the alloy; at the same time, a staged aging treatment is adopted. Through the staged aging treatment, finer and more dispersed ε martensite and intermetallic compounds can be obtained, thereby improving the damping performance and other mechanical properties of the alloy.

[0028] Preferably, the total deformation amount of the cold rolling treatment in step S5 is 15% - 25%, and multi-pass small reduction amounts are used for cold rolling; the temperature of the annealing treatment is 600 - 700 °C, the holding time is 1 - 2 h, and air cooling is carried out after annealing.

[0029] In the present invention, the heat-treated slab is subjected to cold rolling and annealing treatments. Cold rolling introduces a certain amount of deformation, increases the dislocation density, enhances the strength of the alloy, and eliminates part of the work hardening through annealing treatment, adjusting the hardness and toughness of the alloy. Meanwhile, the annealing process can also promote the transformation of part of the retained austenite into ε martensite, further improving the damping performance of the alloy. Adopting multi-pass cold rolling with small reduction can avoid cracking caused by large reduction in a single pass and ensure the smooth progress of the processing.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The high-damping Fe-Mn-based alloy material provided by the present invention, through the optimization of the alloy material composition and the improvement of the process, adopts a method combining forging, step-by-step solution treatment and step-by-step aging treatment, enabling the prepared Fe-Mn-based alloy material to have comprehensive properties of high damping, high strength and good toughness. With Fe as the matrix, the Mn content is precisely controlled at 16.5 - 17.5% to obtain an appropriate amount of ε martensite phase transformation damping, and specific ratios of Ni, Zr, Mo doping metals and a small amount of TiB2 are added. Among them, Ni increases the stacking fault energy, stabilizes austenite and strengthens by solid solution, Zr and Mo form intermetallic compounds for precipitation strengthening and grain refinement, TiB2 promotes grain refinement, and C and Si affect the strength, plasticity and processing performance of the alloy. The elements act synergistically to achieve the balance of high damping, high strength and good low-temperature toughness of the Fe-Mn-based alloy.

[0032] (2) The high-damping Fe-Mn-based alloy material provided by the present invention uses Ni, Zr, and Mo doped metals in specific proportions to comprehensively regulate the stacking fault energy, phase transformation behavior, microstructure, and mechanical properties of the alloy; Ni is an austenite-forming element that can increase the stacking fault energy of the Fe-Mn alloy and can dissolve in both the γ-phase and ε-phase to produce a solid solution strengthening effect and increase the strength of the alloy. If its content is too high, the γ-phase will be too stable, the content of ε-martensite will be too low, and the damping performance will decrease. If the content is too low, it cannot effectively increase the stacking fault energy and stabilize the γ-phase, and its improvement effect on strength and low-temperature toughness is also limited; Zr can form intermetallic compounds with elements such as Fe, Mn, and Ni, playing a role in precipitation strengthening. It can also pin dislocations and grain boundaries / phase boundaries, hindering their movement and increasing the strength and damping performance of the alloy. If the content is too high, there will be too many intermetallic compounds, which may make the alloy brittle and reduce its toughness. If the content is too low, it cannot effectively form intermetallic compounds, and the effects of precipitation strengthening and grain refinement are not obvious. By regulating the content of Zr in the present invention, it can not only ensure the formation of a certain number of intermetallic compounds, playing a role in strengthening and refining grains, but also avoid embrittlement caused by excessive Zr; Mo acts synergistically with elements such as Ni and Zr in the formula. During the aging treatment process, it can precipitate in the form of fine and dispersed second-phase particles and distribute in the alloy matrix. These dispersed second-phase particles can effectively hinder the movement of dislocations. If the content of Mo is too low, it cannot fully exert its synergistic effect with Zr, and the effects of precipitation strengthening and grain refinement will be affected. If the content of Mo is too high, it may lead to too many and too large intermetallic compounds formed, reducing the toughness and plasticity of the alloy and making the alloy brittle; at the same time, during the solidification and heat treatment processes of the alloy, Mo and Zr can serve as heterogeneous nucleation sites to promote grain refinement. Finer grains can improve the strength, low-temperature toughness, and damping performance of the alloy, enabling the prepared alloy to have good comprehensive performance.

[0033] (3) The high-damping Fe-Mn based alloy material provided by the present invention prepares the alloy material through the coordination of formula and process, with staged solution treatment (holding at 850 - 900 °C for 1 - 2 h → 950 - 1000 °C for 2 - 3 h → 1050 - 1100 °C for 1 - 2 h, water quenching) and staged aging treatment (holding at 250 - 300 °C for 1 - 2 h → 350 - 400 °C for 1 - 2 h → 400 - 450 °C for 2 - 3 h, furnace cooling). It can more precisely control the microstructure and precipitation phases of the alloy. The staged solution treatment can make various elements in the alloy dissolve into the solid solution more fully and uniformly, avoiding the problem of grain coarsening that may be caused by single-stage high-temperature solution treatment; the staged aging treatment can more precisely control the precipitation process of ε martensite and intermetallic compounds, forming nano-scale precipitation phases with a dispersed distribution. These precipitation phases can effectively pin dislocations and subgrain boundaries / phase boundaries, hinder their movement, improve the damping performance and strength of the alloy; at the same time, it avoids embrittlement caused by coarse precipitation phases and improves the low-temperature toughness of the alloy. Description of the Drawings

[0034] Figure 1 SEM micrograph of the fracture morphology of the Fe-Mn based alloy material prepared in Example 1 of the present invention. Detailed Embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Example 1

[0037] A high-damping Fe-Mn based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0038] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, with the balance being Fe; the doped metal consists of Ni, Zr, and Mo with a mass ratio of 7:2.5:1.5.

[0039] A preparation method of a high-damping Fe-Mn based alloy material, comprising the following steps:

[0040] S1. Weigh the raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After evacuating to a vacuum degree of 5×10 - 3Pa, and then argon gas was filled to 500 Pa. Under the argon gas protection atmosphere, induction melting was carried out at a temperature of 1580 °C for a holding time of 25 min, followed by casting to obtain an alloy ingot;

[0041] S2. The alloy ingot in step S1 was forged. The initial forging temperature was 1200 °C, the final forging temperature was 950 °C, and water cooling was carried out after forging to obtain a slab;

[0042] S3. The slab in step S2 was hot-rolled. The starting temperature was 1100 °C, the final rolling temperature was 900 °C, and the total reduction ratio was ≥70%. After hot-rolling, it was air-cooled or water-cooled to room temperature;

[0043] S4. The slab after hot-rolling in step S3 was solution-treated. First, it was held at a temperature of 880 °C for 1.5 h, then at a temperature of 980 °C for 2.5 h, and then at a temperature of 1080 °C for 1.5 h. After solution treatment, water quenching was carried out; then aging treatment was carried out. It was held at a temperature of 270 °C for 1.5 h, then at a temperature of 370 °C for 1.5 h, and finally at a temperature of 420 °C for 2.5 h, and cooled to room temperature in the furnace to obtain a heat-treated slab;

[0044] S5. The heat-treated slab in step S4 was cold-rolled with multiple passes and small reduction amounts, and the total deformation amount was 20%. Then annealing treatment was carried out. The annealing temperature was 650 °C, the holding time was 1.5 h, and it was air-cooled after annealing, thus obtaining the high-damping Fe-Mn-based alloy material.

[0045] Example 2

[0046] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fractions of each component are as follows:

[0047] Mn 17%, doped metal 0.6%, TiB2 0.023%, C 0.013%, Si 0.018%, and the balance is Fe; the doped metal consists of Ni, Zr, and Mo with a mass ratio of 6.5:2.5:2.

[0048] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0049] S1. Weigh the raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After pumping to a vacuum degree of 5×10 - 3 Pa, and then argon gas was filled to 500 Pa. Under the argon gas protection atmosphere, induction melting was carried out at a temperature of 1550 °C for a holding time of 25 min, followed by casting to obtain an alloy ingot;

[0050] S2. Forge the alloy ingot in step S1, with the initial forging temperature being 1150°C, the final forging temperature being 900°C, and water-cooling after forging to obtain a slab.

[0051] S3. Hot-roll the slab in step S2, with the starting temperature being 1100°C, the final rolling temperature being 870°C, and the total reduction ratio ≥ 70%. Air-cool or water-cool to room temperature after hot-rolling.

[0052] S4. Solution-treat the slab after hot-rolling in step S3. First, hold at 870°C for 1.5 h, then hold at 970°C for 2.5 h, and then hold at 1070°C for 1.5 h. Quench with water after solution treatment. Then, perform aging treatment. Hold at 270°C for 1.5 h, then hold at 370°C for 1.5 h, and finally hold at 430°C for 2.5 h. Cool in the furnace to room temperature to obtain a heat-treated slab.

[0053] S5. Cold-roll the heat-treated slab in step S4 with multiple passes and small reduction amounts, with the total deformation amount being 20%. Then, perform annealing treatment at 650°C for 1.5 h. Air-cool after annealing to obtain the high-damping Fe-Mn-based alloy material.

[0054] Example 3

[0055] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fractions of each component are as follows:

[0056] Mn 16.5%, doped metal 0.5%, TiB2 0.02%, C 0.01%, Si 0.015%, and the balance is Fe; the doped metal consists of Ni, Zr, and Mo with a mass ratio of 6:3:1.

[0057] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0058] S1. Weigh the raw materials according to the above ratios, mix them and put them into a vacuum induction furnace. After evacuating to a vacuum degree of 5×10 - 3 Pa, then fill with argon to 500 Pa. Under the protection of argon atmosphere, perform induction melting at 1550°C for 30 min, and then cast to obtain an alloy ingot.

[0059] S2. Forge the alloy ingot in step S1, with the initial forging temperature being 1150°C, the final forging temperature being 900°C, and water-cooling after forging to obtain a slab.

[0060] S3. Hot-roll the slab in step S2, with the starting temperature being 1050°C, the final rolling temperature being 850°C, and the total reduction ratio ≥ 70%. Air-cool or water-cool to room temperature after hot-rolling.

[0061] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is kept at a temperature of 850 °C for 2 h, then at a temperature of 950 °C for 3 h, and then at a temperature of 1050 °C for 2 h, followed by water quenching after solution treatment. Then aging treatment is carried out. It is kept at a temperature of 250 °C for 2 h, then at a temperature of 350 °C for 2 h, and finally at a temperature of 400 °C for 3 h, and cooled to room temperature in the furnace to obtain a heat-treated slab.

[0062] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and a small reduction ratio, and the total deformation amount is 15%. Then annealing treatment is carried out. The annealing temperature is 600 °C and the holding time is 2 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0063] Example 4

[0064] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0065] Mn 17.5%, doped metal 0.8%, TiB2 0.03%, C 0.015%, Si 0.02%, the balance is Fe; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 8:2:2.

[0066] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0067] S1. Weigh the raw materials according to the above ratios, mix them and put them into a vacuum induction furnace. After evacuating to a vacuum degree of 5×10 - 3 Pa, then fill with argon to 500 Pa. Under the argon protection atmosphere, carry out induction melting at a temperature of 1600 °C and a holding time of 20 min, and cast to obtain an alloy ingot.

[0068] S2. Forge the alloy ingot in step S1. The starting forging temperature is 1200 °C, the final forging temperature is 950 °C, and it is water-cooled after forging to obtain a slab.

[0069] S3. Hot-roll the slab in step S2. The starting temperature is 1150 °C, the final rolling temperature is 900 °C, and the total reduction ratio ≥70%. After hot rolling, it is air-cooled or water-cooled to room temperature.

[0070] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is kept at 900 °C for 1 h, then at 950 °C for 2 h, and then at 1100 °C for 1 h, and then water quenched after solution treatment; then aging treatment is carried out, kept at 300 °C for 1 h, then at 400 °C for 1 h, and finally at 450 °C for 2 h, and cooled to room temperature in the furnace to obtain a heat-treated slab.

[0071] S5. The heat-treated slab in step S4 is cold rolled with multiple passes and small reduction ratios, and the total deformation amount is 25%. Then annealing treatment is carried out, the annealing temperature is 700 °C, and the holding time is 1 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn based alloy material.

[0072] Comparative Example 1

[0073] A high-damping Fe-Mn based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0074] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, the balance is Fe; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 8:2.5:0.5.

[0075] A preparation method of a high-damping Fe-Mn based alloy material includes the following steps:

[0076] S1. Weigh raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After pumping to a vacuum degree of 5×10 - 3 Pa, and then fill with argon to 500 Pa. Under the argon protection atmosphere, induction melting is carried out at a temperature of 1580 °C for a holding time of 25 min, and then casting is carried out to obtain an alloy ingot.

[0077] S2. The alloy ingot in step S1 is forged, the initial forging temperature is 1200 °C, the final forging temperature is 950 °C, and it is water-cooled after forging to obtain a slab.

[0078] S3. The slab in step S2 is hot rolled, the starting temperature is 1100 °C, the final rolling temperature is 900 °C, the total reduction rate ≥ 70%, and it is air-cooled or water-cooled to room temperature after hot rolling.

[0079] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is held at a temperature of 880 °C for 1.5 h, then at a temperature of 980 °C for 2.5 h, and then at a temperature of 1080 °C for 1.5 h. After solution treatment, water quenching is carried out. Then aging treatment is carried out. It is held at a temperature of 270 °C for 1.5 h, then at a temperature of 370 °C for 1.5 h, and finally at a temperature of 420 °C for 2.5 h. It is cooled to room temperature in the furnace to obtain a heat-treated slab.

[0080] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and small reduction ratios, and the total deformation amount is 20%. Then annealing treatment is carried out. The annealing temperature is 650 °C and the holding time is 1.5 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0081] Compared with Example 1, in the doped alloy of this comparative example, the mass ratio of Ni, Zr, and Mo is 8:2.5:0.5, and the content of Mo is relatively low.

[0082] Comparative Example 2

[0083] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0084] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, and the balance is Fe; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 6:2.5:2.5.

[0085] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0086] S1. Weigh raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After pumping to a vacuum degree of 5×10 - 3 Pa, and then fill it with argon to 500 Pa. Under the protection of argon atmosphere, induction melting is carried out at a temperature of 1580 °C and a holding time of 25 min, and then casting is carried out to obtain an alloy ingot.

[0087] S2. Forge the alloy ingot in step S1. The initial forging temperature is 1200 °C, the final forging temperature is 950 °C, and it is water-cooled after forging to obtain a slab.

[0088] S3. Hot-roll the slab in step S2. The starting temperature is 1100 °C, the final rolling temperature is 900 °C, and the total reduction rate ≥ 70%. After hot rolling, it is air-cooled or water-cooled to room temperature.

[0089] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is held at a temperature of 880 °C for 1.5 h, then held at a temperature of 980 °C for 2.5 h, and then held at a temperature of 1080 °C for 1.5 h. After solution treatment, water quenching is carried out; then aging treatment is carried out. It is held at a temperature of 270 °C for 1.5 h, then held at a temperature of 370 °C for 1.5 h, and finally held at a temperature of 420 °C for 2.5 h. It is cooled to room temperature in the furnace to obtain a heat-treated slab.

[0090] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and small reduction ratios, and the total deformation amount is 20%. Then annealing treatment is carried out. The annealing temperature is 650 °C and the holding time is 1.5 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0091] Compared with Example 1, in the doped alloy of this comparative example, the mass ratio of Ni, Zr, and Mo is 6:2.5:2.5, and the Mo content is on the high side.

[0092] Comparative Example 3

[0093] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0094] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, Fe balance; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 8:1.5:1.5.

[0095] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0096] S1. Weigh raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After pumping to a vacuum degree of 5×10 - 3 Pa, and then fill it with argon to 500 Pa. Under the argon protection atmosphere, induction melting is carried out at a temperature of 1580 °C and a holding time of 25 min, and then casting is carried out to obtain an alloy ingot.

[0097] S2. Forge the alloy ingot in step S1. The initial forging temperature is 1200 °C, the final forging temperature is 950 °C, and it is water-cooled after forging to obtain a slab.

[0098] S3. Hot-roll the slab in step S2. The starting temperature is 1100 °C, the final rolling temperature is 900 °C, and the total reduction rate ≥70%. After hot rolling, it is air-cooled or water-cooled to room temperature.

[0099] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is held at a temperature of 880 °C for 1.5 h, then at a temperature of 980 °C for 2.5 h, and then at a temperature of 1080 °C for 1.5 h. After solution treatment, it is water quenched; then aging treatment is carried out. It is held at a temperature of 270 °C for 1.5 h, then at a temperature of 370 °C for 1.5 h, and finally at a temperature of 420 °C for 2.5 h, and cooled to room temperature in the furnace to obtain a heat-treated slab;

[0100] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and small reduction ratios, and the total deformation amount is 20%. Then annealing treatment is carried out. The annealing temperature is 650 °C and the holding time is 1.5 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0101] Compared with Example 1, the mass ratio of Ni, Zr, and Mo in the doped alloy is 8:1.5:1.5, and the content of Zr is relatively low.

[0102] Comparative Example 4

[0103] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0104] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, the balance is Fe; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 6:3.5:1.5.

[0105] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0106] S1. Weigh the raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After pumping to a vacuum degree of 5×10 - 3 Pa, and then fill with argon to 500 Pa. Under the protection of argon atmosphere, induction melting is carried out at a temperature of 1580 °C and a holding time of 25 min, and then casting is carried out to obtain an alloy ingot;

[0107] S2. Forge the alloy ingot in step S1. The initial forging temperature is 1200 °C and the final forging temperature is 950 °C. After forging, it is water-cooled to obtain a slab;

[0108] S3. Hot-roll the slab in step S2. The starting temperature is 1100 °C and the final rolling temperature is 900 °C. The total reduction ratio ≥ 70%. After hot rolling, it is air-cooled or water-cooled to room temperature;

[0109] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is kept at a temperature of 880 °C for 1.5 h, then at a temperature of 980 °C for 2.5 h, and then at a temperature of 1080 °C for 1.5 h. After solution treatment, water quenching is carried out. Then aging treatment is carried out. It is kept at a temperature of 270 °C for 1.5 h, then at a temperature of 370 °C for 1.5 h, and finally at a temperature of 420 °C for 2.5 h. It is cooled to room temperature in the furnace to obtain a heat-treated slab.

[0110] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and small reduction ratios, and the total deformation amount is 20%. Then annealing treatment is carried out. The annealing temperature is 650 °C and the holding time is 1.5 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0111] Compared with Example 1, the mass ratio of Ni, Zr, and Mo in the doped alloy is 6:3.5:1.5, and the content of Zr is on the high side.

[0112] Comparative Example 5

[0113] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0114] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, Fe as the balance; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 7:2.5:1.5.

[0115] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0116] S1. Weigh raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After pumping to a vacuum degree of 5×10 - 3 Pa, and then fill it with argon to 500 Pa. Under the argon protection atmosphere, induction melting is carried out at a temperature of 1580 °C and a holding time of 25 min, and then casting is carried out to obtain an alloy ingot.

[0117] S2. The alloy ingot in step S1 is forged. The initial forging temperature is 1200 °C, the final forging temperature is 950 °C, and it is water-cooled after forging to obtain a slab.

[0118] S3. The slab in step S2 is hot-rolled. The starting temperature is 1100 °C, the final rolling temperature is 900 °C, and the total reduction ratio ≥70%. After hot rolling, it is air-cooled or water-cooled to room temperature.

[0119] S4. Solution treatment is carried out on the slab after hot rolling in step S3, keeping it at a temperature of 1000 °C for 3 h, followed by water quenching after solution treatment; then aging treatment is carried out, keeping it at a temperature of 270 °C for 1.5 h, then at a temperature of 370 °C for 1.5 h, and finally at a temperature of 420 °C for 2.5 h, and cooling to room temperature in the furnace to obtain a heat-treated slab;

[0120] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and small reduction ratios, with a total deformation of 20%, and then annealing treatment is carried out. The annealing temperature is 650 °C, the holding time is 1.5 h, and after annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0121] Compared with Example 1, in this comparative example, single-stage solution temperature is used for solution treatment.

[0122] Comparative Example 6

[0123] A high-damping Fe-Mn-based alloy material, the components of the alloy and the mass fraction of each component are as follows:

[0124] Mn 17.3%, doped metal 0.7%, TiB2 0.025%, C 0.011%, Si 0.016%, Fe balance; the doped metal is composed of Ni, Zr, and Mo with a mass ratio of 7:2.5:1.5.

[0125] A preparation method of a high-damping Fe-Mn-based alloy material, comprising the following steps:

[0126] S1. Weigh raw materials according to the above ratio, mix them and put them into a vacuum induction furnace. After evacuating to a vacuum degree of 5×10 - 3 Pa, and then filling with argon to 500 Pa. Under the argon protection atmosphere, induction melting is carried out at a temperature of 1580 °C, the holding time is 25 min, and casting is carried out to obtain an alloy ingot;

[0127] S2. Forge the alloy ingot in step S1, with the starting forging temperature of 1200 °C and the final forging temperature of 950 °C, and water-cool after forging to obtain a slab;

[0128] S3. Hot-roll the slab in step S2, with the starting temperature of 1100 °C and the final rolling temperature of 900 °C, and the total reduction ratio ≥70%. After hot rolling, air-cool or water-cool to room temperature;

[0129] S4. Solution treatment is carried out on the slab after hot rolling in step S3. First, it is held at a temperature of 880 °C for 1.5 h, then held at a temperature of 980 °C for 2.5 h, and then held at a temperature of 1080 °C for 1.5 h, followed by water quenching after solution treatment; then aging treatment is carried out, held at a temperature of 400 °C for 3 h, and cooled in the furnace to room temperature to obtain the heat-treated slab;

[0130] S5. The heat-treated slab in step S4 is cold-rolled with multiple passes and small reduction ratios, and the total deformation amount is 20%. Then annealing treatment is carried out. The annealing temperature is 650 °C and the holding time is 1.5 h. After annealing, it is air-cooled to obtain the high-damping Fe-Mn-based alloy material.

[0131] Compared with Example 1, in this comparative example, single-stage aging temperature is used for treatment during aging treatment.

[0132] The high-damping Fe-Mn-based alloy materials prepared in Examples 1-4 and Comparative Examples 1-4 are subjected to performance tests. Tensile properties are tested according to GB / T 228-2021 "Metallic materials - Tensile testing - Part 1: Method of test at room temperature", and tensile tests are carried out on a WE300B tensile testing machine. The specimen size is M16×φ10 mm, and 3 parallel specimens are taken for each group to test the tensile strength R m and yield strength R p0.2 ; Impact properties are tested according to GB / T 229-2020 "Metallic materials - Charpy pendulum impact test method", and Charpy V-notch impact tests are carried out on a JBN-300 impact testing machine. The specimen size is 10 mm×10 mm×55 mm, and V-notch specimens are used. The grooving position is the cross-section, and the notch depth is 2 mm. 3 parallel specimens are taken for each group to test the low-temperature impact energy of the material, and the cross-sectional fiber ratio and side expansion data of the fracture surface are statistically analyzed. The higher the cross-sectional shrinkage rate, the greater the plastic deformation experienced by the material before fracture and the more energy it can absorb, so the better the toughness. The larger the side expansion value, the more tortuous the crack propagation path during the impact fracture process of the material and the more energy it absorbs, so the better the toughness; Damping properties, the specimen size is 60 mm×8 mm×1.5 mm, taken from cross-sectional specimens, and a dynamic mechanical analyzer (DMA) is used to test the damping properties of the test materials. 3 parallel specimens are taken for each group, and a double-cantilever test mode is adopted to test the loss tangent Tanδ values of the materials under room temperature environment (25 °C) and different frequencies (50 Hz, 100 Hz) conditions respectively, and the damping properties of the materials are analyzed. The larger this value, the better the damping properties of the materials. The test results are shown in Table 1 below:

[0133] Table 1 Performance test results of Fe-Mn-based alloy materials in different examples and comparative examples

[0134]

[0135]

[0136] From Figure 1 The fracture morphology observation in [the above] shows that the microscopic fracture morphology consists of equiaxed dimples of different sizes, indicating that the material is actually ductile fracture. Therefore, the material has high low-temperature toughness.

[0137] As can be seen from Table 1 above, the Fe-Mn based alloy material prepared by the present invention has good damping performance, and at the same time has high strength and toughness, with excellent comprehensive properties and good application prospects.

[0138] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-damping Fe-Mn-based alloy material, characterized in that, The components of the alloy and the mass fraction of each component are as follows: Mn 16.5 - 17.5%, doped metal 0.5 - 0.8%, TiB2 0.02 - 0.03%, C 0.01 - 0.015%, Si 0.015 - 0.02%, and the balance is Fe.

2. The high-damping Fe-Mn-based alloy material according to claim 1, characterized in that, The components of the alloy and the mass fraction of each component are as follows: Mn 17 - 17.5%, doped metal 0.6 - 0.7%, TiB2 0.02 - 0.025%, C 0.012 - 0.015%, Si 0.015 - 0.018%, and the balance is Fe.

3. The high-damping Fe-Mn-based alloy material according to claim 1, wherein The doped metal is composed of Ni, Zr, and Mo, and the mass ratio of the three is 6 - 8:2 - 3:1 - 2.

4. The high-damping Fe-Mn-based alloy material according to claim 3, wherein The doped metal is composed of Ni, Zr, and Mo, and the mass ratio of the three is 7:2.5:1.

5.

5. A method for preparing a high-damping Fe-Mn-based alloy material according to any one of claims 1-4, characterized in that, It includes the following steps: S1. Weigh the raw materials according to the ratio, mix them and put them into a vacuum induction furnace. After evacuating the air, under the protection of argon gas atmosphere, carry out induction melting and casting to obtain an alloy ingot. S2. Forge the alloy ingot in step S1 to obtain a slab. S3. Hot-roll the slab in step S2, and cool it to room temperature after hot-rolling. S4. Carry out solution treatment and aging treatment on the slab hot-rolled in step S3 to obtain a heat-treated slab. S5. Carry out cold-rolling treatment and annealing treatment on the heat-treated slab in step S4, and then the high-damping Fe-Mn series alloy material is obtained.

6. The preparation method according to claim 3, characterized in that, The vacuum degree of the vacuum induction furnace described in step S1 is 5×10 -3 Pa; the temperature of the induction melting is 1550-1600 °C, and the heat preservation time is 20-30 min.

7. The preparation method according to claim 3, characterized in that, In step S2, the starting forging temperature of the forging is 1150 - 1200°C, the final forging temperature is 900 - 950°C, and water cooling is carried out after forging.

8. The preparation method according to claim 3, characterized in that, In step S3, the starting temperature of the hot-rolling is 1050 - 1150°C, the final rolling temperature is 850 - 900°C, the total reduction ratio ≥ 70%, and air cooling or water cooling is carried out after hot-rolling.

9. The preparation method according to claim 3, characterized in that, The solution treatment in step S4 is as follows: First, keep it at a temperature of 850 - 900°C for 1 - 2 h, then keep it at a temperature of 950 - 1000°C for 2 - 3 h, and then keep it at a temperature of 1050 - 1100°C for 1 - 2 h, and water quench after solution treatment; the aging treatment is as follows: Keep it at a temperature of 250 - 300°C for 1 - 2 h, then keep it at a temperature of 350 - 400°C for 1 - 2 h, and finally keep it at a temperature of 400 - 450°C for 2 - 3 h, and cool it to room temperature in the furnace.

10. The preparation method according to claim 3, characterized in that, In step S5, the total deformation amount of the cold-rolling treatment is 15% - 25%, and cold-rolling is carried out with multiple passes of small reduction amounts; the temperature of the annealing treatment is 600 - 700°C, the holding time is 1 - 2 h, and air cooling is carried out after annealing.

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