Manganese-copper damping alloy heat treatment method

Abstract

The invention discloses a manganese-copper damping alloy heat treatment method, and relates to the technical field of heat treatment of metal materials. A manganese-copper damping alloy heat treatment method comprises the following steps that a heat treatment furnace is subjected to purging vacuum, a forged manganese-copper damping alloy is put in the heat treatment furnace, and argon is used for purging; introducing heat treatment gas into the heat treatment furnace and pressurizing; and heating to 700-950 DEG C in a heat treatment gas atmosphere, carrying out heat treatment, and discharging. According to the method, vacuum purging and argon blowing are performed on the heat treatment furnace firstly, so that an inert gas environment can be provided for the manganese-copper damping alloy, alloy oxidation is prevented, the subsequent heat treatment process is stabilized, some volatile components in the alloy are protected, interference of environmental factors on heat treatment is reduced, then heat treatment gas is introduced and pressurization is performed, and the heat treatment efficiency is improved. The obtained manganese-copper damping alloy is excellent in damping performance and mechanical performance, and coordinated optimization of the mechanical performance and the damping performance of the manganese-copper damping alloy is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment of metal materials, and in particular to a heat treatment method for a manganese-copper damping alloy. Background Art

[0002] Manganese-copper damping alloy, especially when it is designed as a high damping alloy, is a special type of material. The characteristics of this alloy make it very valuable in applications that require vibration reduction and control. It is often used in electrical instruments, precision machinery, and building bridges. The development and application of manganese-copper damping alloys show how materials science can meet specific engineering and industrial needs by precisely adjusting the alloy composition and processing technology, especially in situations where there are strict requirements for vibration control. As an important vibration reduction material, manganese-copper damping alloy is unique in its high damping performance, which is mainly due to the specific ratio of manganese (Mn) to copper (Cu) in the alloy, and is optimized by adding alloying elements such as iron (Fe), aluminum (Al), and nickel (Ni). The Mn content of this type of alloy is usually not less than 70wt%, and the Cu content is at least 20wt%. Such chemical composition prompts the alloy to form a special twin structure, especially a thermoelastic martensitic structure, whose internal substructure is twins. When subjected to external forces, this unstable organizational structure can consume energy through the movement of the phase interface and the rearrangement of the twin structure, thereby exhibiting a significant damping effect.

[0003] The development history of manganese-copper damping alloys shows its gradual advancement from theoretical research to commercial application. The preparation process of the alloy mainly includes casting and forging processes, and can also be obtained by additive manufacturing. The subsequent heat treatment step is particularly critical, which not only affects the microstructure of the alloy, but also directly determines the mechanical properties and damping properties of the material. As an important means of material modification, the selection of temperature, time and cooling rate of heat treatment is crucial to the performance of the final alloy.

[0004] However, traditional heat treatment methods are often difficult to optimize the mechanical properties and damping properties of the alloy at the same time, and there is a certain balance problem between the two. In practical applications, in order to maximize the damping performance, some mechanical properties may often be sacrificed, and vice versa. For example, a heat treatment method for a forged manganese-copper vibration damping alloy disclosed in CN 110106458 A puts the manganese-copper alloy back into a heat treatment furnace after quenching, heats it to 200-300°C, keeps it warm for 1-2h, and then cools it in the furnace. Although the damping properties of the manganese-copper alloy can be improved by the above-mentioned heat treatment, there is still a problem of poor mechanical properties. Therefore, it is an urgent need in the industry to develop a heat treatment method that can effectively coordinate and strengthen these two properties. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing heat treatment methods cannot ensure that both damping performance and mechanical properties are achieved simultaneously. The purpose is to provide a heat treatment method for a manganese-copper damping alloy, which solves the problem that both damping performance and mechanical properties cannot be achieved simultaneously, and achieves that the manganese-copper damping alloy significantly improves its damping capacity while maintaining good mechanical properties.

[0006] The present invention is achieved through the following technical solutions:

[0007] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0008] Put the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge it with argon gas, and then evacuate it;

[0009] Introducing heat treatment gas into the heat treatment furnace and pressurizing it;

[0010] In a heat treatment gas atmosphere, the temperature is raised to 700-950°C for heat treatment and then taken out of the furnace.

[0011] As a possible design, the argon purge time is 15 to 30 minutes.

[0012] As a possible design, the heat treatment gas includes 30-100% by volume of hydrogen, with the remainder being argon.

[0013] As a possible design, the pressure in the heat treatment furnace is 0.01-0.03 MPa.

[0014] As a possible design, the heat treatment gas introduced into the heat treatment furnace is specifically introduced into the heat treatment furnace by introducing a mixture of hydrogen and argon into the heat treatment furnace to a desired pressure and adjusting the flow rate to 0.8 to 1.2 m / s. 3 / h.

[0015] As a possible design, the above heat treatment includes low temperature heating treatment, high temperature heating treatment and cooling treatment.

[0016] As a possible design, the low temperature heating treatment is specifically to heat up to 690-710°C at a rate of 8-12°C / min, keep warm for 20-40min, and the gas flow rate is 0.8-1.2m 3 / h.

[0017] As a possible design, the high temperature heating treatment is specifically to heat the low temperature heating treatment temperature to 800-950°C at a rate of 8-12°C / min, keep the temperature for 115-125min, and the gas flow rate is 0.8-1.2m 3 / h.

[0018] As a possible design, the above-mentioned cooling treatment is specifically to introduce argon when the temperature is cooled from the high-temperature heating treatment temperature to a temperature below 200°C, stop introducing hydrogen, and take the product out of the furnace when the temperature drops to below 100°C.

[0019] As a possible design, the forged manganese-copper damping alloy is also subjected to rough processing before being placed in the heat treatment furnace.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] The present invention provides an inert gas environment for the manganese-copper damping alloy by first purging the vacuum and blowing in argon gas into the heat treatment furnace, thereby preventing the alloy from being oxidized, stabilizing the subsequent heat treatment process, protecting some volatile components in the alloy, and reducing the interference of environmental factors on the heat treatment. Then, the heat treatment gas is introduced and pressurized, and the temperature is raised to a high temperature for heat treatment, so that the damping performance and mechanical properties of the obtained manganese-copper damping alloy are equally excellent, thereby achieving coordinated optimization of the mechanical properties and damping performance of the manganese-copper damping alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is a heat treatment temperature-time diagram of Example 1 of a heat treatment method for a manganese-copper damping alloy of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with examples and drawings. The illustrative embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0025] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The "range" disclosed in the present invention is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present invention, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, wherein a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] If not otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution. If not otherwise specified, all technical features and optional technical features of the present invention can be combined with each other to form a new technical solution. If not otherwise specified, all steps of the present invention can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0028] If there is no special explanation, the "include" and "comprising" mentioned in the present invention represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0029] If not specifically stated, in the present invention, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0030] It is often difficult to optimize the mechanical properties and damping properties of alloys based on traditional heat treatment methods, so that the damping properties and mechanical properties of manganese-copper damping alloys are always sacrificed and the performance optimization cannot be achieved. The present invention proposes a heat treatment method, which ensures the best damping performance and excellent mechanical properties by performing gradient heat treatment under a specific gas atmosphere.

[0031] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0032] S0. The forged manganese-copper damping alloy profile is subjected to rough processing to a size that can be heat treated.

[0033] S1. Put the prepared manganese-copper damping alloy rough billet into the heat treatment furnace, purge it with argon gas, and then evacuate it.

[0034] In some embodiments of the present invention, the argon purge time is 15 to 30 minutes. Through argon purge, other gases (such as oxygen, nitrogen) and moisture can be discharged, oxygen can be effectively isolated, and the metal is prevented from reacting with oxygen in the air during subsequent high-temperature heat treatment to avoid the formation of an oxide film, thereby ensuring that the surface quality of the alloy will not be reduced, and the internal structure and performance of the alloy will not be affected; it can also provide more uniform and stable heating conditions, reduce local temperature changes caused by air flow or oxygen intervention during heat treatment, and ensure the uniformity of alloy composition and the consistency of heat treatment effect; for alloys containing volatile elements, such as aluminum, titanium, etc., the argon environment can prevent these elements from volatilizing at high temperatures and maintain the predetermined chemical composition of the alloy; in addition, by using argon protection, defects such as pores and cracks in the heat treatment process can be significantly reduced, thereby improving the overall quality and reliability of alloy products.

[0035] Preferably, argon gas is used for purging, specifically to purge the air in the tail gas pipeline and the tail gas scrubbing tank, and to confirm that the bubbles in the tail gas scrubbing tank are continuous and stable.

[0036] S2. Introduce heat treatment gas into the heat treatment furnace and pressurize it.

[0037] In some embodiments of the present invention, the heat treatment gas comprises 30-100% by volume of hydrogen, with the remainder being argon.

[0038] In some embodiments of the present invention, the pressure in the heat treatment furnace is 0.01-0.03 MPa.

[0039] Preferably, the pressure in the heat treatment furnace is 0.02 MPa.

[0040] Under this gas pressure, first, it can help improve the airtightness inside the heat treatment furnace, reduce the infiltration of external air, ensure the purity of the gas environment, and thus more effectively prevent alloy oxidation; second, it can help the heat treatment gas to be evenly distributed in the heat treatment furnace, and improve the temperature uniformity during heat treatment, which is especially important for alloys that require precise control of heat treatment conditions, and helps to improve the overall treatment effect and consistency of material properties; third, under pressure, the density of the gas increases, which can accelerate the movement of gas molecules, which theoretically helps the transfer of heat energy and helps the heat treatment process to proceed efficiently.

[0041] In some embodiments of the present invention, the heat treatment gas is introduced into the heat treatment furnace by introducing a mixture of hydrogen and argon into the heat treatment furnace to a desired pressure, stopping the introduction of argon, and adjusting the gas flow rate to 0.8-1.2 m / s. 3 / h.

[0042] Preferably, when the introduction of argon is stopped, it is necessary to confirm that the bubbles in the tail gas scrubbing tank are continuous and stable.

[0043] S3. In a heat treatment gas atmosphere, the temperature is raised to 700-950°C for heat treatment and then taken out of the furnace.

[0044] The inventors found, based on the binary phase diagram of manganese-copper damping alloys, that heat treatment at 700-950°C can improve the damping performance and mechanical properties of manganese-copper damping alloys, thereby solving the problem of the alloy material being too hard and having poor plasticity and toughness after conventional heat treatment, and achieving a balanced improvement in the performance of manganese-copper damping alloys.

[0045] In some embodiments of the present invention, the heat treatment includes low temperature heating treatment, high temperature heating treatment and cooling treatment.

[0046] In some embodiments of the present invention, the low temperature heating treatment is specifically to heat the temperature to 690-710°C at a rate of 8-12°C / min, keep the temperature for 20-40min, and the gas flow rate is 0.8-1.2m 3 / h.

[0047] In some embodiments of the present invention, the high temperature heating treatment is specifically to heat the low temperature heating treatment temperature to 800-950°C at a rate of 8-12°C / min, keep the temperature for 115-125min, and the gas flow rate is 0.8-1.2m 3 / h.

[0048] In some embodiments of the present invention, the cooling treatment is specifically to cool down from the high temperature heating treatment temperature to a temperature below 200°C, introduce argon, stop introducing hydrogen, and take the product out of the furnace when the temperature drops to below 100°C.

[0049] The following examples were carried out using a ZG-160 / 2.5 vacuum sintering furnace.

[0050] Example 1

[0051] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0052] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0053] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 15 minutes, and then evacuate the furnace;

[0054] S2. Heat treatment gas (30% by volume hydrogen, the remainder argon) is introduced into the heat treatment furnace and pressurized to 0.01 MPa. The gas flow rate is adjusted to 0.8 m 3 / h;

[0055] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0056] Low temperature heating treatment: heating to 690℃ at a rate of 8℃ / min, keeping warm for 20min, gas flow rate of 0.8m 3 / h;

[0057] High temperature heating treatment: from the low temperature heating treatment temperature to 800℃ at a rate of 8℃ / min, keep warm for 115min, gas flow rate is 0.8m 3 / h;

[0058] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0059] Example 2

[0060] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0061] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0062] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0063] S2. Heat treatment gas (50% hydrogen by volume, the remainder argon) is introduced into the heat treatment furnace and pressurized to 0.02 MPa. The gas flow rate is adjusted to 1 m 3 / h;

[0064] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0065] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping warm for 30min, gas flow rate of 1m 3 / h;

[0066] High temperature heating treatment: from the low temperature heating treatment temperature to 850℃ at a rate of 10℃ / min, keep warm for 120min, gas flow rate is 1m 3 / h;

[0067] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0068] Example 3

[0069] This embodiment is basically the same as Embodiment 2, except that the heat treatment gas is pure hydrogen.

[0070] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0071] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0072] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0073] S2. Introduce heat treatment gas (hydrogen) into the heat treatment furnace and pressurize it to 0.02MPa, and adjust the gas flow rate to 1m 3 / h;

[0074] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0075] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping warm for 30min, hydrogen flow rate of 1m 3 / h;

[0076] High temperature heating treatment: from the low temperature heating treatment temperature to 850℃ at a rate of 10℃ / min, keep warm for 120min, and the hydrogen flow rate is 1m 3 / h;

[0077] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0078] Example 4

[0079] This embodiment is basically the same as Embodiment 2, except that the heat treatment gas is pure hydrogen and the heat treatment temperature is 875°C.

[0080] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0081] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0082] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0083] S2. Introduce heat treatment gas (hydrogen) into the heat treatment furnace and pressurize it to 0.02MPa. Adjust the hydrogen flow rate to 1m 3 / h;

[0084] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0085] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping warm for 30min, hydrogen flow rate of 1m 3 / h;

[0086] High temperature heating treatment: from the low temperature heating treatment temperature to 875℃ at a rate of 10℃ / min, keep warm for 120min, with a hydrogen flow rate of 1m 3 / h;

[0087] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0088] Example 5

[0089] This embodiment is basically the same as Embodiment 2, except that the temperature is raised to 900° C. during the high temperature heating treatment.

[0090] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0091] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0092] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0093] S2. Heat treatment gas (50% hydrogen by volume, the remainder argon) is introduced into the heat treatment furnace and pressurized to 0.02 MPa. The gas flow rate is adjusted to 1 m 3 / h;

[0094] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0095] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping warm for 30min, gas flow rate of 1m 3 / h;

[0096] High temperature heating treatment: from the low temperature heating treatment temperature to 900℃ at a rate of 10℃ / min, keep warm for 120min, gas flow rate is 1m 3 / h;

[0097] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0098] Example 6

[0099] This embodiment is basically the same as Embodiment 5, except that the heat treatment gas is pure hydrogen.

[0100] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0101] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0102] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0103] S2. Introduce heat treatment gas (hydrogen) into the heat treatment furnace and pressurize it to 0.02MPa. Adjust the hydrogen flow rate to 1m 3 / h;

[0104] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0105] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping warm for 30min, hydrogen flow rate of 1m 3 / h;

[0106] High temperature heating treatment: from the low temperature heating treatment temperature to 900℃ at a rate of 10℃ / min, keep warm for 120min, and the hydrogen flow rate is 1m 3 / h;

[0107] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0108] Example 7

[0109] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0110] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0111] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 35 minutes, and then evacuate the furnace;

[0112] S2. Heat treatment gas (60% by volume hydrogen, the remainder argon) is introduced into the heat treatment furnace and pressurized to 0.03 MPa. The gas flow rate is adjusted to 1.1 m 3 / h;

[0113] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0114] Low temperature heating treatment: heating to 700℃ at a rate of 11℃ / min, keeping temperature for 40min, gas flow rate of 1.2m 3 / h;

[0115] High temperature heating treatment: from the low temperature heating treatment temperature to 935℃ at a rate of 11℃ / min, keep warm for 123min, gas flow rate is 1.1m 3 / h;

[0116] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0117] Example 8

[0118] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0119] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0120] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 30 minutes, and then evacuate the furnace;

[0121] S2. Heat treatment gas (70% by volume hydrogen, the remainder argon) is introduced into the heat treatment furnace and pressurized to 0.03 MPa. The gas flow rate is adjusted to 1.2 m 3 / h;

[0122] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0123] Low temperature heating treatment: heating to 710℃ at a rate of 12℃ / min, keeping temperature for 40min, gas flow rate of 1.2m 3 / h;

[0124] High temperature heating treatment: from the low temperature heating treatment temperature to 950℃ at a rate of 12℃ / min, keep warm for 125min, gas flow rate is 1.2m 3 / h;

[0125] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0126] Comparative Example 1

[0127] This comparative example is basically the same as Example 2, except that the heat treatment gas is pure argon.

[0128] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0129] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0130] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0131] S2. Introduce heat treatment gas (argon) into the heat treatment furnace and pressurize it to 0.02MPa. Adjust the argon flow rate to 1m 3 / h;

[0132] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0133] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping temperature for 30min, argon flow rate of 1m 3 / h;

[0134] High temperature heating treatment: from the low temperature heating treatment temperature to 850℃ at a rate of 10℃ / min, keep warm for 120min, argon flow rate is 1m 3 / h;

[0135] Cooling treatment: Cool down from the high temperature heating treatment temperature to a temperature below 200°C, and take out of the furnace when the temperature drops to below 100°C.

[0136] Comparative Example 2

[0137] This comparative example is basically the same as Example 2, except that the pressure in step S2 is normal pressure.

[0138] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0139] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0140] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0141] S2. Introduce heat treatment gas (50% hydrogen by volume, the remainder argon) into the heat treatment furnace and adjust the gas flow rate to 1m 3 / h;

[0142] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0143] Low temperature heating treatment: heating to 700℃ at a rate of 10℃ / min, keeping warm for 30min, gas flow rate of 1m 3 / h;

[0144] High temperature heating treatment: from the low temperature heating treatment temperature to 850℃ at a rate of 10℃ / min, keep warm for 120min, gas flow rate is 1m 3 / h;

[0145] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0146] Comparative Example 3

[0147] This comparative example is basically the same as Example 2, except that the heat treatment temperature is 300°C.

[0148] A heat treatment method for a manganese-copper damping alloy comprises the following steps:

[0149] S0, rough machining the forged manganese-copper damping alloy to a size that can be heat treated;

[0150] S1. Place the prepared manganese-copper damping alloy rough blank into the heat treatment furnace, purge the heat treatment furnace with argon for 20 minutes, and then evacuate the furnace;

[0151] S2. Heat treatment gas (50% hydrogen by volume, the remainder argon) is introduced into the heat treatment furnace and pressurized to 0.02 MPa. The gas flow rate is adjusted to 1 m 3 / h;

[0152] S3, in a heat treatment gas atmosphere, sequentially undergoing a low temperature heating treatment, a high temperature heating treatment and a cooling treatment;

[0153] Low temperature heating treatment: heating to 100℃ at a rate of 10℃ / min, keeping warm for 30min, gas flow rate of 1m 3 / h;

[0154] High temperature heating treatment: from the low temperature heating treatment temperature to 300℃ at a rate of 10℃ / min, keep warm for 120min, gas flow rate is 1m 3 / h;

[0155] Cooling treatment: When the temperature is cooled from the high temperature heating treatment temperature to below 200°C, argon is introduced, the introduction of hydrogen is stopped, and when the temperature drops to below 100°C, it is taken out of the furnace.

[0156] Experimental example

[0157] (I) Damping performance test

[0158] The damping test specimens were taken from the center of the heat-treated samples of Examples 2 to 6 and Comparative Example 1. The specimen size was 50 mm × 1.8 mm × 1 mm, and the surface roughness was not greater than 1.6 μm. The damping performance test at room temperature was carried out in accordance with GB / T 13665 "Metallic Damping Material Damping Capacity Test Method Torsion Pendulum Method and Bending Vibration Method" to obtain the damping loss coefficient tanδ. The test frequencies were 1 Hz, 5 Hz, 10 Hz, 15 Hz, and 20 Hz, and the amplitude was 5 × 10 -5 The results are shown in Table 1.

[0159] Table 1

[0160] sample Atmosphere conditions tanδ Example 2 50% hydrogen + 50% argon, 850℃ insulation 0.051 Example 3 Pure hydrogen, 850℃ insulation 0.059 Example 4 Pure hydrogen, 875℃ insulation 0.058 Example 5 50% hydrogen + 50% argon, 900℃ insulation 0.067 Example 6 Pure hydrogen, 900℃ insulation 0.055 Comparative Example 1 Pure argon, 850℃ insulation 0.049

[0161] Damping performance SDC = 2π*tanδ, so the damping performance difference can be known with the help of the damping loss coefficient. As can be seen from Table 1, the damping performance of Example 5 is the best. As can be seen from the above table, the damping performance of the manganese-copper damping alloy can be maximized by keeping the temperature at 900°C and combining the heat treatment atmosphere of hydrogen and argon.

[0162] (II) Mechanical properties test

[0163] Take damping test specimens from the center of the samples after heat treatment of Examples 2 to 6 and Comparative Examples 1 to 3. The specimen size is 50 mm × 1.8 mm × 1 mm, and the surface roughness should be no greater than 1.6 μm. Mechanical properties are tested on a WDW-100C universal testing machine, and the equipment parameters are shown in the figure. According to the provisions of GB / T 228.1 "Metallic Material Tensile Test Part 1: Room Temperature Test Method", the room temperature tensile performance test is carried out, and the test is carried out at a speed of 0.5 mm / min in the first stage and 5 mm / min in the second stage, and the data results of Rm (tensile strength) and Rp0.2 (yield strength) are obtained, and the results are shown in Table 2.

[0164] Table 2

[0165] sample Rm / MPa Rp0.2 / MPa Example 2 495 235 Example 3 491 230 Example 4 490 231 Example 5 490 232 Example 6 485 230 Comparative Example 1 498 240 Comparative Example 3 480 220

[0166] From Table 2, it can be seen that Example 5 has the best comprehensive performance, which indicates that the manganese-copper damping alloy obtained by heat treatment under 50% hydrogen + 50% argon and 900°C insulation conditions has the best mechanical properties.

[0167] Combining Table 1 and Table 2, it can be seen that the heat treatment method of the present invention can take into account the comprehensive improvement of the damping performance and mechanical properties of the manganese-copper damping alloy, thereby optimizing the alloy performance.

[0168] The present invention provides an inert gas environment for the manganese-copper damping alloy by first purging the vacuum and blowing in argon gas into the heat treatment furnace, thereby preventing the alloy from being oxidized, stabilizing the subsequent heat treatment process, protecting some volatile components in the alloy, and reducing the interference of environmental factors on the heat treatment. Then, the heat treatment gas is introduced and pressurized, and the temperature is raised to a high temperature for heat treatment, so that the damping performance and mechanical properties of the obtained manganese-copper damping alloy are equally excellent, thereby achieving coordinated optimization of the mechanical properties and damping performance of the manganese-copper damping alloy.

[0169] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat treatment method for manganese-copper damping alloy, characterized in that: The steps include: The manganese-copper damping alloy is placed in a heat treatment furnace, and the heat treatment furnace is purged with argon gas and then evacuated; Introducing heat treatment gas into the heat treatment furnace and pressurizing it; In a heat treatment gas atmosphere, the temperature is raised to 700-950°C for heat treatment and then taken out of the furnace.

2. A heat treatment method for manganese-copper damping alloy according to claim 1, characterized in that: The argon purge time is 15 to 30 minutes.

3. A heat treatment method for manganese-copper damping alloy according to claim 1, characterized in that: The heat treatment gas includes 30-100% by volume of hydrogen, and the remainder is argon.

4. A heat treatment method for manganese-copper damping alloy according to claim 1, characterized in that: The pressure in the heat treatment furnace is 0.01-0.03 MPa.

5. A heat treatment method for manganese-copper damping alloy according to claim 1, characterized in that: The specific method of introducing the heat treatment gas into the heat treatment furnace is to introduce a mixed gas of hydrogen and argon into the heat treatment furnace to a desired pressure and adjust the flow rate to 0.8-1.2 m 3 / h.

6. A heat treatment method for manganese-copper damping alloy according to claim 1, characterized in that: The heat treatment includes low temperature heating treatment, high temperature heating treatment and cooling treatment.

7. A heat treatment method for manganese-copper damping alloy according to claim 6, characterized in that: The low temperature heating treatment is specifically to heat the temperature to 690-710°C at a rate of 8-12°C / min, keep the temperature for 20-40min, and the gas flow rate is 0.8-1.2m 3 / h.

8. A heat treatment method for manganese-copper damping alloy according to claim 6, characterized in that: The high temperature heating treatment is specifically to heat the low temperature heating treatment temperature to 800-950°C at a rate of 8-12°C / min, keep the temperature for 115-125min, and the gas flow rate is 0.8-1.2m 3 / h.

9. A heat treatment method for manganese-copper damping alloy according to claim 6, characterized in that: The cooling treatment specifically comprises cooling from the high temperature heating treatment temperature to a temperature lower than 200° C., introducing argon, stopping introducing hydrogen, and taking the product out of the furnace when the temperature drops to below 100° C.

10. A heat treatment method for manganese-copper damping alloy according to claim 1, characterized in that: The manganese-copper damping alloy is also subjected to rough processing before being placed in the heat treatment furnace.

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