A Fe-Mn-Al-Si lightweight corrosion-resistant damping steel and its manufacturing method

Abstract

This invention discloses a Fe-Mn-Al-Si lightweight corrosion-resistant damping steel and its manufacturing method, belonging to the field of damping alloy technology. The damping steel, by weight percentage, has the following alloy composition: C: 0.005-0.3%, Mn: 12-30%, Al: 3-12%, Si: 0.2-0.6%, Ni: 0.25-1.2%, Cu: 0.15-1.0%, P: ≤0.015%, S: ≤0.01%, with the balance being Fe and unavoidable trace impurities. The damping steel of this invention exhibits nearly three times the corrosion resistance of traditional 17Mn damping steel, and its density is reduced by 1%-10% compared to traditional iron-manganese damping steel. Furthermore, it ensures good strength and toughness: yield strength ≥300MPa, tensile strength ≥500MPa, elongation after fracture ≥40%, and impact absorption energy at -40℃ ≥250J.

Description

Technical Field

[0001] This invention relates to a Fe-Mn-Al-Si lightweight corrosion-resistant damping steel and its manufacturing method, belonging to the field of damping alloy technology. Background Technology

[0002] With the rapid development of modern industry, the requirements for equipment and components in fields such as transportation, energy, construction, aerospace, and military are becoming increasingly stringent. Equipment must maintain high strength under high-speed, heavy-load conditions while simultaneously exhibiting low wear and long lifespan. Vibration (especially resonance) and noise generated during equipment operation severely impact equipment lifespan, reducing its precision and reliability. Furthermore, noise not only pollutes the environment but also harms human health. Therefore, vibration and noise levels have become crucial factors determining product value and market competitiveness, and reducing vibration and noise has gradually attracted widespread attention across various sectors.

[0003] Among various damping alloys, damping steel possesses advantages such as a wide damping temperature range, excellent damping performance, good mechanical properties, and good weldability, giving it broad development prospects and a wide range of applications. The Fe-Mn series, as a novel damping alloy, boasts a tensile strength of up to 700 MPa and a specific damping capacity of approximately 20%-40%, exhibiting the best comprehensive performance among current iron-based damping steels. It is highly valuable for use in large components subjected to significant vibration and impact. However, with increasingly stringent requirements for larger, greener, and longer-life equipment, the heavy weight and poor corrosion resistance of Fe-Mn damping steel have become key factors restricting its rapid development and application. Therefore, developing Fe-Mn damping steel that combines high strength, toughness, lightweight, and corrosion resistance is of significant practical importance for achieving the greening and long-life transformation of large-scale vibration and noise reduction equipment.

[0004] The publication number CN116334500A, titled "A High-Strength Fatigue-Resistant Elastic-Plastic Damping Steel and Its Manufacturing Method and Application," discloses a chemical composition with the following mass percentages: 30% < Mn ≤ 40%, 6.0% ≤ Al ≤ 11.0%, 0.6% ≤ C ≤ 1.2%, 0.6% < Si ≤ 3.0%, 1.0% < Cr ≤ 3.0%, Ti ≤ 1.0%, Nb ≤ 1.0%, V ≤ 1.0%, P ≤ 0.15%, S ≤ 0.03%, and N ≤ 0.03%. The steel is an elasto-plastic damping steel with a content of % Mn, the remainder being Fe and unavoidable impurity elements. The yield strength of the elasto-plastic damping steel described in this invention is >420MPa. Under cyclic tensile-compression loading conditions, when the strain amplitude, strain ratio and loading frequency are 1%, -1.0 and 0.1-0.2Hz, respectively, the room temperature fatigue life of the steel plate is >2000 cycles, showing good fatigue resistance. However, the Mn content of this damping steel exceeds 30%, which will greatly affect the corrosion resistance of the steel and limit its application in atmospheric environments.

[0005] The patent application CN113355603A, entitled "A High-Carbon Damping Steel with Integrated Structural and Functional Properties and Its Preparation Method," discloses a high-carbon damping steel with the following chemical composition by mass percentage: C ≥ 1.2%, Si: 1.5%-1.7%, Mn: 0.20%-0.22%, Ni: 2.15%-2.25%, Al: 0.25%-0.27%, and balance: Fe. This invention utilizes a reasonable heat treatment process, holding the rolled plate at 750℃-850℃ for a period of time followed by furnace cooling to graphitize the plate, thus obtaining the high-carbon damping steel. However, the graphite and the matrix exhibit significant differences in strength and elastic modulus. Under cyclic stress, viscous flow occurs at the interface to coordinate strain, thereby consuming energy and generating internal friction. However, its noise reduction performance still lags behind that of the Fe-Mn system. Furthermore, due to the low strength, hardness, and ductility of graphite, its mechanical properties are poor, making it unsuitable as a load-bearing component in large equipment.

[0006] The invention, published under the patent number CN115418577A, utilizes a composite additive of 1.0% ≤ Al + Cr ≤ 3.0% to improve the corrosion resistance of steel by smelting in a converter or electric furnace, continuous casting or casting, rolling, and heat treatment. However, the corrosion resistance of this damping alloy is far from meeting the requirements for long service life and green development of large equipment.

[0007] The patent application CN115522112A, entitled "A Lightweight, High-Strength, and Tough Multi-Principal Element Damping Alloy Material and Its Preparation Method," discloses a lightweight, high-strength, and tough multi-principal element damping alloy material and its preparation method. The raw material composition of the lightweight, high-strength, and tough multi-principal element damping alloy has the following mass percentages: Al: 1-5%, Co: 25-35%, Ni: 25-35%, with the balance being iron. This invention utilizes the cocktail effect of multi-principal element alloys to introduce solid solution strengthening and grain refinement strengthening into the alloy through the preparation process. Although the tensile strength exceeds 610 MPa and the elongation is around 35% at room temperature, the impact performance is very poor. Moreover, the process is complex and costly, which greatly limits its application in large-scale vibration reduction and noise reduction equipment.

[0008] The patent application CN116445762A, entitled "A Lightweight, High-Strength, Tough, and High-Damping Titanium Alloy and Its Preparation Method," discloses a lightweight, high-strength, tough, and high-damping titanium alloy and its preparation method. This invention achieves an optimal balance between the alloy's damping performance and mechanical properties by adding a certain amount of non-precious metals and the titanium alloy's β-phase stabilizing element Fe (2.5-6 wt.%) to the titanium alloy. While the titanium alloy is β-phase stable, it achieves an optimal balance between the alloy's damping performance and mechanical properties. Compared to Fe-Mn damping steel, although it has a lighter weight, its damping effect is inferior, its yield strength ratio is high, and its economic efficiency is poor, which is also not conducive to its widespread application. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a Fe-Mn-Al-Si lightweight corrosion-resistant damping steel and its manufacturing method. The damping steel of this invention achieves the goal of material lightweighting while ensuring the material's strength, toughness, corrosion resistance, and damping performance. Moreover, the process is simple and the cost is low, making it suitable for widespread application in large-scale vibration reduction and noise reduction equipment.

[0010] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0011] In a first aspect, the present invention provides a Fe-Mn-Al-Si series lightweight corrosion-resistant damping steel, the alloy composition of which, by weight percentage, is: C: 0.005-0.3%, Mn: 12-30%, Al: 3-12%, Si: 0.2-0.6%, Ni: 0.25-1.2%, Cu: 0.15-1.0%, P: ≤0.015%, S: ≤0.01%, with the balance being Fe and unavoidable trace impurity elements.

[0012] This invention does not specify any particular metal raw materials for the preparation of the Fe-Mn-Al-Si lightweight corrosion-resistant damping steel, as long as they meet the steel composition requirements in the technical solution.

[0013] Furthermore, the Fe-Mn-Al-Si series lightweight corrosion-resistant damping steel has a yield strength ≥300MPa, tensile strength ≥500MPa, elongation after fracture ≥40%, and impact absorption energy at -40℃ ≥250J.

[0014] Furthermore, the internal friction value of the Fe-Mn-Al-Si series lightweight corrosion-resistant damping steel is ≥0.08.

[0015] Furthermore, the metallographic structure of the Fe-Mn-Al-Si lightweight corrosion-resistant damping steel includes ε-martensite, austenite, and α'-martensite.

[0016] Secondly, the present invention provides a method for manufacturing Fe-Mn-Al-Si lightweight corrosion-resistant damping steel, the specific rolling and heat treatment steps being as follows:

[0017] (1) The rolling process is divided into high-temperature rolling and warm rolling; the high-temperature rolling temperature is 1000-1100℃, the reduction per rolling pass is 15-17%, 4-5 passes are rolled, the temperature after rolling is controlled at 940-980℃, and the temperature is air-cooled to 380-450℃ before warm rolling; the reduction per rolling pass is 25-28%, 6-7 passes are rolled, and the temperature is air-cooled to room temperature;

[0018] (2) After rolling, the steel plate is subjected to quenching and tempering heat treatment; the quenching temperature is 950-1050℃, and after holding for 1-2 hours, it is water-cooled to room temperature; the tempering heat treatment is 300-450℃, held for 0.5-1.5 hours, and then air-cooled to room temperature to obtain Fe-Mn-Al-Si series lightweight corrosion-resistant damping steel.

[0019] Furthermore, before rolling, the billet is held at 1150-1300℃ for 3-3.5 hours.

[0020] Furthermore, the billet is obtained by ingot casting or continuous casting after the metal raw materials have been smelted.

[0021] Furthermore, the metal raw material is smelted using vacuum consumable melting or electroslag remelting methods, and the smelting is repeated multiple times.

[0022] Beneficial effects:

[0023] The Fe-Mn-Al-Si lightweight corrosion-resistant damping steel of this invention exhibits nearly three times the corrosion resistance of traditional 17Mn damping steel, while its density is reduced by 1%-10% compared to traditional iron-manganese damping steel. Furthermore, it maintains good strength and toughness: yield strength ≥300MPa, tensile strength ≥500MPa, elongation after fracture ≥40%, and impact absorption energy at -40℃ ≥250J. The damping performance of the damping steel also remains at a high level, with an internal friction value ≥0.08.

[0024] In this invention, the addition of Al serves two purposes: firstly, it reduces the steel density, achieving a lightweight effect; secondly, during service, it promotes a dense and highly protective Al2O3-containing corrosion product layer on the steel surface, significantly improving the steel's corrosion resistance. However, the addition of Al will substantially increase the stacking fault energy of austenitic high-manganese steel, strongly inhibiting martensitic transformation and twinning, which is detrimental to damping performance. To ensure that it still possesses good damping performance, this invention utilizes a hot-rolling + warm-rolling process to promote the formation of a large number of twins in the damping steel microstructure, followed by a preferred heat treatment process to further refine the grains, utilizing the nanoscale κ-carbide generated during aging, with the chemical formula (Fe,Mn)3AlC x This invention enhances the driving force of dislocation slip, ensuring the steel maintains high strength and toughness while reducing stacking fault energy and guaranteeing good damping performance. Furthermore, the addition of Si facilitates more thorough deoxidation during steelmaking and allows Si to synergistically enhance the corrosion resistance of Al. Attached Figure Description

[0025] Figure 1 The image shows the metallographic structure of the Fe-Mn-Al-Si lightweight corrosion-resistant damping steel prepared in Example 2.

[0026] Figure 2This is a comparison chart showing the corrosion rates of the comparative example and Example 4 after immersion in 3.5% NaCl solution for 3, 7, and 14 days. Detailed Implementation

[0027] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below. It should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0029] The Fe-Mn-Al-Si series lightweight corrosion-resistant damping steel of the present invention has the following alloy composition by weight percentage: C: 0.005-0.3%, Mn: 12-30%, Al: 3-12%, Si: 0.2-0.6%, Ni: 0.25-1.2%, Cu: 0.15-1.0%, P: ≤0.015%, S: ≤0.01%, with the balance being Fe and unavoidable trace impurity elements.

[0030] The method for manufacturing Fe-Mn-Al-Si lightweight corrosion-resistant damping steel of the present invention includes: smelting metal raw materials by vacuum consumable melting or electroslag remelting and smelting multiple times, and obtaining a billet by die casting or continuous casting.

[0031] After the billet is held at 1150-1300℃ for 3 hours in a box-type resistance furnace, rolling begins. The rolling process is divided into high-temperature rolling and warm rolling. The high-temperature rolling temperature is 1000-1100℃, with a reduction of 15% per rolling pass, and 4 rolling passes. The temperature after hot rolling is controlled at 940-980℃. Warm rolling begins after air cooling to 380-450℃, with a reduction of 25% per rolling pass, and 6 rolling passes. After that, it is air cooled to room temperature.

[0032] After rolling, the steel plate needs to undergo quenching and tempering heat treatment. The quenching temperature is 950-1050℃, held for 1 hour, and then water-cooled to room temperature; the tempering heat treatment process is: held at 300-450℃ for 0.5-1.5 hours, and then air-cooled to room temperature to obtain Fe-Mn-Al-Si series lightweight corrosion-resistant damping steel.

[0033] Examples 1-9

[0034] Table 1 shows the chemical composition (by weight percentage) of the embodiments and comparative examples of the present invention. The comparative examples are Fe-Mn binary alloys, while the embodiments of the present invention are all Fe-Mn-Al ternary alloys, with variations in the Mn and Al alloy contents. Table 2 shows the rolling processes of the embodiments and comparative examples of the present invention. Table 3 is a summary table of the heat treatment processes of the embodiments and comparative examples of the present invention. Table 4 is a summary table of the performance of the embodiments and comparative examples of the present invention after corresponding heat treatments. As can be seen from the tables, the damping performance of the embodiments and comparative examples is not significantly different. The Fe-Mn-Al ternary alloys with different Mn and Al contents all exhibit better corrosion resistance than the Fe-Mn binary alloys. In the embodiments, the low-Mn, high-Al system steel has a significantly lower density, exhibiting superior comprehensive performance.

[0035] Table 1 lists the chemical composition and weight percentage of each embodiment and comparative example of the present invention.

[0036]

[0037] Table 2 Rolling processes of various embodiments and comparative examples of the present invention

[0038]

[0039]

[0040] Table 3 Heat treatment processes of various embodiments and comparative examples of the present invention.

[0041]

[0042] Table 4. Overall performance of each embodiment and comparative example of the present invention.

[0043]

[0044]

[0045] Note: The corrosion test is a 14-day weekly immersion test, with alternating wet and dry conditions for one cycle per hour. Each cycle has an immersion time of 20 minutes and a drying time of 40 minutes. The test medium is a 3.5% NaCl solution, and the temperature and humidity inside the test chamber are 35℃ and 90%, respectively.

[0046] Figure 1 The metallographic structure of the Fe-Mn-Al-Si lightweight corrosion-resistant damping steel prepared in Example 2 is mainly composed of ε-martensite, austenite and α'-martensite. Figure 2 The graph shows a comparison of the corrosion rates of the comparative example and Example 4 after immersion in 3.5% NaCl solution for 3, 7, and 14 days. It is clear from the graph that the corrosion rate of Example 4 is much lower than that of the comparative example, demonstrating excellent corrosion resistance.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Fe-Mn-Al-Si-based light corrosion-resistant damping steel, characterized by, The alloy components are as follows in percentage by weight: C: 0.005-0.3%, Mn: 12-30%, Al: 3-12%, Si: 0.2-0.6%, Ni: 0.25-1.2%, Cu: 0.15-1.0%, P: ≤0.015%, S: ≤0.01%, the balance being Fe and inevitable trace impurities; The manufacturing method of the Fe-Mn-Al-Si light corrosion-resistant damping steel comprises the following specific rolling and heat treatment steps: (1) The rolling process is divided into high-temperature rolling and warm rolling; the high-temperature opening rolling temperature is 1000-1100℃, the rolling reduction per pass is 15-17%, the rolling is performed for 4-5 passes, and the rolling temperature is controlled at 940-980℃, and then the warm rolling is performed after air cooling to 380-450℃; the warm rolling reduction per pass is 25-28%, and the warm rolling is performed for 6-7 passes, and then air cooling is performed to room temperature; (2) After rolling, the steel plate is subjected to quenching and tempering heat treatment; the quenching temperature is 950-1050℃, the steel plate is water cooled to room temperature after being kept at the temperature for 1-2h; the tempering heat treatment is performed at 300-450℃ for 0.5-1.5h, and then air cooling is performed to room temperature, thereby obtaining the Fe-Mn-Al-Si light corrosion-resistant damping steel.

2. The Fe-Mn-Al-Si based light corrosion-resistant damping steel according to claim 1, characterized in that, The yield strength of the Fe-Mn-Al-Si light corrosion-resistant damping steel is ≥300MPa, the tensile strength is ≥500MPa, the elongation after fracture is ≥40%, and the impact energy at -40℃ is ≥250J.

3. The Fe-Mn-Al-Si based light corrosion-resistant damping steel according to claim 1, characterized in that, The internal friction value of the Fe-Mn-Al-Si light corrosion-resistant damping steel is ≥0.

08.

4. The Fe-Mn-Al-Si based light corrosion-resistant damping steel according to claim 1, characterized in that, The metallographic structure of the Fe-Mn-Al-Si light corrosion-resistant damping steel comprises ε martensite, austenite and α' martensite.

5. The Fe-Mn-Al-Si based light corrosion-resistant damping steel according to claim 1, characterized in that, Before rolling, the cast blank is kept at 1150-1300℃ for 3-3.5h.

6. The Fe-Mn-Al-Si based light corrosion-resistant damping steel according to claim 5, characterized in that, The cast blank is obtained by adopting mold casting or continuous casting after melting the metal raw material.

7. The Fe-Mn-Al-Si based light corrosion-resistant damping steel according to claim 6, characterized in that, The melting of the metal raw material is performed by adopting the vacuum consumable melting or electroslag remelting method and multiple melting.

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